[petsc-dev] Consider changing default installation instructions so that OS X users don't mix their MPI metaphors

[Aron Ahmadia]

OS X and many Linux distributions now come with a system MPI.  If you
install by downloading MPICH and then use 'mpirun', your code will never run
in parallel, at best, or do something completely unexpected, at worst.

The current default instructions are:

export PETSC_DIR=$PWD
./config/configure.py --with-cc=gcc --with-fc=gfortran
--download-f-blas-lapack=1 --download-mpich=1
make all test

I think OS X-specific instructions that don't install MPICH or that
explicitly suggest appending $PETSC_DIR/$PETSC_ARCH/bin to your path when
running parallel jobs after installing mpich will help prevent users from
falling into this trap.

A
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-dev/attachments/20110605/ba62f261/attachment.html>