Oracle-L: RE: RAC system Calls

From: Gogala, Mladen <MGogala_at_oxhp.com>
Date: Fri, 11 Jul 2003 06:09:54 -0800
Message-ID: <F001.005C45CE.20030711060954@fatcity.com>

Just for fun, have you tried using truss to find out which calls are being used? That might help you.

Mladen Gogala
Oracle DBA
Phone:(203) 459-6855
Email:mgogala_at_oxhp.com

-----Original Message-----
Sent: Thursday, July 10, 2003 8:14 PM
To: Multiple recipients of list ORACLE-L

Raj,
Yes. Timed_statistics=true. But I see the 'times' even in single instance(non-rac)database but relatively called negligible number of times.
-Ravi.
--- "Jamadagni, Rajendra"
<Rajendra.Jamadagni_at_espn.com> wrote:
> You seem to have timed_statistics=TRUE right ?? in
> RAC you will ALWAYS see
> GCS pings ... basically as long as
> cluster_database=true, even if only one
> node is running, you will still see Oracle trying to
> ping other instances.
>
> My guess is that's what is happening ... but I could
> be very well wrong, I
> have RAC experience, but never tried to truss the
> top processes.
>
> Raj
>

> ----
> Rajendra dot Jamadagni at nospamespn dot com
> All Views expressed in this email are strictly
> personal.
> QOTD: Any clod can have facts, having an opinion is
> an art !
>
>
> -----Original Message-----
> Sent: Thursday, July 10, 2003 12:30 PM
> To: Multiple recipients of list ORACLE-L
>
>
> Hello List,
>
> We are running Benchmark tests on Solaris 2-Node
> RAC.
> Consistently noticed the following :
> - Very high Kernel usage (averaging 45%) on TOP
> - Statspack has "IPC Send Completion sync" waits
> (70%
> Total ela time)
> - On trussing top process, found Oracle to be
> issuing
> huge number of "times" system calls in addition to
> read/writes(which I think are select/inserts).
> Has anyone noticed this in your environment. I am
> guessing these to be inter-instance pings, but could
> not get any hits in Doc/Metalink to confirm this.
> "times" call is clocking lot of CPU. Is this normal
> ?
> Any pointers would be helpful ? If this is out of
> context, is there a separate list for RAC?
>
> Thanks,
> Ravi.
>
>
>
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Author: Ravi Kulkarni
  INET: nandagokul_at_yahoo.com

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Author: Gogala, Mladen
  INET: MGogala_at_oxhp.com

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Received on Fri Jul 11 2003 - 09:09:54 CDT