feat: ⚡ Improved Java parameter calculation

entrypoint.sh

@@ -1,11 +1,34 @@
 #!/bin/sh
 
+set -ex
+
+# Caluclate Memory Limit from cgroups/maxmemory
 MEMSIZE=$(grep MemTotal /proc/meminfo | awk '{print $2 * 1024}')
 MEMLIMIT=$(cat /sys/fs/cgroup/memory/memory.limit_in_bytes)
 MEMLIMIT=$((MEMLIMIT<MEMSIZE ? MEMLIMIT : MEMSIZE))
-MEMOFFSET=1073741824
+
+MEMOFFSET_THRESH=4294967296
+G1PARAM_THRESH=12884901888
+
+# Offset memory for Java by 1-1.5G depending on memory available
+if [ $MEMLIMIT -lt $MEMOFFSET_THRESH ]; then
+    MEMOFFSET=1073741824
+else
+    MEMOFFSET=1610612736
+fi
 SERVER_MEM=$((MEMLIMIT-MEMOFFSET))
 
+# Configure G1 parameters based on Java memory limits
+if [ $SERVER_MEM -lt $G1PARAM_THRESH ]; then
+    G1NEWSIZE=30
+    G1MAXNEWSIZE=40
+    G1HEAP=8M
+else
+    G1NEWSIZE=40
+    G1MAXNEWSIZE=50
+    G1HEAP=16M
+fi
+
 if [ -e "/server/modpack.json" ]; then
     mrpack-install --server-dir /server --server-file server.jar update "$@" <<EOF
 y
@@ -20,8 +43,8 @@ cat eula.txt
 java -Xms$SERVER_MEM -Xmx$SERVER_MEM -XX:+UseG1GC \
      -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 \
      -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC \
-     -XX:+AlwaysPreTouch -XX:G1NewSizePercent=30 \
+     -XX:+AlwaysPreTouch -XX:G1NewSizePercent=$G1NEWSIZE \
-     -XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=8M \
+     -XX:G1MaxNewSizePercent=$G1MAXNEWSIZE -XX:G1HeapRegionSize=$G1HEAP \
      -XX:G1ReservePercent=20 -XX:G1HeapWastePercent=5 \
      -XX:G1MixedGCCountTarget=4 -XX:InitiatingHeapOccupancyPercent=15 \
      -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=5 \