Well, for the record, I have now tried numerous instances of restricted
pointers and the speedups have been positively zero. I did at least
identify a couple of places where the code was spending more time than I
thought, and I made a ~5% improvement to the performance, but it still
eludes me how the PMEMD Fortran code can be so much faster than my C
implementation if the often-discussed pointer restriction problem doesn't
account for any significant difference. I will be removing all pointer
restrictions; the risk is too great for a statistically insignificant
benefit.
Dave
> Thanks to all who have replied; I did not take the emacs editor to be
> authoritative, just an indicator that I was not the only one who thought
> that restrict was the correct reserved keyword. Apparently, __restrict__
> works on both gcc and icc. I will be sparing in my use of this
> construction, but am attempting to improve the direct space inner loop to
> make use of it.
>
> Dave
>
>
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Received on Mon Aug 29 2011 - 13:30:04 PDT
