performance in java

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jaj_developer@yahoo.co.uk - 26 Jan 2006 17:46 GMT

All,

We have a program that uses JNI to call down to some native components
(native dll [ours] using jdk1.4 and 1.5).

Is there any way that we can find out how much processor load the
JNI-native dll is taking up (windows xp)?

Currently perfmon etc only shows "java" which includes the native, is
there any way that you can see how much the native part is taking up of
the total processor load?

Thank you in advance,

Yours

Jaj

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Steve W. Jackson - 26 Jan 2006 19:52 GMT

> All,
>
[quoted text clipped - 13 lines]
>
> Jaj

Applications and their various threads consume CPU resources, not DLLs
or other such resources. So perfmon reports correctly that "java" is
consuming CPU.

Instead, what you want to look for is profiling of the application, so
that you can find out where it's spending its time. There are some
profiling facilities with Java, though whether they're useful when you
have JNI code involved I can't say.

= Steve =

Signature

Steve W. Jackson
Montgomery, Alabama

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Oliver Wong - 26 Jan 2006 20:28 GMT

>> All,
>>
[quoted text clipped - 22 lines]
> profiling facilities with Java, though whether they're useful when you
> have JNI code involved I can't say.

If you can't find a profiling tool that works well with JNI, and decide
to write your own, Java 1.5 added something called JVMTI that may help out.
See http://java.sun.com/j2se/1.5.0/docs/guide/jvmti/

- Oliver

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javabuddha@gmail.com - 26 Jan 2006 20:51 GMT

I looked at this a while back:

http://java.sun.com/developer/technicalArticles/Programming/HPROF.html

It suppose to give you both heap and CPU usage by class, but didn't
have the time to play with it yet.

Good luck,

Matt

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jaj_developer@yahoo.co.uk - 30 Jan 2006 11:08 GMT

Thanks to all.

Jaj

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performance in java

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