UW AMath High Performance Scientific Computing
AMath 483/583 Class Notes
Spring Quarter, 2011

Table Of Contents

Previous topic


Next topic

MPI with subroutine calls

This Page


MPI is discussed in Slides from lectures starting with Lecture 18.

MPI stands for Message Passing Interface and is a standard approach for programming distributed memory machines such as clusters, supercomputers, or heterogeneous networks of computers. It can also be used on a single shared memory computer, although it is often more cumbersome to program in MPI than in OpenMP.

MPI implementations

A number of different implementations are available (open source and vendor supplied for specific machines). See this list, for example.

MPI on the class VM

The VM has open-mpi installed.

The libraries necessary to compile MPI programs are already installed on the class VM.

You should be able to do the following:

$ cd $CLASSHG/codes/mpi
$ mpif90 test1.f90
$ mpiexec -n 4 a.out

and see output like:

Hello from Process number           1  of            4  processes
Hello from Process number           3  of            4  processes
Hello from Process number           0  of            4  processes
Hello from Process number           2  of            4  processes

For hints on installation on a Mac, see Installing MPI on a Mac.

Sample codes

There are a few sample codes in the $CLASSHG/codes/mpi directory.

See Jacobi iteration using MPI.

See also the samples in the list below.