HELLO_MPI
Hello World, Using MPI

HELLO_MPI is a FORTRAN77 program which prints out "Hello, World!", while invoking the MPI parallel programming system.

If you're just trying to learn MPI, or learning how to use MPI on a different computer system, or in batch mode, it's helpful if you start with a very simple program with a tiny amount of output that should print immediately if things are working well.

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Languages:

HELLO_MPI is available in a C version and a C++ version and a FORTRAN77 version and a FORTRAN90 version and a Python version.

Related Data and Programs:

COMMUNICATOR_MPI, a FORTRAN77 program which creates new communicators involving a subset of initial set of MPI processes in the default communicator MPI_COMM_WORLD.

HEAT_MPI, a FORTRAN77 program which solves the 1D Time Dependent Heat Equation using MPI.

HELLO, a FORTRAN77 program which prints out "Hello, world!".

HELLO_OPENMP, a FORTRAN77 program which prints out "Hello, world!" using the OpenMP parallel programming environment.

MOAB, examples which illustrate the use of the MOAB job scheduler for a computer cluster.

MPI, FORTRAN77 programs which illustrate the use of the MPI application program interface for carrying out parallel computatioins in a distributed memory environment.

MPI_STUBS, a FORTRAN77 library which contains "stub" MPI routines, allowing a user to compile, load, and possibly run an MPI program on a serial machine.

MULTITASK_MPI, a FORTRAN77 program which demonstrates how to "multitask", that is, to execute several unrelated and distinct tasks simultaneously, using MPI for parallel execution.

PRIME_MPI, a FORTRAN77 program which counts the number of primes between 1 and N, using MPI for parallel execution.

QUAD_MPI, a FORTRAN77 program which approximates an integral using a quadrature rule, and carries out the computation in parallel using MPI.

RANDOM_MPI, a FORTRAN77 program which demonstrates one way to generate the same sequence of random numbers for both sequential execution and parallel execution under MPI.

RING_MPI, a FORTRAN77 program which uses the MPI parallel programming environment, and measures the time necessary to copy a set of data around a ring of processes.

SATISFY_MPI, a FORTRAN77 program which demonstrates, for a particular circuit, an exhaustive search for solutions of the circuit satisfiability problem, using MPI to carry out the calculation in parallel.

SEARCH_MPI, a FORTRAN77 program which searches integers between A and B for a value J such that F(J) = C, using MPI for parallel execution.

WAVE_MPI, a FORTRAN77 program which uses finite differences and MPI to estimate a solution to the wave equation.

Reference:

1. Michael Quinn,
   Parallel Programming in C with MPI and OpenMP,
   McGraw-Hill, 2004,
   ISBN13: 978-0071232654,
   LC: QA76.73.C15.Q55.

Source Code:

• hello_mpi.f, the source code.

Examples and Tests:

HELLO_FSU compiles and runs the program on the FSU HPC cluster.

• hello_fsu.sh, the MOAB script.
• hello_fsu_output.txt, the output file.

HELLO_LOCAL compiles and runs the program on the local system, which might work if OpenMPI is installed, and which might make sense if your system has multiple cores.

• hello_local.sh, the script.
• hello_local_output.txt, the output file. (No output because my system doesn't support MPIF77)

HELLO_SYSX compiles and runs the program on Virginia Tech's System X cluster.

• hello_sysx.sh, the MOAB script.
• hello_sysx_output.txt, the output file.

You can go up one level to the FORTRAN77 source codes.