Highly Performant & Scalable Ultima Online Server Emulator
https://www.modernuo.com
c-sharpcsharpcsharp-coredotnetdotnet-coreemulatorgplgplv3mmommo-enginemmorpgmmorpg-serveronlinerpgrunuoserverservuoultimaultima-onlineuo
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Removes the per-entity handoff from the freeze entirely. GenericEntityPersistence publishes 4096-slot ranges over its dictionary's backing entries array, and workers serialize occupied slots (value != null) directly via a ShadowEntry<TValue> struct that mirrors the runtime's private Dictionary Entry layout. Safe because the dictionary is frozen during Saving (mutations divert to the pending safety queues). The layout is proven at startup before any code reads through it: validation measures the true Entry stride via precise allocation accounting (so all shadow reads are guaranteed in-bounds), then compares every key and value of a churned, resized, freelist-exercised dictionary reading value slots as raw pointer bits only - never materializing a managed reference until the layout is proven. If a future runtime changes Dictionary internals, validation fails and saves fall back to the enumerate-and-push path with a logged warning. The main thread now joins the drain through an inline (threadless) worker after publishing work, instead of idling while the thread workers finish - worth a full worker share on the freeze and proportionally more on low-core hosts. Measured through the real pipeline classes (24 cores, 10M entities, 1.7GB, dense 2-byte write profile): publish cost drops from ~55ms to ~0.1ms, the freeze is now bound by pure serialize throughput at ~99ms steady state (vs ~740ms before this branch, ~7.5x), and the first save after boot drops from ~468ms to ~139ms because fine-grained ranges self-balance without needing size estimates. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> |
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| publish.sh | ||
| README.md | ||
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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