[mpich-discuss] Poor scaling of MPI_WIN_CREATE?

[Jed Brown]

On Wed, May 30, 2012 at 11:14 AM, Timothy Stitt <Timothy.Stitt.9 at nd.edu>wrote:

> This is a good point Jed. Can I be sure that the current xt-mpich2 library
> on the Cray systems doesn't exploit the DMAPP routines already...before I
> invest time in writing something myself?
>

Well, if they were good citizens and released their code (even IBM does
this), it would be trivial to find out. As it is, you can either ask them
(and take their word for it) or read the disassembly.


>
> Isn't the whole point of a "vendor optimized MPI" that they would have
> done this? Is there a semantic reason why MPI_Win_create() cannot be
> implemented in this fast way using DMAPP?
>
>
>  *Tim Stitt* PhD (User Support Manager).
>
> Center for Research Computing | University of Notre Dame |
> P.O. Box 539, Notre Dame, IN 46556 | Phone:  574-631-5287 | Email:
> tstitt at nd.edu
>
>
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