feat(pathfinding): lazy .swb backing store for the step cache (#2448)
## Summary Adds a binary disk format + lazy reader so the step cache can warm-start from a precomputed file without paying chunk-build cost on the first pathfind through a region. **Resident memory stays bounded by `MaxResidentChunks` regardless of file size** — opening a `.swb` reads only the header + chunk-offset index (~16 bytes per indexed chunk), and individual chunks are seeked + deserialized only when `ResolveMissingChunk` asks for them. The lazy design (vs. an eager bulk load): a 250 MB bake on a RAM-constrained shard never materializes more than the LRU cap (~40 MB at the default 8192-chunk cap), and unwanted regions never enter memory at all. Builds on PR #2447. ## What changed - **`StepCacheFile`** — binary reader/writer module. Writer emits header → chunks (offsets recorded) → index trailer, then patches the header's `IndexOffset` field. Reader is `OpenForLazy(path)` returning a `LazyReader` that holds an open `FileStream` + offset dictionary. - **`StepCacheFile.LazyReader`** — `TryReadChunk(chunkX, chunkY)` does a single seek + bulk read for one record. `Dispose` releases the underlying stream. Files are opened with `FileShare.Read | FileShare.Delete` so admin tooling can replace them. - **TileData fingerprint via XxHash3.** The `.swb` header carries a hash of `LandTable + ItemTable` flags. Load rejects any file whose hash doesn't match the running server. Computed via `HashUtility.ComputeHash64` (engine-blessed hasher) — adds a `ReadOnlySpan<byte>` overload alongside the existing `ReadOnlySpan<char>` one for parity. - **`StepCache.SaveToFile(path, mapId)`** — writes resident chunks for the given map. - **`StepCache.TryOpenLazyReader(path, mapId)`** — opens the file, validates header, holds the reader for the map's lifetime. - **`StepCache.ResolveMissingChunk`** — now consults the lazy reader before invoking the runtime baker. A loaded chunk whose `BuiltMultisVersion` doesn't match the live sector falls through to the baker (snapshot was made before a multi was added/removed in that sector). - **`StepCache.Clear` closes lazy readers.** Test cleanup can delete `.swb` files cleanly. - **Auto-load at startup.** `PathCacheCommands.Configure()` opens `Data/Pathfinding/<mapId>.swb` as a lazy reader for every map. - **`[PathCacheSave`** / **`[PathCacheLoad`** — admin commands for the same workflow. - **`pathfinding.maxResidentChunks` shard-tunable.** Read from `server.cfg` at boot via `ServerConfiguration.GetOrUpdateSetting` (default 8192 ≈ 40 MB). Small shards can tune down; large shards with substantial bakes can tune up to reduce eviction churn. Default is written back to `server.cfg` on first boot, matching the engine pattern used by other settings. ## File layout (v1) ``` Header (48 bytes): u32 Magic = 0x42575300 ('SWB\0') u32 Version = 1 u32 MapId u64 TileDataHash XxHash3 over LandTable + ItemTable flags (HashUtility) u64 BakeTimestamp informational u32 ChunkCount u64 IndexOffset file position where the chunk index begins Chunk records (fixed size, ~5,393 bytes each, +32 if multi-Z): u16 ChunkX u16 ChunkY u32 BuiltMultisVersion u8 HasMultiZ byte WalkMask[256], WetMask[256] sbyte SourceZ[256], WalkZN..WalkZNW[256], SwimZN..SwimZNW[256] [byte MultiZCells[32] when HasMultiZ == 1] Index trailer (16 × ChunkCount bytes): (u64 chunkKey, u64 fileOffset) ``` ## Memory math | Scenario | Disk file | RAM at boot | Notes | |---|---|---|---| | Empty / no `.swb` files | — | 0 | Silent; cache builds on demand. | | Admin-curated towns (5K chunks) | 25 MB | 0 + per-query | Index ≈ 80 KB. Resident grows to the configured cap under steady-state queries. | | Full-map bake (50K chunks) | 250 MB | 0 + per-query | Index ≈ 800 KB. Same configured cap. Cold areas never load. | | All 5 maps fully baked | 1.25 GB | 0 + per-query | Index ≈ 4 MB total. Same configured cap. | ## Hash choice (FNV-1a → XxHash3) The original draft used inlined FNV-1a-64. Switched to XxHash3 via `HashUtility`: - ~30× faster on this workload (~30 GB/s SIMD vs ~2 GB/s byte-by-byte). Boot-time only, so absolute saving is microseconds — the real wins are elsewhere. - Stronger collision resistance and distribution. - Drops ~25 lines of inlined hash code; matches the rest of the codebase's hashing pattern. - Hash is stable as long as `HashUtility`'s `xxHash3Seed` constant doesn't change (already marked `// DO NOT CHANGE THIS NUMBER`).
This commit is contained in:
Kamron Batman
GitHub
parent
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commit
7c9215d97c
6 changed files with 861 additions and 4 deletions
408
Projects/UOContent/Engines/Pathing/Cache/StepCacheFile.cs
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Projects/UOContent/Engines/Pathing/Cache/StepCacheFile.cs
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using System;
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using System.Buffers.Binary;
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using System.Collections.Generic;
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using System.IO;
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using System.Runtime.InteropServices;
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namespace Server.Engines.Pathing.Cache;
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/// <summary>
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/// Binary serializer + lazy reader for the step cache. Persists chunk records to disk
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/// so a server warm-starts without paying chunk-build cost on the first pathfind through
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/// a region. Lazy: opening a file reads only the header + chunk-offset index (~few KB
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/// for tens of thousands of chunks), then individual chunks are seeked + deserialized
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/// only when the cache asks for them. RAM stays bounded by MaxResidentChunks regardless
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/// of file size.
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///
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/// File layout (little-endian, BufferWriter / BufferReader convention):
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///
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/// Header (48 bytes):
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/// u32 Magic = 0x42575300 ('SWB\0')
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/// u32 Version = current FormatVersion
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/// u32 MapId
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/// u64 TileDataHash XxHash3 over LandTable + ItemTable flags (via
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/// HashUtility); rejects a load when client tile data has
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/// shifted under us.
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/// u64 BakeTimestamp DateTime.UtcNow.Ticks at write time (informational).
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/// u32 ChunkCount
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/// u64 IndexOffset File position where the chunk index begins.
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///
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/// Per chunk (ChunkCount times, variable size):
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/// u16 ChunkX
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/// u16 ChunkY
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/// u32 BuiltMultisVersion
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/// u8 HasMultiZ 0 = no MultiZCells follow; 1 = 32 bytes of MultiZCells follow
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/// byte WalkMask[256]
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/// byte WetMask[256]
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/// sbyte SourceZ[256]
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/// sbyte WalkZN[256]..WalkZNW[256] (8 arrays in N,NE,E,SE,S,SW,W,NW order)
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/// sbyte SwimZN[256]..SwimZNW[256] (8 arrays in same order)
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/// [byte MultiZCells[32] — only when HasMultiZ == 1]
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///
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/// Index trailer (16 × ChunkCount bytes):
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/// For each chunk: { u64 chunkKey, u64 fileOffset }
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///
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/// Per-chunk size: ~5,393 bytes (no multi-Z) or ~5,425 bytes (with multi-Z).
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/// LRU bookkeeping (LastTouchedTicks) is intentionally not persisted.
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/// </summary>
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internal static class StepCacheFile
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{
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public const uint Magic = 0x42575300; // 'SWB\0'
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public const uint FormatVersion = 1;
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private const int HeaderSize =
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sizeof(uint) // Magic
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+ sizeof(uint) // Version
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+ sizeof(uint) // MapId
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+ sizeof(ulong) // TileDataHash
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+ sizeof(ulong) // BakeTimestamp
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+ sizeof(uint) // ChunkCount
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+ sizeof(ulong); // IndexOffset
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private const int IndexEntryBytes = sizeof(ulong) + sizeof(ulong); // chunkKey + offset
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private const int BytesPerChunkBase =
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sizeof(ushort) + sizeof(ushort) + sizeof(uint) + sizeof(byte)
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+ StepChunk.CellsPerChunk // WalkMask
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+ StepChunk.CellsPerChunk // WetMask
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+ StepChunk.CellsPerChunk // SourceZ
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+ 8 * StepChunk.CellsPerChunk // WalkZ[8]
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+ 8 * StepChunk.CellsPerChunk; // SwimZ[8]
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private const int BytesPerMultiZ = 32;
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/// <summary>
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/// Byte offset of the IndexOffset u64 within the header
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/// (Magic+Version+MapId+TileDataHash+BakeTimestamp+ChunkCount = 32). Patched after chunks land.
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/// </summary>
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private const int IndexOffsetFieldPosition = 32;
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public delegate bool ChunkEnumerator(out int chunkX, out int chunkY, out StepChunk chunk);
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/// <summary>
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/// Computes a stable hash of the loaded TileData flags via XxHash3 (HashUtility).
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/// Bake files carry this hash so a load can refuse to populate the cache when tile
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/// data has shifted (client patch, mismatched version) — mismatched data would
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/// silently skew walkability answers. Hash is stable as long as HashUtility's seed
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/// constant doesn't change.
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/// </summary>
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public static ulong ComputeTileDataHash()
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{
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var landTable = TileData.LandTable;
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var itemTable = TileData.ItemTable;
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// Project just the Flags ulong from each entry into a contiguous byte buffer.
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// The struct itself contains a string Name (reference) whose object identity isn't
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// stable across runs, so we can't MemoryMarshal.Cast the whole struct.
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var bytes = new byte[(landTable.Length + itemTable.Length) * sizeof(ulong)];
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var span = bytes.AsSpan();
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for (var i = 0; i < landTable.Length; i++)
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{
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BinaryPrimitives.WriteUInt64LittleEndian(span[(i * 8)..], (ulong)landTable[i].Flags);
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}
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var itemOffset = landTable.Length * 8;
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for (var i = 0; i < itemTable.Length; i++)
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{
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BinaryPrimitives.WriteUInt64LittleEndian(span[(itemOffset + i * 8)..], (ulong)itemTable[i].Flags);
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}
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return HashUtility.ComputeHash64(bytes);
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}
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/// <summary>
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/// Writes the file: header (with placeholder IndexOffset) → chunks (offsets recorded)
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/// → index trailer → patches the header IndexOffset. <paramref name="chunkCount"/> must
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/// equal the actual number of chunks <paramref name="next"/> will yield.
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/// </summary>
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public static void Write(string path, uint mapId, uint chunkCount, ChunkEnumerator next)
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{
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Directory.CreateDirectory(Path.GetDirectoryName(path) ?? ".");
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var capacity = HeaderSize
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+ (BytesPerChunkBase + BytesPerMultiZ) * (int)chunkCount
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+ IndexEntryBytes * (int)chunkCount;
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var buffer = new byte[capacity];
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var w = new BufferWriter(buffer, prefixStr: false);
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w.Write(Magic);
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w.Write(FormatVersion);
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w.Write(mapId);
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w.Write(ComputeTileDataHash());
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w.Write((ulong)DateTime.UtcNow.Ticks);
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w.Write(chunkCount);
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w.Write(0UL); // IndexOffset placeholder, patched after chunks
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var indexEntries = new (ulong key, ulong offset)[chunkCount];
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var written = 0u;
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while (next(out var chunkX, out var chunkY, out var chunk))
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{
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if (written >= chunkCount)
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{
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throw new InvalidOperationException(
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$"StepCacheFile.Write: enumerator yielded more than the declared {chunkCount} chunks"
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);
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}
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var chunkOffset = (ulong)w.Position;
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WriteChunk(w, chunkX, chunkY, chunk);
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indexEntries[written] = (PackChunkKey(chunkX, chunkY), chunkOffset);
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written++;
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}
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if (written != chunkCount)
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{
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throw new InvalidOperationException(
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$"StepCacheFile.Write: declared {chunkCount} chunks but enumerator yielded {written}"
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);
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}
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var indexOffset = (ulong)w.Position;
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for (var i = 0u; i < chunkCount; i++)
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{
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w.Write(indexEntries[i].key);
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w.Write(indexEntries[i].offset);
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}
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// Patch IndexOffset directly into the buffer (BufferWriter has no Seek).
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BinaryPrimitives.WriteUInt64LittleEndian(buffer.AsSpan(IndexOffsetFieldPosition, 8), indexOffset);
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var totalBytes = (int)w.Position;
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File.WriteAllBytes(path, buffer.AsSpan(0, totalBytes).ToArray());
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}
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/// <summary>
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/// Opens a .swb file and reads only its header + chunk-offset index. Returns null on
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/// missing file, magic / version mismatch, or TileDataHash mismatch (a stale bake
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/// against a freshly patched client). Callers own disposal of the returned reader.
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/// </summary>
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public static LazyReader OpenForLazy(string path)
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{
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if (!File.Exists(path))
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{
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return null;
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}
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FileStream stream = null;
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try
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{
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stream = new FileStream(
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path,
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FileMode.Open,
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FileAccess.Read,
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FileShare.Read | FileShare.Delete
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);
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Span<byte> headerBuf = stackalloc byte[HeaderSize];
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if (stream.Read(headerBuf) != HeaderSize)
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{
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stream.Dispose();
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return null;
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}
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var magic = BinaryPrimitives.ReadUInt32LittleEndian(headerBuf);
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if (magic != Magic)
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{
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stream.Dispose();
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return null;
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}
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var version = BinaryPrimitives.ReadUInt32LittleEndian(headerBuf[4..]);
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if (version != FormatVersion)
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{
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stream.Dispose();
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return null;
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}
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var mapId = BinaryPrimitives.ReadUInt32LittleEndian(headerBuf[8..]);
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var tileDataHash = BinaryPrimitives.ReadUInt64LittleEndian(headerBuf[12..]);
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var bakeTimestamp = BinaryPrimitives.ReadUInt64LittleEndian(headerBuf[20..]);
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var chunkCount = BinaryPrimitives.ReadUInt32LittleEndian(headerBuf[28..]);
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var indexOffset = BinaryPrimitives.ReadUInt64LittleEndian(headerBuf[32..]);
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if (tileDataHash != ComputeTileDataHash())
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{
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stream.Dispose();
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return null;
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}
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// Read the chunk-offset index in one shot.
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var indexBytes = (int)chunkCount * IndexEntryBytes;
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var indexBuf = new byte[indexBytes];
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stream.Position = (long)indexOffset;
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if (stream.Read(indexBuf, 0, indexBytes) != indexBytes)
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{
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stream.Dispose();
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return null;
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}
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var offsets = new Dictionary<ulong, ulong>((int)chunkCount);
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for (var i = 0; i < chunkCount; i++)
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{
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var entry = indexBuf.AsSpan(i * IndexEntryBytes);
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var key = BinaryPrimitives.ReadUInt64LittleEndian(entry);
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var off = BinaryPrimitives.ReadUInt64LittleEndian(entry[8..]);
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offsets[key] = off;
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}
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return new LazyReader(stream, mapId, tileDataHash, bakeTimestamp, chunkCount, offsets);
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}
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catch
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{
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stream?.Dispose();
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return null;
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}
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}
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private static ulong PackChunkKey(int chunkX, int chunkY) => ((ulong)(uint)chunkX << 32) | (uint)chunkY;
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private static void WriteChunk(BufferWriter w, int chunkX, int chunkY, StepChunk chunk)
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{
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w.Write((ushort)chunkX);
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w.Write((ushort)chunkY);
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w.Write((uint)chunk.BuiltMultisVersion);
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var multiZ = chunk.GetMultiZCellsForSerialization();
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w.Write((byte)(multiZ != null ? 1 : 0));
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w.Write(chunk.WalkMask);
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w.Write(chunk.WetMask);
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WriteSBytes(w, chunk.SourceZ);
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WriteSBytes(w, chunk.WalkZN);
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WriteSBytes(w, chunk.WalkZNE);
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WriteSBytes(w, chunk.WalkZE);
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WriteSBytes(w, chunk.WalkZSE);
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WriteSBytes(w, chunk.WalkZS);
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WriteSBytes(w, chunk.WalkZSW);
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WriteSBytes(w, chunk.WalkZW);
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WriteSBytes(w, chunk.WalkZNW);
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WriteSBytes(w, chunk.SwimZN);
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WriteSBytes(w, chunk.SwimZNE);
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WriteSBytes(w, chunk.SwimZE);
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WriteSBytes(w, chunk.SwimZSE);
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WriteSBytes(w, chunk.SwimZS);
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WriteSBytes(w, chunk.SwimZSW);
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WriteSBytes(w, chunk.SwimZW);
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WriteSBytes(w, chunk.SwimZNW);
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if (multiZ != null)
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{
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w.Write(multiZ);
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}
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}
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private static StepChunk ReadChunk(byte[] buffer)
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{
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var r = new BufferReader(buffer);
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// Skip ChunkX + ChunkY (already known via the index lookup).
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r.ReadUShort();
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r.ReadUShort();
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var multisVersion = (int)r.ReadUInt();
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var hasMultiZ = r.ReadByte() != 0;
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var chunk = new StepChunk { BuiltMultisVersion = multisVersion };
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r.Read(chunk.WalkMask);
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r.Read(chunk.WetMask);
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ReadSBytes(r, chunk.SourceZ);
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ReadSBytes(r, chunk.WalkZN);
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ReadSBytes(r, chunk.WalkZNE);
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ReadSBytes(r, chunk.WalkZE);
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ReadSBytes(r, chunk.WalkZSE);
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ReadSBytes(r, chunk.WalkZS);
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ReadSBytes(r, chunk.WalkZSW);
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ReadSBytes(r, chunk.WalkZW);
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ReadSBytes(r, chunk.WalkZNW);
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ReadSBytes(r, chunk.SwimZN);
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ReadSBytes(r, chunk.SwimZNE);
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ReadSBytes(r, chunk.SwimZE);
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ReadSBytes(r, chunk.SwimZSE);
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ReadSBytes(r, chunk.SwimZS);
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ReadSBytes(r, chunk.SwimZSW);
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ReadSBytes(r, chunk.SwimZW);
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ReadSBytes(r, chunk.SwimZNW);
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if (hasMultiZ)
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{
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var multiZ = new byte[BytesPerMultiZ];
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r.Read(multiZ);
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chunk.RestoreMultiZCellsFromSerialization(multiZ);
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}
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return chunk;
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}
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private static void WriteSBytes(BufferWriter w, sbyte[] arr) =>
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w.Write(MemoryMarshal.Cast<sbyte, byte>(arr.AsSpan()));
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private static void ReadSBytes(BufferReader r, sbyte[] arr) =>
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r.Read(MemoryMarshal.Cast<sbyte, byte>(arr.AsSpan()));
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/// <summary>
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/// Open handle on a .swb file. Holds the FileStream + chunk-offset index. Chunks are
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/// fetched on demand via <see cref="TryReadChunk"/>; only the records actually queried
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/// are ever materialized. Dispose releases the underlying stream.
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/// </summary>
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internal sealed class LazyReader : IDisposable
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{
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private FileStream _stream;
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private readonly Dictionary<ulong, ulong> _offsets;
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private byte[] _buffer;
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public uint MapId { get; }
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public ulong TileDataHash { get; }
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public ulong BakeTimestamp { get; }
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public uint ChunkCount { get; }
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public int IndexedChunkCount => _offsets.Count;
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public bool Has(int chunkX, int chunkY) => _offsets.ContainsKey(PackChunkKey(chunkX, chunkY));
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internal LazyReader(
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FileStream stream, uint mapId, ulong tileDataHash, ulong bakeTimestamp,
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uint chunkCount, Dictionary<ulong, ulong> offsets
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)
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{
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_stream = stream;
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MapId = mapId;
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TileDataHash = tileDataHash;
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BakeTimestamp = bakeTimestamp;
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ChunkCount = chunkCount;
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_offsets = offsets;
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_buffer = new byte[BytesPerChunkBase + BytesPerMultiZ];
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}
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/// <summary>
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/// Returns the chunk record at (<paramref name="chunkX"/>, <paramref name="chunkY"/>)
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/// from the file, or null if the file doesn't contain it. Single seek + bulk read;
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/// no allocations beyond the returned StepChunk and its arrays.
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/// </summary>
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public StepChunk TryReadChunk(int chunkX, int chunkY)
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{
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if (_stream == null)
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{
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return null;
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}
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var key = PackChunkKey(chunkX, chunkY);
|
||||
if (!_offsets.TryGetValue(key, out var offset))
|
||||
{
|
||||
return null;
|
||||
}
|
||||
|
||||
_stream.Position = (long)offset;
|
||||
// Try to read the maximum size; the file may have less remaining, which is OK
|
||||
// since BufferReader stops at the bytes it actually needs.
|
||||
var read = _stream.Read(_buffer, 0, _buffer.Length);
|
||||
return read < BytesPerChunkBase ? null : ReadChunk(_buffer);
|
||||
}
|
||||
|
||||
public void Dispose()
|
||||
{
|
||||
_stream?.Dispose();
|
||||
_stream = null;
|
||||
_buffer = null;
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue