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JVM-jinfo的使用
2022-07-22 10:08:00 【逍遥壮士】
jinfo是什么，可以干什么？
jinfo全称Configuration Info for Java作用是实时查看和调整虚拟机各项参数。
使用jps命令的-v参数可以查看虚拟机启动时显式指定的参数列表。
注意先 jps -l 查出进程id
相关命令查询
查看所有参数
jinfo 20220
查询CMS的配置
jinfo -flag CMSInitiatingOccupancyFraction 20220
查看jvm的参数
jinfo -flags 20220
查看java系统参数
jinfo -sysprops 20220
查看是否打开GC及详情
jinfo -flag PrintGC 20220
jinfo -flag PrintGCDetails 20220
打开gc打印
jinfo -flag +PrintGC 20220
再次查看
最后
jinfo在排查jvm问题和日常查看jvm配置的时候常用，所以用好该命令可以有助日后对jvm排查的掌握。并且jinfo可以动态的来配置jvm的参数，这样极大方便虚拟机的实时调试，不需要再重新启动的时候配置，并且也可以快速进行验证，非常方便实用。
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