kemalandClaude Opus 5.5
8c425182c3
Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01814GKVzZVL3FuF3DeiZXhv
51 lines
2.4 KiB
Bash
Executable File
51 lines
2.4 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Run a heavy command on the 8 GB Pi so that running out of memory kills only this command, never the desktop session.
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# MEM=4G MIN_FREE_MB=1200 bash scripts/pi_run.sh <command...>
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# 1. When the memory cgroup is available (cmdline.txt: cgroup_enable=memory cgroup_memory=1), the command runs in a
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# systemd user scope with MemoryMax=$MEM and no swap: the kernel kills it alone when it exceeds the cap.
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# 2. In every case a guard stops the command's process group when the system's MemAvailable drops below
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# MIN_FREE_MB (covers other processes filling memory, and systems without the memory cgroup).
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# Prints the peak memory of the command when it ends.
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set -uo pipefail
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MEM=${MEM:-4G}
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MIN_FREE_MB=${MIN_FREE_MB:-1200}
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uid=$(id -u)
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unit="simurg-job-$$-$(date +%s)"
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cg="/sys/fs/cgroup/user.slice/user-$uid.slice/user@$uid.service/app.slice/$unit.scope"
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if grep -qw memory "/sys/fs/cgroup/user.slice/user-$uid.slice/user@$uid.service/cgroup.controllers" 2>/dev/null; then
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setsid systemd-run --user --scope --unit="$unit" -p MemoryMax="$MEM" -p MemorySwapMax=0 --quiet -- "$@" &
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mode="cgroup MemoryMax=$MEM"
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else
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setsid "$@" &
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mode="no memory cgroup"
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fi
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pid=$!
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peak=0
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anon_peak=0 # process memory without page cache (memory.peak counts cached file pages, e.g. a FASTA being read)
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tripped=0
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while kill -0 "$pid" 2>/dev/null; do
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if [[ -r $cg/memory.peak ]]; then
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peak=$(( $(cat "$cg/memory.peak") / 1024 ))
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anon=$(awk '$1 == "anon" {print int($2 / 1024)}' "$cg/memory.stat" 2>/dev/null || echo 0)
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(( anon > anon_peak )) && anon_peak=$anon
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else
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rss=$(ps -o rss= -g "$pid" 2>/dev/null | awk '{s+=$1} END {print s+0}'); (( rss > peak )) && peak=$rss
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fi
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avail=$(awk '/^MemAvailable:/ {print int($2/1024)}' /proc/meminfo)
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if (( avail < MIN_FREE_MB )); then
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echo "pi_run: MemAvailable ${avail} MiB < ${MIN_FREE_MB} MiB -- stopping the job" >&2
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kill -TERM -- "-$pid" 2>/dev/null; sleep 5; kill -KILL -- "-$pid" 2>/dev/null
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tripped=1
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break
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fi
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sleep 1
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done
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wait "$pid"; rc=$?
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(( tripped )) && rc=137
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(( rc == 137 && ! tripped )) && [[ $mode == cgroup* ]] \
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&& echo "pi_run: the job was killed (SIGKILL); most likely it exceeded MemoryMax=$MEM" >&2
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anon_note=""
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(( anon_peak > 0 )) && anon_note=", process $((anon_peak / 1024)) MiB without page cache"
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echo "pi_run: exit $rc, peak memory $((peak / 1024)) MiB$anon_note ($mode, guard ${MIN_FREE_MB} MiB free)" >&2
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exit $rc
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