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jvm 调试

[gc触发流程](https://upload-images.jianshu.io/upload_images/2184951-b2c677f3d53a2d93.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1000/format/webpl)

jvm 调试

# 生产参数调试 -XX:+UseParallelGC 开启此参数使用parallel scavenge & parallel old搜集器（server模式默认值） -XX:+UseParallelOldGC 开启此参数在年老代使用parallel old搜集器 -XX:ParallelGCThreads=4 回收时开启的线程数。默认与CPU个数相等。

https://stackoverflow.com/questions/6236726/whats-the-difference-between-parallelgc-and-paralleloldgc https://stackoverflow.com/questions/198577/real-differences-between-java-server-and-java-client http://developer.51cto.com/art/201009/228035.htm

jvm 调试

# jvm 源码下载 ``` The repository is linked on http://openjdk.java.net/. Clone it and execute theget_source.sh script. $ hg clone http://hg.openjdk.java.net/jdk8/jdk8 $ cd jdk8 && sh get_source.sh hg clone http://hg.openjdk.java.net/jdk10/jdk10 &&...

jvm 调试

# jvm 命令参数 java -XshowSettings:vm -version 显示设置

jvm 调试

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