how to find cpu usage by java process

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?

The way to do this is to use JMX. You can call JMX from Java code, like any other Java code. — Peter Lawrey
– Peter Lawrey, Commented Jan 7, 2014 at 11:18
Or you can do this externally using ps or reading /proc/{pid} if you have Linux. — Peter Lawrey
– Peter Lawrey, Commented Jan 7, 2014 at 11:19
i want cpu usage in percentage by java process. how can i get using JMX? — Saurav
– Saurav, Commented Jan 7, 2014 at 11:59

Community · Accepted Answer · 2020-06-20 09:12:55Z

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.

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Jan 7, 2014 at 11:31

Vipin

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3 Comments

Saurav Over a year ago

can you please check how to use getCPUUsage i am using CpuTimes.getCPUUsage but it always returns 1.0

Saurav Over a year ago

CpuTimes ct = monitor.cpuTimes(); ct.getCpuUsage(ct);

Vipin Over a year ago

@Saurav you have source code try to debug , we can not tell anything seeing one line. you can start a new question for this problem and provide your code over there I am sure you will get answer.

Aniket Thakur · Accepted Answer · 2014-01-07 11:18:52Z

0

One way would be to use

Runtime.getRuntime().exec(command);

and run top | grep java command.

answered Jan 7, 2014 at 11:18

Aniket Thakur

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Comments

Pierre Laporte · Accepted Answer · 2014-01-13 12:48:08Z

0

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 !

answered Jan 13, 2014 at 12:48

Pierre Laporte

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