MPI Demos

This directory contains simple examples demonstrating MPI (Message Passing Interface) using Python’s mpi4py library. Each file includes a docstring showing the command needed to run the demo.

A presentation explaining the concepts behind these examples is available in MPI_presentation.pdf.

Setup

Suggested setup with Python virtual environment (ensure python is installed):

python -m venv mpi-env
source mpi-env/bin/activate  # On Windows: mpi-env\Scripts\activate
pip install mpi4py

Running

Each demo includes its own docstring with the exact command to run it. In general, you can execute any demo using:

mpiexec -n <num_processes> python <demo_file>.py

Example:

mpiexec -n 4 python 1_grade_sendrecv.py

Demo Overview

• Point-to-Point Communication: 1_grade_sendrecv.py

• Collective Communication: 2_grade_scatter_gather_bcast.py, 3_grade_scatter_allreduce.py

• Deadlock Examples: 4_deadlock_sendrecv.py, 5_deadlock_fixed_order.py, 6_deadlock_fixed_sendrecv.py

Ensure that an MPI implementation (e.g. OpenMPI or MPICH) is installed on your system.

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Authors: Bryce Shirley and Maciej Kaczorek