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Re: Strange computational time with fftn
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From: |
Marco Caliari |
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Subject: |
Re: Strange computational time with fftn |
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Date: |
Sat, 18 Apr 2020 09:27:53 +0200 |
On Fri, 17 Apr 2020 21:45:56 +0200
Andreas Weber <address@hidden> wrote:
> Am 17.04.20 um 21:33 schrieb Marco Caliari:
> > anybody can explain me the strange peak in elapsed time I see in
> > computing fftn for dimension 100^3 with the default planner
> > "estimate"?
>
> I can see the same on my AMD Ryzen 5 2600 Six-Core Processor.
> When reduzing the number of threads:
>
> fftw ("threads", 4)
>
> the peak is gone.
>
> -- Andy
With fftw ("threads", 4) or fftw ("threads", 8) I see a smaller peak
at n = 170.
Marco
--
Dr. Marco Caliari
Dipartimento di Informatica
Universita` degli Studi di Verona
Secondo piano, 2.03
Ca' Vignal 2
Strada le Grazie 15
37134 VERONA
tel: +39 045 802 7904
fax: +39 045 802 7068
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