Re: [Gomp-discuss] GOMP Requirements v1.1

[Scott Robert Ladd]

Ross Towle wrote:
> Under the Effects section is:
>       in some cases, how code is reorganized depends on the threading
> model in use
>
> I have a problem with this statement and its implications.
>
> I very strongly believe that the outlined parallel region/work-sharing
> region and the OpenMP runtime support routines called from the user
> program should be EXACTLY the same no matter what threading model is
> used.  If the runtime support routines are modeled after the OpenMP
> spec model then  the threading model only affects how the support
> routine is implimented.  To me, supporting multiple thread models and
> multiple targets is much easier by modifying the guts of the runtime
> support routines than the changes to be made in the compiler.

You may be correct.

However, we're going to take a significant performance hit as compared 
to commercial compilers. Commercial vendors focus on a single threading 
model and hardware architecture; they can fine-tune their compilers for 
the vagaries of (for example) Opteron NUMA systems, accounting for 
memory architectures and processor characteristics.

Perhaps I should reword the sentence to say:

    in some cases, how code is reorganized may depend on the target
    architecture

Does that seem more sensivle?

--
Scott Robert Ladd
site: http://www.coyotegulch.com
blog: http://chaoticcoyote.blogspot.com