On 2011-06-28 11:05:07 -0700, Peter Apian-Bennewitz said:
shouldn't "gcc -O3 -g -Wall " spot all three ?
I have no idea.
My enquiries into locating industrial funds to look into this had been
stopped then, mostly by Greg stating that setting up vectors takes
longer then gaining cycles. I don't have enough insight into the way
Radiance spends its time and the mystics of automatic vectorizing
compilers to be definitive there. Industry sources stated that anything
below a considerable speed-up-factor (say 2 at least) isn't worth
looking into.
Well...if it can shave 10% off long simulation runs I'd call that good.
IMHO, apart from speed-ups, it'll be sound if Radiance compiled on
different compilers and run.
It would. MSVC too.
Also, looking at rtrace running on eight-core systems, I am seeing CPU
times of about five times wall-clock time. I would have hoped for
something closer to 8 times wall-clock. I suspect that NFS file
locking has become a performance problem.
--
Randolph M. Fritz • rfr...@lbl.gov
Environmental Energy Technologies Division • Lawrence Berkeley Labs
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