synm
commented
7 years ago JAVA8 CompletableFuture RxJava Fiber-Quasar Vertx-sync
Open synm opened 10 years ago
synm
commented
7 years ago JAVA8 CompletableFuture RxJava Fiber-Quasar Vertx-sync
info: 查看Java进程的栈空间大小:sudo -u tomcat /home/java/default/bin/jinfo -flag ThreadStackSize ${PID} 查看是否使用了压缩指针:sudo -u tomcat /home/java/default/bin/jinfo -flag UseCompressedOops ${PID} 查看系统属性:sudo -u tomcat /home/java/default/bin/jinfo -sysprops ${PID} jstack: top -p -H 查看cpu占用过高的线程.
查看一个指定的Java进程中的线程的状态:sudo -u tomcat /home/java/default/bin/jstack ${PID}
jstat:
查看gc的信息:sudo -u tomcat /home/java/default/bin/jstat -gcutil ${PID}
jmap&mat
sudo -u tomcat /home/java/default/bin/jmap -histo:live ${PID}
堆空间中各个年龄段的空间的使用情况:sudo -u tomcat /home/java/default/bin/jmap -heap ${PID} jmap指定的dump文件一定要是tomcat用户可写，比如可以新创建一个文件夹 sudo mkdir /home/memdump sudo chown tomcat:tomcat /home/memdump sudo -u tomcat /home/java/default/bin/jmap -dump:live,format=b,file=/home/memdump/memMap.20140820.hprof ${PID}