2 Replies Latest reply on Jun 30, 2009 3:59 AM by fbrueseke

Interpreting ProcessCPU metric

fbrueseke Jun 29, 2009 4:40 AM

Hi Jopr experts,

I am currently working on how to present my measurement results. I have seen that the JXM plugin has a value that measure how much CPU time the Java process used. This value is conviently aggregated per minute by Jopr automatically.

My question is how I need to interpret this value? Usually CPU usage is expressed in percent value. So how do I convert these values?
What I have come up with so far is the following formula:

percent = ProcessCpuTimePerMinute / (ns_in_one_minute * number_of_CPUs)

I have included the number of CPUs as I have seen values larger than 60 seconds of CPU time ocasionally. Is that correct?

Kind regards
Frank

1. Re: Interpreting ProcessCPU metric

ips Jun 29, 2009 11:22 AM (in response to fbrueseke)

I'm not sure, though that sounds like a good guess to me. This is more a question for a general Java forum, since all the Jopr JMX plugin is doing is exposing the Sun-specific ProcessCPUtime attribute of the java.lang:type=OperatingSystem MBean. This is the only docs I could find on this attribute:

http://www.docjar.org/docs/api/com/sun/management/OperatingSystemMXBean.html

Another idea is to see if the source code for com.sun.management.OperatingSystemMXBean tells you anything.
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2. Re: Interpreting ProcessCPU metric

fbrueseke Jun 30, 2009 3:59 AM (in response to fbrueseke)

Hi ips,

I just assumed somehow that you know what that all means. Apprarently, you are right that I would have had better chances of an answer. After some more googling I have come up with this:
http://forums.sun.com/thread.jspa?forumID=537&threadID=5305095

Anyways, thanks for your help
Frank
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