lame benchmarks (pun intended)

[Hans_]

@Piru

According to the lame readme on os4depot, the AmigaOS4 version also lacks altivec support (the porter couldn't get it working properly). The A1-X1000's CPU has an altivec unit.

Hans

[Hans_]

So we know two things:
- Altivec use is great and speeds up some multimedia demanding tasks 2x
- X1000 is champion in same fair category of non altivec use, in this case. Good, so its worthwhile after all as "new miggy champ"

Not so fast. If mufa did indeed use an altivec enabled version, then nothing can be concluded in the non-altivec case. Wait until mufa confirms what he did (preferably by rerunning his tests and explicitly recording the version of lame that he used each time).

Hans

[Hans_]

@wawrzon


Still dunno how 1.8ghz can be the same as 1.4ghz by tests. Something wrong somethere still.

CPU performance is affected by a lot more than just the clock speed. The design of the pipe-line also affects performance, a long with a heap of other design factors. One of PASemi's goals was energy efficiency, and the G4's design may have delivered higher performance per clock at the cost of greater energy consumption.

I'm not saying that this is how it is (I haven't looked at it in detail), just that it is possible.

Hans

[Hans_]

Indeed. Now, would Hans_ & kas1e please figure this thing out already? OS4 *does* have altivec enabled lame.

I heard you the first time when you pointed out that the old g4 version was in the archive (which I completely overlooked).

In the meantime I got tired of waiting, so here are my A1-X1000 lame results for aksack.wav:

Code: [Select]

5.RAM Disk:> lame aksack.wav
LAME 3.98.4 32bits (http://www.mp3dev.org/)
Using polyphase lowpass filter, transition band: 16538 Hz - 17071 Hz
Encoding aksack.wav to aksack.wav.mp3
Encoding as 44.1 kHz j-stereo MPEG-1 Layer III (11x) 128 kbps qval=3
    Frame          |  CPU time/estim | REAL time/estim | play/CPU |    ETA
 10529/10529 (100%)|    0:29/    0:29|    0:30/    0:30|   9.2340x|    0:00
-------------------------------------------------------------------------------
   kbps        MS  %     long switch short %                                  
  128.0      100.0        76.1  13.4  10.5                                    
Writing LAME Tag...done
ReplayGain: +0.5dB

5.RAM Disk:> lame.g4-3.98.2 aksack.wav
LAME 3.98.2 32bits (http://www.mp3dev.org/)
Using polyphase lowpass filter, transition band: 16537 Hz - 17071 Hz
Encoding aksack.wav to aksack.wav.mp3
Encoding as 44.1 kHz j-stereo MPEG-1 Layer III (11x) 128 kbps qval=3
    Frame          |  CPU time/estim | REAL time/estim | play/CPU |    ETA
 10529/10529 (100%)|    0:17/    0:17|    0:18/    0:18|   16.010x|    0:00
-------------------------------------------------------------------------------
   kbps        MS  %     long switch short %                                  
  128.0      100.0        76.1  13.4  10.5                                    
Writing LAME Tag...done
ReplayGain: +0.5dB

5.RAM Disk:> data:
5.Data:> lame aksack.wav          
LAME 3.98.4 32bits (http://www.mp3dev.org/)
Using polyphase lowpass filter, transition band: 16538 Hz - 17071 Hz
Encoding aksack.wav to aksack.wav.mp3
Encoding as 44.1 kHz j-stereo MPEG-1 Layer III (11x) 128 kbps qval=3
    Frame          |  CPU time/estim | REAL time/estim | play/CPU |    ETA
 10529/10529 (100%)|    0:30/    0:30|    0:31/    0:31|   8.9321x|    0:00
-------------------------------------------------------------------------------
   kbps        MS  %     long switch short %                                  
  128.0      100.0        76.1  13.4  10.5                                    
Writing LAME Tag...done
ReplayGain: +0.5dB

5.Data:> lame.g4-3.98.2 aksack.wav
LAME 3.98.2 32bits (http://www.mp3dev.org/)
Using polyphase lowpass filter, transition band: 16537 Hz - 17071 Hz
Encoding aksack.wav to aksack.wav.mp3
Encoding as 44.1 kHz j-stereo MPEG-1 Layer III (11x) 128 kbps qval=3
    Frame          |  CPU time/estim | REAL time/estim | play/CPU |    ETA
 10529/10529 (100%)|    0:17/    0:17|    0:17/    0:17|   16.010x|    0:00
-------------------------------------------------------------------------------
   kbps        MS  %     long switch short %                                  
  128.0      100.0        76.1  13.4  10.5                                    
Writing LAME Tag...done
ReplayGain: +0.5dB

Hans