Install MPI on a MacBook

--D. Thiebaut (talk) 12:43, 7 October 2013 (EDT)
updated --D. Thiebaut (talk) 16:50, 4 March 2017 (EST)

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Download

• from https://www.open-mpi.org/software/ompi/v2.0/
• get the tar file openmpi-2.0.2.tar.bz2 (or whichever latest version is the current one).

Extract and Install

• Assume that the downloaded file is in your ~/Downloads directory
• Just follow the directions in the INSTALL file, which are summarized below. The installation was done on *my* machine, and assumes the user is thiebaut. Change and plug-in your own user name.
• open a Terminal window, and type the following commands in it:

cd
mkdir mpi
mkdir mpi/download
cd mpi/download
mv ../Downloads/openmpi-2.0.2.tar.bz2  .
tar -xzvf openmpi-2.0.2.tar.bz2
cd openmpi-2.0.2
./configure --prefix=/Users/thiebaut/mpi/    (replace thiebaut by your user name on your Mac)
 

• The last command will take 10 minutes or so. When it is done, make all and install

make all install

• This last command takes a while as well...

Update your path

• edit the .bash_profile file in your main account directory.
• locate the line that reads PATH=...
• right below this line, add the new line

     PATH=$PATH:/Users/thiebaut/mpi/bin/       

• and make sure your replace thiebaut by your account name!
• source your .bash_profile so that the new path is learnt by your system

 cd
 source .bash_profile

• You are done!

Testing

Create this file in the directory of your choice, and call it helloWorld.c:

/* C Example */
#include <stdio.h>
#include <mpi.h>


int main (argc, argv)
     int argc;
     char *argv[];
{
  int rank, size;

  MPI_Init (&argc, &argv);	/* starts MPI */
  MPI_Comm_rank (MPI_COMM_WORLD, &rank);	/* get current process id */
  MPI_Comm_size (MPI_COMM_WORLD, &size);	/* get number of processes */
  printf( "Hello world from process %d of %d\n", rank, size );
  MPI_Finalize();
  return 0;
}

Compile and Run

mpicc -o hello helloWorld.c
mpirun -np 2 ./hello
Hello world from process 0 of 2
Hello world from process 1 of 2

• If you see the two lines starting with "Hello world" on your screen, MPI was successfully installed on your system!