[SciPy-dev] Dropping djbfft ?

Robert Kern robert.kern@gmail....
Mon May 12 20:56:20 CDT 2008


On Mon, May 12, 2008 at 8:26 PM, David Cournapeau
<david@ar.media.kyoto-u.ac.jp> wrote:
> Pearu Peterson wrote:
>>
>> djbfft is important for applications that need only the 2^n sizes support
>> and here djbfft have speed advantage over other fft implementations.
>> For some of these applications the fft speed can be crusial.
>
> Are you sure djbfft speed advantage is still true today ? When I run
> scipy.fftpack.bench, I hardly see any different between fftw3 and
> djbfft, and the current use of fftw3 is less than optimal (we can at
> least get a two fold increase with an improved design, because right
> now, we are using the worst possible plan method).
>
> When I run the benchmarks, the only backend significantly faster than
> the other ones is the MKL.

Neither djbfft vs. fftw nor djbfft vs. MKL are definitive comparisons.
Not everyone can use GPLed code or proprietary code.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless
enigma that is made terrible by our own mad attempt to interpret it as
though it had an underlying truth."
 -- Umberto Eco


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