Hi Shreepad,
I would strongly support Steve "Guru" Adams in not binding Oracle processes
to CPU unless they have real-time priority. The problem is this : Although
you may save on context switching, you are necessarily telling the process
that it can only use one particular CPU even if others are available. What
this means is that (unless it has real-time priority) the bound process
*cannot* kick out another process that is holding the CPU and is executing
some code that does not require it to context switch (i.e. it is not
requesting I/O). If the other process was a CPU bound job, it will not
relinquish the CPU until it finished it's time slot - a series of such jobs
will effectively take away the gains that you obtain by saving on context
switches.
Liken this to going to a particular counselor (for whatever advise) - you
don't need to explain your woes everytime since he or she already knows your
case (i.e. no context switching). However, you may *possibly* have to wait
for a long time in case another 'chatty' counselee (is there such a word?)
is occupying your counsellor (i.e. a CPU intensive process) and will not get
out unless kicked out due to expiration of the time slot.
In short: Processor binding works (when supported by the OS) well *only* for
CPU bound tasks not for a CPU-I/O combination-type process such as the
Oracle backgound processes. And before I quit : YMMV.
Hth,
John Kanagaraj
PS: Haven't I heard of you at the Revealnet pipeline?
>-----Original Message-----
>From: Steve Adams [mailto:[EMAIL PROTECTED]]
>Sent: Tuesday, May 22, 2001 6:50 AM
>To: Multiple recipients of list ORACLE-L
>Subject: RE: Binding a process to a CPU .
>
>
>Hi Shreepad,
>
>Please see http://www.ixora.com.au/q+a/cpu.htm#15_10_1999.
>
>@ Regards,
>@ Steve Adams
>@ http://www.ixora.com.au/
>@ http://www.christianity.net.au/
>
>
>-----Original Message-----
>Sent: Tuesday, 22 May 2001 22:16
>To: Multiple recipients of list ORACLE-L
>
>
>
>
>Hi,
>I wish to test Parallel Query .
>
>HP-UX 10.2 K Class machines , 4 CPU 2 GB RAM , Oracle 7.3.4.4
>
>When the background processes are created , Can I bind ( a slave
>process related to Parallel query server) them to a specific CPU . ?
>Is this Possible .?
>Has anyone checked this out .? Any Problems.
>
>
> shreepad.
>--
>Please see the official ORACLE-L FAQ: http://www.orafaq.com
>--
>Author: Shreepad Vaidya
> INET: [EMAIL PROTECTED]
>
>Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
>San Diego, California -- Public Internet access / Mailing Lists
>--------------------------------------------------------------------
>To REMOVE yourself from this mailing list, send an E-Mail message
>to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in
>the message BODY, include a line containing: UNSUB ORACLE-L
>(or the name of mailing list you want to be removed from). You may
>also send the HELP command for other information (like subscribing).
>--
>Please see the official ORACLE-L FAQ: http://www.orafaq.com
>--
>Author: Steve Adams
> INET: [EMAIL PROTECTED]
>
>Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
>San Diego, California -- Public Internet access / Mailing Lists
>--------------------------------------------------------------------
>To REMOVE yourself from this mailing list, send an E-Mail message
>to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in
>the message BODY, include a line containing: UNSUB ORACLE-L
>(or the name of mailing list you want to be removed from). You may
>also send the HELP command for other information (like subscribing).
>
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: John Kanagaraj
INET: [EMAIL PROTECTED]
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
San Diego, California -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from). You may
also send the HELP command for other information (like subscribing).
