[Beowulf] cluster softwares supporting parallel CFD computing
James.P.Lux at jpl.nasa.gov
Sun Sep 17 11:49:47 PDT 2006
At 09:12 AM 9/17/2006, Geoff Jacobs wrote:
>Jim Lux wrote:
> > Yes, the software structure was badly designed for the interconnect.
> > HOWEVER, the whole point of computing resources is that I really
> > shouldn't have to design the whole software system around the
> > peculiarities of the hardware platform.
>It sure would be nice if software could be partitioned in an efficient
>manner, including considerations of interconnect topology, with a
>compiler flag. Alas, this we must still do ourselves.
I suspect that the number of people writing software for which there
IS a big dependence on interconnect properties AND for which the
compiler could actually do something useful, is fairly small
(probably more than I can count on my fingers and toes, but I doubt
it runs into the thousands).
This sort of falls in the compiler/optimizer category, and it's a
pretty non-trivial problem. Those few folks who actually write
compilers (as opposed to loading yet another syntax description into
yacc/lex) have got their hands full dealing with the easier
optimizations that are used by more people.
>This is a strange sentiment to be displaying on this list, if I may say
>so. Beowulfers sit further out on the frontier so they can derive more
>performance from their hardware budgets. The consequence of this is
>additional development time, application complexity, and sometimes
Well, yes... but one can dream, can't one? It's that "DWIM" (do what
i mean) compiler.
>Geoffrey D. Jacobs
>Go to the Chinese Restaurant,
>Order the Special
James Lux, P.E.
Spacecraft Radio Frequency Subsystems Group
Flight Communications Systems Section
Jet Propulsion Laboratory, Mail Stop 161-213
4800 Oak Grove Drive
Pasadena CA 91109
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