如何通过Java进程查找CPU使用率

Question

I want to moniter cpu usage of some java application. I don't want to use tools like jconsole (JMX)

if there is any way to check by java code?

Answer 1

Use JavaSysMon

Currently it reports:

• Process table (also available as a tree), including pid, ppid, name, command line, user, process size, resident process size, user time, and kernel time.
• Uptime
• Current process's pid
• Total and free RAM
• Total and free swap
• CPU usage
• CPU frequency
• Number of CPUs

Also you can use jmx mbeans or get PID using Runtime.exec() and using that call platform-specific command like ps.

Answer 2

One way would be to use

Runtime.getRuntime().exec(command);

and run top | grep java top | grep java command.

Answer 3

You should retrieve the MX Bean ThreadMXBean from the Java class itself and use the methods get*CpuTime() .

Otherwise, you can use good old top and grep on your Java process PID.

If you are brave enough, there is also perf tool in linux-tools package.

Hope that helps !