It seems the split is blocking when must return MPI_COMM_NULL, in the case I have one process with a color that does not exist in the other group or with the color = MPI_UNDEFINED.
Hi Thatyene,I took a look in your code and it seems to be logically correct. Maybe there is some problem when you call the split function having one client process with color = MPI_UNDEFINED. I understood you are trying to isolate one of the client process to do something applicable only to it, am I wrong? According to open mpi documentation, this function can be used to do that, but it is not working. Anyone have any idea about what can be?Best regardsRodrigo Oliveira