Compiling Hybrid Programs

A hybrid program combines both MPI and shared-memory to take advantage of compute clusters with multi-core compute nodes. Libraries for OpenMPI and Intel MPI (IMPI) and compilers which include OpenMP for C, C++, and Fortran are available.

Hybrid programs require including header files:
Language Header Files
Fortran 77
INCLUDE 'omp_lib.h'
INCLUDE 'mpif.h'
Fortran 90
use omp_lib
INCLUDE 'mpif.h'
Fortran 95
use omp_lib
INCLUDE 'mpif.h'
C
#include <mpi.h>
#include <omp.h>
C++
#include <mpi.h>
#include <omp.h>

A few examples illustrate hybrid programs with task parallelism of OpenMP:

This example illustrates a hybrid program with loop-level (data) parallelism of OpenMP:

To see the available MPI libraries:

$ module avail impi
$ module avail openmpi

The following tables illustrate how to compile your hybrid (MPI/OpenMP) program. Any compiler flags accepted by Intel ifort/icc compilers are compatible with their respective MPI compiler.

Intel MPI
Language Command
Fortran 77
$ mpiifort -openmp myprogram.f -o myprogram
Fortran 90
$ mpiifort -openmp myprogram.f90 -o myprogram
Fortran 95
$ mpiifort -openmp myprogram.f90 -o myprogram
C
$ mpiicc -openmp myprogram.c -o myprogram
C++
$ mpiicpc -openmp myprogram.C -o myprogram
OpenMPI or Intel MPI (IMPI) with Intel Compiler
Language Command
Fortran 77
$ mpif77 -openmp myprogram.f -o myprogram
Fortran 90
$ mpif90 -openmp myprogram.f90 -o myprogram
Fortran 95
$ mpif90 -openmp myprogram.f90 -o myprogram
C
$ mpicc -openmp myprogram.c -o myprogram
C++
$ mpiCC -openmp myprogram.C -o myprogram
OpenMPI or Intel MPI (IMPI) with GNU Compiler
Language Command
Fortran 77
$ mpif77 -fopenmp myprogram.f -o myprogram
Fortran 90
$ mpif90 -fopenmp myprogram.f90 -o myprogram
Fortran 95
$ mpif90 -fopenmp myprogram.f95 -o myprogram
C
$ mpicc -fopenmp myprogram.c -o myprogram
C++
$ mpiCC -fopenmp myprogram.C -o myprogram

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

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