Fortran Coarray and MPI Examples

A few very basic examples, perhaps use to test Coarray and MPI library functionality. GCC/Gfortran, Intel oneAPI, NAG, Cray, IBM XL and other compilers support Fortran 2008 Coarrays.

Free, popular MPI 3.0 interfaces for C and Fortran include:

• OpenMPI (Linux, Mac)
• MPICH (Linux, Mac)
• Intel MPI (Linux, Windows)

Build:

cmake -B build
cmake --build build

Run self-tests:

ctest --test-dir build

Message Passing

Pass data between two MPI threads. In this usage, MPI_Recv blocks waiting for MPI_Send

mpirun -np 2 mpi/mpi_pass

Notes

See OpenMPI docs re: setting PATH and LD_LIBRARY_PATH if CMake has trouble finding OpenMPI for a compiler.

• https://hpc-forge.cineca.it/files/CoursesDev/public/2017/MasterCS/CalcoloParallelo/MPI_Master2017.pdf