XANSYS Message: 247 [Go back to message list]
[bookmark on del.icio.us]
No rating yet
Rate item:

Subject: Multiple CPUs in SUN environment
Author: Geno Vallejos gvalle@
Date: 1999-01-15 12:01:00

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 #247AuthorDateScore
247Multiple CPUs in SUN environmentGeno Vallejos gvalle@1999/01/15 
248Re: Multiple CPUs in SUN environmentBrian Breaux1999/01/15 
250Re: Multiple CPUs in SUN environmentJoe Metrisin1999/01/15 
260Re: Multiple CPUs in SUN environmentBrian Murphy1999/01/15 
266Re: Multiple CPUs in SUN environmentJohn Swanson1999/01/15 
269Re: Multiple CPUs in SUN environmentPatrick Tibbits1999/01/15 
270Re: Multiple CPUs in SUN environmentHeinz.Hempowitz@1999/01/15 
281Re: Multiple CPUs in SUN environmentDan Bohlen1999/01/16 
283Re: Multiple CPUs in SUN environmentJohn Swanson1999/01/16 
323Summary of Multiple CPUs in SUN environment questionGeno Vallejos gvalle@1999/01/19 
324Re: Summary of Multiple CPUs in SUN environment queChristopher Wright1970/01/01 
332Re: Summary of Multiple CPUs in SUN environment questionJoe Rasche1999/01/20 
340Re: Summary of Multiple CPUs in SUN environment questionBrian Murphy1999/01/20