Add flags: production JVM flag cheat sheet for Spring Boot on JDK 25/27
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]>
This commit is contained in:
Claude Sonnet 5
@@ -0,0 +1,59 @@
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$ for mem,cpu in 256m:1 512m:1 1800m:1 512m:2 1800m:2 4g:2; do
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docker run --rm --memory=$mem --cpus=$cpu --entrypoint java flags-demo:jdk25 \
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-XX:+PrintFlagsFinal -version | grep -E "UseG1GC|UseSerialGC|UseCompactObjectHeaders|MaxHeapSize|MaxRAMPercentage"
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done
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--- mem=256m cpus=1 ---
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int ActiveProcessorCount = -1 {product} {default}
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size_t MaxHeapSize = 132120576 {product} {ergonomic}
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double MaxRAMPercentage = 25.000000 {product} {default}
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bool UseCompactObjectHeaders = false {product lp64_product} {default}
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bool UseG1GC = false {product} {default}
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bool UseParallelGC = false {product} {default}
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bool UseSerialGC = true {product} {ergonomic}
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--- mem=512m cpus=1 ---
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int ActiveProcessorCount = -1 {product} {default}
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size_t MaxHeapSize = 134217728 {product} {ergonomic}
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double MaxRAMPercentage = 25.000000 {product} {default}
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bool UseCompactObjectHeaders = false {product lp64_product} {default}
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bool UseG1GC = false {product} {default}
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bool UseParallelGC = false {product} {default}
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bool UseSerialGC = true {product} {ergonomic}
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--- mem=1800m cpus=1 ---
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int ActiveProcessorCount = -1 {product} {default}
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size_t MaxHeapSize = 471859200 {product} {ergonomic}
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double MaxRAMPercentage = 25.000000 {product} {default}
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bool UseCompactObjectHeaders = false {product lp64_product} {default}
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bool UseG1GC = false {product} {default}
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bool UseParallelGC = false {product} {default}
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bool UseSerialGC = true {product} {ergonomic}
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--- mem=512m cpus=2 ---
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int ActiveProcessorCount = -1 {product} {default}
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size_t MaxHeapSize = 134217728 {product} {ergonomic}
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double MaxRAMPercentage = 25.000000 {product} {default}
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bool UseCompactObjectHeaders = false {product lp64_product} {default}
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bool UseG1GC = false {product} {default}
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bool UseParallelGC = false {product} {default}
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bool UseSerialGC = true {product} {ergonomic}
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--- mem=1800m cpus=2 ---
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int ActiveProcessorCount = -1 {product} {default}
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size_t MaxHeapSize = 471859200 {product} {ergonomic}
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double MaxRAMPercentage = 25.000000 {product} {default}
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bool UseCompactObjectHeaders = false {product lp64_product} {default}
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bool UseG1GC = true {product} {ergonomic}
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bool UseParallelGC = false {product} {default}
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bool UseSerialGC = false {product} {default}
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--- mem=4g cpus=2 ---
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int ActiveProcessorCount = -1 {product} {default}
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size_t MaxHeapSize = 1073741824 {product} {ergonomic}
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double MaxRAMPercentage = 25.000000 {product} {default}
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bool UseCompactObjectHeaders = false {product lp64_product} {default}
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bool UseG1GC = true {product} {ergonomic}
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bool UseParallelGC = false {product} {default}
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bool UseSerialGC = false {product} {default}
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@@ -0,0 +1,59 @@
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$ for mem,cpu in 256m:1 512m:1 1800m:1 512m:2 1800m:2 4g:2; do
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docker run --rm --memory=$mem --cpus=$cpu --entrypoint java flags-demo:jdk27 \
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-XX:+PrintFlagsFinal -version | grep -E "UseG1GC|UseSerialGC|UseCompactObjectHeaders|MaxHeapSize|MaxRAMPercentage"
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done
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--- mem=256m cpus=1 ---
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int ActiveProcessorCount = -1 {product} {default}
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size_t MaxHeapSize = 132120576 {product} {ergonomic}
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double MaxRAMPercentage = 25.000000 {product} {default}
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bool UseCompactObjectHeaders = true {product lp64_product} {default}
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bool UseG1GC = true {product} {ergonomic}
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bool UseParallelGC = false {product} {default}
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bool UseSerialGC = false {product} {default}
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--- mem=512m cpus=1 ---
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int ActiveProcessorCount = -1 {product} {default}
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size_t MaxHeapSize = 134217728 {product} {ergonomic}
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double MaxRAMPercentage = 25.000000 {product} {default}
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bool UseCompactObjectHeaders = true {product lp64_product} {default}
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bool UseG1GC = true {product} {ergonomic}
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bool UseParallelGC = false {product} {default}
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bool UseSerialGC = false {product} {default}
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--- mem=1800m cpus=1 ---
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int ActiveProcessorCount = -1 {product} {default}
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size_t MaxHeapSize = 471859200 {product} {ergonomic}
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double MaxRAMPercentage = 25.000000 {product} {default}
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bool UseCompactObjectHeaders = true {product lp64_product} {default}
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bool UseG1GC = true {product} {ergonomic}
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bool UseParallelGC = false {product} {default}
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bool UseSerialGC = false {product} {default}
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--- mem=512m cpus=2 ---
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int ActiveProcessorCount = -1 {product} {default}
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size_t MaxHeapSize = 134217728 {product} {ergonomic}
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double MaxRAMPercentage = 25.000000 {product} {default}
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bool UseCompactObjectHeaders = true {product lp64_product} {default}
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bool UseG1GC = true {product} {ergonomic}
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bool UseParallelGC = false {product} {default}
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bool UseSerialGC = false {product} {default}
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--- mem=1800m cpus=2 ---
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int ActiveProcessorCount = -1 {product} {default}
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size_t MaxHeapSize = 471859200 {product} {ergonomic}
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double MaxRAMPercentage = 25.000000 {product} {default}
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bool UseCompactObjectHeaders = true {product lp64_product} {default}
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bool UseG1GC = true {product} {ergonomic}
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bool UseParallelGC = false {product} {default}
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bool UseSerialGC = false {product} {default}
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--- mem=4g cpus=2 ---
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int ActiveProcessorCount = -1 {product} {default}
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size_t MaxHeapSize = 1073741824 {product} {ergonomic}
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double MaxRAMPercentage = 25.000000 {product} {default}
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bool UseCompactObjectHeaders = true {product lp64_product} {default}
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bool UseG1GC = true {product} {ergonomic}
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bool UseParallelGC = false {product} {default}
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bool UseSerialGC = false {product} {default}
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@@ -0,0 +1,13 @@
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$ docker run --rm --cpus=1 --memory=1g --entrypoint java flags-demo:jdk27 -XX:+PrintFlagsFinal -version | grep -E "ParallelGCThreads|ConcGCThreads|ActiveProcessorCount"
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$ docker run --rm --cpus=1 --memory=1g --entrypoint java flags-demo:jdk27 -XX:ActiveProcessorCount=8 -XX:+PrintFlagsFinal -version | grep -E "ParallelGCThreads|ConcGCThreads|ActiveProcessorCount"
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=== ActiveProcessorCount lying to the JVM: 1 real CPU, told there are 8 ===
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--- JDK27, --cpus=1, no override (correct) ---
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int ActiveProcessorCount = -1 {product} {default}
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uint ConcGCThreads = 1 {product} {ergonomic}
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uint ParallelGCThreads = 1 {product} {default}
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--- JDK27, --cpus=1, -XX:ActiveProcessorCount=8 (lying) ---
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int ActiveProcessorCount = 8 {product} {command line}
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uint ConcGCThreads = 2 {product} {ergonomic}
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uint ParallelGCThreads = 8 {product} {default}
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@@ -0,0 +1,27 @@
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$ docker run -d --memory=1g --name hdr -v $PWD/docker/headersize.jar:/headersize.jar \
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--entrypoint java flags-demo:<tag> [extra flags] -cp /headersize.jar HeaderSizeDemo 2000000
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$ docker exec hdr jcmd 1 GC.class_histogram | grep -E "Pair|Total"
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--- JDK 25, default (UseCompactObjectHeaders=false), flags-demo:jdk25-jdk ---
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1: 2000000 48000000 HeaderSizeDemo$Pair
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273: 1 24 java.lang.invoke.StringConcatFactory$InlineHiddenClassStrategy$MethodHandlePair ([email protected])
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Total 2030279 57368512
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--- JDK 25, -XX:+UseCompactObjectHeaders ---
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1: 2000000 32000000 HeaderSizeDemo$Pair
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300: 1 16 java.lang.invoke.StringConcatFactory$InlineHiddenClassStrategy$MethodHandlePair ([email protected])
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Total 2030283 41272056
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--- JDK 27, default (UseCompactObjectHeaders=true), flags-demo:jdk27 ---
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1: 2000000 32000000 HeaderSizeDemo$Pair
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317: 1 16 java.lang.invoke.StringConcatFactory$InlineHiddenClassStrategy$MethodHandlePair (java.base@27)
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Total 2030937 41320144
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--- JDK 27, -XX:-UseCompactObjectHeaders ---
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1: 2000000 48000000 HeaderSizeDemo$Pair
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282: 1 24 java.lang.invoke.StringConcatFactory$InlineHiddenClassStrategy$MethodHandlePair (java.base@27)
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Total 2031092 57425040
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2,000,000 instances of a 2-int object: 48,000,000 bytes (24 bytes each) with the old header,
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32,000,000 bytes (16 bytes each) compact. 33% smaller per instance, reproduced symmetrically
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in both directions on both JDKs.
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@@ -0,0 +1,23 @@
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$ docker run --rm --memory=256m --entrypoint java flags-demo:jdk25 \
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-Xlog:gc -XX:MaxRAMPercentage=75 -cp /memoryhog.jar MemoryHog 24 200
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[0.004s][info][gc] Using Serial
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MemoryHog starting: chunk=24MB sleep=200ms
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[0.048s][info][gc] GC(0) Pause Young (Allocation Failure) 1M->1M(7M) 0.713ms
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held=24MB heapUsed=25MB heapMax=185MB freeHeap=6MB
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[0.291s][info][gc] GC(1) Pause Young (Allocation Failure) 25M->25M(31M) 1.105ms
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held=48MB heapUsed=49MB heapMax=185MB freeHeap=6MB
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[0.507s][info][gc] GC(2) Pause Young (Allocation Failure) 49M->49M(77M) 0.643ms
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held=72MB heapUsed=73MB heapMax=185MB freeHeap=27MB
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[0.723s][info][gc] GC(3) Pause Young (Allocation Failure) 73M->73M(112M) 0.176ms
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held=96MB heapUsed=98MB heapMax=185MB freeHeap=14MB
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[0.962s][info][gc] GC(4) Pause Young (Allocation Failure) 98M->97M(147M) 23.535ms
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held=120MB heapUsed=122MB heapMax=185MB freeHeap=24MB
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[1.201s][info][gc] GC(5) Pause Young (Allocation Failure) 122M->121M(181M) 28.449ms
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held=144MB heapUsed=146MB heapMax=185MB freeHeap=35MB
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held=168MB heapUsed=170MB heapMax=185MB freeHeap=11MB
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[1.633s][info][gc] GC(6) Pause Full (Allocation Failure) 170M->169M(185M) 5.895ms
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[1.649s][info][gc] GC(7) Pause Full (Allocation Failure) 169M->169M(185M) 15.822ms
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Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
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at MemoryHog.main(MemoryHog.java:21)
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exit=1
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@@ -0,0 +1,26 @@
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$ 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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@@ -0,0 +1,31 @@
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$ docker run --rm --memory=256m --entrypoint java flags-demo:jdk25 \
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-XX:-UseContainerSupport -XX:+PrintFlagsFinal -version | grep -E "MaxHeapSize|UseContainerSupport"
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$ docker run --rm --memory=256m --entrypoint java flags-demo:jdk25 \
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-Xlog:gc -XX:-UseContainerSupport -cp /memoryhog.jar MemoryHog 24 200
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--- what the flag alone resolves heap to ---
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size_t MaxHeapSize = 2105540608 {product} {ergonomic}
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size_t SoftMaxHeapSize = 2105540608 {manageable} {ergonomic}
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bool UseContainerSupport = false {product} {command line}
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--- the hog run ---
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[0.004s][info][gc] Using G1
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MemoryHog starting: chunk=24MB sleep=200ms
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held=24MB heapUsed=26MB heapMax=2008MB freeHeap=101MB
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held=48MB heapUsed=52MB heapMax=2008MB freeHeap=75MB
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[0.515s][info][gc] GC(0) Pause Young (Concurrent Start) (G1 Humongous Allocation) 52M->51M(128M) 1.445ms
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[0.515s][info][gc] GC(1) Concurrent Undo Cycle
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[0.515s][info][gc] GC(1) Concurrent Undo Cycle 0.084ms
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held=72MB heapUsed=76MB heapMax=2008MB freeHeap=51MB
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[0.731s][info][gc] GC(2) Pause Young (Concurrent Start) (G1 Humongous Allocation) 76M->76M(128M) 1.569ms
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[0.732s][info][gc] GC(3) Concurrent Mark Cycle
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[0.748s][info][gc] GC(3) Pause Remark 101M->101M(172M) 0.580ms
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[0.749s][info][gc] GC(3) Pause Cleanup 101M->101M(172M) 0.018ms
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held=96MB heapUsed=101MB heapMax=2008MB freeHeap=70MB
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[0.751s][info][gc] GC(3) Concurrent Mark Cycle 19.274ms
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held=120MB heapUsed=126MB heapMax=2008MB freeHeap=45MB
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held=144MB heapUsed=151MB heapMax=2008MB freeHeap=45MB
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held=168MB heapUsed=176MB heapMax=2008MB freeHeap=45MB
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held=192MB heapUsed=201MB heapMax=2008MB freeHeap=45MB
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held=216MB heapUsed=226MB heapMax=2008MB freeHeap=45MB
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container exit code: 137
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@@ -0,0 +1,23 @@
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$ docker run --rm --memory=256m -v $PWD/docker/memoryhog.jar:/memoryhog.jar --entrypoint java flags-demo:jdk25-jdk \
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-XX:MaxRAMPercentage=75 -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/dumps/heap.hprof \
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-cp /memoryhog.jar MemoryHog 24 200
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=== Diagnostic: -XX:+HeapDumpOnOutOfMemoryError actually leaves a dump behind ===
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MemoryHog starting: chunk=24MB sleep=200ms
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held=24MB heapUsed=25MB heapMax=185MB freeHeap=6MB
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held=48MB heapUsed=49MB heapMax=185MB freeHeap=6MB
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held=72MB heapUsed=73MB heapMax=185MB freeHeap=27MB
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held=96MB heapUsed=98MB heapMax=185MB freeHeap=14MB
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held=120MB heapUsed=122MB heapMax=185MB freeHeap=24MB
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held=144MB heapUsed=146MB heapMax=185MB freeHeap=35MB
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held=168MB heapUsed=170MB heapMax=185MB freeHeap=11MB
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java.lang.OutOfMemoryError: Java heap space
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Dumping heap to /dumps/heap.hprof ...
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Heap dump file created [180390818 bytes in 1.028 secs]
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Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
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at MemoryHog.main(MemoryHog.java:21)
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exit=1
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total 176176
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drwxr-xr-x 2 root root 4096 Oct 1 04:29 .
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drwxr-xr-x 3 root root 4096 Oct 1 04:29 ..
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-rw------- 1 root root 180390818 Oct 1 04:29 heap.hprof
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@@ -0,0 +1,97 @@
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$ docker run -d --memory=512m --name nmtdemo -v $PWD/docker/flags-demo.jar:/app.jar --entrypoint java flags-demo:jdk25-jdk \
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-XX:NativeMemoryTracking=summary -XX:MaxRAMPercentage=75 -jar /app.jar
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$ docker exec nmtdemo jcmd 1 VM.native_memory summary
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=== Diagnostic: -XX:NativeMemoryTracking=summary via jcmd ===
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1:
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Native Memory Tracking:
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(Omitting categories weighting less than 1KB)
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Total: reserved=1824154KB, committed=115878KB
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malloc: 34018KB #144561, peak=35841KB #140626
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mmap: reserved=1790136KB, committed=81860KB
|
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- Java Heap (reserved=393216KB, committed=23532KB)
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(mmap: reserved=393216KB, committed=23532KB, at peak)
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- Class (reserved=1049299KB, committed=5075KB)
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(classes #8049)
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( instance classes #7466, array classes #583)
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(malloc=723KB tag=Class #15577) (at peak)
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(mmap: reserved=1048576KB, committed=4352KB, at peak)
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( Metadata: )
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( reserved=65536KB, committed=27072KB)
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( used=26779KB)
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( waste=293KB =1.08%)
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( Class space:)
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( reserved=1048576KB, committed=4352KB)
|
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( used=4187KB)
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( waste=165KB =3.79%)
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- Thread (reserved=17468KB, committed=1380KB)
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(threads #17)
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(stack: reserved=17408KB, committed=1320KB, peak=1320KB)
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(malloc=42KB tag=Thread #105) (peak=51KB #108)
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(arena=18KB #30) (peak=301KB #22)
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|
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- Code (reserved=252158KB, committed=16014KB)
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(malloc=4465KB tag=Code #21734) (at peak)
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(mmap: reserved=247692KB, committed=11548KB, at peak)
|
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(arena=1KB #1) (peak=34KB #2)
|
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- GC (reserved=1302KB, committed=102KB)
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(malloc=22KB tag=GC #58) (peak=96KB #79)
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(mmap: reserved=1280KB, committed=80KB, at peak)
|
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|
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- Compiler (reserved=8163KB, committed=8163KB)
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(malloc=54KB tag=Compiler #86) (peak=69KB #91)
|
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(arena=8110KB #14) (peak=22951KB #14)
|
||||
|
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- Internal (reserved=1324KB, committed=1324KB)
|
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(malloc=1288KB tag=Internal #5521) (at peak)
|
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(mmap: reserved=36KB, committed=36KB, at peak)
|
||||
|
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- Other (reserved=20KB, committed=20KB)
|
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(malloc=20KB tag=Other #3) (at peak)
|
||||
|
||||
- Symbol (reserved=6745KB, committed=6745KB)
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(malloc=6034KB tag=Symbol #93254) (at peak)
|
||||
(arena=712KB #1) (at peak)
|
||||
|
||||
- Native Memory Tracking (reserved=2576KB, committed=2576KB)
|
||||
(malloc=35KB tag=Native Memory Tracking #619) (at peak)
|
||||
(tracking overhead=2541KB)
|
||||
|
||||
- Shared class space (reserved=16384KB, committed=13912KB, readonly=0KB)
|
||||
(mmap: reserved=16384KB, committed=13912KB, peak=14120KB)
|
||||
|
||||
- Arena Chunk (reserved=9219KB, committed=9219KB)
|
||||
(malloc=9219KB tag=Arena Chunk #541) (peak=23793KB #558)
|
||||
|
||||
- Tracing (reserved=5KB, committed=5KB)
|
||||
(malloc=5KB tag=Tracing #22) (at peak)
|
||||
|
||||
- Module (reserved=80KB, committed=80KB)
|
||||
(malloc=80KB tag=Module #2158) (at peak)
|
||||
|
||||
- Safepoint (reserved=8KB, committed=8KB)
|
||||
(mmap: reserved=8KB, committed=8KB, at peak)
|
||||
|
||||
- Synchronization (reserved=483KB, committed=483KB)
|
||||
(malloc=483KB tag=Synchronization #4738) (at peak)
|
||||
|
||||
- Serviceability (reserved=17KB, committed=17KB)
|
||||
(malloc=17KB tag=Serviceability #14) (peak=20KB #18)
|
||||
|
||||
- Metaspace (reserved=65672KB, committed=27208KB)
|
||||
(malloc=136KB tag=Metaspace #46) (at peak)
|
||||
(mmap: reserved=65536KB, committed=27072KB, at peak)
|
||||
|
||||
- String Deduplication (reserved=1KB, committed=1KB)
|
||||
(malloc=1KB tag=String Deduplication #8) (at peak)
|
||||
|
||||
- Object Monitors (reserved=13KB, committed=13KB)
|
||||
(malloc=13KB tag=Object Monitors #69) (at peak)
|
||||
|
||||
Reference in New Issue
Block a user