How to Monitor Heap Size or JVM WebSphere Application Server Usage

JVM WebSphere Application Server heap size usage how can be monitored? So, here are few easy steps that can be performed to achieve this requirement:

• Create a file named as, showHeapSize.py and add the following code than save and exit:

serverJVM=AdminControl.completeObjectName(‘type=JVM,process=’ + sys.argv[0] + ‘,*’)
serverJVMObj=AdminControl.makeObjectName(serverJVM)
perf=AdminControl.completeObjectName(‘type=Perf,process=’ + sys.argv[0] + ‘,*’)
perfObj=AdminControl.makeObjectName(perf)
jvmObj=AdminControl.invoke_jmx(perfObj,’getStatsObject’,[serverJVMObj,java.lang.Boolean(‘false’)],[‘javax.management.ObjectName’,’java.lang.Boolean’])

currentHeapsize=jvmObj.getStatistic(‘HeapSize’).getCurrent()
usedMemory=jvmObj.getStatistic(‘UsedMemory’).getCount()
usage=float(usedMemory)/float(currentHeapsize)*100

print sys.argv[0] + “.> “+str(currentHeapsize)+”K .> “+str(usedMemory)+”K .> “+”Usage:%.2f” % usage+”%”

• Place the above file to directory /opt/jars/
• Create a new file named heap.sh, paste the below lines (modify according to your environment), and place to /opt/scripts/ directory.

echo “WAS Profile 1 Start”
/opt/WAS9/IBM/WebSphere/AppServer/bin/wsadmin.sh -lang jython -f /opt/jars/showHeapSize.py server1 -username wasadmin -password password;
echo “WAS Profile 1 End”
echo “WAS Profile 2 Start”
/opt/WAS9/IBM/WebSphere/AppServer/profiles/AppSrv02/bin/wsadmin.sh -lang jython -f /opt/jars/showHeapSize.py server1 -username wasadmin -password password;
echo “WAS Profile 2 End”

• Run the script from terminal. JVM websphere application server results will be displayed as mentioned below:

Download sample code here.