Thursday Mar 20, 2014

Why do I need to collect several thread dumps?

I used to work with samurai to read thread dumps

http://samuraism.jp/samurai/en/index.html

But I don't miss him any more after I met thread logic :).

You can read more and download about Threadlogic here:

https://java.net/projects/threadlogic

It also provide excellet guidelines on what is happening in the environment.

But, again Why do I need to collect several thread dumps?

One question for you, Do you understand a video when you see just one screenshot? probably no, even if you have one picture from 'The End'.

Even if you don't see the movie, if you see several screenshots, you can get a better idea of what happened at some time.

Lets say that the most important part of the film for you was the end, if you have several pictures from that time, you will have a very good idea of how the movie finished.

The same is for weblogic server. If we see five thread dumps 10 or 20 seconds apart from each other when one issue occurs, we can have a very good idea of what methods were being executed when one issue occurs.
We can see what weblogic server is waiting for. This helps to identify slowness in subsystems like databases, web services or bugs in weblogic server or other products that were being executed at the time of the issue.

Enjoy!
About


My name is Luz Mestre. I work as Principal Technical Support Engineer at Oracle Support. I'll post here the most interesting challenges I have in my daily work. The views expressed on this blog are my own and do not necessarily reflect the views of Oracle.

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