Purdue University

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.

INCLUDE 'omp_lib.h'
INCLUDE 'mpif.h'

use omp_lib
INCLUDE 'mpif.h'

use omp_lib
INCLUDE 'mpif.h'

#include <mpi.h>
#include <omp.h>

#include <mpi.h>
#include <omp.h>

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

• hybrid_hello.f
• hybrid_hello.f90
• hybrid_hello.f95
• hybrid_hello.c
• hybrid_hello.cpp

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

• hybrid_loop.c

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.

$ mpiifort -qopenmp myprogram.f -o myprogram

$ mpiifort -openmp myprogram.f90 -o myprogram

$ mpiifort -openmp myprogram.f90 -o myprogram

$ mpiicc -qopenmp myprogram.c -o myprogram

$ mpiicpc -qopenmp myprogram.cpp -o myprogram

$ mpif77 -fopenmp myprogram.f -o myprogram

$ mpif90 -fopenmp myprogram.f90 -o myprogram

$ mpif90 -fopenmp myprogram.f95 -o myprogram

$ mpicc -fopenmp myprogram.c -o myprogram

$ mpiCC -fopenmp myprogram.cpp -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.