Re: [Boost-users] [mpi] broadcast performance

Brian, You can think of Boost.MPI as a very well-designed wrapper. All it does is to call the underlying C (OpenMPI, MPICH, others) implementation when the types are covered by the MPI standard. On other hand, i agree with you, maybe would be possible to specialize a template for std::vector<T> that handles it as a raw buffer. Someone has an opinion about this? When i have time, i'll think carefully to see if i can contribute a patch. Regards, Júlio. 2012/9/6 Brian Budge

Okay. I can do that. I was just wondering if there was a trick to make it happen under the hood. I'm curious as to why Bcast doesn't get called by boost::mpi::broadcast for non-trivial types.

Thanks, Brian

On Wed, Sep 5, 2012 at 7:00 PM, Júlio Hoffimann wrote:

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Hi Brian,

If i understood correctly, you're actually doing something like:

std::vector<char> gigaVec; MPI_Bcast(blah, blah, ..., &gigaVec[0])

and want to replace that by boost::mpi::broadcast, is that correct?

Just do it the same way, if the type of the container is a MPI type, you're guaranteed that the underlying MPI implementation will be called.

Regards, Júlio.

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