JVM参数模版

首先需要自己根据机器的配置设置JVM中各区域的初步大小，如下：

-Xms4096M
-Xmx4096M
-Xmn3072M
-Xss1M
-XX:MetaspaceSize=256M
-XX:MaxMetaspaceSize=256M

接着需要指定垃圾回收器，G1的话，其实可调优不多，一般使用停顿时间参数就好，所以这里使用ParNew+CMS，参数如下：

-XX:+UseParNewGC
-XX:+UseConcMarkSweepGC
-XX:CMSInitiatingOccupancyFraction=92
-XX:CMSScavengeBeforeRemark
-XX:UseCMSCompactAtFullCollection
-XX:CMSFullGCsBeforeCompaction=0
-XX:+CMSParallelInitialMarkEnabled

然后在加上一些通用参数，比如说禁用主动GC(慎用，有时候可能会影响到堆外内存的回收)，打印GC详细日志保存，以及内存溢出时dump文件等：

-XX:+DisableExplicitGC
-XX:+PrintGCDetails
-XX:+PrintGCTimeStamps
-Xloggc:gc.log
-XX:+HeapDumpOnOutOfMemoryError
-XX:HeapDumpPath=./oom

最终参考JVM参数模版如下：

-Xms4096M
-Xmx4096M
-Xmn3072M
-Xss1M
-XX:MetaspaceSize=256M
-XX:MaxMetaspaceSize=256M
-XX:+UseParNewGC
-XX:+UseConcMarkSweepGC
-XX:CMSInitiatingOccupancyFraction=92
-XX:CMSScavengeBeforeRemark
-XX:UseCMSCompactAtFullCollection
-XX:CMSFullGCsBeforeCompaction=0
-XX:+CMSParallelInitialMarkEnabled
-XX:+DisableExplicitGC
-XX:+PrintGCDetails
-XX:+PrintGCTimeStamps
-Xloggc:gc.log
-XX:+HeapDumpOnOutOfMemoryError
-XX:HeapDumpPath=./oom

---------------------------------------------------------

-XX:CompressedClassSpaceSize=128M -XX:MetaspaceSize=128M -XX:MaxMetaspaceSize=256M -Xms1024M -Xmx1024M -Xmn384M -XX:SurvivorRatio=8 -XX:+DisableExplicitGC -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:+UseCMSCompactAtFullCollection -XX:CMSFullGCsBeforeCompaction=10 -XX:+CMSClassUnloadingEnabled -XX:+CMSParallelRemarkEnabled -XX:+UseCMSInitiatingOccupancyOnly -XX:CMSInitiatingOccupancyFraction=70 -XX:TargetSurvivorRatio=90 -XX:MaxTenuringThreshold=15 -Djava.rmi.server.hostname=10.129.14.69 -Dtomcat.working.group=rm -XX:-ReduceInitialCardMarks -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/opt/log/start/dump/heap.hprof.2021-07-27_11-29-53 -XX:+PrintGCDetails -XX:+PrintGCDateStamps -Xloggc:/opt/log/start/gc/gc.log.2021-07-27_11-29-53 -XX:MaxDirectMemorySize=128M

转自 https://blog.csdn.net/weixin_38106322/category_9681695.html