java.lang.Object wait() CPU use?

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Question by Dean R. · Dec 06, 2014 at 09:50 AM ·

java.lang.Object wait() CPU use?

We have an app that under high load we are seeing significant CPU use attributed to java.lang.Object wait() when making Web Service calls waiting for a response. My understanding is that wait() shouldn't be a consumer of CPU - is that correct or is there something about how dynaTrace attributes CPU use to what is basically a native code call? We are using an IBM 1.7 JVM

This is an example of what I'm referring to - is wait() actually using 759.65ms of CPU?

Thanks,

Dean

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Answer 1 · 2014-12-09T03:48:25Z

Answer by Dean R. · Dec 09, 2014 at 03:48 AM

Thanks Andreas

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Answer 2 · 2014-12-07T07:58:06Z

Answer by Andreas G. · Dec 07, 2014 at 07:58 AM

Hi Dean

Thats an interesting observation. You are right that wait should spend most of its time in actual wait. I just googled for that and found some intereseting discussions on stackoverflow, e.g: http://stackoverflow.com/questions/8656912/cpu-usage-and-object-wait, http://stackoverflow.com/questions/15990779/high-cpu-within-object-wait

I will bring this to the attention of our engineers. Maybe they have an explanation for this

Andi

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java.lang.Object wait() CPU use?

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