A. Check Java version:

JAVA_PATH/bin/java -verson

Ensure that it shows "Java 8"

Example: java -version

java version "1.8.0"

Enable LNT on the Linux shell:

export IBM_NATIVETOOLS=memory_tracking

This option enables the memory tracking.

export PROFILER_WRITE_PERIOD_SECONDS=n

where "n" is the duration in seconds between writes. By default, data is written every 600 seconds (ten minutes)

export PROFILER_STACK_DEPTH=n

where "n" specifies how many frames will be listed in the stack trace. By default, the stack depth is 7.

Start your java application as normal. For example: java Helloworld

Tracker output is redirected to the output file, native_memory_PID.log in the application's working directory. Please ensure there is ample space in the filesystem for this large file.

Monitor the process size until it grows sufficiently large. You can use the top -p PID command to monitor the virtual and physical memory usage.

top -p PID -d delay-time -n iterations

where PID is the process id, delay-time is the time between writes, and iterations is the number of writes

For instance, to monitor a java process id, 10303, every ten minutes for a two days enter:

top -p 10303 -d 600 -n 288 -b >> process_size.log


Once the process size grows to three times the application's Xmx (max heap) value, gracefully exit the application.

Package the process_size.log and native_memory_PID.log

tar -cf - process_size.log native_memory_PID.log | gzip -c >PMR.MM-DD-YY.tgz

where PMR is the pmr number (ex. 44722,333,000)
and MM-DD-YY is the month, day, and year

Upload the packaged data or individual files to an IBM secured server using one of upload options provided on the "MustGather: How to upload diagnostic data and testcases to IBM" web page:

http://www-01.ibm.com/support/docview.wss?uid=isg3T1022619