Yes on all points regarding MPI and BLAS/Lapack. I recommend installing a current MPICH and/or Open MPI system-wide, preferably hooked up to ccache (see replies to this thread: https://lists.mcs.anl.gov/pipermail/petsc-dev/2020-January/025505.html <https://lists.mcs.anl.gov/pipermail/petsc-dev/2020-January/025505.html>), as well as BLAS/Lapack system-wide. It's the other packages that are more likely to depend on int/scalar configuration, but even many of those (HDF5, SuiteSparse, etc.) aren't built specially for PETSc.

Is the home-brew MPICH, openblas, lapack sufficient here? Or is it recommended to build all three from source? Best regards, Jacob Faibussowitsch (Jacob Fai - booss - oh - vitch) Cell: (312) 694-3391

On Mar 22, 2020, at 4:25 PM, Jed Brown <[email protected]> wrote:

Jacob Faibussowitsch <[email protected] <mailto:[email protected]>> writes:

...

Hello all,

As part of development, I have several arch folders lying around in my PETSC_DIR namely a 32-bit OSX, 64-bit OSX, 32-bit linux with valgrind, 64-bit linux with valgrind, and a 32-bit up to date with current master. All of these have a —download-mpich —download-fblaslapack and hence their own copy of each (so that’s 5 copies of each, plus other duplicated packages im sure). At this stage, even getting the bare minimum of these arches ready for dev work after a rebase/git pull takes decades as package versions, or conf settings change, forcing a rebuild of the same packages multiple times.

My question(s): What petsc ./configure options are necessary to change the configuration of each library w.r.t. petsc? i.e. can my 64-bit arches use my 32-bit MPICH/fblaslapack and vice-versa?

Yes on all points regarding MPI and BLAS/Lapack. I recommend installing a current MPICH and/or Open MPI system-wide, preferably hooked up to ccache (see replies to this thread: https://lists.mcs.anl.gov/pipermail/petsc-dev/2020-January/025505.html <https://lists.mcs.anl.gov/pipermail/petsc-dev/2020-January/025505.html>), as well as BLAS/Lapack system-wide. It's the other packages that are more likely to depend on int/scalar configuration, but even many of those (HDF5, SuiteSparse, etc.) aren't built specially for PETSc.

...

Does this change when I have —with-debug on or off? If so, what other packages have a similar ability? Is there anywhere in ./configure —help where this kind of information would be documented?

I suspect that this hasn’t been fully explored since its primarily a developer “problem” and not one the average user will run into/care about (since they usually aren’t building petsc multiple times). I’m sure everyone has their own ways of tackling this problem, I’d love to hear them.

Best regards,

Jacob Faibussowitsch (Jacob Fai - booss - oh - vitch) Cell: (312) 694-3391