RE: [linuxperf] system time on SMP

["Thomas D. Barringer" <tomb@progress.com>]

Do you have any information on what the processes are that are taking the
time?  'top' will tell you this.

--
Tom Barringer
Senior Technical Consultant
Progress Software


> -----Original Message-----
> From: owner-linuxperf@nl.linux.org
> [mailto:owner-linuxperf@nl.linux.org]On Behalf Of Jochen Frey
> Sent: Monday, August 20, 2001 9:52 PM
> To: linuxperf@nl.linux.org
> Subject: [linuxperf] system time on SMP
>
>
> Hi there, I am new to this list, so please bear with me. I searched the
> list, but I might have missed stuff.
>
> The symptom: I am running performance test on a multi processor
> machine, and
> when I put it under load, the processors spend 50% of their time in user
> processes and 50% of the time in system processes (sometimes it's 60:40).
> This is not what I'd expect, I'd expect close to 85% of the time in user
> processes (realistic?).
>
> The question: Any pointers as to what the system might be doing?
> I used sar,
> and it's not swapping, there's plenty of memory (2GB) (but maybe
> not used),
> and network is not an issue.
>
> The architecture:
> * SW: LAMP (red hat 7.1, apache, mySQL, PHP) most of those in the latest
> versions.
> * HW: Dell 8450 (8 processors, 2GB Memory)
>
> The load type: Lots of brief stateless requests (short translations),
> requiring many simple 'selects' from mySQL (one table only, relatively
> simple lookups using indexes).
>
> Any pointers / suggestions / etc?
>
> Thanks so much!
> Jo
>
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