Mpirun example

Author: Wes Kendall

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In this lesson, I will show you a basic MPI hello world application and also discuss how to run an MPI program. The lesson will cover the basics of initializing MPI and running an MPI job across several processes.

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This lesson is intended to work with installations of MPICH2 (specifically 1.4). If you have not installed MPICH2, please refer back to the installing MPICH2 lesson.

Note - All of the code for this site is on GitHub.

This tutorial’s code is under tutorials/mpi-hello-world/code.

Hello world code examples

Let’s dive right into the code from this lesson located in mpi_hello_world.c. Below are some excerpts from the code.

You will notice that the first step to building an MPI program is including the MPI header files with .

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After this, the MPI environment must be initialized with:

During , all of MPI’s global and internal variables are constructed. For example, a communicator is formed around all of the processes that were spawned, and unique ranks are assigned to each process.

Currently, takes two arguments that are not neces

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