Gilles, I'll keep it in mind, install 64bits ARM Rapsbian version next time I reinstall OS. But for now, I have too many things installed and configured.
I'll try second option, I will build OpenMPI 4.0.1 with --enable-heterogeneous. Thank you very much for your help. Regards, Sergio. On 3/14/2019, Gilles Gouaillardet wrote: Sergio, I think your best option here is to install an aarch64 (read 64bits ARM) distro on your raspberry pi 3. /* FWIW, the default raspberry distro is 32bits so it can run on all raspberry pi models */ If you cannot/do not wish to go that way, make sure Open MPI is built with --enable-heterogeneous This is lightly tested in the release branches, so I suggest you use Open MPI 4.0.1rc1. IIRC, Open MPI will transparently handle this scenario with the same datatype having different sizes (or endianness, but that does not apply here) on different nodes. Cheers, Gilles
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