Thanks Dr. Bangerth for the clarification, that makes sense!
Regards,
Rahul
> On Feb 2, 2023, at 5:37 PM, Wolfgang Bangerth wrote:
>
> 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(_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.
>
>
> --
>
> Wolfgang Bangerth email: bange...@colostate.edu
> www: http://www.math.colostate.edu/~bangerth/
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