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Re: Strange computational time with fftn


From: Marco Caliari
Subject: Re: Strange computational time with fftn
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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