On 2/2/23 09:32, Rahul Gopalan Ramachandran wrote:
Is Utilities::MPI::broadcast supposed to do the same as MPI_Bcast? I
wanted an integer to be sent to all the ranks. So this is what I wrote:
Utilities::MPI::broadcast(mpi_communicator,rand_seed,0);
However, it seems to be not sending the variable.
Using MPI_Bcast as follows does the job.
MPI_Bcast(&rand_seed, 1, MPI_INT, 0, mpi_communicator);
Is my usage wrong or is it a bug?
The only difference is that MPI_Bcast puts the result into the first
argument it is passed, whereas MPI::broadcast returns it. So you
probably want to write
rand_seed = Utilities::MPI::broadcast(mpi_communicator,rand_seed,0);
to assign the value at all processes.
Best
W.
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