Slow first time execution. Need to preload?

madeonmoon Nov 11, 2005 12:09 PM

Hello all,

I have a J2EE app deployed in Jboss and most of the processing is done within JMS components (via message-drive beans). I've heard user complains saying that the first time a particular jms message is processed, processing times are significantly slower than subsequent runs (8 seconds vs 200 milliseconds). I am not sure where exactly the bottleneck could be.

Can anyone please:

1) suggest how to profile the app run to see what part of the code takes long to execute upon first run?

2) ideas on determining the bottlenecks during first time execution

3) give pointers on pre-loading J2EE components, etc

Thanks a lot
James

1. Re: Slow first time execution. Need to preload?

the-gtm Nov 11, 2005 2:09 PM (in response to madeonmoon)

8s is a long time, looks like the client is trying to connect to a machine that doesn't exist. After the timeout has expired it somehow manages to reach the server. Several server names in your config files ?
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2. Re: Slow first time execution. Need to preload?

triathlon98 Nov 13, 2005 3:27 PM (in response to madeonmoon)

You may want to check your dns settings. Even when connecting to the server using an ip address, it is important to have reverse dns working for that ip address. On soms systems, this can cause sporadic (first and some intermediate) delays if reverse dns lookup fails.

Joachim
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