[jboss-user] [Performance Tuning] - Re: Identifying performance bottlenecks

[jshrinivas]

Analyzing thread stack traces indeed proved useful. Thanks for your help. I looked at http-0.0.0.0-# threads and most of them were in WAIT/BLOCKED state. All these threads seem to be waiting for JDBC connection. Basically it seems that they are waiting on org.jboss.resource.adapter.jdbc.WrapperDataSource.getConnection method. 

During this I also realized that JBoss XA JDBC pool config is not intelligent (or I might be missing something here). I had specified min-pool-size as 200 and did not specify max-pool-size and it defaulted to 20, which was strange. I am going to post this on JCA forum. Anyways, changing max-pool-size helped a bit and I was able to get another 5% CPU utilized due to that. 

I also found out that there was a bug report on org.jboss.resource.adapter.jdbc.WrapperDataSource.getConnection being slow. I am not sure if it is fixed in 4.0.5-SP1-ejb3. 

-Shrinivas

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