Re: [Boost-users] [Boost.MPI] question about serializingcustomobject

Subject: Re: [Boost-users] [Boost.MPI] question about serializingcustomobject
From: Matthias Troyer (troyer_at_[hidden])
Date: 2010-08-27 01:58:34

On Aug 27, 2010, at 2:05 AM, Robert Ramey wrote:

> Dave Abrahams wrote:
>> BoostPro Computing, http://boostpro.com
>> Sent from coveted but awkward mobile device
>> 
>>> If one were using heterogenious machines, I could understand the
>>> usage of MPI types. But as I understand it, the MPI serialization
>>> presumes that the machines are binary compatible.
>> 
>> You're mistaken.
>> 
>>>  So I'm just not seeing this.
>> 
>> Start reading here:
>> http://www.boost.org/doc/libs/1_39_0/doc/html/mpi/tutorial.html#mpi.skeleton_and_content
>> and all will be revealed
> 
> lol - I've read that several times.  I just never found it to be very 
> revealing.  The word skeleton seemed pretty suggestive. It's still not clear 
> to me how such a think can work between heterogeneous machines.  For 
> example, if I have an array of 2 byte integers and they each need to get 
> transformed one by one into a 4 byte integer because that's closest MPI data 
> type, I don't see how the fact that the "shape" doesn't change helps you. 

MPI will take care of that for you.

> So when I read the documentation I didn't find an obvious answer to this 
> question. Admitadly my attention span is pretty short when I'm looking at 
> something just because I'm curious rather than really needing a solution to 
> my problem.  So maybe its OK if one has more time to spend on it.
> 
> Robert Ramey
> 
> 
> 
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