Rick, In my understanding, sensorgroup is a group with only task 1 Consequently, sensorComm is - similar to MPI_COMM_SELF on task 1 - MPI_COMM_NULL on other tasks, and hence the barrier fails
I suggest you double check sensorgroup is never MPI_GROUP_EMPTY and add a test not to call MPI_Barrier on MPI_COMM_NULL Makes sense ? Cheers, Gilles On Saturday, October 15, 2016, Marlborough, Rick <rmarlboro...@aaccorp.com> wrote: > Designation: Non-Export Controlled Content > > Folks; > > I have the following code setup. The sensorList is an > array of ints of size 1. The value it contains is 1. My comm world size is > 5. The call to MPI_Barrier fails every time with error “invalid > communicator”. This code is pretty much copied out of a text book. I must > be doing something wrong. I just don’t see it. Can anyone else spot my > error? I am using v2.01 on red hat 6.5. > > > > Thanks > > Rick > > > > > > MPI_Comm_group(MPI_COMM_WORLD, &worldgroup); > > MPI_Group_incl(worldgroup, 1, sensorList, &sensorgroup); > > MPI_Comm_create(MPI_COMM_WORLD, sensorgroup, &sensorComm); > > MPI_Barrier(sensorComm); > > 3.1.1001 >
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