Re: Memory leaks and increased processor utilization

Tech-Archive recommends: Fix windows errors by optimizing your registry

From: Rich Matheisen [MVP] (richnews_at_rmcons.com.NOSPAM.COM)
Date: 04/25/04 

Date: Sun, 25 Apr 2004 11:57:14 -0400

"Kevin" <anonymous@discussions.microsoft.com> wrote:

>I am helping a client with a problem on his Exchange 2000 Server running on a Win2K DC.

runing exchange on a gc isn't always a good idea.

>It appears the server has a memory leak in that after time, more and more of the memory gets used and we have to either 1) stop and restart the information store and/or 2) restart the server. The box is currently patched up to Win2K SP4/ Exchange SP3 + September 2003 Post SP3 Rollup.

so, what makes you think it's a memory leak? normal behavior of the
store.exe it to use as much of the installed ram as possible, leaving
about 4.5 MB unused. this is usually evident on machines with with 1GB
or less of memory. with more memopry, the store levels off at between
900 and 1300MB of memory (both are approximate figures).

>I have attempted to use Performance Monitor to see what processes are eating up the memory. STORE.EXE is typically the culprit; but it takes a day or two for it to climb up. It seems to drive up the CPU usage as well after time.

increased cpu time isn't usual. but you don't say how many processors
you have, how fast they are, how much memory's installed, how many
users are active, etc. without a baseline perfmon to compare things
to, figuring out what's not right is sometimes not easy.

>After a reboot, the CPU usually only uses 1-4%. If you check it a day or two later, it is hovering between 50-75% with spikes reaching 100% percent.

i'm guessing you have eithe one or two cpu's in the machine (leaning
towards one, actually).

which threads are using the cpu? is it spread over quite a few, or
concentrated in two or three? if it's a small number, you may have a
mail loop caused by a rule in a mailbox. 

-- 
Rich Matheisen
MCSE+I, Exchange MVP
MS Exchange FAQ at http://www.swinc.com/resource/exch_faq.htm

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