Measuring memory and CPU used by a Java console application with java.lang.management

Question

I need to measure how much memory and CPU my application is using at the moment, and I need to measure that from the very same application. Any advices how to do that? I've been using jconsole, but I can't find an API which would enable me to use it from a console application.

Thanks.

EDIT: As the user aix recommended, I'm using java.lang.management to achieve my goal. However, I have few questions about it. This is the code I wrote:

MemoryMXBean bean = ManagementFactory.getMemoryMXBean();
MemoryUsage memoryUsage = bean.getHeapMemoryUsage();
double used = (double)memoryUsage.getUsed() / (1024 * 1024); // in MB
double max = (double)memoryUsage.getMax() / (1024 * 1024); // in MB

I'm calling this from the application that I want to measure. What exactly does this measure? Memory taken by the whole application? By the current thread?

NPE · Accepted Answer · 2011-06-08 10:00:52Z

3

It sounds like you're looking for the Java Virtual Machine Monitoring and Management API.

In particular, take a look at MemoryMXBean and ThreadMXBean.

answered Jun 8, 2011 at 10:00

NPE

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2 Comments

Ivan Over a year ago

This will help, thanks! Can you please look at my updated question?

NPE Over a year ago

@Ivan: AFAIK there's no such metric as "heap used by thread X" (how would you attribute objects that are shared by several threads or passed between threads).

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