On 1/19/19 1:09 PM, Daniel wrote:
>
> After compiling I get the following behavior:
>
> bash-3.2$ mpirun -np 4 ./step-18
>
> fem group size: 3 comm:3
>
> fem group size: 3 comm:3
>
> fem group size: 3 comm:3
>
> fem group size: 3 comm:32766
The problem here is that only 3 of the processes participate in the
communicator. But you ask the question of the group size on all processes:
MPI_Comm_size( FEM_Comm ,&size_fem_comm);
Here, FEM_Comm is a communicator object that is really only initialized on the
three participating processes, whereas it is uninitialized on the fourth and
consequently you are getting pointless answers there.
You have the same problem again at the end of the same block, where every
process creates a TopLevel object using FEM_Comm, but really only on three of
the processes is this object valid.
After creating the subset communicator, you need to have an if statement of
the form
if (this process is participating in the subset communicator)
{
do everything else
}
Best
W.
--
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Wolfgang Bangerth email: [email protected]
www: http://www.math.colostate.edu/~bangerth/
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