java GC optimization, G1GC

最新推荐文章于 2025-09-10 22:21:01 发布

转载最新推荐文章于 2025-09-10 22:21:01 发布 · 85 阅读

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原文链接：http://www.cnblogs.com/lpthread/p/3410081.html

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#java

本文介绍了Java JVM内存配置参数及优化方法，包括年轻代、老年代的大小设置，垃圾回收器的选择，以及如何减少垃圾回收暂停时间。通过具体案例展示了优化前后的JAVA_OPTS配置对比。

引用 http://www.avricot.com/blog/?post/2010/05/03/Get-started-with-java-JVM-memory-(heap%2C-stack%2C-xss-xms-xmx-xmn...)

　　-Xmx : max heap size (ex: -Xmx4g)

　　-Xms : min heap size. (ex: -Xms2g)

　　-Xmn : the size of the heap for the young generation
　　　　　　Young generation represents all the objects which have a short life of time. Young generation objects are in a specific location into the heap, where the garbage collector will pass often.

　　　　　　All new objects are created into the young generation region (called "eden").

　　　　　　When an object survive is still "alive" after more than 2-3 gc cleaning, then it will be swap has an "old generation" : they are "survivor" .
　　　　　　Good size is 33%

优化之前

　　JAVA_OPTS="-Xmn3g -Xms4g -Xmx4g -XX:PermSize=512m -XX:MaxPermSize=512m -Dsun.rmi.dgc.client.gcInterval=3600000 -Dsun.rmi.dgc.server.gcInterval=3600000"

优化之后

　　JAVA_OPTS=" -Xms4g -Xmx4g -XX:PermSize=512m -XX:MaxPermSize=512m -XX:+UseG1GC -XX:MaxGCPauseMillis=100 -XX:+ParallelRefProcEnabled -Dsun.rmi.dgc.client.gcInterval=3600000 -Dsun.rmi.dgc.server.gcInterval=3600000"

转载于:https://www.cnblogs.com/lpthread/p/3410081.html