On Fri, Apr 5, 2019 at 8:21 AM Zhang, Junchao via discuss <discuss@mpich.org> wrote:

MPI 3.1 Chapter 5.9.3 reads "MPI_CHAR, MPI_WCHAR, and MPI_CHARACTER (which represent printable characters) cannot be used in reduction operations". But the following code with MPICH does not abort.

#include <mpi.h>

#include <stdlib.h>

int main(int argc, char* argv[])

{

char a ='A',b;

MPI_Init(&argc,&argv);

if(MPI_Allreduce(&a,&b,1,MPI_CHAR,MPI_SUM,MPI_COMM_WORLD)) abort();

MPI_Finalize();

}

--Junchao Zhang

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