[MPI3 Fortran] Request for a straw vote.
crasmussen at newmexicoconsortium.org
Fri Jun 12 12:35:53 CDT 2009
Very good. I forgot about ASYNCHRONOUS. So I think the problem is
solved then. Copy-in/copy-out doesn't matter for blocking calls and
the ASYNCHRONOUS attribute will be used on the non-blocking calls.
On Jun 12, 2009, at 11:28 AM, Jim Xia wrote:
> mpi3-fortran-bounces at lists.mpi-forum.org wrote on 06/12/2009
> 12:52:00 PM:
> > However, there was an earlier discussion raised by Jim about how a
> > compiler might want to copy-in/copy-out even if for assumed-shape
> > arrays. I think Jim's example had to do with copying vector sized
> > objects even though the user is only using a portion of a vector.
> > So does DIMENSION(..) restrict copy-in/copy-out?
> I don't remember I raised discussion on this very topic, but this is
> a valid argument. In short, DIMENSION(..) alone will not restrict
> copy-in/copy-out. The most effective way to suppress copying is
> through VOLATILE/ASYNCHRONOUS attribute on the dummy argument.
> Jim Xia
> XL Fortran Compiler Test
> IBM Toronto Lab at 8200 Warden Ave, Markham, On, L6G 1C7
> Phone (905) 413-3444 Tie-line 313-3444
> email: jimxia at ca.ibm.com
> D2/YF7/8200 /MKM
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