ring_mpi, a C++ code 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.
The latest versions of MPI no longer support the special C++ MPI bindings, so the examples given here have reverted to using the C MPI bindings.
The computer code and data files described and made available on this web page are distributed under the MIT license
ring_mpi is available in a C version and a C++ version and a FORTRAN90 version.
COMMUNICATOR_MPI, a C++ code which creates new communicators involving a subset of initial set of MPI processes in the default communicator MPI_COMM_WORLD.
HEAT_MPI, a C++ code which solves the 1D Time Dependent Heat Equation using MPI.
HELLO_MPI, a C++ code which prints out "Hello, world!" using MPI for parallel execution.
mpi_test, C++ codes which illustrate the use of the Message Passing Interface (MPI) for parallel computations in a distributed memory environment.
MULTITASK_MPI, a C++ code which demonstrates how to "multitask", that is, to execute several unrelated and distinct tasks simultaneously, using MPI for parallel execution.
PRIME_MPI, a C++ code which counts the number of primes between 1 and N, using MPI for parallel execution.
QUAD_MPI, a C++ code which approximates an integral using a quadrature rule, and carries out the computation in parallel using MPI.
RANDOM_MPI, a C++ code which demonstrates one way to generate the same sequence of random numbers for both sequential execution and parallel execution under MPI.
SATISFY_MPI, a C++ code 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 C++ code which searches integers between A and B for a value J such that F(J) = C, using MPI for parallel execution.
WAVE_MPI, a C++ code which uses finite differences and MPI to estimate a solution to the wave equation.