Serious performance problems with IMAP

Question

Hi,
our Groupwise server runs on SLES10 SP4, has about 2500 accounts in 7 postoffices, one gwia, one mta and webaccess.
When IMAP is activated on the gwia, the cpu load goes to 99% after a couple of hours, making the server unusable. When I turn IMAP off the cpu load is stable under 1%.
We have already limited the number of items per folder to 1000.
Where do I look? What do I do? I'm at my wits end!!!
Mike

Answer 1

On 1//20/2012 7:05 AM, Steven Eschenburg wrote:
> We were having a similar issue with our 8.0.2 GWIA running under Windows
> Server 2008 on a VM, and adding a second CPU cut the CPU utilization
> down substantially.
>
>
> >>> tgm its<[email protected]> 1/20/2012 7:36 AM >>>
>
> konecnya;2169415 Wrote:
> > In article <[email protected]>, Tgm its wrote:
> > > When IMAP is activated on the gwia, the cpu load goes to 99% after a
> > > couple of hours, making the server unusable.
> > >
> > Is this just a single core single CPU system? If not make sure you are
> > running the SMP kernel.
> > uname -a
> >
> Yes, it is a single core singel CPU system. It's a virtual machine on a
> SLES10 xen host.
> uname -a:
> Linux gw1 2.6.16.60-0.85.1-xen #1 SMP Thu Mar 17 11:45:06 UTC 2011
> x86_64 x86_64 x86_64 GNU/Linux
>
> konecnya;2169415 Wrote:
> >
> > confirm that it is actually GWIA using up all that CPU and not
> > something else or a mix of things. Knowing what exactly is busy will
> > help.
> > top
> >
> > With 'top' if you have enough width to your terminal session, hitting
> > 'c' will tell you which POA is the offender if one is being the
> > problem.
> >
> Yes, I'm sure its gwia and not a postoffice. Gwia is using 99% of the
> cpu time.
>
> konecnya;2169415 Wrote:
> >
> > As per Michael, do make sure maintenance has been run on all the Post
> > Offices and do so from the top-down approach as per TID 3347260
> > (formerly TID 10007365)
> >
> http://www.novell.com/support/dynami...rd=nonthreaded
> <http://www.novell.com/support/dynamickc.do?cmd=show&forward=nonthreaded>
> > KC&docType=kc&externalId=3347260&sliceId=1
> > If you don't have most of this automated, I wrote up the steps a while
> > back that still does the trick, ideally not running them all at the
> > same time on that system.
> > 'GroupWise Maintenance' (http://www.konecnyad.ca/andyk/gwmnt5x.htm)
>
> Mike
>
>
> --
> tgm_its
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>
>
Yes, this would be my next step. You do have a fair amount of users. Is
allocating another core an option?