Initial commit.

entrypoint.sh

@@ -0,0 +1,56 @@
+#!/bin/bash
+
+set -eu
+
+memory_heuristic () {
+	if [[ -v memory_heuristic_cache ]]; then
+		echo $memory_heuristic_cache
+		return
+	fi
+
+	local total_memory=$(free | awk  '/Mem:/{print $2}')
+
+	# Below 8 GB we assume this is running on a dedicated server, so we
+	# allocate all but 10mb of the RAM. Otherwise allocate 30%. This is not
+	# based on any profiling or testing
+	if [[ total_memory -lt 8388608 ]]; then
+		memory_heuristic_cache=$((total_memory - 10240))
+	else
+		memory_heuristic_cache=$((total_memory * 3/10))
+	fi
+
+	memory_heuristic_cache+=k
+
+	echo $memory_heuristic_cache
+}
+
+# https://docs.papermc.io/paper/aikars-flags
+args=()
+args+=("-Xms$(memory_heuristic)")
+args+=("-Xmx$(memory_heuristic)")
+args+=("-XX:+UnlockExperimentalVMOptions")
+args+=("-XX:+ParallelRefProcEnabled")
+args+=("-XX:+DisableExplicitGC")
+args+=("-XX:+AlwaysPreTouch")
+args+=("-XX:+PerfDisableSharedMem")
+args+=("-XX:MaxGCPauseMillis=200")
+args+=("-XX:InitiatingHeapOccupancyPercent=15")
+args+=("-XX:SurvivorRatio=32")
+args+=("-XX:MaxTenuringThreshold=1")
+# G1 options
+args+=("-XX:+UseG1GC")
+args+=("-XX:G1NewSizePercent=30")
+args+=("-XX:G1MaxNewSizePercent=40")
+args+=("-XX:G1HeapRegionSize=8M")
+args+=("-XX:G1ReservePercent=20")
+args+=("-XX:G1HeapWastePercent=5")
+args+=("-XX:G1MixedGCCountTarget=4")
+args+=("-XX:G1MixedGCLiveThresholdPercent=90")
+args+=("-XX:G1RSetUpdatingPauseTimePercent=5")
+mkdir -p logs
+args+=("-Xlog:gc*:logs/gc.log:time,uptime:filecount=5,filesize=1M")
+args+=("-Dcom.mojang.eula.agree=true")
+
+args+=("-jar" "paper.jar" "--nogui")
+
+exec java ${args[@]}