?
Host a serverModrinth App
Sign in
ModsResource PacksData PacksShadersModpacksPluginsServers
Settings
EZvac

EZvac

HVAC and indoor-climate simulation plugin for Paper/Purpur (ALPHA). Free and open source.

99downloads
0followers
99downloads
0followers

Links

Report issues View source Join Discord server

Tags

Creators

Details

Licensed MIT
Published 3 weeks ago
Updated 6 hours ago
All versions

ALPHA-1.5

Alpha
EZvac ALPHA-1.5last month 9
Uploaded by
Download

Compatibility

Minecraft: Java Edition
1.21–1.21.1
Platforms
Paper
Purpur

Changes

Performance overhaul of ALPHA 1.1 HOTFIX. No new devices, commands, or configuration options — every change is to when and how often work happens, not to what the simulation does.

Performance

Measured on Paper 1.21.1 against ALPHA 1.1 HOTFIX with identical worlds and workloads:

Scenario 1.1 HOTFIX 1.5 Change
555 devices / 150 groups, average tick work 1.552 ms 0.515 ms −67%
555 devices, worst single tick 118 ms 64 ms −45%
5 devices with continuous airflow churn 0.863 ms 0.575 ms −33%

At 555 devices the controller previously spent roughly 23 ms inside a single tick, once per second — the kind of periodic hitch players feel as a stutter.

Three main-thread stalls were removed:

  • Registry saves blocked the tick for 12–65 ms depending on device count. The snapshot is still built on the main thread (~1 ms); the YAML dump and file replacement now run off it.
  • Airflow rebuild completion copied the whole distance map, costing up to 42 ms in a single tick at the configured cell cap.
  • Chunk streaming drove the controller at up to 20 Hz instead of its configured period whenever players were loading chunks.

Airflow systems also use about 2.3× less memory each.

Behaviour changes

  • Airflow rebuilds are debounced. A vent system waits 20 ticks after its last change before rebuilding, with a 200-tick ceiling. In practice airflow reacts about a second after a door moves rather than instantly. This also fixes a case where a door on a redstone clock could consume the entire node budget every tick and never finish a usable airflow map.
  • Chunk-load reconciliation is deferred by up to one controller period.

Upgrading from ALPHA 1.1 HOTFIX

Drop-in. Replace the jar and restart — no migration, no config changes.

  • hvac.yml format is unchanged (version 5)
  • config.yml and all tuning options are unchanged
  • Rolling back to 1.1 works; the state file stays readable by it
  • Verified for both a clean restart and a crash restart with machines running and fluid outputs owned
  • Verified on Paper 1.21.1 and Purpur 1.21.1

As always with alpha software, back up your world and plugins/EZvac/hvac.yml first. After starting, /hvac list should show all your systems, and the log should be free of Could not save hvac.yml.

Licensing

EZvac moves from The Unlicense to the MIT License starting with this release. Releases through ALPHA 1.1 HOTFIX remain dedicated to the public domain — that dedication is irrevocable. Contributions are now accepted under MIT with no CLA; see CONTRIBUTING.md.

Requirements

Paper 1.21.1 or a Paper fork such as Purpur, and Java 21.