To use HPROF profiling on UNIX

1. Configure the Application Server using the Administration Console:

   1. Select the JVM Settings component under the relevant configuration, then select the Profiler tab.

   2. Edit the following fields:

      • Profiler Name: hprof

      • Profiler Enabled: true

      • Classpath: (leave blank)

      • Native Library Path: (leave blank)

      • JVM Option: For each of these options, select Add, type the option in the Value field, then check its box:

        -Xrunhprof:file=log.txt,options

        Here is an example of options you can use:

        -Xrunhprof:file=log.txt,thread=y,depth=3

        The file option determines where the stack dump is written in Step 2.

        The syntax of HPROF options is as follows:

        -Xrunhprof[:help]|[:option=value,option2=value2, ...]

        Using help lists options that can be passed to HPROF. The output is as follows:

        Hprof usage: -Xrunhprof[:help]|[:<option>=<value>, ...] Option Name and Value Description Default --------------------- ----------- ------- heap=dump|sites|all heap profiling all cpu=samples|old CPU usage off format=a|b ascii or binary output a file=<file> write data to file java.hprof (.txt for ascii) net=<host>:<port> send data over a socket write to file depth=<size> stack trace depth 4 cutoff=<value> output cutoff point 0.0001 lineno=y|n line number in traces? y thread=y|n thread in traces? n doe=y|n dump on exit? y

2. Restart the Application Server. This writes an HPROF stack dump to the file you specified using the file HPROF option in Step 1.