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I am trying to write (or find code for) a very high performance fft routine (I am specifically interested in the N=256 case). 
Subject: Which fft package does matlab use? From: Yair Altman Date: 29 Mar, 2013 08:11:08 Message: 2 of 13 
"Nick" wrote in message <kj2jka$o5p$1@newscl01ah.mathworks.com>... 
On 3/28/2013 6:27 PM, Nick wrote: 
On 3/29/2013 12:01 PM, dpb wrote: 
Hi dph, 
On 3/29/2013 12:16 PM, Nick wrote: 
On 3/29/2013 12:40 PM, dpb wrote: 
On 3/29/2013 1:33 PM, dpb wrote: 
I am taking the fft of each colomn of the NxN matrix rather than a single Nx1 vector to get more accurate timings. 
Subject: Which fft package does matlab use? From: Bruno Luong Date: 1 Apr, 2013 10:46:10 Message: 10 of 13 
> GFlopsMM(s) = NIter*2*size(A,1)^3/1e9/t; 
Subject: Which fft package does matlab use? From: Bruno Luong Date: 1 Apr, 2013 11:03:10 Message: 11 of 13 
Also if you have gpu hardware, the fft performs very well. 
Subject: Which fft package does matlab use? From: Steven_Lord Date: 1 Apr, 2013 15:22:01 Message: 12 of 13 

(1) benchmarking without multithreading  in windows task manager right click matlab and set processor affinity to only 1 cpu 
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