Hi again:
Simon Burge wrote:
>
> Simon Burge wrote:
>
> > I'll let you know of some results soon.
>
> My early tests on a 200MHz UltraSparc are not that encouraging.
I'm not surprised. The performance of FFTW seems is no so good in other
machines than x86, as E. Mayer commented in a recent mail.
>
>
....... some timings ......
>
> The -C means don't checkpoint ever and -S N means print a speed update
> every N iterations. MacLucasFFTW2 is hard coded to use 2 threads. The
> case for 4609273 is iteresting, with nearly identical FFT lengths...
>
Have you used runtime wisdom or fftwtune wisdom?. A bad tune can affect
very much the
results.
Has your system two processors?. It would be interesting the better
performance for two threads if there is only a processor. Anyway, this
is other interesting feature in FFTW, the use of multithreads with no
more than a few lines of code.
> I'm assuming that you're seeing such a speed-up on Intel because of the
> lack of registers that MacLucasUNIX likes, and FFTW is doing a better
> job under these conditions.
>
I also think it.
Thanks for your interest.
| Guillermo Ballester Valor |
| [EMAIL PROTECTED] |
| c/ cordoba, 19 |
| 18151-Ogijares (Spain) |
| (Linux registered user 1171811) |
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