satr14/nix-flake
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cleanup flag config and update modpack
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Satria 2026-05-11 16:26:43 +07:00
commit 23d4592783
1 changed files with 13 additions and 19 deletions
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32
modules/system/homelab/mc.nix
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@ -2,9 +2,9 @@
ram-allocation-mb = 12288; ram-allocation-mb = 12288;
rcon-pass = "howdy"; rcon-pass = "howdy";
modpack = let modpack = let
commit = "918b281754d4c289a3567cca083774087b2a2ec0"; commit = "506050af820a4cf370c6f2021c5991d665ba902a";
in pkgs.fetchPackwizModpack { in pkgs.fetchPackwizModpack {
packHash = "sha256-HmTDQac9FCQXBPWiZIxu9zmHyl2vqMVQpZpDHp+2lBA="; packHash = "";
url = "https://git.satr14.my.id/satr14/server-modpack/raw/commit/${commit}/pack.toml"; url = "https://git.satr14.my.id/satr14/server-modpack/raw/commit/${commit}/pack.toml";
}; };
@ -38,23 +38,17 @@ in {
jvmOpts = let flags = [ jvmOpts = let flags = [
"-Xms${toString ram-allocation-mb}M" "-Xms${toString ram-allocation-mb}M"
"-Xmx${toString ram-allocation-mb}M" "-Xmx${toString ram-allocation-mb}M"
# Exposes SIMD instructions (requires full JDK, useful with performance mods) "-XX:+UseZGC" # Use ZGC (requires Java v25+, 8+ CPU cores, 10GB+ RAM)
"--add-modules=jdk.incubator.vector" "-XX:+UseCompactObjectHeaders" # Use compact object headers (requires Java v16+, saves a couple of bits per object)
# ZGC flags (requires Java v25+, 8+ CPU cores, 10GB+ RAM) "--add-modules=jdk.incubator.vector" # Exposes SIMD instructions (requires full JDK, useful with performance mods)
"-XX:+UseZGC" "-XX:+UseLargePages" # Large pages support (requires hugepages configured on the system)
"-XX:+UseLargePages" "-XX:+AlwaysPreTouch" # Pre-allocates memory on startup, OS claims it immediately for JVM instead of negotiating it
"-XX:+AlwaysPreTouch" "-XX:+DisableExplicitGC" # Disables mods from manually invoking the GC
"-XX:+DisableExplicitGC" "-XX:+PerfDisableSharedMem" # Disables constant /tmp writes for JVM metrics
"-XX:+PerfDisableSharedMem" "-XX:ZAllocationSpikeTolerance=5" # Helps when server is active with many players (causes unnecessary GC load at idle)
"-XX:+UseCompactObjectHeaders" "-XX:SoftMaxHeapSize=${toString (ram-allocation-mb - 2048)}M" # Leave 2GB headroom for off-heap memory (native code, mods, and ZGC overhead)
"-XX:ZAllocationSpikeTolerance=5"
"-XX:SoftMaxHeapSize=${toString (ram-allocation-mb - 2048)}M"
# High MSPT due to ZGC pauses
"-XX:ZUncommitDelay=300"
"-XX:ZCollectionInterval=5"
]; in lib.concatStringsSep " " flags; ]; in lib.concatStringsSep " " flags;
# extraStartPost = let gamerules = { # extraStartPost = let gamerules = {