(j3.2006) Liaison to IFIP WG 2.5
Wed Aug 22 16:32:34 EDT 2007
On Wednesday 22 August 2007 11:54, Lawrie Schonfelder wrote:
> You appear to be angry about parameterised data types
I am not angry. They are useful and provide consistency. But they are not
nearly as useful to *real* scientific programmers as is parallelism.
Pragmatism is more important than purism in cases like this...
> I would claim that there is no, absolutely null, nil,
> applications that can be programmed with co-arrays that cannot be
> programmed more succinctly without them.
We should distinguish here between applications and algorithms. An application
is a problem to be solved by a computer. Sure, any problem that can be solved
in parallel can be solved in serial as well. But parallel *algorithms* cannot
be programmed with existing Fortran. And people design and use them. So
explicit parallelism is necessary.
> That makes co-arrays very
> different conceptually
Sure, we can argue philosophy all day.
> and practically.
Yes, explicit parallelism is much more important practically than any
type-system feature added since derived types in F90.
Aleksandar Donev, Ph.D.
Lawrence Postdoctoral Fellow @ LLNL
High Performance Computational Materials Science and Chemistry
E-mail: donev1 at llnl.gov
Phone: (925) 424-6816 Fax: (925) 423-0785
Address: P.O.Box 808, L-367, Livermore, CA 94551-9900
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