Highly Performant & Scalable Ultima Online Server Emulator
https://www.modernuo.com
c-sharpcsharpcsharp-coredotnetdotnet-coreemulatorgplgplv3mmommo-enginemmorpgmmorpg-serveronlinerpgrunuoserverservuoultimaultima-onlineuo
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Replaces the per-entity round-robin ConcurrentQueue handoff between the game loop and the serialization workers with pooled 4096-entity chunks published to a single shared queue. The producer's per-entity cost drops from a synchronized enqueue to a plain array store, and workers pulling whole chunks load-balance dynamically: a worker busy with a thick entity simply takes fewer chunks. Scheduling changes so indivisible multi-megabyte payloads no longer extend the freeze tail: - Persistence.SerializeAll pushes systems largest-first (LPT), using the previous save's SerializedLength (or the loaded file size on first save). - Persistence self-payloads and entities whose previous size exceeds 1MB are published as dedicated single-entity chunks so they spread across workers instead of riding inside one shared chunk. - Entity SerializedLength is stamped from the index at load so estimates exist on the first save after boot. Worker heaps are pre-sized from the loaded save's .bin sizes (25% headroom) so the first save doesn't pay copy-on-grow inside the freeze, and the drain loop uses SpinWait backoff (never Sleep(1)) instead of hammering the queue head while the producer works. Snapshot writing uses a 1MB FileStream buffer, and per-worker entity/byte counts are logged at Debug for balance diagnostics. Measured on a 24-core machine with a synthetic 10M-entity, 1.7GB world (64/64/32MB system payloads, 24x 2MB thick entities) through the real pipeline classes: freeze window 740ms -> 122-160ms steady state (~5-6x), first save 490ms -> 330ms, steady-state allocations converge to zero, and worker byte loads converge (previous max/min spread ~2x -> ~1.15x for the small-entity stream). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> |
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| branding | ||
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| Distribution/Data | ||
| Projects | ||
| .cursorrules | ||
| .editorconfig | ||
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| .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, AlmaLinux, Rocky, etc
dnf upgrade --refresh -y
# RHEL-family distributions (CentOS Stream, AlmaLinux, Rocky, RHEL) need CRB and EPEL enabled.
# Fedora skips this block.
dnf install -y dnf-plugins-core
dnf config-manager --set-enabled crb
dnf install -y epel-release
# Prerequisites
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