OpenMPI is not currently available for native Windows. While Cygwin and WSL do have working OpenMPI, it is also possible to use MPICH via Microsoft MS-MPI as described in this article.
setup MPI on Windows MSYS2
This procedure gives MPI via MSYS2 GCC / Gfortran compilers on Windows.
Download and install Microsoft MS-MPI
mpiexec.exeavailable, add to user PATH:
C:\Program Files\Microsoft MPI\Bin– this is needed even when using MSYS2.
Install MSYS2 MS-MPI library, from the MSYS2 Terminal
pacman -S mingw-w64-x86_64-msmpi
compile, creating “mpi.mod” for Fortran use. Do NOT link with
aror MPI may only run with a single image.
cd C:/msys64/mingw64/ gfortran include/mpi.f90 -c -fno-range-check -fallow-invalid-boz
If you don’t compile the mpi.f90 as above, errors may result like:
use mpi Fatal Error: Cannot open module file 'mpi.mod' for reading at (1): No such file or directory
MS-MPI without MSYS2
If not using MSYS2, it’s still possible to use MS-MPI. We will put the resulting artifacts under c:/lib/mpi
mkdir c:/lib/mpi/ Copy-Item -Path "C:/Program Files (x86)/Microsoft SDKs/MPI/Include" -Destination "c:/lib/mpi/" -Recurse cd c:/lib/mpi
you may need to edit “include/mpi.f90” to have
gfortran include/mpi.f90 -c -fno-range-check -fallow-invalid-boz
Do NOT link with
ar or MPI may only run with a single image.
IntelMPI clash with MinGW MS-MPI
Upon installing or updating the Intel Parallel Studio on Windows, you may experience CMake failing to find MPI for MinGW. This happens because Intel compilers put Intel MPI on the system PATH. Generally we remove Intel MPI from the system PATH and use the Intel Compiler shell instead, which provides all the needed directories. This is because we don’t typically use Intel MPI with Visual Studio, and if we did, we’d make a shell script for that.