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IDS Forum

Re: CPU load balancing - Tru64

Posted By: Art Kagel
Date: Wednesday, 31 August 2011, at 9:42 a.m.

In Response To: RE: CPU load balancing - Tru64 (Dirk Cornelis Moolman [ MTN - Innovation Centre ])

This sounds like a process aging problem. TRU64 may be aggressive about
reducing the run time priority of long running processes. Your app server
applications sound like they start up and keep running forever which would
bring them to the attention of the OS's priority aging algorithms. One of
the results of this aging is that long running processes get fewer time
slices that are longer then younger processes. This will manifest as a
process that seems to stay on a single CPU/core for a long time before
migrating to another CPU. This will definitely result in pegging that CPU
to near 100% if the process does not have to wait for IO very often.

Art

Art S. Kagel
Advanced DataTools (www.advancedatatools.com)
Blog: http://informix-myview.blogspot.com/

Disclaimer: Please keep in mind that my own opinions are my own opinions and
do not reflect on my employer, Advanced DataTools, the IIUG, nor any other
organization with which I am associated either explicitly, implicitly, or by
inference. Neither do those opinions reflect those of other individuals
affiliated with any entity with which I am affiliated nor those of the
entities themselves.

On Wed, Aug 31, 2011 at 6:17 AM, Dirk Cornel.... <moolma_dc@mtn.co.za>wrote:

> > -----Original Message-----
> > From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of
> > Obnoxio The Clown
> > Sent: Wednesday, 31 August 2011 12:02 PM
> > To: ids@iiug.org
> > Subject: Re: CPU load balancing - Tru64 [24783]
> >
> > On 31/08/2011 10:56, Dirk Cornel.... wrote:
> > > " I've seen machines that have slow response, although the CPU usage
> > is low"
> > >
> > > Yes, this is what we are experiencing. So my first check were the
> > cpu's. I
> > > also looked at I/O (the I/O was good, no problems there), and the
> > memory was
> > > good (no swapping taking place on the server).
> > >
> > > So now I start to wonder, is this an inherent problem on Tru64
> > perhaps ?
> > .....
> > > the cpu's not load balancing properly ?
> > >
> > > There could be many valid explanations. This server does not only run
> > > Informix. Maybe a process binds to a cpu, and cannot be split
> > further, into
> > > multiple threads for multiple cpu's to be utilised.
> >
> > What does onstat -C show?
> >
> > --
> > Cheers,
> > Obnoxio The Clown
>
> The problem is, this is an Apps server - it only runs 4ge's, and Java
> applications - no database. And all the other servers are fine. So I think
> the
> problem is limited to this server.
>
> More frustrating is, the server would show 85% plus idle time, but they are
> complaining it is slow. We reboot only this server, and everything is fine
> again.
> This is why I started digging into processes now, seeing which are using
> the
> most memory on this server, etc.
>
> The CPU scenario I described, is also strange to me. What if the process of
> the user that is complaining, is running on one of the cpu's that are busy,
> while the server in general still has idle time ?
>
> NOTE: This e-mail message is subject to the MTN Group disclaimer see
> http://www.mtn.co.za/SUPPORT/LEGAL/Pages/EmailDisclaimer.aspx
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

--002215974c5e4e6cc304abcd4d35

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