On 26.02.2005, at 02:44, Jay Cox wrote :
Dual 2.5ghz g5 mac, mac os x 10.3.8 CVS gimp Changelog revision 1.10539
Linear Gradient blend on a 3000x3000 pixel image (Dithering on) 1 Processor: 7.98 seconds 1x 2 processors: 5.20 seconds 1.5x 3 processors: 5.23 seconds 1.5x
Linear Gradient blend on a 3000x3000 pixel image (Dithering OFF) 1 processor: 3.89 seconds 1x 2 processors: 2.37 seconds 1.7x 3 processors 2.40 seconds 1.7x
Oh, I wouldn't have though that disabling dithering makes such a difference but indeed it does.
Same game on Dual Opteron again with latest sources:
Linear Gradient blend on a 3000x3000 pixel image (Dithering on) 1 processor: 7.5 s 2 processors: 9.6 s 4 processors: 9.6 s
Linear Gradient blend on a 3000x3000 pixel image (Dithering OFF) 1 processor: 3.0 s 2 processors: 2.5 s 4 processors: 2.5 s
Each time determined over three runs. Deviation is too small to measure.
So with dithering there's a loss and without a slight win on this box with several threads.
Servus,
Daniel
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