RING_MPI
Estimating Communication Rates in MPI


RING_MPI is a FORTRAN90 program which estimates the time it takes to send a vector of N double precision values through each process in a ring.

Process 0 sends N double precision values to process 1, which passes them to process 2, and so on, until process P-1 sends them back to process 0. The time for this transmission is recorded. The experiment is repeated several times, and for several different array sizes N.

Licensing:

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

Languages:

RING_MPI is available in a C version and a C++ version and a FORTRAN77 version and a FORTRAN90 version.

Related Data and Programs:

COMMUNICATOR_MPI, a FORTRAN90 program which creates new communicators involving a subset of initial set of MPI processes in the default communicator MPI_COMM_WORLD.

HEAT_MPI, a FORTRAN90 program which solves the 1D Time Dependent Heat Equation using MPI.

HELLO_MPI, a FORTRAN90 program which prints out "Hello, world!" using MPI for parallel execution.

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

MPI, FORTRAN90 programs which illustrate the use of the MPI application program interface for carrying out parallel computatioins in a distributed memory environment.

MPI_STUBS, a FORTRAN90 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 FORTRAN90 program which demonstrates how to "multitask", that is, to execute several unrelated and distinct tasks simultaneously, using MPI for parallel execution.

PRIME_MPI, a FORTRAN90 program which counts the number of primes between 1 and N, using MPI for parallel execution.

QUAD_MPI, a FORTRAN90 program which approximates an integral using a quadrature rule, and carries out the computation in parallel using MPI.

RANDOM_MPI, a FORTRAN90 program which demonstrates one way to generate the same sequence of random numbers for both sequential execution and parallel execution under MPI.

SATISFY_MPI, a FORTRAN90 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 FORTRAN90 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 FORTRAN90 program which uses finite differences and MPI to estimate a solution to the wave equation.

Reference:

  1. Peter Pacheco,
    Parallel Programming with MPI,
    Morgan Kaufman, 1996,
    ISBN: 1558603395,
    LC: QA76.642.P3.

Source Code:

Examples and Tests:

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

RING_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.

You can go up one level to the FORTRAN90 source codes.


Last revised on 19 October 2012.