Hibernate MC

Hibernate MC

Lets your Minecraft Fabric or NeoForge server snooze when idle, slashing CPU usage without missing a block!

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Download from:		Supported loaders:

📖 About

Hibernate MC is a lightweight tool that automatically puts your Minecraft Fabric or NeoForge server to sleep when no players are online. By reducing CPU usage during idle times, it helps save server resources, lowers your electricity bill, and makes your server more eco-friendly. It's a simple way to keep your Minecraft world running smoothly without wasting power when it's not needed.

Hibernate MC can also be used in singleplayer. When used in singleplayer, you can use the /hibernate commands (Ops only) and the entity removal feature works if enableMemoryOptimization is enabled in the config. No other features work in singleplayer as they only function when no players are online which can't happen in singleplayer.

📦 Dependencies

For Fabric:

For NeoForge:

N/A

🎮 Install & Play

Installing Hibernate MC is easy:

1. Download the latest version for your loader and Minecraft version here.
2. Put the downloaded jar file in to your mods folder.
3. Launch Minecraft and play with the mod.

If installing on a server, don't forget to set pause-when-empty-seconds to 0 in your server.properties file to disable the vanilla hibernation system.

📜 Support Policy

The project supports the Minecraft version for which the mod is initially developed for, along with the next two major Minecraft versions. Versions released prior to the initial supported version are not supported.

Once a Minecraft version falls outside the three-version active support window, it enters Bug-Fixes-Only support for the duration of the following major version. During this period, only critical or game-breaking issues directly related to the project will be addressed. New features, enhancements, and non-critical changes will not be backported to versions in this stage.

Once a version leaves Bug-Fixes-Only support, it becomes Unsupported. Unsupported versions will receive no further updates, fixes, or compatibility changes.

Minecraft version	Supported status
26.3	Supported
26.2	Supported
26.1	Supported
1.21.11	Bugs Only
1.21.9	Unsupported

📝 Config

The config file can be found at /config/hibernate_mc.json from the root of the .minecraft folder or your server folder.

⚙️ Options

Basic Settings

Setting	Default	Description
startEnabled	true	Whether hibernation activates automatically when server starts with no players
ticksToSkip	400	Number of ticks to process before applying sleep during hibernation
permissionLevel	2	Required permission level to use hibernation commands (0=all, 4=owner)
sleepTimeMs	75	Milliseconds to sleep between tick processing cycles

Memory Optimization

Setting	Default	Description
enableMemoryOptimization	true	Enable memory cleanup during hibernation
memoryCleanupIntervalSeconds	30	How often to run memory cleanup routines
memoryThresholdPercent	80.0	Memory usage percentage that triggers cleanup
forceGarbageCollection	true	Force Java garbage collection during hibernation
gcIntervalSeconds	30	Minimum time between garbage collection runs
saveBeforeHibernation	true	Save world data before entering hibernation
removeEntities	item, firework_rocket, arrow, experience_orb	List of entities to remove during hibernation (ignores entities with custom names)
droppedItemMaxAgeSeconds	300	Age in seconds after which items are removed (5 minutes)
logMemoryInfo	false	Log memory usage and garbage collector information to console

CPU Optimization

Setting	Default	Description
aggressiveCpuSaving	true	Enable more aggressive CPU saving measures
minSleepInterval	1500	Minimum time in milliseconds between sleep cycles
highLoadSleepMultiplier	1.5	Multiplier for sleep time when system load is high
yieldInterval	8	How often to yield CPU to other threads (every N ticks)

Gamerule Values When The Servers Awake

Setting	Default	Description
advance_time	true	The value to set the gamerule advance_time to when coming out of hibernation
advance_weather	true	The value to set the gamerule advance_weather to when coming out of hibernation
random_tick_speed	3	The value to set the gamerule random_tick_speed to when coming out of hibernation
spawn_mobs	true	The value to set the gamerule spawn_mobs to when coming out of hibernation
fire_spread_radius_around_player	128	The value to set the gamerule fire_spread_radius_around_player to when coming out of hibernation

Gamerule Values When The Servers Hibernating

Setting	Default	Description
advance_time	false	The value to set the gamerule advance_time to when going into hibernation
advance_weather	false	The value to set the gamerule advance_weather to when going into hibernation
random_tick_speed	0	The value to set the gamerule random_tick_speed to when going into hibernation
spawn_mobs	false	The value to set the gamerule spawn_mobs to when going into hibernation
fire_spread_radius_around_player	0	The value to set the gamerule fire_spread_radius_around_player to when going into hibernation

👨‍💻 Developing

Are you a developer and want to develop for this mod?

To get a local copy up and running, follow these simple steps.

🧰 Prerequisites

Ensure you have the following installed on your machine:

• Java Development Kit (JDK): Version 25 or higher.
  • Download JDK
• Gradle: Version 9.7.1 or higher.
  • Install Gradle
• Minecraft: Version 26.3

🛠️ Build

1. Clone the repository

git clone https://codeberg.org/VoxelBill/hibernate-mc.git

2. Navigate to the project directory

cd hibernate-mc

3. Build the project with Gradle

./gradlew clean build

You can find the built mod at hibernate-mc/<loader>/build/libs/hibernate_mc-<loader>-x.x.x+mc2x.x.jar.

⚖️ License

Distributed under the GNU Lesser General Public License v3.0 only (LGPL-3.0-only).

This project is a fork of Hibernateforge which was distributed under the European Union Public License v1.2 (EUPL-1.2). Relicensing has been done in accordance with the compatibility clause of the EUPL (Article 5).

See LICENSE for more information.