1 Tutorial

The following program prints a message from each process:

local mpi = require("mpi")

local comm = mpi.comm_world
local rank = comm:rank()
local size = comm:size()

print("Hello, world, from rank "..rank.." of "..size.."!")

2 Diffusion equation

This example requires the HDF5 library with MPI support and HDF5 for Lua.

The program diffusion_1d.lua solves the 1-dimensional diffusion equation by finite differences.

Execute the program with the desired number of processes:

mpirun -np 8 ./diffusion_1d.lua diffusion_1d.h5

Plot the time evolution of the 1-dimensional diffusion equation:

./diffusion_1d.py diffusion_1d.pdf diffusion_1d.h5

3 References

• MPI Documents
• Open MPI Documentation