[Beowulf] RE: Compare and contrast MPI implementations

Dan Stromberg strombrg at dcs.nac.uci.edu
Tue Dec 20 14:30:13 PST 2005

I believe I'd prefer a "do the best you know how for the current host"
option, than a default that suddenly optimizes where it didn't before...

On Tue, 2005-12-20 at 16:53 -0500, Robert G. Brown wrote:
> On Tue, 20 Dec 2005, Mark Hahn wrote:
> > scheme.  it's rather disappointing to find out how often users compile code
> > with something like "gcc *.c -o whatever" and expect it to work well without
> > optimization flags...
> Of course in the best of all possible universes gcc *.c -o whatever
> would produce optimally optimized code totally automagically WITHOUT
> flags at least wrt the native compile host... where really the only
> tradeoffs a user might want to make by hand are to optimize for length
> of program vs performance.
> Yeah, yeah, reality is complex and life is hard (and then you die) so
> this doesn't usually work.  But it IS the ideal.  After all, anything
> you might do to pick flags for optimal performance a computer can do for
> you, if you make it smart enough and self-capability-aware enough.
> My enduring dream is for a linux computer (and its compilers/libraries)
> to become self-capability-aware enough to do better at this sort of
> thing than all but the smartest programmers.
>     rgb
> >
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