FFTs are communication dominated. It is not at all surprising that
a small FFT runs faster on one node than distributed. What is your
network?
On Fri, Sep 26, 2003 at 09:45:37PM +0800, Wa-Kun Lam wrote:
>
> >If you are using 2.1.5, and you don't have good results with FFTW,
> >there is something wrong with your setup. I have used 2.1.5 extensively
> >and have found it to be almost 100% scalable.
> I do use fftw 2.1.5. I think I setup fftw in correct way because I
> install it according to document step by step. By the way, have to try
> my code? Is the effeciency bad in your side too?
> _______________________________________________
> This list is archived at http://www.lam-mpi.org/MailArchives/lam/
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