我有一个运行Spring Boot微服务的容器。我 在OpenJDK运行时环境（IcedTea 3.12.0）（Alpine 8.212.04-r0）下 使用 openjdk版本“ 1.8.0_212”（ 当使用 -XX：+ PrintFlagsFinal 标志并打印我 期望 看到的JVM参数时）
-XX：+ UseParallelGC为true
但令我惊讶的是，这四个收集器（-XX：+ UseSerialGC，-XX：+ UseParallelGC，-XX：+ UseConcMarkSweepGC，–XX：+ UseG1GC）都没有激活。
下面显示的是我的dockerfile：
FROM openjdk:8-jdk-alpine ADD ./demo-0.0.1-SNAPSHOT.jar /usr/src/factorial/ WORKDIR /usr/src/factorial EXPOSE 8080 CMD java $JAVA_OPTIONS -jar demo-0.0.1-SNAPSHOT.jar
我正在使用此运行：
docker run -d --rm --name factorialorialContainer --memory='512m' --cpus=2 -p 8080:8080 -e JAVA_OPTIONS="$(cat /Users/sulekahelmini/Documents/fyp/fyp_work/MLscripts/$3)" suleka96/factorial:latest
flags_base.txt
-Xms512m -Xmx512m -XX:+PrintFlagsFinal -version
这是-XX：+ PrintFlagsFinal输出的一部分
intx UnguardOnExecutionViolation = 0 {product} bool UnlinkSymbolsALot = false {product} bool Use486InstrsOnly = false {ARCH product} bool UseAES = true {product} bool UseAESIntrinsics = true {product} intx UseAVX = 2 {ARCH product} bool UseAdaptiveGCBoundary = false {product} bool UseAdaptiveGenerationSizePolicyAtMajorCollection = true {product} bool UseAdaptiveGenerationSizePolicyAtMinorCollection = true {product} bool UseAdaptiveNUMAChunkSizing = true {product} bool UseAdaptiveSizeDecayMajorGCCost = true {product} bool UseAdaptiveSizePolicy = true {product} bool UseAdaptiveSizePolicyFootprintGoal = true {product} bool UseAdaptiveSizePolicyWithSystemGC = false {product} bool UseAddressNop = true {ARCH product} bool UseAltSigs = false {product} bool UseAutoGCSelectPolicy = false {product} bool UseBMI1Instructions = true {ARCH product} bool UseBMI2Instructions = true {ARCH product} bool UseBiasedLocking = true {product} bool UseBimorphicInlining = true {C2 product} bool UseBoundThreads = true {product} bool UseCLMUL = true {ARCH product} bool UseCMSBestFit = true {product} bool UseCMSCollectionPassing = true {product} bool UseCMSCompactAtFullCollection = true {product} bool UseCMSInitiatingOccupancyOnly = false {product} bool UseCRC32Intrinsics = true {product} bool UseCodeCacheFlushing = true {product} bool UseCompiler = true {product} bool UseCompilerSafepoints = true {product} bool UseCompressedClassPointers := true {lp64_product} bool UseCompressedOops := true {lp64_product} bool UseConcMarkSweepGC = false {product} bool UseCondCardMark = false {C2 product} bool UseContainerSupport = true {product} bool UseCountLeadingZerosInstruction = true {ARCH product} bool UseCountTrailingZerosInstruction = true {ARCH product} bool UseCountedLoopSafepoints = false {C2 product} bool UseCounterDecay = true {product} bool UseDivMod = true {C2 product} bool UseDynamicNumberOfGCThreads = false {product} bool UseFPUForSpilling = true {C2 product} bool UseFastAccessorMethods = false {product} bool UseFastEmptyMethods = false {product} bool UseFastJNIAccessors = true {product} bool UseFastStosb = true {ARCH product} bool UseG1GC = false {product} bool UseGCLogFileRotation = false {product} bool UseGCOverheadLimit = true {product} bool UseGCTaskAffinity = false {product} bool UseHeavyMonitors = false {product} bool UseHugeTLBFS = false {product} bool UseInlineCaches = true {product} bool UseInterpreter = true {product} bool UseJumpTables = true {C2 product} bool UseLWPSynchronization = true {product} bool UseLargePages = false {pd product} bool UseLargePagesInMetaspace = false {product} bool UseLargePagesIndividualAllocation = false {pd product} bool UseLinuxPosixThreadCPUClocks = true {product} bool UseLockedTracing = false {product} bool UseLoopCounter = true {product} bool UseLoopInvariantCodeMotion = true {C1 product} bool UseLoopPredicate = true {C2 product} bool UseMathExactIntrinsics = true {C2 product} bool UseMaximumCompactionOnSystemGC = true {product} bool UseMembar = false {pd product} bool UseMontgomeryMultiplyIntrinsic = true {C2 product} bool UseMontgomerySquareIntrinsic = true {C2 product} bool UseMulAddIntrinsic = true {C2 product} bool UseMultiplyToLenIntrinsic = true {C2 product} bool UseNUMA = false {product} bool UseNUMAInterleaving = false {product} bool UseNewLongLShift = false {ARCH product} bool UseOSErrorReporting = false {pd product} bool UseOldInlining = true {C2 product} bool UseOnStackReplacement = true {pd product} bool UseOnlyInlinedBimorphic = true {C2 product} bool UseOprofile = false {product} bool UseOptoBiasInlining = true {C2 product} bool UsePSAdaptiveSurvivorSizePolicy = true {product} bool UseParNewGC = false {product} bool UseParallelGC = false {product} bool UseParallelOldGC = false {product} bool UsePerfData = true {product} bool UsePopCountInstruction = true {product} bool UseRDPCForConstantTableBase = false {C2 product} bool UseRTMDeopt = false {ARCH product} bool UseRTMLocking = false {ARCH product} bool UseSHA = false {product} bool UseSHA1Intrinsics = false {product} bool UseSHA256Intrinsics = false {product} bool UseSHA512Intrinsics = false {product} bool UseSHM = false {product} intx UseSSE = 4 {product} bool UseSSE42Intrinsics = true {product} bool UseSerialGC = false {product} bool UseSharedSpaces = false {product} bool UseSignalChaining = true {product} bool UseSquareToLenIntrinsic = true {C2 product} bool UseStoreImmI16 = false {ARCH product} bool UseStringDeduplication = false {product} bool UseSuperWord = true {C2 product} bool UseTLAB = true {pd product} bool UseThreadPriorities = true {pd product} bool UseTransparentHugePages = false {product} bool UseTypeProfile = true {product} bool UseTypeSpeculation = true {C2 product} bool UseUnalignedLoadStores = false {ARCH product} bool UseVMInterruptibleIO = false {product} bool UseXMMForArrayCopy = true {product} bool UseXmmI2D = false {ARCH product} bool UseXmmI2F = false {ARCH product} bool UseXmmLoadAndClearUpper = true {ARCH product} bool UseXmmRegToRegMoveAll = true
跑步后
jcmd [pid] VM.flags
我得到以下输出，该输出也未指定收集器：
-XX:CICompilerCount=2 -XX:InitialHeapSize=536870912 -XX:MaxHeapSize=536870912 -XX:MaxNewSize=178913280 -XX:MinHeapDeltaBytes=196608 -XX:NewSize=178913280 -XX:OldSize=357957632 -XX:+StartAttachListener -XX:+UseCompressedClassPointers -XX:+UseCompressedOops
这是怎么回事？我做错了什么吗？
在JDK 8中，如果未Use*GC设置标志，并且未按人体工程学选择并行GC，则使用串行GC。
Use*GC
自JDK 9起，在这种情况下，JDK-8068582的修复程序会自动打开-XX:+UseSerialGC。
-XX:+UseSerialGC
