Re: [Boost-users] mpi non-blocking communication

Subject: Re: [Boost-users] mpi non-blocking communication
From: Hicham Mouline (hicham_at_[hidden])
Date: 2010-12-06 18:10:53

> -----Original Message-----
> From: boost-users-bounces_at_[hidden] [mailto:boost-users-
> bounces_at_[hidden]] On Behalf Of Riccardo Murri
> Sent: 06 December 2010 22:32
> To: boost-users_at_[hidden]
> Subject: Re: [Boost-users] mpi non-blocking communication
> 
 
> Yes, indeed.  There's a mistake in the pseudo-code I sent in my reply
> to Philipp: one must call MPI_Init_thread() before istanciating
> boost::mpi::environment.  So the correct init order is:
> 
>   MPI_Init_thread(&argc, &argv, required, &provided);
>   if (required > provided) {
>     // warning: MPI impl does not support the requested threading model
>   }
>   mpi::environment env(argc, argv);
>   mpi::communicator world;
> 
> Thanks for the correction!
> 
> Best regards,
> Riccardo
> _______________________________________________

On a related note, I posted a question to the openmpi forum.
MPI_INIT is identical MPI_INIT_THREAD(MPI_THREAD_SINGLE),
but I couldn't see the utility of having MPI_THREAD_FUNNELED.

I mean: if I mpirun a process, and then a thread that is not the main thread calls MPI_INIT only by ususal mpi::environment construction, would it work?
If not, then I would see the value of MPI_THREAD_FUNNELED

regards,