Compiling MPI Programs

OpenMPI and Intel MPI (IMPI) are implementations of the Message-Passing Interface (MPI) standard. Libraries for these MPI implementations and compilers for C, C++, and Fortran are available on all clusters.

MPI programs require including a header file:

Language	Header Files
Fortran 77	INCLUDE 'mpif.h'
Fortran 90	INCLUDE 'mpif.h'
Fortran 95	INCLUDE 'mpif.h'
C	#include <mpi.h>
C++	#include <mpi.h>

Here are a few sample programs using MPI:

• mpi_hello.f
• mpi_hello.f90
• mpi_hello.f95
• mpi_hello.c
• mpi_hello.cpp

To see the available MPI libraries:

$ module avail openmpi 
$ module avail impi

The following table illustrates how to compile your MPI program. Any compiler flags accepted by Intel ifort/icc compilers are compatible with their respective MPI compiler:

Language	Intel MPI	OpenMPI
Fortran 77	$ mpiifort program.f -o program	$ mpif77 program.f -o program
Fortran 90	$ mpiifort program.f90 -o program	$ mpif90 program.f90 -o program
Fortran 95	$ mpiifort program.f95 -o program	$ mpif90 program.f95 -o program
C	$ mpiicc program.c -o program	$ mpicc program.c -o program
C++	$ mpiicpx program.cpp -o program	$ mpiCC program.cpp -o program

The Intel and GNU compilers will not output anything for a successful compilation. Also, the Intel compiler does not recognize the suffix .f95.

Here is some more documentation from other sources on the MPI libraries:

• Message Passing Interface Forum
• Open MPI Home
• Open MPI Documentation

Back to the Compiling Programs section