Message Passing Interface (MPI)

Overview

Message Passing Interface (MPI) is a standardized and portable message-passing standard designed by a group of researchers from academia and industry to function on a wide variety of parallel computing architectures.

Installation

Debian based Operating Systems

This has been tested on Raspbian.

$ sudo apt-get install openmpi-common openmpi-bin libopenmpi-dev

Compiling and Running

To compile (from command line / Bash), on most installations, you generally would use:

 mpicc -o exename myfile.c    # this would combile file myfile and the generated executable would be called exename

To start multiple instances of the program (as in the default number of nodes, which would be the number of cores your computer has) and to start running the program you would do:

mpirun ./exename    # this is to execute the generated exename executable in the current directory

To start a particular number of instances, in this case 4 nodes, and to start running them you would use:

mpirun -n 4 ./exename   # start exename with 4 nodes

Tutorial

See this link for usage notes.