RE: RAC system Calls

From: Jamadagni, Rajendra <Rajendra.Jamadagni_at_espn.com>
Date: Thu, 10 Jul 2003 09:21:37 -0700
Message-ID: <F001.005C4456.20030710091425@fatcity.com>

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

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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-----
From: Ravi Kulkarni [mailto:[EMAIL PROTECTED]] Sent: Thursday, July 10, 2003 12:30 PM
To: Multiple recipients of list ORACLE-L Subject: RAC system Calls

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
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Received on Thu Jul 10 2003 - 11:21:37 CDT