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Subject: Re: ANSYS and parallel processing...
Author: Brian Breaux
Date: 1999-01-15 15:05:00

You can not do true parallel processing on a Pentium II
Brian D. Breaux
Design Engineer, Central Engineering, JEC.
281-228-7716

> From: Viktor Doundakov[SMTP:Viktor.Doundakov@R...]
> Sent: Friday, January 15, 1999 1:51 PM
> To: 'xansys@o...'
> Subject: [xansys] ANSYS and parallel processing...

> From: Viktor Doundakov

> Hi Joseph,

> I've heard that the ANSYS parallel processing is not very good (and in
> general I am told that it holds for the FEA since you work on matrixes). I
> have a dual Pentium II processor PC and if I am wrong on the subject and I
> can take advantage of parallel processing it will help me a lot since I am
> starting to run relatively big jobs.

> Anybody with info on the subject will help.

> Viktor Doundakov
> R&D Engineer
> Read-Rite Corporation
> Direct: 510-683-7495 Main: 510-683-6100 FAX: 510-683-7065
> e-mail: Viktor.Doundakov@r...

> -----Original Message-----
> From: Metrisin, Joseph T. [mailto:metrisin@p...]
> Sent: Friday, January 15, 1999 9:34 AM
> To: 'xansys@o...'
> Subject: [xansys] Re: Multiple CPU's in SUN environment

> From: "Metrisin, Joseph T."

> Geno,

> If you are looking at the CPU time printed at the bottom of the
> ANSYS output, this is the TOTAL CPU time accumulated by
> all four processors. In other words, your job still takes nearly
> the same amout of CPU time to solve, it's just spread out over
> the various processors. If you look at the elapsed time, it
> will probably show that it solved in roughly 1/4 of the wall clock
> time.

> Joseph T. Metrisin

> Structural Methods
> Pratt & Whitney/Unitetd Technologies
> M/S: 714-03
> P.O. Box 109600
> West Palm Beach, FL. 33410-9600

> Phone: (561) 796-5967
> Fax: (561) 796-8993

> > From: Geno Vallejos[SMTP:gvalle@c...]
> > Sent: Friday, January 15, 1999 12:01 PM
> > To: xansys@o...
> > Subject: [xansys] Multiple CPU's in SUN environment

> > From: Geno Vallejos

> > To all my fellow ANSYS users:

> > I have had some interesting results when solving the same structural
> > problem using the same model but on two different SUN machines.
> > Below are the specifics;

> > The structural model is a part created in ProENGINEER 18
> > I am using ANSYS ProFEA 5.4 and ProENGINEER 18.

> > Solution #1:
> > Machine: SUN E-3000 server
> > Processors: 4 each 360 MHz CPU's
> > Operating System: Solaris 2.6
> > CP Time (from the file.lst summary) = 10 minutes 28 seconds

> > The first time I requested four CPU's using the config.ans file, with
> the
> > following line added;
> > NUM_PROC = 4
> > The config.ans file was located in the /docu directory.
> > The file.lst indicated that 4 CPU's will be used

> > The second time I requested four CPU's using a .inp file. The .inp
> file
> > had
> > the following line;
> > /config,nproc,4

> > The solution times (CP Time listed above) was 10 minutes 28 seconds

> > Solution #2:
> > Machine: SUN Ultra 60 workstation
> > Processors: 1 each 360 MHz CPU
> > Operating System: Solaris 2.6
> > CP Time (from the file.lst summary) = 10 minutes 53 seconds

> > Can anyone help explain why the E-3000 server and the Ultra 60
> > workstation solved the structural analysis problem by taking the same
> > amount of time????

> > I have heard some ideas....but nothing concrete. Some here at ATL say
> > that the four SUN processors will work as hard as they need to to solve
> > the problem. I say that I would like them to solve the problem as fast
> as
> > possible. Observing the CPU activity bar during the solution phase
> > indicated that at no time were any of the four CPU's working any higher
> > than 40-50% of maximum capacity. Was this due to some SUN or Solaris
> > setting "chocking" the CPU speed or efficiency; or some ANSYS setting
> > not getting the full support of multi-tasking from the SUN server??

> > Thanks in advance!

> > Geno Vallejos
> > ATL Ultrasound - A Philips Company
> > Bothell, Washington 98021
> > www.atl.com

Posts possibly associated with message #267AuthorDateScore
263ANSYS and parallel processing...Viktor Doundakov1999/01/15 
265Re: ANSYS and parallel processing...John Swanson1999/01/15 
267Re: ANSYS and parallel processing...Brian Breaux1999/01/15 
268Re: ANSYS and parallel processing...Brian Murphy1999/01/15 
271Re: ANSYS and parallel processing...Joe Metrisin1999/01/15 
273Re: ANSYS and parallel processing...Viktor Doundakov1999/01/15 
275Re: ANSYS and parallel processing...Brian Breaux1999/01/15 
278Re: ANSYS and parallel processing...John Swanson1999/01/15 
286Re: ANSYS and parallel processing...Terje Fredriksen1999/01/18