On Mon, Nov 23, 2015 at 1:15 PM, Nicolas George <geo...@nsup.org> wrote: > Le tridi 3 frimaire, an CCXXIV, Ganesh Ajjanagadde a écrit : >> I do recall that, but mandelbrot has issues with such benchmarks due >> to variable number of iterations as I observed while playing with it >> and as pointed out by Michael. It was hence that I proposed the inner >> loop benchmark which although it does not get rid of this issue, >> should reduce the scope of such things. > > I am not sure what this means? Should we understand that two consecutive > runs of: > > ffmpeg -lavfi mandelbrot -f framecrc - > > ... will not execute in exactly the same way? If so, I think that an option > for deterministic runs is urgent. > > If not, then I do not see the problem.
Sorry, was vague. The number of iterations depends on the parameters of the filter. Under fixed settings, one can compare different benchmarking runs. However, the problem is that changing the parameters of the filter (and fixing it across runs) may show a different relative change in performance for the proposed code change with mandelbrot. The inner loop may remain less affected by such things. I guess picking default settings for the filter is reasonable here. After all, benchmarking is not perfect anyway. > > Regards, > > -- > Nicolas George _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
