代码无改动,有一台机器ygc time 突然变长,然后又恢复了。
不知哪位大神可以指导下,应该如何进行分析啊?需要考虑哪些情况会引起这种问题呢?
jvm 参数配置如下:
-Xloggc:/var/logs/gc.log.201803072057 -XX:ErrorFile=/var/logs/vmerr.log.201803072057 -Xmx4g -Xms4g -XX:SurvivorRatio=8 -XX:NewRatio=3 -XX:PermSize=512m -XX:MaxPermSize=512m -XX:+HeapDumpOnOutOfMemoryError -XX:+DisableExplicitGC -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintCommandLineFlags -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:ParallelCMSThreads=8 -XX:+CMSClassUnloadingEnabled -XX:+UseCMSCompactAtFullCollection -XX:CMSFullGCsBeforeCompaction=1 -XX:CMSInitiatingOccupancyFraction=50 -XX:+UseCMSInitiatingOccupancyOnly -XX:HeapDumpPath=/var/logs/heaperr.log.201803072057