[petsc-users] Configuring petsc with MPI on ubuntu quad-core

[Matthew Knepley]

On Wed, Feb 2, 2011 at 4:46 PM, Vijay S. Mahadevan <vijay.m at gmail.com>wrote:

> Hi,
>
> I am trying to configure my petsc install with an MPI installation to
> make use of a dual quad-core desktop system running Ubuntu. But
> eventhough the configure/make process went through without problems,
> the scalability of the programs don't seem to reflect what I expected.
> My configure options are
>
> --download-f-blas-lapack=1 --with-mpi-dir=/usr/lib/ --download-mpich=1
> --with-mpi-shared=0 --with-shared=0 --COPTFLAGS=-g
> --download-parmetis=1 --download-superlu_dist=1 --download-hypre=1
> --download-blacs=1 --download-scalapack=1 --with-clanguage=C++
> --download-plapack=1 --download-mumps=1 --download-umfpack=yes
> --with-debugging=1 --with-errorchecking=yes
>

1) For performance studies, make a build using --with-debugging=0

2) Look at -log_summary for a breakdown of performance

   Matt


> Is there something else that needs to be done as part of the configure
> process to enable a decent scaling ? I am only comparing programs with
> mpiexec (-n 1) and (-n 2) but they seem to be taking approximately the
> same time as noted from -log_summary. If it helps, I've been testing
> with snes/examples/tutorials/ex20.c for all purposes with a custom
> -grid parameter from command-line to control the number of unknowns.
>
> If there is something you've witnessed before in this configuration or
> if you need anything else to analyze the problem, do let me know.
>
> Thanks,
> Vijay
>



-- 
What most experimenters take for granted before they begin their experiments
is infinitely more interesting than any results to which their experiments
lead.
-- Norbert Wiener
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