Re: [boost] [mpi]

From: David Osipyan (David_Osipyan_at_[hidden])
Date: 2007-11-30 05:40:20

Thanks!

Gather/scatter works fine!

Is any performance increasing available when skeleton/content
are used instead of gather/scatter?

David.

-----Original Message-----
From: Matthias Troyer [mailto:troyer_at_[hidden]]
Sent: Friday, November 30, 2007 11:25 AM
To: boost_at_[hidden]; David Osipyan
Subject: Re: [boost] [mpi]

On 29 Nov 2007, at 16:46, David Osipyan wrote:

> I try to use boost.mpi in my particle-in-cell simulation code.
> I have a vector of particles. How can I send parts of this vector
> from root process to all of slaves, and send backward to root ?
> Is it possible via mpi::scatter() and mpi::skeleton/content?
>
> I need to send particles from range 0..n to first slave, n+1 ..
> 2*n+1  to second slave etc. After porocessing each slave shall
> return the new values of parts to root.

Yes, you can use scatter and gather to do that. If your data type is
an "MPI data type", and you have specialized is_mpi_datatype<T> to be
mpl::true_ to indicate this, then no skeleton/content is required but
you can just call gather/scatter on a std::vector.

Matthias

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