[Trilinos-Users] Tpetra+Anasazi performance

Erik Boman egboman at sandia.gov
Wed May 14 11:57:21 MDT 2014


MPI should give better scaling than this :)
Others might be better positioned to comment on the performance of 


David Hysom wrote:
> Hi,
> Please see the attached for an example of what we're seeing for
> strong scaling for LOBPCG+Tpetra, in a shared memory environment.
> Bottom line is, this example shows a speedup of 3.0
> We've run many problems with varying parameters/matrices, and typically
> only see speedups between 2.0 and 3.0
> Is this expected? Is there anything wrt upcoming trilinos development
> that might increase scalability?
> Stats are for trilinos-11.6.1
> A second question: we've tested with OpenMP, Pthreads, and TBB.
> We always find that OpenMP gives the best results (shortest execution
> time), although Pthreads and TBB are reasonably close. Do you know
> of circumstances (not limited to Anasazi) where Pthreads or TBB
> outperform OpenMP?
> thanks, David
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