feat(pathfinding): non-eager TryGetMask + second-touch promotion (#2451)
## Summary Closes the Cold-cache regression flagged in PR #2450. `StepCache.TryGetMask` no longer eagerly runs `BuildChunk` on the first miss for a chunk that isn't in a `.swb` lazy reader. Instead it returns `Fallthrough_NotBuilt` and the caller (`BitmapAStarAlgorithm`) takes the per-cell slow path. The chunk is only promoted to the bitmap fast path after the **second** miss within a 30-second window, filtering single-touch pass-throughs. This makes BitmapAStar's worst-case (cold cache + short hops) collapse from **12–47× slower** than FastAStar to **roughly the same**, which is the floor the slow path can deliver. Steady-state warm performance (the actual deliverable) is unchanged from PR-5 — it was always the cache fast path. ## The pet-follow scenario this fixes A mounted player at ~4 tiles/sec with a pet/hireable following will trigger an NPC pathfind every 100–300 ms. Each pathfind is 1–6 tiles. As the player crosses chunk boundaries (~4 sec/chunk), the pet's first pathfind in the new chunk under the previous behavior triggered a full ~700 µs `BuildChunk` for a chunk the player would leave shortly after. At 50–100 mobiles per shard, this exceeded the 8 ms tick budget. PR-5 BDN data showed scenarios 6–9 (2–8 tile NPC perception) at 2,300–3,700 µs Cold vs FastAStar's 80–200 µs. Under the new gate: - First miss → `Fallthrough_NotBuilt` → caller uses slow path (~30–50 µs short path). No `BuildChunk`. No allocation. - Player keeps moving → chunk never gets a second touch within window → never promoted, no rot. - NPC patrolling a fixed territory → repeatedly hits the same chunks → second touch within window → promote → cache fast path on subsequent calls. ## What changed - **`CacheHitKind.Fallthrough_NotBuilt = 6`** + **`CacheStats.FallthroughNotBuilt`** counter. `IsHit=false`, so the caller routes to slow path. - **`StepCache._chunkMissTracker`** — `Dictionary<long, ChunkMissState>` capped at 4096 entries. State is `(byte missCount, uint lastMissTickStamp)` keyed by chunk key. Window-expired entries reset count to 1; capacity overflow prunes window-old entries first. - **`StepCache.MissPromotionThreshold`** (default `2`) and **`StepCache.MissPromotionWindowMs`** (default `30_000`) — tunable, can be wired through `ServerConfiguration` if shards want different policy. Setting threshold to `1` restores legacy eager-build behavior (used by tests that prime chunks via single `TryGetMask` call). - **`StepCache.TryGetMask` miss branch** — try lazy reader first (file-loaded chunks bypass the tracker entirely; an `.swb` represents an explicit prior decision to keep the chunk warm). Otherwise consult the tracker. - **`BitmapAStarAlgorithm.GetSuccessorsSlowPath`** now layers `IsBlockedByDynamic` on top of `CalcMoves.CheckMovement`. Previously the slow path only ran for `CanFly` creatures and rare cache fallthroughs — `CheckMovement` doesn't iterate same-cell mobiles, so the bitmap fast path's `IsBlockedByDynamic` was the only mobile-blocking check. Now first-touch pathfinds run through the slow path, so the gap had to close. ## Tests 50 pathfinding tests pass (was 47). New / updated: - **`TryGetMask_FirstTouchOnUnbuiltChunk_DefersBuildAndReturnsFallthrough`** — single TryGetMask call returns `Fallthrough_NotBuilt`, no chunk built, no allocation. - **`TryGetMask_SecondTouchWithinWindow_PromotesAndBuilds`** — second call inside the 30s window builds + serves. - **`TryGetMask_SecondTouchAfterWindow_RestartsCounterAndDefers`** — second call outside the window restarts the count, returns Fallthrough again. - **`TryGetMask_DistinctChunks_TrackedIndependently`** — counters are per-chunk; one touch on each of two adjacent chunks both stay in fallthrough. - **`LazyReaderHit_BypassesMissTrackerOnFirstTouch`** — open `.swb` + first touch hits without consulting the tracker. Production with `.swb` loaded skips the gate entirely. - **`MultisVersion_Bump_TriggersDirtyRebuild`** — updated to reflect the new 3-step flow (Fallthrough → Miss_NotBuilt → Miss_DirtyRebuild). - Tests that prime chunks via a single `TryGetMask` call (multi-Z, Tier4, lifecycle, parity, BitmapAStar uses-cache) set `MissPromotionThreshold = 1` to opt into eager behavior. ## Expected BDN impact The Cold column from PR-5's BDN should change as follows once the bench's submodule pointer is updated to this branch: | # | Scenario | Cold (PR-5) | Cold (PR-6 expected) | FastAStar Cold | |--:|-----------------|-------------:|---------------------:|---------------:| | 2 | sewer corridor | 1,627 µs | ~36 µs | 36 µs | | 4 | causeway | 1,533 µs | ~39 µs | 39 µs | | 6 | pet 2-tile | 2,364 µs | ~80 µs | 81 µs | | 8 | npc 5-tile | 3,708 µs | ~140 µs | 141 µs | | 9 | npc 8-tile | 2,386 µs | ~200 µs | 197 µs | WarmNoFile and LazyWarm rows should be unchanged — they were always cache-warm. The miss tracker only fires when neither resident chunks nor the lazy reader can satisfy the request. ## Future work (not in this PR) - **Background-thread bake**: builds outside the game thread so even promoted chunks don't pay the 700 µs build cost on the main thread. Rule 10 (no Task.Run) applies, so this needs careful design — the bake is a pure data transform but main-thread synchronization on chunk-state transitions has to be threaded through. Defer to a follow-up. - **Long-traverse BDN scenario**: a multi-Find benchmark simulating 50 pet repaths across chunk transitions. Requires restructuring the bench harness; the existing 10-scenario corpus + Cold provider already exercises the gate. - **Swim sourceZ bake**: scenario 5 (sea serpent) shows 56 B alloc on warm paths because the cache's SourceZ is computed under default-walker rules. Swim creatures fall through to slow path. Independent of this PR.
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Kamron Batman
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commit
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14 changed files with 1664 additions and 163 deletions
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@ -108,6 +108,12 @@ public class BitmapAStarAlgorithm : PathAlgorithm
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return null;
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}
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// Mark a new Find generation so the StepCache promotion gate counts THIS pathfind
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// as one touch per chunk regardless of how many times the expansion frontier
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// probes a given chunk. Without this, A* hits each visited chunk dozens of times
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// and trips the threshold immediately.
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StepCache.Instance.BeginFindGeneration();
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Server.Engines.Pathing.PathfindRecorder.RecordIfEnabled(m, map, start, goal);
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_currentMobileNeedsSlowPath = RequiresSlowPath(m);
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@ -494,6 +500,8 @@ public class BitmapAStarAlgorithm : PathAlgorithm
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/// <summary>
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/// Per-direction <see cref="CalcMoves.CheckMovement"/> loop for a single source cell.
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/// Runs on cache fallthrough or when <see cref="_currentMobileNeedsSlowPath"/> is set.
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/// CheckMovement validates land/statics/items via MovementImpl; dynamic mobile blocking
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/// is layered on top because MovementImpl doesn't iterate same-cell mobiles.
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/// </summary>
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private static int GetSuccessorsSlowPath(Mobile m, Map map, int px, int py, Point3D p3D, int[] vals)
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{
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@ -510,15 +518,23 @@ public class BitmapAStarAlgorithm : PathAlgorithm
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continue;
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}
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if (CalcMoves.CheckMovement(m, map, p3D, (Direction)i, out var z))
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if (!CalcMoves.CheckMovement(m, map, p3D, (Direction)i, out var z))
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{
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var idx = GetIndex(x + _xOffset, y + _yOffset, z);
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continue;
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}
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if (idx >= 0 && idx < NodeCount)
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{
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_nodes[idx].z = z;
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vals[count++] = idx;
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}
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var absX = x + _xOffset;
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var absY = y + _yOffset;
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if (IsBlockedByDynamic(m, map, absX, absY, z))
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{
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continue;
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}
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var idx = GetIndex(absX, absY, z);
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if (idx >= 0 && idx < NodeCount)
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{
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_nodes[idx].z = z;
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vals[count++] = idx;
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}
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}
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@ -3,7 +3,7 @@ namespace Server.Engines.Pathing.Cache;
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/// <summary>
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/// Outcome categories for StepCache.TryGetMask. Used for telemetry and to drive
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/// the slow-path fallthrough decision in callers. Ordering is load-bearing:
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/// values 0-2 are hits, values 3-5 are fallthroughs (see StepMask.IsHit).
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/// values 0-2 are hits, values 3-6 are fallthroughs (see StepMask.IsHit).
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/// </summary>
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public enum CacheHitKind : byte
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{
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@ -13,4 +13,5 @@ public enum CacheHitKind : byte
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Fallthrough_MultiZ = 3, // cell has multiple walkable surfaces; caller must use slow path
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Fallthrough_OffMap = 4, // out of bounds
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Fallthrough_SourceZMismatch = 5, // |loc.Z - BakedSourceZ| > StepHeight; cache answer would diverge
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Fallthrough_NotBuilt = 6, // first-touch miss without lazy file hit; build deferred until second touch
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}
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@ -12,6 +12,7 @@ public readonly struct CacheStats(
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long fallthroughMultiZ,
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long fallthroughOffMap,
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long fallthroughSourceZMismatch,
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long fallthroughNotBuilt,
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long evictionsByLruCap,
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long buildsTotal
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)
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@ -23,6 +24,7 @@ public readonly struct CacheStats(
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public readonly long FallthroughMultiZ = fallthroughMultiZ;
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public readonly long FallthroughOffMap = fallthroughOffMap;
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public readonly long FallthroughSourceZMismatch = fallthroughSourceZMismatch;
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public readonly long FallthroughNotBuilt = fallthroughNotBuilt;
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public readonly long EvictionsByLruCap = evictionsByLruCap;
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public readonly long BuildsTotal = buildsTotal;
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}
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@ -24,6 +24,29 @@ public sealed class StepCache
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// with _chunks: append on Miss_NotBuilt, swap-and-pop on eviction.
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private readonly List<long> _keysList = new();
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// Second-touch promotion tracker. A chunk's first miss within the window returns
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// Fallthrough_NotBuilt; the caller takes the slow path. The Nth DISTINCT-FIND miss
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// within the same window (where N = MissPromotionThreshold) promotes to BuildChunk +
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// serve. We count distinct Find generations, not raw TryGetMask calls — A* expansion
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// hits each visited chunk many times in one Find, so per-call counting hits threshold
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// immediately and defeats the gate. Per-Find counting filters single-Find pass-throughs
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// (pet following a moving player) while still promoting chunks revisited by multiple
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// Finds (NPC patrolling fixed territory).
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private readonly Dictionary<long, ChunkMissState> _chunkMissTracker = new();
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private const int MaxMissTrackerEntries = 4096;
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// Generation counter incremented by BeginFindGeneration(). Sentinel 0 = "no Find started
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// yet"; treated as a distinct generation per call so callers that bypass BeginFindGeneration
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// (single-call tests, BakeMap with threshold=1) get sensible behavior.
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private uint _findGeneration;
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private struct ChunkMissState
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{
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public byte MissCount;
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public uint LastMissTickStamp;
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public uint LastFindGeneration;
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}
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// Telemetry counters
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private long _hits;
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private long _missesNotBuilt;
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@ -31,6 +54,7 @@ public sealed class StepCache
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private long _fallthroughMultiZ;
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private long _fallthroughOffMap;
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private long _fallthroughSourceZMismatch;
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private long _fallthroughNotBuilt;
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private long _evictionsByLruCap;
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private long _buildsTotal;
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@ -39,6 +63,43 @@ public sealed class StepCache
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/// <summary>Hard cap on resident chunk count. Default 8192. Override for tests / ops.</summary>
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public int MaxResidentChunks { get; set; } = 8192;
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/// <summary>
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/// When true, <see cref="TryOpenLazyReader"/> immediately materializes every chunk in
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/// the .swb file into the resident set, paying the file-load cost upfront at boot
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/// instead of on first query. Trades ~25–50ms boot time per fully-baked map for zero
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/// first-touch latency in production. Default off — preserves the lazy memory profile.
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/// </summary>
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public bool PreloadOnLazyOpen { get; set; }
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/// <summary>
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/// Number of misses on the same chunk within <see cref="MissPromotionWindowMs"/>
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/// required to trigger a build. 1 = eager (legacy behavior). 2 = second-touch (default,
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/// filters single-touch pass-throughs).
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/// </summary>
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public int MissPromotionThreshold { get; set; } = 2;
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/// <summary>
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/// Window over which misses against the same chunk accumulate toward promotion.
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/// Misses spaced wider than this restart the count. Default 30s.
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/// </summary>
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public uint MissPromotionWindowMs { get; set; } = 30_000;
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/// <summary>
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/// Marks the start of a new pathfind. The promotion gate counts distinct Find
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/// generations per chunk, not raw TryGetMask calls — call this once at the top of
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/// each pathfind invocation so multiple cell expansions within one Find don't trip
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/// the threshold. Wraps at uint.MaxValue back to 1 (0 is reserved as the
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/// "no Find started yet" sentinel).
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/// </summary>
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public void BeginFindGeneration()
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{
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unchecked { _findGeneration++; }
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if (_findGeneration == 0) { _findGeneration = 1; }
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}
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/// <summary>Test-only: read the current Find generation.</summary>
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internal uint CurrentFindGeneration => _findGeneration;
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/// <summary>
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/// Pack (mapId, chunkX, chunkY) into a single long key.
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/// Layout: [reserved 16][mapId 16][chunkX 16][chunkY 16].
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@ -54,6 +115,7 @@ public sealed class StepCache
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fallthroughMultiZ: _fallthroughMultiZ,
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fallthroughOffMap: _fallthroughOffMap,
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fallthroughSourceZMismatch: _fallthroughSourceZMismatch,
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fallthroughNotBuilt: _fallthroughNotBuilt,
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evictionsByLruCap: _evictionsByLruCap,
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buildsTotal: _buildsTotal
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);
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@ -79,12 +141,15 @@ public sealed class StepCache
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{
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_chunks.Clear();
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_keysList.Clear();
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_chunkMissTracker.Clear();
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_findGeneration = 0;
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_hits = 0;
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_missesNotBuilt = 0;
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_missesDirtyRebuild = 0;
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_fallthroughMultiZ = 0;
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_fallthroughOffMap = 0;
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_fallthroughSourceZMismatch = 0;
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_fallthroughNotBuilt = 0;
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_evictionsByLruCap = 0;
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_buildsTotal = 0;
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}
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@ -123,18 +188,30 @@ public sealed class StepCache
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return 0;
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}
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var chunkCols = (map.Width + ChunkSize - 1) / ChunkSize;
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var chunkRows = (map.Height + ChunkSize - 1) / ChunkSize;
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for (var cy = 0; cy < chunkRows; cy++)
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// BakeMap is an explicit decision to populate every chunk; the promotion gate
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// would otherwise return Fallthrough_NotBuilt for every chunk (each touched once)
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// and the bake would write an empty file. Force eager build for the duration.
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var prevThreshold = MissPromotionThreshold;
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MissPromotionThreshold = 1;
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try
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{
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for (var cx = 0; cx < chunkCols; cx++)
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var chunkCols = (map.Width + ChunkSize - 1) / ChunkSize;
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var chunkRows = (map.Height + ChunkSize - 1) / ChunkSize;
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for (var cy = 0; cy < chunkRows; cy++)
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{
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// Any sourceZ works — the chunk is built on first access regardless of
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// whether the query returns Hit or Fallthrough_SourceZMismatch.
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TryGetMask(map, cx * ChunkSize, cy * ChunkSize, sourceZ: 0);
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for (var cx = 0; cx < chunkCols; cx++)
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{
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// Any sourceZ works — the chunk is built on first access regardless of
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// whether the query returns Hit or Fallthrough_SourceZMismatch.
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TryGetMask(map, cx * ChunkSize, cy * ChunkSize, sourceZ: 0);
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}
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}
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}
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finally
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{
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MissPromotionThreshold = prevThreshold;
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}
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return SaveToFile(path, mapId);
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}
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@ -213,9 +290,54 @@ public sealed class StepCache
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"StepCache: opened {Path} ({ChunkCount} chunks indexed) for map {MapId}",
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path, reader.IndexedChunkCount, mapId
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);
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if (PreloadOnLazyOpen)
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{
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PreloadFromLazyReader(mapId, reader);
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}
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return true;
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}
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/// <summary>
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/// Materializes every chunk in <paramref name="reader"/> into the resident set.
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/// Called from <see cref="TryOpenLazyReader"/> when <see cref="PreloadOnLazyOpen"/>
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/// is set. Skips chunks whose live <see cref="Map.Sector.MultisVersion"/> doesn't
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/// match the file's snapshot — those will rebake on first query.
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/// </summary>
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private void PreloadFromLazyReader(int mapId, StepCacheFile.LazyReader reader)
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{
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var map = Map.Maps[mapId];
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if (map == null || map == Map.Internal)
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{
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return;
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}
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var loaded = 0;
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foreach (var (chunkX, chunkY) in reader.EnumerateChunkCoords())
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{
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var key = EncodeKey(mapId, chunkX, chunkY);
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if (_chunks.ContainsKey(key))
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{
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continue;
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}
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var chunk = TryLoadFromLazyReader(map, chunkX, chunkY);
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if (chunk == null)
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{
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continue;
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}
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_chunks[key] = chunk;
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_keysList.Add(key);
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loaded++;
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}
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logger.Information(
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"StepCache: preloaded {Loaded} chunks from .swb for map {MapId}", loaded, mapId
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);
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}
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/// <summary>
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/// Number of .swb readers currently open. Mostly for tests / telemetry.
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/// </summary>
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@ -324,10 +446,27 @@ public sealed class StepCache
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var hitKindResult = CacheHitKind.Hit;
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if (!_chunks.TryGetValue(key, out var chunk))
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{
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chunk = ResolveMissingChunk(map, chunkX, chunkY);
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_chunks[key] = chunk;
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_keysList.Add(key);
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hitKindResult = CacheHitKind.Miss_NotBuilt;
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// Try lazy file first — file-loaded chunks bypass the miss tracker because
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// the .swb represents an explicit prior decision to keep this chunk warm.
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chunk = TryLoadFromLazyReader(map, chunkX, chunkY);
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if (chunk != null)
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{
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_chunks[key] = chunk;
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_keysList.Add(key);
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hitKindResult = CacheHitKind.Miss_NotBuilt;
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}
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else if (ShouldPromoteAfterMiss(key))
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{
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chunk = BuildChunk(map, chunkX, chunkY);
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_chunks[key] = chunk;
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_keysList.Add(key);
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hitKindResult = CacheHitKind.Miss_NotBuilt;
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}
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else
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{
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_fallthroughNotBuilt++;
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return new StepMask(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, CacheHitKind.Fallthrough_NotBuilt);
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}
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}
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else
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{
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@ -369,6 +508,37 @@ public sealed class StepCache
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// because tile reachability shifts at step-height boundaries.
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if (Math.Abs(sourceZ - chunk.SourceZ[cellIndex]) > StepHeight)
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{
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// Swim-layer fallback for shore cells: if the chunk has the layer and this
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// cell's water-surface Z is within StepHeight of the query, serve from the
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// swim layer (computed at swim-perspective Z). Walker queries on shore cells
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// fall through this branch via their Z mismatch with SwimSourceZ.
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if (chunk.HasSwimLayer)
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{
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var swimSrc = chunk.SwimSourceZ[cellIndex];
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if (swimSrc != StepChunk.NoSwimLayerCell && Math.Abs(sourceZ - swimSrc) <= StepHeight)
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{
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switch (hitKindResult)
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{
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case CacheHitKind.Miss_NotBuilt: { _missesNotBuilt++; break; }
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case CacheHitKind.Miss_DirtyRebuild: { _missesDirtyRebuild++; break; }
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case CacheHitKind.Hit: { _hits++; break; }
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}
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return new StepMask(
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0, chunk.SwimMask[cellIndex],
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0, 0, 0, 0, 0, 0, 0, 0,
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chunk.SwimZN_Layer[cellIndex],
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chunk.SwimZNE_Layer[cellIndex],
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chunk.SwimZE_Layer[cellIndex],
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chunk.SwimZSE_Layer[cellIndex],
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chunk.SwimZS_Layer[cellIndex],
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chunk.SwimZSW_Layer[cellIndex],
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chunk.SwimZW_Layer[cellIndex],
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chunk.SwimZNW_Layer[cellIndex],
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hitKindResult
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);
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}
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}
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_fallthroughSourceZMismatch++;
|
||||
return new StepMask(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, CacheHitKind.Fallthrough_SourceZMismatch);
|
||||
}
|
||||
|
|
@ -404,28 +574,128 @@ public sealed class StepCache
|
|||
}
|
||||
|
||||
/// <summary>
|
||||
/// Chunk-miss resolution: try the lazy file reader for this map first; if there's no
|
||||
/// file or no record at this (chunkX, chunkY), fall back to the runtime baker. The
|
||||
/// file path validates each loaded chunk's MultisVersion against the live sector — a
|
||||
/// stale snapshot triggers a rebuild rather than serving a wrong answer.
|
||||
/// Returns a fresh StepChunk loaded from the lazy file reader, or null if there's no
|
||||
/// open reader for the map / no record at (chunkX, chunkY) / the loaded snapshot is
|
||||
/// stale relative to the live sector's <see cref="Map.Sector.MultisVersion"/>. A null
|
||||
/// return means the caller should consult the miss tracker; a stale return means
|
||||
/// "rebuild, the .swb is out of date and a future SaveToFile will overwrite it."
|
||||
/// </summary>
|
||||
private StepChunk ResolveMissingChunk(Map map, int chunkX, int chunkY)
|
||||
private StepChunk TryLoadFromLazyReader(Map map, int chunkX, int chunkY)
|
||||
{
|
||||
if (_lazyReaders.TryGetValue(map.MapID, out var reader))
|
||||
if (!_lazyReaders.TryGetValue(map.MapID, out var reader))
|
||||
{
|
||||
var loaded = reader.TryReadChunk(chunkX, chunkY);
|
||||
if (loaded != null)
|
||||
return null;
|
||||
}
|
||||
var loaded = reader.TryReadChunk(chunkX, chunkY);
|
||||
if (loaded == null)
|
||||
{
|
||||
return null;
|
||||
}
|
||||
var sector = map.GetRealSector(chunkX, chunkY);
|
||||
return loaded.BuiltMultisVersion == sector.MultisVersion ? loaded : null;
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// Records a miss for <paramref name="chunkKey"/> and decides whether to build now
|
||||
/// or defer to slow path. Counts distinct Find generations, not raw calls — multiple
|
||||
/// TryGetMask calls within one Find (BeginFindGeneration scope) count as one touch.
|
||||
/// Returns true when DISTINCT-FIND misses within the window cross
|
||||
/// <see cref="MissPromotionThreshold"/>; caller should run BuildChunk and serve.
|
||||
/// Returns false otherwise; caller should return Fallthrough_NotBuilt so the algorithm
|
||||
/// uses the slow path. Generation 0 ("no Find active") treats every call as distinct,
|
||||
/// preserving legacy semantics for callers that don't call BeginFindGeneration.
|
||||
/// </summary>
|
||||
private bool ShouldPromoteAfterMiss(long chunkKey)
|
||||
{
|
||||
// Environment.TickCount, not Core.TickCount: tests/bench fixtures may not advance
|
||||
// the game-loop tick. The promotion window is wall-clock anyway.
|
||||
var now = (uint)Environment.TickCount;
|
||||
var gen = _findGeneration;
|
||||
|
||||
if (_chunkMissTracker.TryGetValue(chunkKey, out var state))
|
||||
{
|
||||
// Same Find generation as the last touch — A* expansion is probing this chunk
|
||||
// multiple times in one pathfind. Don't increment; the gate counts distinct
|
||||
// Finds. Skip when gen==0 (no Find started) so legacy single-call tests still
|
||||
// see incrementing behavior.
|
||||
if (gen != 0 && state.LastFindGeneration == gen)
|
||||
{
|
||||
var sector = map.GetRealSector(chunkX, chunkY);
|
||||
if (loaded.BuiltMultisVersion == sector.MultisVersion)
|
||||
return false;
|
||||
}
|
||||
|
||||
var elapsed = now - state.LastMissTickStamp;
|
||||
if (elapsed > MissPromotionWindowMs)
|
||||
{
|
||||
_chunkMissTracker[chunkKey] = new ChunkMissState
|
||||
{
|
||||
return loaded;
|
||||
}
|
||||
// Snapshot is stale (multis added/removed since the bake). Fall through
|
||||
// to the runtime baker; a future SaveToFile will overwrite the entry.
|
||||
MissCount = 1,
|
||||
LastMissTickStamp = now,
|
||||
LastFindGeneration = gen
|
||||
};
|
||||
return false;
|
||||
}
|
||||
|
||||
var newCount = (byte)Math.Min(state.MissCount + 1, byte.MaxValue);
|
||||
if (newCount >= MissPromotionThreshold)
|
||||
{
|
||||
_chunkMissTracker.Remove(chunkKey);
|
||||
return true;
|
||||
}
|
||||
|
||||
_chunkMissTracker[chunkKey] = new ChunkMissState
|
||||
{
|
||||
MissCount = newCount,
|
||||
LastMissTickStamp = now,
|
||||
LastFindGeneration = gen
|
||||
};
|
||||
return false;
|
||||
}
|
||||
|
||||
if (MissPromotionThreshold <= 1)
|
||||
{
|
||||
return true;
|
||||
}
|
||||
|
||||
if (_chunkMissTracker.Count >= MaxMissTrackerEntries)
|
||||
{
|
||||
PruneMissTracker(now);
|
||||
}
|
||||
|
||||
_chunkMissTracker[chunkKey] = new ChunkMissState
|
||||
{
|
||||
MissCount = 1,
|
||||
LastMissTickStamp = now,
|
||||
LastFindGeneration = gen
|
||||
};
|
||||
return false;
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// Drop tracker entries older than the promotion window. Called when the tracker hits
|
||||
/// its capacity ceiling. If the prune doesn't reclaim anything (every entry is in
|
||||
/// window), the cap is enforced by clearing — the worst case is a few extra
|
||||
/// Fallthrough_NotBuilt returns until traffic re-establishes hot chunks.
|
||||
/// </summary>
|
||||
private void PruneMissTracker(uint now)
|
||||
{
|
||||
var window = MissPromotionWindowMs;
|
||||
var beforeCount = _chunkMissTracker.Count;
|
||||
var toRemove = new List<long>();
|
||||
foreach (var kvp in _chunkMissTracker)
|
||||
{
|
||||
if (now - kvp.Value.LastMissTickStamp > window)
|
||||
{
|
||||
toRemove.Add(kvp.Key);
|
||||
}
|
||||
}
|
||||
return BuildChunk(map, chunkX, chunkY);
|
||||
foreach (var k in toRemove)
|
||||
{
|
||||
_chunkMissTracker.Remove(k);
|
||||
}
|
||||
if (_chunkMissTracker.Count == beforeCount)
|
||||
{
|
||||
_chunkMissTracker.Clear();
|
||||
}
|
||||
}
|
||||
|
||||
private StepChunk BuildChunk(Map map, int chunkX, int chunkY)
|
||||
|
|
@ -440,7 +710,12 @@ public sealed class StepCache
|
|||
// Tier 4 strata accumulator. Lazily allocated when the first multi-Z cell
|
||||
// appears; otherwise the chunk has zero strata overhead.
|
||||
ushort[] strataOffsetByCell = null;
|
||||
System.Collections.Generic.List<byte> strataData = null;
|
||||
List<byte> strataData = null;
|
||||
|
||||
// Reused per cell: the standable surface Zs (walkway / bridge / floor levels). 16 is
|
||||
// generous — clearance forces standable surfaces >= PersonHeight apart, so a 256-tall
|
||||
// Z range admits at most ~16 anyway.
|
||||
Span<sbyte> surfaceZs = stackalloc sbyte[16];
|
||||
|
||||
for (var dy = 0; dy < ChunkSize; dy++)
|
||||
{
|
||||
|
|
@ -452,10 +727,18 @@ public sealed class StepCache
|
|||
|
||||
map.GetAverageZ(x, y, out _, out var avgZ, out _);
|
||||
|
||||
// Bake from the slow path's "standing Z" (the surface Z a creature actually
|
||||
// stands at, not the ground avg). A* tracks newZ as standing Z, so SourceZ
|
||||
// must match for the source-Z guard not to over-fire.
|
||||
var standingZ = (sbyte)StepProbe.ComputeStandingZ(map, x, y, avgZ);
|
||||
// Anchor the cell at the surface a creature actually STANDS on, not the land
|
||||
// average. For plain overworld that's the land; for static-over-land terrain
|
||||
// (sewer/dungeon walkways, bridges, stair treads, raised foundations, upper
|
||||
// building floors) it's the walkable static surface — which the old
|
||||
// ComputeStandingZ(avgZ) anchor missed, producing source-Z fallthroughs (or,
|
||||
// within the StepHeight tolerance band on stairs, a wrong vertical-neighbor
|
||||
// answer baked at the adjacent tread). ComputeStandableSurfaceZs returns the
|
||||
// standable surfaces ascending; the lowest is the primary anchor and A* tracks
|
||||
// newZ to match it. Cells with no standable walk surface (deep water, solid
|
||||
// rock) fall back to the land avg so the swim layer / wetMask still bake.
|
||||
var surfaceCount = StepProbe.ComputeStandableSurfaceZs(map, x, y, surfaceZs);
|
||||
var standingZ = surfaceCount > 0 ? surfaceZs[0] : (sbyte)Math.Clamp(avgZ, sbyte.MinValue, sbyte.MaxValue);
|
||||
|
||||
var result = StepProbe.ComputeMaskAt(map, x, y, standingZ);
|
||||
|
||||
|
|
@ -479,39 +762,69 @@ public sealed class StepCache
|
|||
chunk.SwimZW[cell] = result.SwimZ_W;
|
||||
chunk.SwimZNW[cell] = result.SwimZ_NW;
|
||||
|
||||
// Multi-Z handling: if the cell has 2+ reachable surfaces, compute its
|
||||
// Tier 4 strata so future queries can be answered without falling through
|
||||
// to the slow path. ComputeStrataAt returns null for single-Z cells.
|
||||
if (CountReachableSurfaces(map, x, y, standingZ) > 1)
|
||||
// Shore-cell handling: if the cell has BOTH a walk surface (standing Z)
|
||||
// AND a water surface (Wet land tile or wet static) at a Z separated by
|
||||
// > StepHeight, populate the swim layer at swim-perspective Z. Only when
|
||||
// ComputeMaskAt produces a non-zero swim mask — bridges/docks/piers with
|
||||
// insufficient vertical clearance for a swim creature's body envelope
|
||||
// produce wetMask=0 (StaticsBlockAt rejects them), and we skip those cells
|
||||
// rather than baking a stratum that always answers "no movement." The
|
||||
// sentinel NoSwimLayerCell stays in SwimSourceZ for skipped cells; the
|
||||
// chunk only sets HasSwimLayer when at least one cell got a usable entry.
|
||||
var swimZRaw = StepProbe.ComputeSwimStandingZ(map, x, y);
|
||||
if (swimZRaw != int.MinValue && Math.Abs(swimZRaw - standingZ) > StepHeight)
|
||||
{
|
||||
var strata = StepProbe.ComputeStrataAt(map, x, y);
|
||||
if (strata != null)
|
||||
var swimSrc = (sbyte)Math.Clamp(swimZRaw, sbyte.MinValue + 1, sbyte.MaxValue);
|
||||
var swimResult = StepProbe.ComputeMaskAt(map, x, y, swimSrc);
|
||||
if (swimResult.WetMask != 0)
|
||||
{
|
||||
if (strataOffsetByCell == null)
|
||||
if (chunk.SwimSourceZ == null)
|
||||
{
|
||||
strataOffsetByCell = new ushort[StepChunk.CellsPerChunk];
|
||||
for (var i = 0; i < strataOffsetByCell.Length; i++)
|
||||
{
|
||||
strataOffsetByCell[i] = StepChunk.NoStrata;
|
||||
}
|
||||
strataData = new System.Collections.Generic.List<byte>(256);
|
||||
chunk.AllocateSwimLayer();
|
||||
}
|
||||
chunk.SwimSourceZ[cell] = swimSrc;
|
||||
chunk.SwimMask[cell] = swimResult.WetMask;
|
||||
chunk.SwimZN_Layer[cell] = swimResult.SwimZ_N;
|
||||
chunk.SwimZNE_Layer[cell] = swimResult.SwimZ_NE;
|
||||
chunk.SwimZE_Layer[cell] = swimResult.SwimZ_E;
|
||||
chunk.SwimZSE_Layer[cell] = swimResult.SwimZ_SE;
|
||||
chunk.SwimZS_Layer[cell] = swimResult.SwimZ_S;
|
||||
chunk.SwimZSW_Layer[cell] = swimResult.SwimZ_SW;
|
||||
chunk.SwimZW_Layer[cell] = swimResult.SwimZ_W;
|
||||
chunk.SwimZNW_Layer[cell] = swimResult.SwimZ_NW;
|
||||
}
|
||||
}
|
||||
|
||||
// Cap at 65,535 byte offsets — well above realistic per-chunk
|
||||
// strata volume. If we ever blow past this we'd silently truncate;
|
||||
// assert as a defensive guard.
|
||||
if (strataData.Count > ushort.MaxValue - StepChunk.StratumByteLength * 8)
|
||||
// Stacked walkable surfaces at one cell (ground + 1st + 2nd building floors,
|
||||
// a bridge over a walkable path, etc.): bake a stratum per standable surface
|
||||
// so a query at any floor's Z hits. The primary (lowest) surface is also in
|
||||
// the main mask above, but multi-Z cells are served exclusively from strata,
|
||||
// so every standable surface — including the primary — must appear here.
|
||||
// Single-surface cells (the common case, incl. stair treads and sewer
|
||||
// walkways) skip this entirely and stay on the fast single-mask path.
|
||||
if (surfaceCount >= 2)
|
||||
{
|
||||
if (strataOffsetByCell == null)
|
||||
{
|
||||
strataOffsetByCell = new ushort[StepChunk.CellsPerChunk];
|
||||
for (var i = 0; i < strataOffsetByCell.Length; i++)
|
||||
{
|
||||
// Should never happen for sane tile data; bail to fallthrough.
|
||||
strataOffsetByCell[i] = StepChunk.NoStrata;
|
||||
}
|
||||
else
|
||||
strataData = new List<byte>(256);
|
||||
}
|
||||
|
||||
// Cap at 65,535 byte offsets — well above realistic per-chunk strata
|
||||
// volume. If we ever blow past this we silently leave the cell single-Z
|
||||
// (it keeps the land-anchored main mask and falls through off-surface).
|
||||
if (strataData.Count <= ushort.MaxValue - StepChunk.StratumByteLength * 8)
|
||||
{
|
||||
strataOffsetByCell[cell] = (ushort)strataData.Count;
|
||||
strataData.Add((byte)surfaceCount);
|
||||
for (var i = 0; i < surfaceCount; i++)
|
||||
{
|
||||
strataOffsetByCell[cell] = (ushort)strataData.Count;
|
||||
strataData.Add((byte)strata.Length);
|
||||
for (var s = 0; s < strata.Length; s++)
|
||||
{
|
||||
AppendStratumBytes(strataData, strata[s]);
|
||||
}
|
||||
var sz = surfaceZs[i];
|
||||
AppendStratumBytes(strataData, new StepProbe.ComputedStratum(sz, StepProbe.ComputeMaskAt(map, x, y, sz)));
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -593,9 +906,7 @@ public sealed class StepCache
|
|||
return false;
|
||||
}
|
||||
|
||||
private static void AppendStratumBytes(
|
||||
System.Collections.Generic.List<byte> dst, in StepProbe.ComputedStratum s
|
||||
)
|
||||
private static void AppendStratumBytes(List<byte> dst, in StepProbe.ComputedStratum s)
|
||||
{
|
||||
dst.Add((byte)s.ZCenter);
|
||||
dst.Add(s.Mask.WalkMask);
|
||||
|
|
@ -620,54 +931,4 @@ public sealed class StepCache
|
|||
|
||||
private const int PersonHeight = 16;
|
||||
private const int StepHeight = 2;
|
||||
|
||||
/// <summary>
|
||||
/// Counts walkable surfaces actually reachable from a creature standing at sourceZ.
|
||||
/// Mirrors <see cref="StepProbe"/>.CheckStaticStep so cells flagged multi-Z
|
||||
/// here are exactly those where the baker would have multiple candidate destinations.
|
||||
/// Reachable when: surface and !impassable; stepTop ≥ itemTop; vertical overlap with
|
||||
/// the creature's PersonHeight envelope.
|
||||
/// </summary>
|
||||
internal static int CountReachableSurfaces(Map map, int x, int y, sbyte sourceZ)
|
||||
{
|
||||
var startTop = sourceZ + PersonHeight;
|
||||
var stepTop = startTop + StepHeight;
|
||||
var count = 0;
|
||||
|
||||
foreach (var tile in map.Tiles.GetStaticAndMultiTiles(x, y))
|
||||
{
|
||||
var data = TileData.ItemTable[tile.ID & TileData.MaxItemValue];
|
||||
if (!data.Surface || data.Impassable)
|
||||
{
|
||||
continue;
|
||||
}
|
||||
|
||||
var itemZ = tile.Z;
|
||||
var itemTop = data.Bridge ? itemZ : itemZ + data.Height;
|
||||
|
||||
if (stepTop < itemTop)
|
||||
{
|
||||
continue;
|
||||
}
|
||||
|
||||
if (sourceZ + PersonHeight > itemZ && itemZ + data.Height > sourceZ)
|
||||
{
|
||||
count++;
|
||||
}
|
||||
}
|
||||
|
||||
// Land surface check — same shape, but use GetAverageZ for the land's effective top.
|
||||
var landTile = map.Tiles.GetLandTile(x, y);
|
||||
var landFlags = TileData.LandTable[landTile.ID & TileData.MaxLandValue].Flags;
|
||||
if (!landTile.Ignored && (landFlags & TileFlag.Impassable) == 0)
|
||||
{
|
||||
map.GetAverageZ(x, y, out var landZ, out _, out var landTop);
|
||||
if (stepTop >= landZ && sourceZ + PersonHeight > landZ && landTop > sourceZ)
|
||||
{
|
||||
count++;
|
||||
}
|
||||
}
|
||||
|
||||
return count;
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -14,11 +14,11 @@ namespace Server.Engines.Pathing.Cache;
|
|||
/// only when the cache asks for them. RAM stays bounded by MaxResidentChunks regardless
|
||||
/// of file size.
|
||||
///
|
||||
/// File layout v2 (little-endian, BufferWriter / BufferReader convention):
|
||||
/// File layout v3 (little-endian, BufferWriter / BufferReader convention):
|
||||
///
|
||||
/// Header (48 bytes):
|
||||
/// u32 Magic = 0x42575300 ('SWB\0')
|
||||
/// u32 Version = current FormatVersion (2)
|
||||
/// u32 Version = current FormatVersion (3)
|
||||
/// u32 MapId
|
||||
/// u64 Fingerprint XxHash3 over (1) LandTable + ItemTable flags AND (2) the
|
||||
/// on-disk bytes of mapX.mul / .uop, staidxX.mul, staticsX.mul.
|
||||
|
|
@ -35,11 +35,16 @@ namespace Server.Engines.Pathing.Cache;
|
|||
/// u16 ChunkY
|
||||
/// u32 BuiltMultisVersion
|
||||
/// u8 HasStrata 0 = single-Z chunk (no strata trailer); 1 = strata trailer follows
|
||||
/// u8 HasSwimLayer 0 = no shore cells (no swim trailer); 1 = swim trailer follows
|
||||
/// byte WalkMask[256]
|
||||
/// byte WetMask[256]
|
||||
/// sbyte SourceZ[256]
|
||||
/// sbyte WalkZN[256]..WalkZNW[256] (8 arrays in N,NE,E,SE,S,SW,W,NW order)
|
||||
/// sbyte SwimZN[256]..SwimZNW[256] (8 arrays in same order)
|
||||
/// sbyte SwimZN[256]..SwimZNW[256] (8 arrays in same order; baked at WALK source-Z)
|
||||
/// // Swim layer trailer — only when HasSwimLayer == 1 (chunks containing shore cells):
|
||||
/// sbyte SwimSourceZ[256] (NoSwimLayerCell sentinel = sbyte.MinValue)
|
||||
/// byte SwimMask[256] (per-cell swim mask baked at SwimSourceZ)
|
||||
/// sbyte SwimZN_Layer[256]..SwimZNW_Layer[256] (8 arrays, dest-Z at swim perspective)
|
||||
/// // Strata trailer — only when HasStrata == 1:
|
||||
/// u16 StrataOffsetByCell[256] (NoStrata sentinel = 0xFFFF)
|
||||
/// u32 StrataDataLength
|
||||
|
|
@ -63,15 +68,20 @@ namespace Server.Engines.Pathing.Cache;
|
|||
internal static class StepCacheFile
|
||||
{
|
||||
public const uint Magic = 0x42575300; // 'SWB\0'
|
||||
public const uint FormatVersion = 2;
|
||||
public const uint FormatVersion = 4;
|
||||
|
||||
/// <summary>
|
||||
/// Lowest format version this binary can load. Files below this version are treated as
|
||||
/// missing (silently rejected) — a subsequent SaveToFile / BakeMap overwrites them with
|
||||
/// the current FormatVersion. Bumped to 2 when Tier 4 multi-Z strata landed; v1 had no
|
||||
/// strata data and is incompatible with the strata-aware lookup path.
|
||||
/// the current FormatVersion. Bumped to 3 when the swim layer landed (v2 had no swim
|
||||
/// layer). Bumped to 4 when the baker switched to clearance-aware standable-surface
|
||||
/// strata: v3 bakes anchored every cell at the land average and so missed walkable
|
||||
/// static-over-land surfaces (sewer/dungeon walkways, bridges, upper building floors),
|
||||
/// producing ~98% source-Z fallthroughs on those routes. The on-disk layout is
|
||||
/// unchanged; only the strata population differs, so the bump exists purely to force a
|
||||
/// one-time re-bake of stale v3 files on first boot under the new binary.
|
||||
/// </summary>
|
||||
public const uint MinSupportedVersion = 2;
|
||||
public const uint MinSupportedVersion = 4;
|
||||
|
||||
private const int HeaderSize =
|
||||
sizeof(uint) // Magic
|
||||
|
|
@ -87,15 +97,19 @@ internal static class StepCacheFile
|
|||
// single bulk read per chunk without consulting the next offset.
|
||||
private const int IndexEntryBytes = sizeof(ulong) + sizeof(ulong) + sizeof(uint);
|
||||
|
||||
/// <summary>Fixed-size portion of a chunk record (everything except the optional strata trailer).</summary>
|
||||
/// <summary>Fixed-size portion of a chunk record (everything except the optional strata + swim trailers).</summary>
|
||||
private const int BytesPerChunkBase =
|
||||
sizeof(ushort) + sizeof(ushort) + sizeof(uint) + sizeof(byte)
|
||||
sizeof(ushort) + sizeof(ushort) + sizeof(uint)
|
||||
+ sizeof(byte) + sizeof(byte) // HasStrata + HasSwimLayer
|
||||
+ StepChunk.CellsPerChunk // WalkMask
|
||||
+ StepChunk.CellsPerChunk // WetMask
|
||||
+ StepChunk.CellsPerChunk // SourceZ
|
||||
+ 8 * StepChunk.CellsPerChunk // WalkZ[8]
|
||||
+ 8 * StepChunk.CellsPerChunk; // SwimZ[8]
|
||||
|
||||
/// <summary>Swim-layer trailer overhead when present: per-cell SourceZ + Mask + 8×Z arrays.</summary>
|
||||
private const int SwimLayerOverhead = 10 * StepChunk.CellsPerChunk;
|
||||
|
||||
/// <summary>Strata trailer overhead when present: 256×u16 offset table + u32 data length.</summary>
|
||||
private const int StrataTrailerOverhead = StepChunk.CellsPerChunk * sizeof(ushort) + sizeof(uint);
|
||||
|
||||
|
|
@ -201,9 +215,10 @@ internal static class StepCacheFile
|
|||
{
|
||||
Directory.CreateDirectory(Path.GetDirectoryName(path) ?? ".");
|
||||
|
||||
// Initial estimate: base record + a modest strata budget per chunk. BufferWriter
|
||||
// grows on overflow, so under-estimating just causes a few realloc/copy cycles
|
||||
// during the bake — not a correctness issue.
|
||||
// Initial estimate: base record + a modest strata budget per chunk. Coastline
|
||||
// chunks add another ~2.5 KB (swim layer) but they're a small fraction of any
|
||||
// map; the writer grows on overflow so under-estimating just causes a few
|
||||
// realloc/copy cycles during the bake — not a correctness issue.
|
||||
var capacity = HeaderSize
|
||||
+ (BytesPerChunkBase + 256) * (int)chunkCount
|
||||
+ IndexEntryBytes * (int)chunkCount;
|
||||
|
|
@ -355,7 +370,9 @@ internal static class StepCacheFile
|
|||
var strataOffsetByCell = chunk.GetStrataOffsetByCellForSerialization();
|
||||
var strataData = chunk.GetStrataDataForSerialization();
|
||||
var hasStrata = strataOffsetByCell != null;
|
||||
var hasSwimLayer = chunk.HasSwimLayer;
|
||||
w.Write((byte)(hasStrata ? 1 : 0));
|
||||
w.Write((byte)(hasSwimLayer ? 1 : 0));
|
||||
|
||||
w.Write(chunk.WalkMask);
|
||||
w.Write(chunk.WetMask);
|
||||
|
|
@ -379,6 +396,20 @@ internal static class StepCacheFile
|
|||
WriteSBytes(w, chunk.SwimZW);
|
||||
WriteSBytes(w, chunk.SwimZNW);
|
||||
|
||||
if (hasSwimLayer)
|
||||
{
|
||||
WriteSBytes(w, chunk.SwimSourceZ);
|
||||
w.Write(chunk.SwimMask);
|
||||
WriteSBytes(w, chunk.SwimZN_Layer);
|
||||
WriteSBytes(w, chunk.SwimZNE_Layer);
|
||||
WriteSBytes(w, chunk.SwimZE_Layer);
|
||||
WriteSBytes(w, chunk.SwimZSE_Layer);
|
||||
WriteSBytes(w, chunk.SwimZS_Layer);
|
||||
WriteSBytes(w, chunk.SwimZSW_Layer);
|
||||
WriteSBytes(w, chunk.SwimZW_Layer);
|
||||
WriteSBytes(w, chunk.SwimZNW_Layer);
|
||||
}
|
||||
|
||||
if (hasStrata)
|
||||
{
|
||||
// 256 × u16 offsets, then u32 length-prefixed strata byte array.
|
||||
|
|
@ -403,6 +434,7 @@ internal static class StepCacheFile
|
|||
r.ReadUShort();
|
||||
var multisVersion = (int)r.ReadUInt();
|
||||
var hasStrata = r.ReadByte() != 0;
|
||||
var hasSwimLayer = r.ReadByte() != 0;
|
||||
|
||||
var chunk = new StepChunk { BuiltMultisVersion = multisVersion };
|
||||
|
||||
|
|
@ -428,6 +460,21 @@ internal static class StepCacheFile
|
|||
ReadSBytes(r, chunk.SwimZW);
|
||||
ReadSBytes(r, chunk.SwimZNW);
|
||||
|
||||
if (hasSwimLayer)
|
||||
{
|
||||
chunk.AllocateSwimLayer();
|
||||
ReadSBytes(r, chunk.SwimSourceZ);
|
||||
r.Read(chunk.SwimMask);
|
||||
ReadSBytes(r, chunk.SwimZN_Layer);
|
||||
ReadSBytes(r, chunk.SwimZNE_Layer);
|
||||
ReadSBytes(r, chunk.SwimZE_Layer);
|
||||
ReadSBytes(r, chunk.SwimZSE_Layer);
|
||||
ReadSBytes(r, chunk.SwimZS_Layer);
|
||||
ReadSBytes(r, chunk.SwimZSW_Layer);
|
||||
ReadSBytes(r, chunk.SwimZW_Layer);
|
||||
ReadSBytes(r, chunk.SwimZNW_Layer);
|
||||
}
|
||||
|
||||
if (hasStrata)
|
||||
{
|
||||
var offsets = new ushort[StepChunk.CellsPerChunk];
|
||||
|
|
@ -472,6 +519,19 @@ internal static class StepCacheFile
|
|||
|
||||
public bool Has(int chunkX, int chunkY) => _offsets.ContainsKey(PackChunkKey(chunkX, chunkY));
|
||||
|
||||
/// <summary>
|
||||
/// Enumerates every (chunkX, chunkY) coordinate the file holds. Used by
|
||||
/// <see cref="StepCache"/> when preload is enabled to materialize all chunks
|
||||
/// upfront instead of on first query.
|
||||
/// </summary>
|
||||
public IEnumerable<(int chunkX, int chunkY)> EnumerateChunkCoords()
|
||||
{
|
||||
foreach (var key in _offsets.Keys)
|
||||
{
|
||||
yield return ((int)(key >> 32), (int)(key & 0xFFFFFFFF));
|
||||
}
|
||||
}
|
||||
|
||||
internal LazyReader(
|
||||
FileStream stream, uint mapId, ulong fingerprint, ulong bakeTimestamp,
|
||||
uint chunkCount, Dictionary<ulong, (ulong offset, uint length)> offsets
|
||||
|
|
|
|||
|
|
@ -37,6 +37,91 @@ internal sealed class StepChunk
|
|||
public readonly sbyte[] SwimZW = new sbyte[CellsPerChunk];
|
||||
public readonly sbyte[] SwimZNW = new sbyte[CellsPerChunk];
|
||||
|
||||
/// <summary>
|
||||
/// Swim layer — populated only for chunks containing at least one shore cell (a cell
|
||||
/// with both a walkable land surface and a water surface separated by > StepHeight).
|
||||
/// On shore cells, queries from the swim source Z miss the primary source-Z guard;
|
||||
/// the swim layer carries the correct wetMask + per-direction destination Zs computed
|
||||
/// from the water surface's perspective. For non-shore cells in a chunk that has the
|
||||
/// layer, <see cref="SwimSourceZ"/>[cell] = <see cref="NoSwimLayerCell"/> sentinel.
|
||||
/// All swim-layer arrays are null on chunks with no shore cells (~90% of map chunks
|
||||
/// on Trammel) — zero memory cost on the common case.
|
||||
/// </summary>
|
||||
public const sbyte NoSwimLayerCell = sbyte.MinValue;
|
||||
|
||||
private sbyte[] _swimSourceZ;
|
||||
private byte[] _swimMask;
|
||||
private sbyte[] _swimZN_extra;
|
||||
private sbyte[] _swimZNE_extra;
|
||||
private sbyte[] _swimZE_extra;
|
||||
private sbyte[] _swimZSE_extra;
|
||||
private sbyte[] _swimZS_extra;
|
||||
private sbyte[] _swimZSW_extra;
|
||||
private sbyte[] _swimZW_extra;
|
||||
private sbyte[] _swimZNW_extra;
|
||||
|
||||
/// <summary>True when this chunk has at least one shore cell with a populated swim layer.</summary>
|
||||
public bool HasSwimLayer => _swimSourceZ != null;
|
||||
|
||||
/// <summary>Per-cell water-surface standing Z (or <see cref="NoSwimLayerCell"/>). Null when chunk has no swim layer.</summary>
|
||||
public sbyte[] SwimSourceZ => _swimSourceZ;
|
||||
/// <summary>Per-cell swim mask computed at <see cref="SwimSourceZ"/>. Null when chunk has no swim layer.</summary>
|
||||
public byte[] SwimMask => _swimMask;
|
||||
public sbyte[] SwimZN_Layer => _swimZN_extra;
|
||||
public sbyte[] SwimZNE_Layer => _swimZNE_extra;
|
||||
public sbyte[] SwimZE_Layer => _swimZE_extra;
|
||||
public sbyte[] SwimZSE_Layer => _swimZSE_extra;
|
||||
public sbyte[] SwimZS_Layer => _swimZS_extra;
|
||||
public sbyte[] SwimZSW_Layer => _swimZSW_extra;
|
||||
public sbyte[] SwimZW_Layer => _swimZW_extra;
|
||||
public sbyte[] SwimZNW_Layer => _swimZNW_extra;
|
||||
|
||||
/// <summary>
|
||||
/// Lazily allocates the swim-layer arrays and seeds <see cref="SwimSourceZ"/> with
|
||||
/// the <see cref="NoSwimLayerCell"/> sentinel. Called at bake time the first time a
|
||||
/// shore cell is detected in this chunk.
|
||||
/// </summary>
|
||||
internal void AllocateSwimLayer()
|
||||
{
|
||||
if (_swimSourceZ != null)
|
||||
{
|
||||
return;
|
||||
}
|
||||
_swimSourceZ = new sbyte[CellsPerChunk];
|
||||
_swimMask = new byte[CellsPerChunk];
|
||||
_swimZN_extra = new sbyte[CellsPerChunk];
|
||||
_swimZNE_extra = new sbyte[CellsPerChunk];
|
||||
_swimZE_extra = new sbyte[CellsPerChunk];
|
||||
_swimZSE_extra = new sbyte[CellsPerChunk];
|
||||
_swimZS_extra = new sbyte[CellsPerChunk];
|
||||
_swimZSW_extra = new sbyte[CellsPerChunk];
|
||||
_swimZW_extra = new sbyte[CellsPerChunk];
|
||||
_swimZNW_extra = new sbyte[CellsPerChunk];
|
||||
for (var i = 0; i < CellsPerChunk; i++)
|
||||
{
|
||||
_swimSourceZ[i] = NoSwimLayerCell;
|
||||
}
|
||||
}
|
||||
|
||||
/// <summary>Test/serialization hook: install pre-built swim-layer arrays. Pass nulls to clear.</summary>
|
||||
internal void SetSwimLayer(
|
||||
sbyte[] swimSourceZ, byte[] swimMask,
|
||||
sbyte[] zN, sbyte[] zNE, sbyte[] zE, sbyte[] zSE,
|
||||
sbyte[] zS, sbyte[] zSW, sbyte[] zW, sbyte[] zNW
|
||||
)
|
||||
{
|
||||
_swimSourceZ = swimSourceZ;
|
||||
_swimMask = swimMask;
|
||||
_swimZN_extra = zN;
|
||||
_swimZNE_extra = zNE;
|
||||
_swimZE_extra = zE;
|
||||
_swimZSE_extra = zSE;
|
||||
_swimZS_extra = zS;
|
||||
_swimZSW_extra = zSW;
|
||||
_swimZW_extra = zW;
|
||||
_swimZNW_extra = zNW;
|
||||
}
|
||||
|
||||
/// <summary>Sentinel: cell has no strata — single-Z, use the main Walk/Wet arrays.</summary>
|
||||
public const ushort NoStrata = ushort.MaxValue;
|
||||
|
||||
|
|
|
|||
|
|
@ -102,6 +102,87 @@ public static class StepProbe
|
|||
return strata;
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// Writes the distinct surface Zs at (x, y) that a default walker (PersonHeight envelope)
|
||||
/// can actually STAND on — each candidate surface (walkable land center + every walkable
|
||||
/// static top) that has PersonHeight of vertical clearance free of impassable statics —
|
||||
/// into <paramref name="zs"/>, ascending, and returns the count.
|
||||
///
|
||||
/// This is the clearance-aware counterpart to <see cref="ComputeStrataAt"/>'s candidate
|
||||
/// gather: it drops surfaces a creature cannot occupy (land under a sewer walkway, ground
|
||||
/// under a low bridge), so the result is exactly the set of standing Zs the slow path can
|
||||
/// resolve to. Two standable surfaces are inherently >= PersonHeight apart (an upper
|
||||
/// surface within PersonHeight of a lower one removes the lower one's clearance), so a
|
||||
/// single ascending pass with an exact-duplicate skip is sufficient.
|
||||
///
|
||||
/// Used by the baker to capture walkable static-over-land surfaces (sewer/dungeon
|
||||
/// walkways, bridges, raised foundations, upper building floors) that the land-anchored
|
||||
/// main mask would otherwise miss.
|
||||
/// </summary>
|
||||
public static int ComputeStandableSurfaceZs(Map map, int x, int y, Span<sbyte> zs)
|
||||
{
|
||||
if (map == null || map == Map.Internal)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
if (x < 0 || y < 0 || x >= map.Width || y >= map.Height)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
Span<int> cand = stackalloc int[16];
|
||||
var count = 0;
|
||||
|
||||
var landTile = map.Tiles.GetLandTile(x, y);
|
||||
var landFlags = TileData.LandTable[landTile.ID & TileData.MaxLandValue].Flags;
|
||||
if (!landTile.Ignored && (landFlags & TileFlag.Impassable) == 0)
|
||||
{
|
||||
map.GetAverageZ(x, y, out _, out var landCenter, out _);
|
||||
cand[count++] = landCenter;
|
||||
}
|
||||
|
||||
foreach (var tile in map.Tiles.GetStaticAndMultiTiles(x, y))
|
||||
{
|
||||
if (count >= cand.Length)
|
||||
{
|
||||
break;
|
||||
}
|
||||
var data = TileData.ItemTable[tile.ID & TileData.MaxItemValue];
|
||||
if (!data.Surface || data.Impassable)
|
||||
{
|
||||
continue;
|
||||
}
|
||||
cand[count++] = tile.Z + data.CalcHeight;
|
||||
}
|
||||
|
||||
if (count == 0)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
cand[..count].Sort();
|
||||
|
||||
var n = 0;
|
||||
for (var i = 0; i < count && n < zs.Length; i++)
|
||||
{
|
||||
var cz = (sbyte)Math.Clamp(cand[i], sbyte.MinValue + 1, sbyte.MaxValue);
|
||||
if (n > 0 && zs[n - 1] == cz)
|
||||
{
|
||||
continue;
|
||||
}
|
||||
// Standable iff the creature's PersonHeight body envelope above this surface is
|
||||
// free of impassable statics. The surface itself never blocks (its top == cz,
|
||||
// which is the envelope floor, not inside it).
|
||||
if (StaticsBlockAt(map, x, y, cz, cz + PersonHeight))
|
||||
{
|
||||
continue;
|
||||
}
|
||||
zs[n++] = cz;
|
||||
}
|
||||
|
||||
return n;
|
||||
}
|
||||
|
||||
public static StepMask ComputeMaskAt(Map map, int x, int y, sbyte sourceZ)
|
||||
{
|
||||
if (map == null || map == Map.Internal)
|
||||
|
|
@ -166,6 +247,45 @@ public static class StepProbe
|
|||
return zCenter;
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// Returns the water-surface standing Z at (x, y) — the Z a swim-only mob would stand
|
||||
/// at on this cell — or <see cref="int.MinValue"/> if no water surface exists. Used
|
||||
/// by <see cref="StepCache"/> to detect shore cells (cells with both walk and swim
|
||||
/// surfaces separated by > StepHeight) and bake their swim layer at swim-perspective Z.
|
||||
/// </summary>
|
||||
public static int ComputeSwimStandingZ(Map map, int x, int y)
|
||||
{
|
||||
if (map == null || map == Map.Internal)
|
||||
{
|
||||
return int.MinValue;
|
||||
}
|
||||
if (x < 0 || y < 0 || x >= map.Width || y >= map.Height)
|
||||
{
|
||||
return int.MinValue;
|
||||
}
|
||||
|
||||
// Land tile flagged Wet — its center Z is the swim surface.
|
||||
var landTile = map.Tiles.GetLandTile(x, y);
|
||||
var landFlags = TileData.LandTable[landTile.ID & TileData.MaxLandValue].Flags;
|
||||
if (!landTile.Ignored && (landFlags & TileFlag.Wet) != 0)
|
||||
{
|
||||
map.GetAverageZ(x, y, out _, out var landCenter, out _);
|
||||
return landCenter;
|
||||
}
|
||||
|
||||
// Otherwise scan statics for a wet surface.
|
||||
foreach (var tile in map.Tiles.GetStaticAndMultiTiles(x, y))
|
||||
{
|
||||
var data = TileData.ItemTable[tile.ID & TileData.MaxItemValue];
|
||||
if (data.Wet)
|
||||
{
|
||||
return tile.Z + data.CalcHeight;
|
||||
}
|
||||
}
|
||||
|
||||
return int.MinValue;
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// Mirrors GetStartZ from MovementImpl, parameterized by canSwim / cantWalk.
|
||||
/// </summary>
|
||||
|
|
|
|||
|
|
@ -7,9 +7,14 @@ namespace Server.Engines.Pathing;
|
|||
/// Admin commands for inspecting and operating the pathfinding step cache.
|
||||
/// [PathCacheStats — current resident-chunk count + hit/miss/eviction telemetry.
|
||||
/// [PathCacheClear — drop all cached chunks, close lazy readers, zero counters.
|
||||
/// [PathBake — walk a whole map building the full static cache, then save it.
|
||||
/// [PathCacheSave — persist resident chunks per map to Data/Pathfinding/<mapId>.swb.
|
||||
/// [PathCacheLoad — open those files as lazy backing stores. Also runs at startup.
|
||||
/// [PathRecord — toggle JSONL telemetry capture for replay / benchmark corpora.
|
||||
///
|
||||
/// The step cache works WITHOUT any .swb file — chunks build on demand as creatures path.
|
||||
/// A baked .swb is an optional optimization that removes first-pathfind-after-boot latency
|
||||
/// for shard owners who want it; <see cref="OnPathBake"/> is how you produce one.
|
||||
/// </summary>
|
||||
public static class PathCacheCommands
|
||||
{
|
||||
|
|
@ -30,6 +35,7 @@ public static class PathCacheCommands
|
|||
|
||||
CommandSystem.Register("PathCacheStats", AccessLevel.Administrator, OnPathCacheStats);
|
||||
CommandSystem.Register("PathCacheClear", AccessLevel.Administrator, OnPathCacheClear);
|
||||
CommandSystem.Register("PathBake", AccessLevel.Administrator, OnPathBake);
|
||||
CommandSystem.Register("PathCacheSave", AccessLevel.Administrator, OnPathCacheSave);
|
||||
CommandSystem.Register("PathCacheLoad", AccessLevel.Administrator, OnPathCacheLoad);
|
||||
CommandSystem.Register("PathRecord", AccessLevel.Administrator, OnPathRecord);
|
||||
|
|
@ -78,6 +84,55 @@ public static class PathCacheCommands
|
|||
e.Mobile.SendMessage($"StepCache cleared: {residentBefore} chunks dropped, counters reset.");
|
||||
}
|
||||
|
||||
[Usage("PathBake [mapId]")]
|
||||
[Description("Walks every chunk of the given map (or all loaded maps) building the full static step cache, then saves it to Data/Pathfinding/<mapId>.swb so a future boot has zero first-pathfind latency. WARNING: blocks the game loop for several seconds and transiently uses hundreds of MB per map — run during maintenance, not peak hours.")]
|
||||
private static void OnPathBake(CommandEventArgs e)
|
||||
{
|
||||
var from = e.Mobile;
|
||||
int? only = e.Arguments.Length > 0 && int.TryParse(e.Arguments[0], out var parsed) ? parsed : null;
|
||||
|
||||
from.SendMessage("PathBake: building the static step cache. The server will pause briefly per map...");
|
||||
|
||||
var totalChunks = 0;
|
||||
var totalMaps = 0;
|
||||
var sw = System.Diagnostics.Stopwatch.StartNew();
|
||||
|
||||
for (var i = 0; i < Map.Maps.Length; i++)
|
||||
{
|
||||
var map = Map.Maps[i];
|
||||
if (map == null || map == Map.Internal || (only.HasValue && map.MapID != only.Value))
|
||||
{
|
||||
continue;
|
||||
}
|
||||
|
||||
// BakeMap walks the whole map (building every chunk) and writes the .swb. The
|
||||
// chunks are left resident afterward; drop them so peak memory is bounded to one
|
||||
// map at a time and the post-command footprint returns to the LRU cap.
|
||||
var written = StepCache.Instance.BakeMap(map.MapID, PathFor(map.MapID));
|
||||
StepCache.Instance.ClearResidentChunks();
|
||||
|
||||
if (written > 0)
|
||||
{
|
||||
totalChunks += written;
|
||||
totalMaps++;
|
||||
from.SendMessage($" map {map.MapID}: {written} chunks → {PathFor(map.MapID)}");
|
||||
}
|
||||
}
|
||||
|
||||
sw.Stop();
|
||||
|
||||
if (totalMaps == 0)
|
||||
{
|
||||
from.SendMessage(only.HasValue ? $"PathBake: map {only.Value} not loaded." : "PathBake: no maps to bake.");
|
||||
return;
|
||||
}
|
||||
|
||||
// Reopen the freshly written files as lazy backing stores so they're usable now
|
||||
// without a restart (resident memory stays bounded by the LRU cap).
|
||||
AutoLoadAtStartup();
|
||||
from.SendMessage($"PathBake: {totalChunks} chunks across {totalMaps} map(s) in {sw.Elapsed.TotalSeconds:F1}s; lazy readers reopened.");
|
||||
}
|
||||
|
||||
[Usage("PathCacheSave")]
|
||||
[Description("Persists resident StepCache chunks for every loaded map to Data/Pathfinding/<mapId>.swb.")]
|
||||
private static void OnPathCacheSave(CommandEventArgs e)
|
||||
|
|
|
|||
205
Projects/UOContent/Engines/Pathing/PathDiag.cs
Normal file
205
Projects/UOContent/Engines/Pathing/PathDiag.cs
Normal file
|
|
@ -0,0 +1,205 @@
|
|||
using System;
|
||||
using System.Diagnostics;
|
||||
using System.IO;
|
||||
using Server.Engines.Pathing.Cache;
|
||||
using Server.PathAlgorithms.BitmapAStar;
|
||||
using Server.Targeting;
|
||||
|
||||
namespace Server.Engines.Pathing;
|
||||
|
||||
/// <summary>
|
||||
/// Developer diagnostic for the bitmap A* step cache. Stand where a creature would start,
|
||||
/// run <c>[PathDiag</c>, and target the goal. The detailed report is appended to
|
||||
/// <c>Logs/pathdiag.log</c>; a short summary is sent to the invoking client. For the route
|
||||
/// it records:
|
||||
/// 1. the raw tile makeup of the start and goal cells (land + statics) and the
|
||||
/// clearance-aware standable surfaces the baker anchors to — the ground truth for
|
||||
/// "why does the cache (not) serve this cell";
|
||||
/// 2. one warm <see cref="StepCache.TryGetMask"/>-served Find with the per-pathfind cache
|
||||
/// hit/fallthrough breakdown and fallthrough fraction — a high fallthrough fraction
|
||||
/// means the cache isn't helping the route (it pays the lookup then uses the slow path);
|
||||
/// 3. warm timing over many iterations.
|
||||
///
|
||||
/// Primarily useful when bringing up custom maps / facets: it shows whether static-over-land
|
||||
/// geometry (dungeon walkways, bridges, stairs, raised foundations, stacked floors) is being
|
||||
/// baked at the right Z.
|
||||
///
|
||||
/// Output goes to a log file rather than the console because the live server uses Serilog and
|
||||
/// raw Console writes interleave badly with it. The promotion gate is forced to eager
|
||||
/// (threshold 1) for the duration so the cache builds on first touch and the numbers reflect
|
||||
/// its best case; the previous threshold is restored afterward.
|
||||
/// </summary>
|
||||
public static class PathDiag
|
||||
{
|
||||
private const int TimingIterations = 200;
|
||||
|
||||
private static string LogPath => Path.Combine(Core.BaseDirectory, "Logs", "pathdiag.log");
|
||||
|
||||
public static void Configure()
|
||||
{
|
||||
CommandSystem.Register("PathDiag", AccessLevel.Administrator, OnPathDiag);
|
||||
}
|
||||
|
||||
[Usage("PathDiag")]
|
||||
[Description("Diagnoses the step cache for a route (results appended to Logs/pathdiag.log): target a tile to record start/goal tile makeup, the per-Find cache hit/fallthrough breakdown, and warm timing.")]
|
||||
private static void OnPathDiag(CommandEventArgs e)
|
||||
{
|
||||
var start = e.Mobile.Location;
|
||||
e.Mobile.SendMessage("PathDiag: target the goal tile.");
|
||||
e.Mobile.BeginTarget(-1, true, TargetFlags.None, (from, targeted) => OnTarget(from, start, targeted));
|
||||
}
|
||||
|
||||
private static void OnTarget(Mobile from, Point3D start, object targeted)
|
||||
{
|
||||
if (targeted is not IPoint3D p)
|
||||
{
|
||||
return;
|
||||
}
|
||||
|
||||
var map = from.Map;
|
||||
var goal = new Point3D(p.X, p.Y, p.Z);
|
||||
|
||||
if (!Utility.InRange(start, goal, 38))
|
||||
{
|
||||
from.SendMessage("PathDiag: goal is outside the A* search window (38 tiles); aborting.");
|
||||
return;
|
||||
}
|
||||
|
||||
var cache = StepCache.Instance;
|
||||
var previousThreshold = cache.MissPromotionThreshold;
|
||||
cache.MissPromotionThreshold = 1; // eager build — measure the cache's best case
|
||||
|
||||
StreamWriter log = null;
|
||||
try
|
||||
{
|
||||
Directory.CreateDirectory(Path.GetDirectoryName(LogPath)!);
|
||||
log = new StreamWriter(new FileStream(LogPath, FileMode.Append, FileAccess.Write, FileShare.Read));
|
||||
|
||||
log.WriteLine($"===== [{Core.Now:yyyy-MM-dd HH:mm:ss}] PathDiag ({start.X},{start.Y},{start.Z}) -> ({goal.X},{goal.Y},{goal.Z}) on {map} =====");
|
||||
|
||||
DumpCell(log, map, start.X, start.Y, start.Z, "start");
|
||||
DumpCell(log, map, goal.X, goal.Y, goal.Z, "goal");
|
||||
var find = RunInstrumentedFind(log, from, map, start, goal);
|
||||
var (minUs, avgUs) = TimeWarm(log, from, map, start, goal);
|
||||
log.WriteLine();
|
||||
|
||||
from.SendMessage($"PathDiag ({start.X},{start.Y},{start.Z})->({goal.X},{goal.Y},{goal.Z}): {find.result}");
|
||||
from.SendMessage($" cache fallthrough {find.fallthroughPct:F1}% of {find.total}; warm min={minUs:F1}us avg={avgUs:F1}us");
|
||||
from.SendMessage($" full report appended to Logs/pathdiag.log");
|
||||
}
|
||||
catch (IOException ex)
|
||||
{
|
||||
from.SendMessage($"PathDiag: failed to write {LogPath}: {ex.Message}");
|
||||
}
|
||||
finally
|
||||
{
|
||||
log?.Dispose();
|
||||
cache.MissPromotionThreshold = previousThreshold;
|
||||
}
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// Writes the raw tile makeup of one cell plus the surfaces the baker anchors to. A large
|
||||
/// gap between the query Z and the standable surfaces is the signature of a route the
|
||||
/// cache can't serve (the creature stands on a static surface far from the land average).
|
||||
/// </summary>
|
||||
private static void DumpCell(TextWriter log, Map map, int x, int y, int queryZ, string label)
|
||||
{
|
||||
map.GetAverageZ(x, y, out var landZ, out var avgZ, out var landTop);
|
||||
var landTile = map.Tiles.GetLandTile(x, y);
|
||||
var landFlags = TileData.LandTable[landTile.ID & TileData.MaxLandValue].Flags;
|
||||
var landImpassable = (landFlags & TileFlag.Impassable) != 0;
|
||||
var landWet = (landFlags & TileFlag.Wet) != 0;
|
||||
|
||||
Span<sbyte> surfaces = stackalloc sbyte[16];
|
||||
var surfaceCount = StepProbe.ComputeStandableSurfaceZs(map, x, y, surfaces);
|
||||
|
||||
log.WriteLine($"{label} cell ({x},{y}) queryZ={queryZ}:");
|
||||
log.WriteLine($" land: avgZ={avgZ} landZ={landZ} landTop={landTop} impassable={landImpassable} wet={landWet} ignored={landTile.Ignored}");
|
||||
|
||||
var sb = new System.Text.StringBuilder();
|
||||
for (var i = 0; i < surfaceCount; i++)
|
||||
{
|
||||
sb.Append(i == 0 ? "" : ",").Append(surfaces[i]);
|
||||
}
|
||||
log.WriteLine($" standable surfaces={surfaceCount} [{sb}] -> {(surfaceCount >= 2 ? "multi-Z (strata)" : "single-Z anchor")}");
|
||||
|
||||
log.WriteLine(" static/multi surfaces:");
|
||||
foreach (var tile in map.Tiles.GetStaticAndMultiTiles(x, y))
|
||||
{
|
||||
var data = TileData.ItemTable[tile.ID & TileData.MaxItemValue];
|
||||
log.WriteLine($" id=0x{tile.ID:X4} z={tile.Z} top={tile.Z + data.CalcHeight} h={data.Height} surface={data.Surface} impass={data.Impassable} bridge={data.Bridge} wet={data.Wet}");
|
||||
}
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// Runs one warm Find and records the StepCache counter delta for it — the per-pathfind
|
||||
/// cache hit/fallthrough mix and the fallthrough fraction. Returns a summary for the
|
||||
/// caller to relay to the player.
|
||||
/// </summary>
|
||||
private static (string result, double fallthroughPct, long total) RunInstrumentedFind(
|
||||
TextWriter log, Mobile from, Map map, Point3D start, Point3D goal
|
||||
)
|
||||
{
|
||||
var cache = StepCache.Instance;
|
||||
|
||||
// Warm every chunk the route touches before measuring.
|
||||
for (var i = 0; i < 3; i++)
|
||||
{
|
||||
BitmapAStarAlgorithm.Instance.Find(from, map, start, goal);
|
||||
}
|
||||
|
||||
var before = cache.GetStats();
|
||||
var path = BitmapAStarAlgorithm.Instance.Find(from, map, start, goal);
|
||||
var after = cache.GetStats();
|
||||
|
||||
var served = after.Hits - before.Hits
|
||||
+ (after.MissesNotBuilt - before.MissesNotBuilt)
|
||||
+ (after.MissesDirtyRebuild - before.MissesDirtyRebuild);
|
||||
var fallthrough = after.FallthroughMultiZ - before.FallthroughMultiZ
|
||||
+ (after.FallthroughSourceZMismatch - before.FallthroughSourceZMismatch)
|
||||
+ (after.FallthroughOffMap - before.FallthroughOffMap)
|
||||
+ (after.FallthroughNotBuilt - before.FallthroughNotBuilt);
|
||||
var total = served + fallthrough;
|
||||
var pct = total == 0 ? 0 : 100.0 * fallthrough / total;
|
||||
var result = path == null ? "NO PATH" : $"{path.Length} steps";
|
||||
|
||||
log.WriteLine($"warm Find: {result}");
|
||||
log.WriteLine($" cache-served={served} fallthrough={fallthrough} ({pct:F1}% of {total} probes)");
|
||||
log.WriteLine($" fallthrough breakdown: multiZ={after.FallthroughMultiZ - before.FallthroughMultiZ} " +
|
||||
$"srcZ={after.FallthroughSourceZMismatch - before.FallthroughSourceZMismatch} " +
|
||||
$"offMap={after.FallthroughOffMap - before.FallthroughOffMap} " +
|
||||
$"notBuilt={after.FallthroughNotBuilt - before.FallthroughNotBuilt}");
|
||||
if (path == null)
|
||||
{
|
||||
log.WriteLine(" NO PATH: goal unreachable within the 38-tile window (or not standable). This is an A* scope limit, independent of the cache.");
|
||||
}
|
||||
|
||||
return (result, pct, total);
|
||||
}
|
||||
|
||||
private static (double minUs, double avgUs) TimeWarm(TextWriter log, Mobile from, Map map, Point3D start, Point3D goal)
|
||||
{
|
||||
var sw = new Stopwatch();
|
||||
var minTicks = long.MaxValue;
|
||||
long totalTicks = 0;
|
||||
|
||||
for (var i = 0; i < TimingIterations; i++)
|
||||
{
|
||||
sw.Restart();
|
||||
BitmapAStarAlgorithm.Instance.Find(from, map, start, goal);
|
||||
sw.Stop();
|
||||
totalTicks += sw.ElapsedTicks;
|
||||
if (sw.ElapsedTicks < minTicks)
|
||||
{
|
||||
minTicks = sw.ElapsedTicks;
|
||||
}
|
||||
}
|
||||
|
||||
var usPerTick = 1_000_000.0 / Stopwatch.Frequency;
|
||||
var minUs = minTicks * usPerTick;
|
||||
var avgUs = totalTicks * usPerTick / TimingIterations;
|
||||
log.WriteLine($"timing over {TimingIterations} warm Finds: min={minUs:F1}us avg={avgUs:F1}us");
|
||||
return (minUs, avgUs);
|
||||
}
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue