Re: Storage pools and QHTTPSVR and QUSRWRK subsystems

[Simon Coulter <shc@xxxxxxxxxxxxxxxxx>]

On 08/02/2009, at 6:49 PM, Lukas Beeler wrote:

> Doesn't SQL run in the QDBSRV* jobs?

No, they are used to rebuild the database. See
	http://archive.midrange.com/midrange-l/199804/msg00840.html
plus other sources.

> And the JVM is part of the LIC, so it probably uses the *MACHINE pool.

No, the JVM runs in the same storage pool as the job invoking it-- 
usually *BASE if no tuning has been performed. Note that Java cannot  
run in an Interactive job due to restrictions on use of multi- 
threaded tasks in interactive jobs so they run in batch but since  
they are generally invoked as Batch-Immediate jobs they run in the  
same subsystem as the invoking job.

Note that some components of JVM probably do run in the *MACHINE pool  
like some parts of other OS functions (e.g., SAV/RST) hence correct  
sizing of *MACHINE pool is critical but Java applications are subject  
to the same performance controls as other applications. The Java  
Platform supports a bunch of other performance controls too.

You''l find some useful performance information at:

	http://www.ibm.com/servers/enable/site/education/wp/8f56/8f56.pdf

Regards,
Simon Coulter.
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