How to Generate and Analyse WebSphere Thread Dump?

As a WebSphere administrator, you should be aware of taking thread dumps and tools to analyze them.

Thread dumps are often needed to diagnose the application performance issue like deadlocks, hung threads, and bottlenecks in Java threads.

Taking Thread Dumps in WebSphere

It’s recommended to take multiple thread dumps in 5-8 seconds. You can use any of the following methods to generate it.

1. Using wsadmin.sh

[[email protected] bin]# ./wsadmin.sh  WASX7209I: Connected to process "dmgr" on node localhostCellManager01 using SOAP connector; The type of process is: DeploymentManager  WASX7029I: For help, enter: "$Help help"  wsadmin>
set jvm [$AdminControl completeObjectName type=JVM,process=server1,*]

Note: server1 is, for example. Change this to your actual JVM name.

wsadmin>set jvm [$AdminControl completeObjectName type=JVM,process=server1,*]  WebSphere:name=JVM,process=server1,platform=proxy,node=localhostNode01,j2eeType=JVM,J2EEServer=server1,version=8.5.5.0,type=JVM,mbeanIdentifier=JVM,cell=localhostCell01,spec=1.0  wsadmin>$AdminControl invoke $jvm dumpThreads

This will generate a thread dump and will be available under the profile path.

2. Using kill

# kill -3 $PID

You will find the dump in the profile path.

3. Using the WebSphere Administrative Console

generate-thread-dump-was

Once you have the thread dump, you can use the following tools to analyze them.

Analyzing WebSphere Thread Dumps

Analyzing dumps are always challenging, and following FREE tools will help you.

IBM Thread Dump Analyzer (TDA)

Using IBM TDA, you can identify hangs, deadlocks, and bottlenecks in Java threads.

You can download IBM TDA from here. It’s just the jar file, and once downloaded, you can execute the following to start the GUI.

java -jar jca457.jar

ibm-tda

It will take a few seconds, and you are all set to do the following analysis

All are available under the “Analysis” menu. A quick look at thread status analysis

tda-status

So go through the analysis you are looking for have fun with IBM TDA.

So now, you should be able to generate and analyze the thread dumps for application troubleshooting. There is more analyzer explained here.

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