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

From: Douglas Gregor (doug.gregor_at_[hidden])
Date: 2006-09-16 09:55:09

On Sep 16, 2006, at 6:09 AM, Markus Blatt wrote:
> Consider a distributed array or vector. Each entry of the global
> vector has a consecutive, zero starting local index l and a
> coresponding global index g together with tag specifying whether the
> process is owner of the value (meaning that he can compute a new value
> from consistent data without communication) or not.
>
> Process 0:
> local global tag
> 0     0      owner
> 1     3      owner
> 2     4      notowner
>
> Process 1:
> local global tag
> 0     1      owner
> 1     2      owner
> 3     3      notowner
>
> This would represent a global array of 5 entries.

Very interesting. We're actually working on this very problem on a  
different project (our parallel graph library). If we come up with a  
good, general abstraction, we could try to get it into Boost.MPI. At  
the moment, however, i think Matthias has the right approach, using a  
special data-type wrapper that provides an alternative way to  
serialize the local/global array when building the skeleton.

        Doug