[Mpi3-bwcompat] MPI timer requests

[Dave Goodell]

Sure, that sounds like a reasonable justification.  I just wanted to make sure that you actually had that before you went forward to the Forum, since that's one of the things that I always ask when someone brings a new proposal to the whole group and it wasn't present on your original slides.

-Dave

On Mar 8, 2011, at 1:06 PM CST, Jeff Squyres wrote:

> 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
>> 
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> 
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> Jeff Squyres
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