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MPI wrappers for Julia

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The admin has installed the JULIA with the Modules on the system directory of the Cray XC50. ``` $ /opt/prg/.src/julia/julia-1.7.3-full.gnu> cat Make.user prefix=/opt/prg/julia/1.7.3/GNU/73 $ /opt/prg/.src/julia/julia-1.7.3-full.gnu> cat conf.gnu module swap PrgEnv-cray...

Cray MPI

@luraess and I have been testing MPI.jl on OLCF's Crusher which uses cray-mpich. Runs execute as independent MPI processes, we think the issue is that MPIPreferences can't recognize the cray-mpich...

I'm porting my `Fortran - MPI` codes to `Julia`, and the first thing that comes to my mind is _how do I write `MPI` aware tests for my package(s) ?_...

Dear MPI.jl team, I have not found any wrapper for `MPI_Intercomm_create` nor in the documentation nor by grep-ing into de source code. Is there a specific reason that prevents to...

Handle `MPI.Consts.MPI_PROC_NULL[]` in a similar fashion to `MPI_COMM_TYPE_SHARED` (related / by analogy to #584). In short, avoid exposing the `MPI.Const.XYZ[]` to the user. _Note: feel free to edit this issue...

This is an attempt to fix #574 and to resolve #575. Input welcome.

MPIPreferences

Fixes #404. needs tests. @vchuravy would this work on PPC? We should set up a CI build now that Travis supports PPC.

Right now there is only a [(very) short section](https://juliaparallel.org/MPI.jl/dev/configuration/#Migration-from-MPI.jl-version-0.19-or-earlier) on transitioning from v0.19 to v0.20 in the docs. It would be great if this could be expanded a little from...

The MPI standard has a function `MPI_Comm_set_errhandler` that we (since Julia has overloading) would usually call `MPI.set_errhandler!`. However, we deviate from "the usual" rules for translating MPI function names, and...