Le tridi 3 frimaire, an CCXXIV, Ganesh Ajjanagadde a écrit : > It seems like getting rid of the sqrt altogether has a very slight > positive impact (if any at all). I can post the patch, but would like > to know what to benchmark. There are numerous choices, e.g > draw_mandelbrot as a whole, the outer loop, or the inner loop. > I personally think the inner x loop (lines 268-388) is a good place to > look at, since the difference is very small anyway, and further > localization is impossible.
The smallest unit that is usually (or always) called as a whole. Otherwise, you may find you did shave 10 cycles on a 30 cycles task that is always called after a 100M cycles task, and find speed ×1.5 instead of negligible. In this case, that would be draw_mandelbrot(), and you can do the benchmark using just ffmpeg.c and the shell's timing utilities. (You made the same mistake for deshake.) Regards, -- Nicolas George
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