I am not sure what I did wrong. Maybe I did not use enough frames but it makes sense now. I get about 40% reduction going from 4 slices to 8. That's not unreasonable given htop shows the cpu utilisation has dropped a little. Apologies for the noise.
Thanks Rob. On Thu, 29 Jun 2023 at 17:04, Paul B Mahol <one...@gmail.com> wrote: > > > On Thu, Jun 29, 2023 at 5:45 PM Robert Beattie < > robert.scott.beat...@gmail.com> wrote: > >> I am curious as to why the performance (throughput) does not increase >> linearly with the number of slices. I am using a scale filter >> (scale=1280:720:flags=bilinear) to convert from 1080 to 720p in a stand >> alone app. >> >> When I go from 1 to 2 slices and 2 to 4 slices I see a large increase in >> throughput. However, going from 4 to 8 slices there is almost no change at >> all. Can anyone enlighten me as to the reason for this? There are plenty of >> cores available on the machines I tried it on. >> > > By increasing number of cores you increase number of slices and at same > time decrease amount of work each core needs to do for each slice as slices > are smaller and smaller. > > >> >> Thanks >> Rob >> >> _______________________________________________ >> Libav-user mailing list >> Libav-user@ffmpeg.org >> https://ffmpeg.org/mailman/listinfo/libav-user >> >> To unsubscribe, visit link above, or email >> libav-user-requ...@ffmpeg.org with subject "unsubscribe". >> > _______________________________________________ > Libav-user mailing list > Libav-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/libav-user > > To unsubscribe, visit link above, or email > libav-user-requ...@ffmpeg.org with subject "unsubscribe". >
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