From owner-chemistry%!at!%ccl.net Wed May 17 12:30:00 2006
From: "Ross Walker ross!=!rosswalker.co.uk" <owner-chemistry()server.ccl.net>
To: CCL
Subject: CCL:G: Running Two jobs on a shared memory computer
Message-Id: <-31771-060517122425-12497-rzScLnB16JK1ng4xaeSNwg()server.ccl.net>
X-Original-From: "Ross Walker" <ross_-_rosswalker.co.uk>
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Date: Wed, 17 May 2006 09:24:13 -0700
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Sent to CCL by: "Ross Walker" [ross]=[rosswalker.co.uk]
Dear Roger,

>     I have several shared processor opterons. At the moment I can not 
> run guassian on two shared memory processors with out it crashing.
> 
> If I try to run two jobs separately the both end up running 
> on the same 
> processor.
> 
> Is there any way to get both jobs to run on separate processors.

If by this you mean run two single processor Gaussian jobs at the same time
on a dual processor machine this should just work. The operating system
should take care of processor affinity and schedule on job (for a decent
timeslice) on one cpu and the other on the other cpu. If it is not doing
this then there is something seriously wrong with your system installation.
How do you know they are both running on the same processor?

Note 'top' by default on most versions of Linux now defaults to single cpu
mode where only the overall system stats are reported and not individually
by CPU. you can change top do display usage by cpu and also show the cpu
number on which a process is running by modifying the file .toprc in your
home directory. Here is mine:

Id:a, Mode_altscr=0, Mode_irixps=1, Delay_time=1.000, Curwin=0
Def     fieldscur=AEHIOQTWKNMbcdfgJplrsuvyzX
        winflags=30009, sortindx=10, maxtasks=0
        summclr=1, msgsclr=1, headclr=3, taskclr=1
Job     fieldscur=ABcefgjlrstuvyzMKNHIWOPQDX
        winflags=62777, sortindx=0, maxtasks=0
        summclr=6, msgsclr=6, headclr=7, taskclr=6
Mem     fieldscur=ANOPQRSTUVbcdefgjlmyzWHIKX
        winflags=62777, sortindx=13, maxtasks=0
        summclr=5, msgsclr=5, headclr=4, taskclr=5
Usr     fieldscur=ABDECGfhijlopqrstuvyzMKNWX
        winflags=62777, sortindx=4, maxtasks=0
        summclr=3, msgsclr=3, headclr=2, taskclr=3

My apologies if I misunderstood your question.

All the best
Ross

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|\oss Walker

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