asmhatreandClaude Sonnet 5
2f88734f5d
MaxRAMPercentage vs a hardcoded -Xmx, -XX:-UseContainerSupport, the ActiveProcessorCount lie, and which diagnostic flags are worth leaving on in prod, verified in real Docker containers on JDK 25 and JDK 27. Co-Authored-By: Claude Sonnet 5 <[email protected]>
27 lines
1.4 KiB
Plaintext
27 lines
1.4 KiB
Plaintext
$ docker run --rm --memory=256m --entrypoint java flags-demo:jdk25 \
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-Xlog:gc -Xmx1g -cp /memoryhog.jar MemoryHog 24 200
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$ echo "exit code: $?"
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$ docker inspect <id> --format "OOMKilled={{.State.OOMKilled}} ExitCode={{.State.ExitCode}}"
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[0.005s][info][gc] Using Serial
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MemoryHog starting: chunk=24MB sleep=200ms
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[0.054s][info][gc] GC(0) Pause Young (Allocation Failure) 1M->1M(7M) 0.685ms
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held=24MB heapUsed=25MB heapMax=989MB freeHeap=6MB
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[0.296s][info][gc] GC(1) Pause Young (Allocation Failure) 25M->25M(31M) 1.057ms
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held=48MB heapUsed=49MB heapMax=989MB freeHeap=6MB
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[0.513s][info][gc] GC(2) Pause Young (Allocation Failure) 49M->49M(77M) 0.606ms
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held=72MB heapUsed=73MB heapMax=989MB freeHeap=27MB
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[0.728s][info][gc] GC(3) Pause Young (Allocation Failure) 73M->73M(112M) 0.184ms
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held=96MB heapUsed=98MB heapMax=989MB freeHeap=14MB
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[0.959s][info][gc] GC(4) Pause Young (Allocation Failure) 98M->97M(147M) 15.593ms
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held=120MB heapUsed=122MB heapMax=989MB freeHeap=24MB
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[1.180s][info][gc] GC(5) Pause Young (Allocation Failure) 122M->121M(181M) 15.364ms
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held=144MB heapUsed=146MB heapMax=989MB freeHeap=35MB
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held=168MB heapUsed=170MB heapMax=989MB freeHeap=11MB
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[1.634s][info][gc] GC(6) Pause Young (Allocation Failure) 170M->169M(251M) 34.003ms
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held=192MB heapUsed=194MB heapMax=989MB freeHeap=56MB
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held=216MB heapUsed=218MB heapMax=989MB freeHeap=32MB
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container exit code: 137
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error: no such object: hogB
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