[Trilinos-Users] Using OpenMP support in Trilinos

[Heroux, Michael A]

Eric,

Can you give some details about problem size, use of MPI (or not), type of system, etc.

Thanks.

Mike

On Sep 19, 2012, at 3:17 PM, Eric Marttila wrote:

> Hello,
> 
> I'm using AztecOO and ML to solve a linear system.  I've been running my 
> simulation in serial mode, but now I would like to take advantage of multiple 
> cores by using the OpenMP support that is available in Trilinos.  I realize 
> that the packages I'm using are not fully multi-threaded with openmp, but I'm 
> hoping for some performance improvement since some of the packages I'm using 
> have at least some level of OpenMP support.
> 
> I reconfigured and built Trilinos 10.12.2 with 
> 
> -D Trilinos_ENABLE_OpenMP:BOOL=ON
> 
> ...but when I run my simulation I see that it is slower than if I have 
> Trilinos configured without the above option.  I have set the environment 
> variable OMP_NUM_THREADS to the desired number of threads.
> 
> I was also able to reproduce this behavior with one of the trilinos example 
> prgrams (attached below), so I suspect I am missing something obvious in using 
> the OpenMP support.
> 
> Does anybody have thoughts of what I might be missing?
> 
> Thanks.
> --Eric
> 
> -- 
> Eric A. Marttila
> ThermoAnalytics, Inc.
> 23440 Airpark Blvd.
> Calumet, MI 49913
> 
> email: Eric.Marttila at ThermoAnalytics.com
> phone: 810-636-2443
> fax:   906-482-9755
> web: http://www.thermoanalytics.com
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