[Mpi3-bwcompat] MPI timer requests

[Jeff Squyres]

I had to go back and read about generalized requests to remind myself how they worked...

But now I agree with Fab.  They won't work as timers except in THREAD_MULTIPLE + multiple threads scenarios.

So I think that the timers-as-requests idea still stands...

On Mar 7, 2011, at 3:49 PM, Fab Tillier wrote:

> Jeff Squyres wrote on Mon, 7 Mar 2011 at 12:31:41
>> 
>> Dave's point about generalized requests is a good one, though -- I need to go
>> think about that and convince myself that what we're talking about isn't
>> syntactic sugar and/or why it's better to be in the MPI implementation.
> 
> In a MPI_THREAD_SERIALIZED implementation, you can't use call MPI_GREQUEST_COMPLETE if you're already calling MPI_WAITANY.  Depending on generalized requests would require MPI_THREAD_MULTIPLE support for this functionality.
> 
> Note that for some implementations, making MPI_GREQUEST_COMPLETE thread-safe could be trivial, but there's no MPI_THREAD_MOSTLY_SERIALIZED option so there's no standard way of noting that some things are thread safe while others are not - it's either all or nothing.
> 
> -Fab
> 
> _______________________________________________
> Mpi3-bwcompat mailing list
> Mpi3-bwcompat_at_[hidden]
> http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi3-bwcompat


-- 
Jeff Squyres
jsquyres_at_[hidden]
For corporate legal information go to:
http://www.cisco.com/web/about/doing_business/legal/cri/