WebLogic Server (FMW) : Generating Thread Dumps using OS commands

This post is coming from our Oracle Fusion Middleware Training where we cover Oracle WebLogic Server on Day1 . One of the performance issue that commonly encountered in poorly written application (or on not so performant Fusion Middleware infrastructure) is Stuck Threads.

Stuck Threads in WebLogic Server means a thread performing the same request for a very long time and more than the configurable Stuck Thread Max Time in WebLogic .

Thread dumps are diagnosis information that is used to analyse and troubleshoot performance related issues such as server hangs, deadlocks, slow running, idle or stuck applications etc.

How to generate Thread dumps?
In this post, I will walk you through the steps to generate Thread dumps of a server using operating system (O.S.) commands.

1. Start the server from command line script (using nohup). Let us take managed server as an example for which we need to generate the thread dumps so start the server using script as shown below.
cd $DOMAIN_HOME/bin
nohup ./startManagedWeblogic.sh <Server_name> &

2. Now identify the PID (java Process ID) for the managed server using the below command:
ps auxwww | grep –i java | grep –i <server_name> (This command is for Solaris)

3. Now run the below command to create the thread dump.
kill -3 <PID>

(This will send a signal to the process whose dump we require. This signal causes the Java Virtual Machine to generate a stack trace of the process.)

This command will create thread dump in the nohup.out file (where we started the managed server)

4. Open the nohup.out file to see generated thread dumps:

References

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About the Author Nancy Kamboj

Oracle Consultant at K21 Technologies - Oracle Gold Partner specialising in Design, Implement, and Support.

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