[petsc-users] Question about PETSc installs and MPI

[Matthew Knepley]

On Fri, Jul 18, 2014 at 8:16 PM, John Yawney <jyawney123 at gmail.com> wrote:

> Hello,
>
> I had a question about PETSc installations. On my local computer I
> configured PETSc (v 3.4.2) using the options:
>
> ./configure --with-cc=mpicc --with-cxx=mpic++ --download-f-blas-lapack
> --download-mpich --download-hypre
>
> I wrote a test program that defines a vector using DMDAs, computes a dot
> product, exchanges halo elements, and computes a low-order FD derivative of
> the vector. Under my installation of PETSc everything works fine. For
> some reason, when my colleagues run the program, they get segmentation
> fault errors. If they change the y and z boundary types to GHOSTED as well,
> they get the program to run until the end (seg faults at the end though)
> but they get a local value of the dot product. I've attached the main.cpp
> file for this script.
>
> When they installed their versions of PETSc they didn't use the
> --download-mpich option but instead used either:
> ./configure --download-f-blas-lapack --with-scalar-type=complex
> or with the
> option: --with-mpi-dir=/home/kim/anaconda/pkgs/mpich2-1.3-py27_0
>
> Could this be causing a problem with the parallelization under PETSc?
>

I have run your code on my machine up to P=8 and used valgrind. No problems
turned up other
than the fact that you need a "return 0" is missing from main().

If there are still problems, please have them send a stack trace.

  Thanks,

     Matt


> Thanks for the help and sorry for the long question.
>
> Best regards,
> John
>



-- 
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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