RE: [linrad] FFT performance

[w3sz@xxxxxxxxxxxxxxxx>]

Hi, Edson!

How about posting a listing of ALL of your parameters to the list?

What is your sampling rate?  Did you check out Leif's page on hardware
performance?

Its at 

http://ham.te.hik.se/homepage/sm5bsz/linuxdsp/fft1time/fft1time.htm

This is what Leif got with a 650 MHz Pentium III:

SM 5 BSZ - First FFT timing for a large system using Pentium III
(Coppermine) at 650MHz 
(Dec 30 2000) 
------------------------------------------------------------------------
--------
 Sampling rate = 96kHz. 
No of A/D channels = 4. 
No of RF channels = 2. 
Useful bandwidth 2 x 90 kHz. 



  SIZE = 32768  16 bit no window, bandwidth 1.46Hz
Vers   Name                    Time
 0     Radix 2 DIF C           37.15%
 1     Radix 2 DIF ASM         34.95%
 2     Twin Radix 2 ASM        41.75%
 3     Radix 4 DIT C           33.92%
 4     Twin radix 4 DIT C      33.10%
 5     Twin radix 4 DIT SIMD   26.10%

   Typical operation
  SIZE = 8192  32 bit sin squared window, bandwidth 23Hz
Vers   Name                    Time
 0     Radix 2 DIF C           24.01%
 1     Radix 2 DIF ASM         22.06%
 2     Twin Radix 2 ASM        20.17%
 3     Radix 4 DIT C           22.87%
 4     Twin radix 4 DIT C      19.70%
 5     Twin radix 4 DIT SIMD   14.70%

 -------------------------------------


If we can all see all of  your parameters, maybe we can help.

73,

Roger Rehr
W3SZ   FN20ah
2 Merrymount Road
Reading, PA  19609-1718
http://www.qsl.net/w3sz



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> From: owner-linrad@xxxxxxxxxxxxxxxxxxxxx 
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