Claude
e83c9949d8
Spring Boot 4.1.1 catalog service measured on JDK 25, 26 and 27: live heap 320 MB to 273 MB with compact headers, per-class bytes per instance, container-sizing sweeps with real cgroup limits, 1-CPU Serial vs G1 with Native Memory Tracking, removed flags (MaxRAM, UseCompressedClassPointers), and a kernel OOM-kill check. Outputs in jdk27-memory/output. Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01TF9JWFvJSNm6HVzswzZU5a
29 lines
1.8 KiB
Bash
29 lines
1.8 KiB
Bash
#!/usr/bin/env bash
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# What does "killed" mean in the container sweep? Runs the edge case (JDK 27, compact headers off, 400 MB
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# container, heap 75%) a few times and reads the cgroup's own counters and the kernel log afterwards, so the
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# claim "the kernel's memory controller killed it" rests on the kernel's say-so and not on an exit code.
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source "$(dirname "$0")/lib.sh"
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KILLED=()
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echo "# JDK 27, -XX:-UseCompactObjectHeaders -XX:MaxRAMPercentage=75, container limit 400 MB, 2 CPUs; 2,000,000 products"
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for attempt in 1 2 3 4; do
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cg="oomchk$attempt"
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cg_create "$cg" $((400*1024*1024)) 2
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port=$((30000 + RANDOM % 5000))
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bash -c "$CG_JOIN" _ "$cg" "$JDK27/bin/java" -XX:MaxRAMPercentage=75 -XX:-UseCompactObjectHeaders -jar "$JAR" --server.port=$port >/dev/null 2>&1 &
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pid=$!
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for _ in $(seq 1 120); do curl -sf localhost:$port/ping >/dev/null 2>&1 && break; sleep 0.25; done
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resp=$(curl -s --max-time 25 -o /dev/null -w '%{http_code}' "localhost:$port/load?n=2000000")
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sleep 1
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if kill -0 $pid 2>/dev/null; then state="process still alive"; else wait $pid 2>/dev/null; state="process gone, exit $?"; KILLED+=("$pid"); fi
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echo "== attempt $attempt: /load answered HTTP $resp; $state"
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echo " memory.failcnt=$(cat $CGROOT/memory/$cg/memory.failcnt) memory.max_usage=$(( $(cat $CGROOT/memory/$cg/memory.max_usage_in_bytes) / 1048576 ))MB limit=$(( $(cat $CGROOT/memory/$cg/memory.limit_in_bytes) / 1048576 ))MB $(grep '^oom_kill ' $CGROOT/memory/$cg/memory.oom_control)"
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kill $pid 2>/dev/null; wait $pid 2>/dev/null
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cg_remove "$cg"
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echo
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done
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echo "== the kernel log (dmesg): what it says about the processes that disappeared above"
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for p in "${KILLED[@]:-}"; do
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[ -n "$p" ] && dmesg 2>/dev/null | grep "Memory cgroup out of memory: Killed process $p " | sed 's/^\[[ 0-9.]*\] //'
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done
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exit 0
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