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Using MPI
6.5. Using MPICH on Linux and OS X
PGI Workstation for Linux and OS X and PGI CDK for Linux include MPICH header files,
libraries and tools required to compile, execute, profile, and debug MPI programs. PGI
Workstation can be installed on a single system, and that system can be treated as if it is a small
cluster by using this version of MPI.
Example
MPI Hello World Example
The following MPI example program uses MPICH.
$
$
$
$
$
cd my_example_dir
cp -r $PGI/linux86-64/14.0/EXAMPLES/MPI/mpihello .
cd mpihello
export PATH=$PGI/linux86-64/2015/mpi/mpich/bin:$PATH
pgfortran -Mmpi=mpich mpihello.f -o mpihello
$ mpiexec mpihello
Hello world! I'm node 0
$ mpiexec -np 4 mpihello
Hello world! I'm node 0
Hello world! I'm node 2
Hello world! I'm node 1
Hello world! I'm node 3
If you want to build your MPI application using the instance of MPICH installed with the PGI
compilers, just use the -Mmpi=mpich option. Add -g for debugging, or use -Mprof=mpich
instead to instrument for MPICH profiling.
To use a different instance of MPICH instead of the PGI-provided one, use the MPIDIR
environment variable. Before compiling set MPIDIR to the root of the MPICH installation
directory that you want to use, that is, the directory that contains bin, include, lib, and so on. You
can still use the -Mmpi=mpich and -Mprof=mpich options but now the compilers use the
MPIDIR-specified version of MPICH instead of the PGI default.
6.6. Using MPICH1, MPICH2, and MVAPICH1 on Linux
The -Mmpi and –Mprof sub-options mpich1, mpich2 and mvapich1 have been deprecated in
the PGI 2015 release and will be disabled in a future release. To use these deprecated options,
you must first set the environment variable MPIDIR to the root of the MPI installation directory
you intend to use, that is, the directory that contains bin, include, lib and so on. If you do not set
MPIDIR, you will see an error like the following:
$ pgfortran -Mmpi=mpich2 pi.f90 -o fpi
-Mmpi=mpich2 has been deprecated and will be removed in a future release
pgfortran-Error-The environment variable $MPIDIR must be set to use MPICH2
Once MPIDIR is set, you can use –Mmpi and –Mprof with the mpich1, mpich2 and mvapich1
sub-options as you have in previous releases.
PGI Compiler User's Guide
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