NonStop Server for Java 5.0 Programmer's Reference

Profiling Techniques

When you run HPROF, consider these techniques for using options:

Do not use multiple profiling options together because each option affects performance. Using a single

option provides data closer to typical performance than multiple options.

●

Try profiling both CPU samples and CPU times; the results from each may differ.

cpu=samples

cpu=times

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Try varying the trace resolution:

Change trace depth:

depth=levels

❍

Remove line numbers:

lineno=n

❍

Add threads:

thread=y

❍

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To determine whether the program uses a complex multithreaded scheme, use the monitor option

monitor=y

An empty result list is good.

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Using HPjmeter

You can use the HPjmeter for profiling your application.

On the NonStop server platform, HPjmeter allows you to view profiler data graphically. You can obtain

HPjmeter without charge from HP.

To use HPjmeter, the dump file must be an ASCII text file and must be produced by NonStop Server for Java 5

after a normal termination or exception termination. If your application terminates with a signal, NonStop

Server for Java 5 will not generate the dump file.

For more information about HPjmeter including links for an HPjmeter tour and downloading, see HPjmeter

Overview and Features (http://www.hpjmeter.com).

For more information about java, see the NonStop Server for Java Tools Reference Pages.

NonStop Server for Java 5.0 Programmer's Reference (540385-001)