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Lower default heap to 10G 

13G left roughly 1G for the OS once the ZFS ARC cap is accounted for. 10G plus
a 2G ARC leaves comfortable headroom on a 16G host.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
main
Amir Alexander Abdelbaki 2026-08-05 22:38:50 +02:00
parent c9da65d7ce
commit 87b280cc91
3 changed files with 10 additions and 10 deletions
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14
README.md
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@ -41,20 +41,20 @@ server address already filled in.
## Memory
The heap defaults to 13 GB (`-X`/`-x` to change it). `-XX:+AlwaysPreTouch` means
the JVM commits the whole heap at startup rather than growing into it.
The heap defaults to 10 GB (`-X`/`-x` to change it). `-XX:+AlwaysPreTouch` means
the JVM commits the whole heap at startup rather than growing into it, so the
number you set is the number actually taken.
On a ZFS host, cap the ARC before running a heap this large — ZFS defaults to
using up to half of RAM for cache, which will fight the JVM for the same pages:
On a ZFS host, cap the ARC to go with it — ZFS defaults to using up to half of
RAM for cache, and will otherwise contend with the JVM for the same pages:
```bash
echo "options zfs zfs_arc_max=2147483648" | sudo tee /etc/modprobe.d/zfs.conf
sudo dracut --force && sudo reboot
```
That pins the ARC to 2 GB. On a 16 GB box, 13 GB heap + 2 GB ARC leaves ~1 GB
for everything else, which is tight — drop the heap to 10–11 GB if the host
does anything besides run the server.
That pins the ARC to 2 GB. On a 16 GB box that leaves roughly 4 GB for the OS
and anything else the host runs, which is comfortable.
## Requirements

2
deploy.sh
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@ -14,7 +14,7 @@
set -euo pipefail
NAME=""; AUTHOR=""; BASEURL=""; NFVER="latest"; MCVER="1.21.1"
SHARE="/minecraft"; XMX="13G"; XMS="13G"; ACCEPT_EULA=""
SHARE="/minecraft"; XMX="10G"; XMS="10G"; ACCEPT_EULA=""
HERE="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
die() { echo "error: $*" >&2; exit 1; }

4
mc-service-setup.sh
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@ -18,8 +18,8 @@ set -euo pipefail
SHARE="/minecraft"
MCUSER="minecraft"
XMS="13G"
XMX="13G"
XMS="10G"
XMX="10G"
NFVER="" # version, or "latest" to resolve one; empty = don't install
MCVER="1.21.1" # only used to pick the matching NeoForge series
ADMIN="" # human user who authors the pack on the share