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The HPROF Profiler

114 iPlanet Web Server, Enterprise Edition Programmer’s Guide to Servlets • May 2001

Also, update the PATH and NSES_CLASSPATH system variables to include the

profiler’s own jar files and dll files.

The HPROF Profiler

HPROF is a simple profiler agent shipped with the Java 2 SDK. It is a dynamically

linked library that interacts with the JVMPI and writes out profiling information

either to a file or to a socket in ASCII or binary format. This information can be

further processed by a profiler front-end tool such as HAT.

HPROF can present CPU usage, heap allocation statistics, and monitor contention

profiles. In addition, it can also report complete heap dumps and states of all the

monitors and threads in the Java virtual machine. For more details on the HPROF

profiler, see the JDK documentation at:

http://java.sun.com/products/jdk/1.2/docs/guide/jvmpi/jvmpi.html#hprof

To use HPROF profiling on Unix, follow these steps:

1. To enable HPROF profiling, edit the jvm12.conf file as shown here:

Suggested options for using iPlanet Web Server with HPROF are:

jvm.option=-Xrunhprof:file=/tmp/hprof.txt,heap=all,format=a

or:

jvm.option=-Xrunhprof:file=/tmp/hprof.txt,cpu=samples,format=a

NOTE If any of the configuration options are missing or incorrect, the

profiler may experience problems that affect the performance of the

iPlanet Web Server.

jvm.printErrors=2

jvm.profiler=hprof

jvm.option=-Xrunhprof:options

#jvm.option=-Xrs must be commented out

java.compiler=NONE

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Red Hat NETSCAPE ENTERPRISE SERVER 6.0 - NSAPI PROGRAMMER GUIDE Manuale Utente Pagina 114