(j3.2006) [MPI3 Fortran] Feedback from Fortran J3 meeting
Thu May 29 01:43:16 EDT 2008
Bill Long wrote:
> Keith Bierman wrote:
>>On May 28, 2008, at 10:56 AM 5/28/, Craig Rasmussen wrote:
>>>I wonder how C does this? What are the rules for code motion in C?
>>>I'll ask around.
>>Highly prescribed by their Standard. Fortran's advantage has been
>>much more latitude to the optimizer.
>>While the Committee has always preferred to design more generic
>>solutions, MPI is an important special case ... it might just be a
>>lot easier to have an optional part of the Standard which puts MPI in
>>as special modules ...
> I see this as very backward looking. We've done a lot of work to
> produce a native parallel programming model within Fortran that lacks
> these problems that MPI has. Producing a whole optional part of the
> standard just to accommodate a legacy library that one would expect,
> over time, to fall by the wayside, seems like a bad idea on multiple fronts.
I very much doubt that Coarray Fortran will ever overtake MPI in usage.
Failure to support MPI in Fortran might drive those MPI users away from
> If vendors are currently getting it "wrong", how is it possible that so
> many people are using MPI today? I'm yet to be convinced there is a
> real problem.
MPI works very well at low optimization levels.
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