Re: [boost] [MPI] Boost.MPI Review

From: Markus Blatt (Markus.Blatt_at_[hidden])
Date: 2006-09-16 05:29:14

On Sat, Sep 16, 2006 at 11:05:12AM +0200, Matthias Troyer wrote:
> 
> On Sep 16, 2006, at 10:22 AM, Markus Blatt wrote:
> 
> >
> > The question came up when I looked into mpi/collectives/broadcast.hpp:
> >
> > If this function gets called the performance will definitely be
> > suboptimal as the root will send to all others. It this just the case
> > if no MPI_Datatype was constructed (like for the linked list) or is it
> > called whenever the boost serialization is used?
> 
> OK, I see your concern. This is actually only used when no  
> MPI_Datatype can be constructed. That is when there no MPI_Datatype  
> is possible, such as for a linked list, and if you do not use the  
> skeleton&content mechanism either.
> 

So there is always a way to circumvent that. That's fair enough.

Cheers,

Markus Blatt

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