Highly Performant & Scalable Ultima Online Server Emulator
https://www.modernuo.com
c-sharpcsharpcsharp-coredotnetdotnet-coreemulatorgplgplv3mmommo-enginemmorpgmmorpg-serveronlinerpgrunuoserverservuoultimaultima-onlineuo
f4327e6a3a
Converts BaseCreature's hand-written v22 serialization to codegen v23. Nearly every field sits behind a [SaveFlag], so a creature matching its defaults writes only [version int][ulong flags][default AI] - 13 bytes - instead of ~236, and the writer's work is mostly branch-not-taken. With 500k-1M creatures in a world, this is the dominant slice of mobile save freeze time and disk. - Speeds serialize only when they differ from the creature's npc-speeds values (GetSpeeds/GetMoveSpeeds on both the flag check and the load default), so table edits now reach existing unmodified spawns on restart, and former paragons (snapped back to table values) elide fully. CurrentSpeed writes only when it differs from PassiveSpeed. - The delete countdown is a [DeserializeTimer] field (anchored); stabled/controlled pets never persist one, and the abandoned-pet 3-day fallback lives in AfterDeserialization for both load paths. - SummonEnd stays anchored, written only while summoned. - Old saves (v0-22) load through the retained legacy Deserialize(reader, version), now assigning raw fields; the shared post-load fixups (stat timers, AI creation, followers, animate-dead registration, unsummon timer) moved to [AfterDeserialization]. - Side-effect setters became generated-field hooks (Team, Controlled, Summoned, Loyalty clamp, resistance seeds, CurrentSpeed); properties whose semantics the hooks cannot express stay hand-written as [SerializableProperty] (ControlMaster/SummonMaster bracket the assignment with follower bookkeeping, ControlOrder must run on equal re-assignment, Tamable/IsParagon/move speeds have custom getters). - CreatureDeathEvent/CreatureDeletedEvent moved to a CreatureEvents host class: the events generator and the serialization generator each emit a [GeneratedCode] partial for the declaring type, and the attribute forbids duplicates (CS0579). - m_ fields renamed to _camelCase. Tests: new-format round trips (default and fully populated) with exact byte consumption, back-to-back saves byte-identical, and a byte-authentic fossilized v22 stream loading through the legacy path. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> |
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| Distribution/Data | ||
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| tools | ||
| .cursorrules | ||
| .editorconfig | ||
| .gitattributes | ||
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| AGENTS.md | ||
| azure-pipelines.yml | ||
| CLAUDE.md | ||
| CODE_OF_CONDUCT.md | ||
| CONTRIBUTING.md | ||
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| 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
Hardware
| Use | vCPU | RAM | Storage |
|---|---|---|---|
| Development / test | 2 dedicated | 2 GB | SSD |
| Small live shard (< 50 concurrent) | 4 dedicated | 4 GB | NVMe |
| Medium (50–200) | 4–8 | 8 GB | NVMe |
| Large (200+) | 8+, high clock | 16 GB+ | NVMe |
See dev-docs/server-requirements.md for more information.
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 libargon2 tzdata
Ubuntu, Debian, etc
apt-get update -y
# The ICU runtime package carries the ABI version in its name (libicu74, libicu76, …) and has no
# stable alias, so match it by pattern rather than pinning a release-specific name.
apt-get install -y '^libicu[0-9]+$' libdeflate0 libargon2-1 tzdata
Only the runtime libraries are needed — the -dev/-devel packages are not. Run
./build-tool --check-prereqs to check the current machine and print the exact packages your
release needs.
zstd is not listed because ZstdNet bundles libzstd for every platform, and liburing is not
listed because IORingGroup issues io_uring syscalls directly.
If the shard's configured time zone is a legacy alias such as US/Eastern, Debian 12 and Ubuntu
24.04 also need tzdata-legacy. See Platform Prerequisites
for what each dependency is for and what breaks without it.
OSX Requirements
brew install icu4c libdeflate 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