如何在Java程序中设置JVM参数值 [英] How to set JVM parameter values in a java program

问题描述

我有一堆JVM参数值:

I have a long list of JVM parameter values:

-XX:+UseSerialGC -XX:+ResizePLAB -XX:-ResizeOldPLAB -XX:-AlwaysPreTouch -XX:-ParallelRefProcEnabled -XX:+ParallelRefProcBalancingEnabled -XX:+UseTLAB -XX:-ResizeTLAB -XX:-ZeroTLAB -XX:-FastTLABRefill -XX:+NeverActAsServerClassMachine -XX:-AlwaysActAsServerClassMachine -XX:+UseAutoGCSelectPolicy -XX:+UseAdaptiveSizePolicy -XX:+UsePSAdaptiveSurvivorSizePolicy -XX:-UseAdaptiveGenerationSizePolicyAtMinorCollection -XX:+UseAdaptiveGenerationSizePolicyAtMajorCollection -XX:+UseAdaptiveSizePolicyWithSystemGC -XX:+UseAdaptiveGCBoundary -XX:+UseAdaptiveSizePolicyFootprintGoal -XX:-UseAdaptiveSizeDecayMajorGCCost -XX:+UseGCOverheadLimit -XX:+DisableExplicitGC -XX:-CollectGen0First -XX:+BindGCTaskThreadsToCPUs -XX:+UseGCTaskAffinity -XX:YoungPLABSize=3397 -XX:OldPLABSize=1123 -XX:GCTaskTimeStampEntries=240 -XX:TargetPLABWastePct=6 -XX:PLABWeight=75 -XX:OldPLABWeight=46 -XX:MarkStackSize=4617021 -XX:MarkStackSizeMax=713160576 -XX:RefDiscoveryPolicy=0 -XX:InitiatingHeapOccupancyPercent=48 -XX:MaxRAM=139765086242 -XX:ErgoHeapSizeLimit=0 -XX:MaxRAMFraction=4 -XX:DefaultMaxRAMFraction=4 -XX:MinRAMFraction=2 -XX:InitialRAMFraction=61 -XX:AutoGCSelectPauseMillis=5557 -XX:AdaptiveSizeThroughPutPolicy=0 -XX:AdaptiveSizePausePolicy=0 -XX:AdaptiveSizePolicyInitializingSteps=28 -XX:AdaptiveSizePolicyOutputInterval=0 -XX:AdaptiveSizePolicyWeight=12 -XX:AdaptiveTimeWeight=19 -XX:PausePadding=0 -XX:PromotedPadding=3 -XX:SurvivorPadding=3 -XX:ThresholdTolerance=10 -XX:AdaptiveSizePolicyCollectionCostMargin=49 -XX:YoungGenerationSizeIncrement=16 -XX:YoungGenerationSizeSupplement=104 -XX:YoungGenerationSizeSupplementDecay=9 -XX:TenuredGenerationSizeIncrement=22 -XX:TenuredGenerationSizeSupplement=117 -XX:TenuredGenerationSizeSupplementDecay=2 -XX:MaxGCPauseMillis=13557897735059052544 -XX:GCPauseIntervalMillis=0 -XX:MaxGCMinorPauseMillis=16119267456708329472 -XX:GCTimeRatio=73 -XX:AdaptiveSizeDecrementScaleFactor=4 -XX:AdaptiveSizeMajorGCDecayTimeScale=11 -XX:MinSurvivorRatio=1 -XX:InitialSurvivorRatio=6 -XX:BaseFootPrintEstimate=272901592 -XX:GCHeapFreeLimit=2 -XX:PrefetchCopyIntervalInBytes=654 -XX:PrefetchScanIntervalInBytes=748 -XX:PrefetchFieldsAhead=1 -XX:ProcessDistributionStride=3

我需要在运行程序之前进行更改.这些参数的值将动态确定，因此我需要能够反复更改这些值.该程序在docker容器内执行，并且是使用springboot开发的REST端点.
是否有某种配置文件可以动态设置这些参数，或者该如何配置?

that I need to change before running a program. The values for these parameters will be dynamically determined, thus I need to be able to change these values repeatedly. The program is executed inside a docker container and is a REST endpoint developed using springboot.
Is there some kind of configuration file where I can dynamically set these parameters or how can this be done?

推荐答案

是否存在可以动态设置这些参数的配置文件

Is there some kind of configuration file where I can dynamically set these parameters

否.

或者这怎么做?

or how can this be done?

您只需编写一些代码即可.可能是Shell脚本或Windows批处理文件.可能以其他一些脚本语言编写.甚至在Java中也可能.

You just write some code to do it. Possibly a shell script or a Windows batch file. Possibly in in some other scripting language. Possibly even in Java.

例如，它使用辅助Java程序执行动态"任务并生成一些JVM选项.然后在为实际应用程序启动JVM时提供这些信息.

For example, this uses a helper Java program to do the "dynamic" stuff and generate some JVM options. These are then supplied when launching the JVM for the real application.

#!/bin/sh
OPTS=`java com.acme.GenerateJVMOptions some parameters`
java $OPTS com.acme.TheRealApplication some more parameters

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