Highly Performant & Scalable Ultima Online Server Emulator
https://www.modernuo.com
c-sharpcsharpcsharp-coredotnetdotnet-coreemulatorgplgplv3mmommo-enginemmorpgmmorpg-serveronlinerpgrunuoserverservuoultimaultima-onlineuo
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Every ISerializable carried SerializedThread/SerializedPosition/SerializedLength so WriteSnapshot could gather each entity's bytes from the worker heaps in dictionary order. The idx records absolute positions, so bin order is free - the snapshot can be written in worker-heap order instead, and the join inverts: - Chunks are persistence-homogeneous: SerializeAll declares the owner at each boundary, publishing the partial chunk on change. - Workers log segments (owner, slot range, heap start) plus one length per record as they serialize. Positions are implicit because a worker's writes are contiguous; identity comes from re-walking the same snapshot slots in the same order (guaranteed stable - mutations divert to the pending queues until PostWorldSave), or from an entities log on the fallback path. - WriteSnapshot routes segments by owner, emits idx entries during the re-walk, and writes each segment's heap bytes as a single span instead of one copy per entity, which also speeds up the background write phase. - Persistence self-payloads keep placement as three private fields on the ~dozens of persistence instances; PushSingle is now typed accordingly. Net effect: 9 bytes (plus padding) of resident state removed from every item, mobile, guild, and account on every shard; three interface-property stores per entity leave the drain hot path (stamping dirtied one cache line per entity mid-freeze - the lengths log is a single sequential stream); and the vestigial loader-side length stamp is gone. The transient cost is ~4 bytes per entity in pooled per-worker logs that are released after each write. The save format is unchanged (idx v3, same loader); only the write-side mechanics moved. Adds an end-to-end round-trip test that drives real workers through the chunk source, snapshots from the segment logs, and reloads. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> |
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| AGENTS.md | ||
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| FAQ.md | ||
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| global.json | ||
| LICENSE | ||
| ModernUO.slnx | ||
| publish.cmd | ||
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| publish.sh | ||
| README.md | ||
| rider-settings.zip | ||
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| SPONSORS.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