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IDS Forum

RE: CPU load balancing - Tru64

Posted By: Dirk Cornelis Moolman [ MTN - Innovation Centre ]
Date: Wednesday, 31 August 2011, at 5:59 a.m.

In Response To: Re: CPU load balancing - Tru64 (Fernando Nunes)

"- Be careful when looking at each process memory because"

I can still use this to get a general overall view, correct ? It should be accurate enough to still show me which applications are more memory intensive than others, even if not 100% accurate.

> -----Original Message-----
> From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of
> Fernando Nunes
> Sent: Wednesday, 31 August 2011 11:46 AM
> To: ids@iiug.org
> Subject: Re: CPU load balancing - Tru64 [24780]
>
> I'm not sure if I'm missing some peace of context (I noticed there are
> other
> messages from you).
> In any case, that could happen for example if you had only 3 CPUVPs on
> an
> Informix instance.
> The software would not be able to saturate more than 3 CPUs. I think
> you
> would see that the set of 3 would not necessarily be the same 3 (e.g.
> cpu0,
> cpu1, cpu2) every time. But this could depend on CPU affinity.
>
> When you have free CPU and things are slow you should always consider
> other
> sources of contention (like I/O, swap etc.)
>
> Regarding your questions on another post:
>
> - Be careful when looking at each process memory because:
> - The processes that use shared memory cannot be added (since the
> memory
> they are referencing is shared among them). I assume this is clear, but
> I've
> seen too many people making this basic mistake
> - The RSS can (and probably will) include memory that is shared among
> the
> processes. I'm not talking about "shared memory" segments but things
> like ,
> code segments etc.
> - On Tru64 there is a parameter called something like "swap eager" (see
> /etc/sysconfigtab) that defines how it uses swap. If it's set to "1"
> every
> memory allocation will mean the same ammount of swap reservation. If
> your
> swap space is low you can consume it in "reserverd". This may never be
> used
> but if the swap space is exhausted (even for reserved space) the OS may
> start killing processes.
> - I've seen performance problems that were attributed to advfs issues,
> although I never had a proper explanation. But it would happen when you
> have
> large file systems full of small files (many, many thousands or
> millions).
> I've seen machines that have slow response, although the CPU usage is
> low
> - Having too many processes (thounsands) apparently also can cause
> problems. There are settings that change the process table sizes, but I
> never changed them. Not sure if it helps. This translated in slow
> response
> and commands like "ps" took very long time and consumed too many CPUs
>
> If you want to share your concerns, maybe we can be more useful. If you
> already did it, I probably missed it, so I apologize.
>
> Regards.

> On Wed, Aug 31, 2011 at 10:16 AM, Dirk Cornel....
> <moolma_dc@mtn.co.za>wrote:
>
> > Another Unix question (also on Tru64):
> >
> > I used the "cpuinfo" command to monitor each CPU individualy. But the
> > picture
> > I get does not make 100% sense to me.
> >
> > Let's say there are 10 cpu's. What I am seeing is, 3 of those cpu's
> are
> > very
> > busy, and the other 7 are idle. Should Unix not be load balancing
> (context
> > switching) ?
> >
> > Because this now means, when I run a sar, I see 85% idle time, which
> means
> > in
> > total the server is not very busy, but 3 of the cpu's are running
> flat out.
> >
> > This would cause problems, would it not ?
> >
> > Dirk
> >
> > ________________________________
> > 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.
> >
> >
>
> --
> Fernando Nunes
> Portugal
>
> http://informix-technology.blogspot.com
> My email works... but I don't check it frequently...
>
> --0016364d1f8d45020104abc9ff72
>
>
> ***********************************************************************
> ********
> Forum Note: Use "Reply" to post a response in the discussion forum.

NOTE: This e-mail message is subject to the MTN Group disclaimer see http://www.mtn.co.za/SUPPORT/LEGAL/Pages/EmailDisclaimer.aspx

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