From owner-chemistry-!at!-ccl.net Wed May 17 12:30:00 2006 From: "Ross Walker ross!=!rosswalker.co.uk" 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" Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii" Date: Wed, 17 May 2006 09:24:13 -0700 MIME-Version: 1.0 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 /\ \/ |\oss Walker | HPC Consultant and Staff Scientist | | San Diego Supercomputer Center | | Tel: +1 858 822 0854 | EMail:- ross++rosswalker.co.uk | | http://www.rosswalker.co.uk | PGP Key available on request | Note: Electronic Mail is not secure, has no guarantee of delivery, may not be read every day, and should not be used for urgent or sensitive issues.