Highly Performant & Scalable Ultima Online Server Emulator
https://www.modernuo.com
c-sharpcsharpcsharp-coredotnetdotnet-coreemulatorgplgplv3mmommo-enginemmorpgmmorpg-serveronlinerpgrunuoserverservuoultimaultima-onlineuo
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BuildChunk accumulated packed multi-Z strata into a List<byte>, which grew by doubling (256 -> 512 -> 1024 -> ...) and then paid a final ToArray(). A full map bake runs this ~114k times. It now writes into a byte[] rented from STArrayPool<byte>.Shared via a WriteStratum span writer, and hands the chunk a single exact-size copy. This required tightening the record-fit guard. It reserved headroom for 8 strata (StratumByteLength * 8) while ComputeStandableSurfaceZs can return up to 16, so a cell could write 305 bytes past a 65,383-byte offset. Against a List that was benign - it just grew past 64KB, and offsets stayed under the NoStrata sentinel. Against a fixed-size rented buffer it is an out-of-bounds write. The guard is now exact (strataLen + recordLength <= NoStrata), which also proves no emitted offset can collide with the NoStrata == ushort.MaxValue sentinel. Also: - ShouldPromoteAfterMiss did two dictionary lookups per miss (TryGetValue, then an indexer assignment that re-hashes and re-probes). It now mutates the entry in place through CollectionsMarshal.GetValueRefOrNullRef. This runs on every uncached chunk touch during A* expansion, so it is the one change here that lands on the query path. The window-expiry branch keeps its explicit early return so threshold=1 still resets rather than promoting. - Drop StepProbe.ComputeStrataAt and ComputedStratum. Dead code, and the last per-call array allocation in the probe. - Collapse six 18-argument `new StepMask(0, 0, ..., kind)` blocks into Fallthrough(kind), and the thrice-repeated telemetry switch into RecordServed(kind). No behavior change; TryGetMask goes from ~220 to ~90 lines. TryGetMask itself was already allocation-free (StepMask is a readonly struct, StaticTileEnumerable is a ref struct, ChunkMissState is a struct), so this is a bake-throughput and GC-churn win rather than a query-latency one. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> |
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| branding | ||
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| Distribution/Data | ||
| Projects | ||
| .cursorrules | ||
| .editorconfig | ||
| .gitattributes | ||
| .gitignore | ||
| AGENTS.md | ||
| azure-pipelines.yml | ||
| CLAUDE.md | ||
| CODE_OF_CONDUCT.md | ||
| CONTRIBUTING.md | ||
| Directory.Build.props | ||
| FAQ.md | ||
| GEMINI.md | ||
| global.json | ||
| LICENSE | ||
| ModernUO.slnx | ||
| publish.cmd | ||
| publish.ps1 | ||
| publish.sh | ||
| README.md | ||
| rider-settings.zip | ||
| Rules.ruleset | ||
| SPONSORS.md | ||
| stylecop.json | ||
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| version.json | ||
ModernUO 
Ultima Online Server Emulator for the modern era!
Requirements
Supported Operating Systems
Required Frameworks
All Operating Systems
Windows
Development
Supported IDEs
Getting Started
- Install prerequisite requirements
- Clone this repository (or download the latest):
git clone https://github.com/modernuo/ModernUO.git
- Open
ModernUO.slnto start developing
Building/Publishing
Interactive Mode (Recommended for new users)
Run ./publish.cmd (Windows) or ./publish.sh (Linux/macOS) with no arguments to launch the guided build tool. It will:
- Check prerequisites (.NET SDK, native libraries)
- Walk you through configuration and platform selection
- Build and publish the server to the
Distributiondirectory - Show deployment instructions for cross-compiled builds
Command Line
./publish.cmd [release|debug] [os] [arch]
os- Supported operating systemsarchx64- Intel/AMD 64-bitarm64- ARM 64-bit
Linux Prerequisites
Fedora, CentOS, RHEL, etc
dnf upgrade --refresh -y
# CentOS does not come with EPEL enabled
dnf install -y epel-release epel-next-release
dnf install -y findutils libicu libdeflate-devel zstd libargon2-devel liburing-devel
Ubuntu, Debian, etc
apt-get update -y
apt-get install -y libicu-dev libdeflate-dev zstd libargon2-dev liburing-dev
OSX Requirements
brew install icu4c libdeflate zstd argon2
Running the Server
- Follow the publish instructions
- The
Distributiondirectory is portable — copy it to your production server for deployment - Run
ModernUO.exeordotnet ModernUO.dllfrom theDistributiondirectory - On first run, the server will prompt you to configure game data file locations
Troubleshooting / FAQ
- See FAQ
Want to sponsor?
Thank you for supporting us! You can find out how by visiting the sponsors page.
Collaborators
Thanks
- RunUO Team & Community
- Voxpire, the ServUO Team & Community
- Karasho, Jaedan and the ClassicUO Community
Development Tools & Plugins provided with ♥ by
Code Signing Policy
Free code signing provided by SignPath.io, certificate by SignPath Foundation.
This program will not transfer any information to other networked systems unless specifically requested by the user or the person installing or operating it
Teams & Roles
Approvers & Committers: Development Team