setup.sh

#!/bin/bash

# variables
MINECRAFT_VERSION=1.21
FABRIC_LOADER_VERSION=0.15.11
FABRIC_INSTALLER_VERSION=1.0.1

ALLOCATED_MEMORY=4096M

# download fabric installer
curl -so "server.jar" "https://meta.fabricmc.net/v2/versions/loader/${MINECRAFT_VERSION}/${FABRIC_LOADER_VERSION}/${FABRIC_INSTALLER_VERSION}/server/jar"

# run server using aikar flags
java \
  -Xms${ALLOCATED_MEMORY} \
  -Xmx${ALLOCATED_MEMORY} \
  --add-modules=jdk.incubator.vector \
  -XX:+UseG1GC \
  -XX:+ParallelRefProcEnabled \
  -XX:MaxGCPauseMillis=200 \
  -XX:+UnlockExperimentalVMOptions \
  -XX:+DisableExplicitGC \
  -XX:+AlwaysPreTouch \
  -XX:G1HeapWastePercent=5 \
  -XX:G1MixedGCCountTarget=4 \
  -XX:InitiatingHeapOccupancyPercent=15 \
  -XX:G1MixedGCLiveThresholdPercent=90 \
  -XX:G1RSetUpdatingPauseTimePercent=5 \
  -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem \
  -XX:MaxTenuringThreshold=1 \
  -Dusing.aikars.flags=https://mcflags.emc.gs \
  -Daikars.new.flags=true -XX:G1NewSizePercent=30 \
  -XX:G1MaxNewSizePercent=40 \
  -XX:G1HeapRegionSize=8M \
  -XX:G1ReservePercent=20 \
  -jar server.jar --nogui