From: Green, Simon (Simon.Green@EU.ALTRIA.COM)
Date: Wed Jan 07 2004 - 14:58:17 EST
We've seen it as well on our SAP systems, following upgrades from 433 to 51
ML4. We upgraded Oracle at the same time, and just put it down as one of
those things. Didn't really cause us problems except with one system which
was suddenly short of paging space. The actual amount of paging died down
after several hours use.
It'll be nice to look forward to with 5.2, though.
Simon Green
Altria ITSC Europe Ltd
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-----Original Message-----
From: James Jackson [mailto:James.Jackson@MAIL.STATE.AR.US]
Sent: 07 January 2004 19:33
To: aix-l@Princeton.EDU
Subject: Increased memory usage with AIX 5.1.
I recently upgraded an Oracle transactional database server from AIX 4.3.3
to AIX 5.1 ML5. After the migration, the size of each Oracle user process
increased by over 1 MB, which has translated into an additional memory load
of 300-500 MB depending on the number of client connections. My already
memory-starved server has begun to page liberally on AIX 5.1, though I was
able to manage and prevent paging on AIX 4.3.3 with vmtune. Oracle and IBM
have identified a "feature" of IBM's C compiler that causes CONST data to be
loaded to the RW (unshared data) section of a process's rather than the RO
(shared text) section. IBM has developed a fix for AIX 5.2 only, and they
have no plans to backport the fix to AIX 5.1. I've not yet received an
explanation from IBM regarding what changed in the compiler and O/S between
4.3.3 and 5.1, but I hope to soon.
Has anyone else observed this increase in memory consumption on AIX 5.1?
Does anyone else have a PMR open with IBM?
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