Yoann Padioleau <Yoann.Padioleau@emn.fr> writes:

> Richard Jones <rich@annexia.org> writes:
>
>> On Mon, Sep 25, 2006 at 08:13:50AM -0400, Jacques Carette wrote:
>>> Over on Haskell-cafe, Simon Peyton-Jones says:
>>> "GHC 6.6 (release candidate available) supports parallel execution on 
>>> SMP machines.
>>> 
>>> Garbage collection is not parallelised yet, something we plan to fix
>>> this autumn."
>>> 
>>> A bit of competition is a good thing, isn't it?
>>
>> Can someone explain how/if this is better than using MPI for
>> parallelism?  The reason I ask is that we are starting to use MPI for
>> real on SMP machines to process our larger datasets.
>
> I guess that with a working shared-memory SMP support, you
> don't pay the communication cost you have with MPI.

Unless, of course, your MPI implementation uses shared memory on SMP systems.

-- 
|>|\/|<
/--------------------------------------------------------------------------\
|David M. Cooke
|cookedm(at)physics(dot)mcmaster(dot)ca