Java Profiling¶

• Table of contents
• Java Profiling
  • YourKit Java Profiler
    • Profile the cdmserver (cdmlib-remote-webapp)
    • creating a snapshot from within an application
  • TPTP

YourKit Java Profiler¶

Profile the cdmserver (cdmlib-remote-webapp)¶

Preparation:

To enable profiling on remote server you just need to copy appropriate libyjpagent.so and, put it into LD_LIBRARY_PATH and add "-agentlib:yjpagent" to JVM parameters. Most probable you copied wrong library file, that's why server JVM doesn't start.

( For another way to specify the shared lib see http://www.yourkit.com/docs/java/help/agent.jsp )

For your convenience you can use the following script to start eclipse and set the LD_LIBRARY_PATH:

#!/bin/bash

###########################################
# Configuration
#

ECLIPSE_FOLDER=~/opt/eclipse-juno-SR2
YOURKIT_FOLDER=~/opt/yjp-9.0.8
OS_TYPE="linux-x86-64"

#
###########################################

export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:${YOURKIT_FOLDER}/bin/${OS_TYPE}
$ECLIPSE_FOLDER/eclipse -vmargs -Duser.name="a.kohlbecker"

Run cdmlib-remote-webapp in profiling mode:

Use the launch configuration cdmserver - profile which is distributed via the cdmlib source control.

creating a snapshot from within an application¶

IMPORTANT: Add yjp.jar from the yourkit lib folder to the classpath. Do not move it from it's original location!!!!.

Capture a snapshot by

com.yourkit.api.Controller controller = new Controller();
controller.forceGC(); // decreases snapshot size and makes finding memory leaks easier
controller.captureMemorySnapshot();

if you whant to do multiple snapshots you can also use the static method:

ProfilerController.memorySnapshot()

or create a method like the following in the class to be tested:

    private void captureMemorySnapshot() {
        if (controller == null) {
            try {
                controller = new Controller();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        try {
            controller.forceGC();
            logger.info("capturing snapshot ... ");
            logger.info("new snapshot file: " + controller.captureMemorySnapshot());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

TPTP¶

_Using TPTP is discouraged, we rather recommend using the YourKit Java Profiler

in Eclipse by using TPTP.

• Install TPTP as eclipse plugin using Eclipse update site Help -> Software updates -> Find and Install -> Search for new features to install -> check Europa Discovery Site" -> TPTP and select required or check "TPTP

• Download and extract "Agent Controller" from http://www.eclipse.org/tptp/home/downloads/

• execute bin\SetConfig.bat in extracted package. Set path to Java 1.5 (for cdmlib projects ?).

• execute bin\RAServer.exe to start the Agent

• start profiling from within eclipse ...