BTW, disabling 'kern' makes it more than twice faster! On 13-04-15 03:59 PM, Behdad Esfahbod wrote: > On 13-04-15 03:52 PM, Khaled Hosny wrote: >> On Mon, Apr 15, 2013 at 03:48:26PM -0400, Behdad Esfahbod wrote: >>> On a private thread (which I wish was on the public list) with Konstantin we >>> were measuring performance of harfbuzz-ng vs old and I noticed that shaping >>> with Amiri roughly involves hundreds of lookups. Unfortunately OpenType >>> shaping runtime is at best linear in the number of lookups. Any chance you >>> can look into possibly consolidating some of those? >> >> I didn’t consider this before, but probably I can do something. How do >> you measure the performance? > > Added --num-iterations for that. > > I'm testing with: > > $ echo "هو أمّا حكومة القاذفات مكن, وفي تنفّس الشرقي لهيمنة أن. هو قام هزيمة > وأزيز اندلاع, ومن أي وبداية الواقعة. و إخضاع" | time hb-shape > ~/fonts/amiri-0.105/amiri-regular.ttf --output-file /dev/null --shaper old > --num-iterations=10000 > 8.88user 0.00system 0:08.91elapsed 99%CPU (0avgtext+0avgdata > 17120maxresident)k > 0inputs+0outputs (0major+1190minor)pagefaults 0swaps > > Note that if I choose the fallback shaper, essentially 98.5% of the time goes > away! :( > > $ echo "هو أمّا حكومة القاذفات مكن, وفي تنفّس الشرقي لهيمنة أن. هو قام هزيمة > وأزيز اندلاع, ومن أي وبداية الواقعة. و إخضاع" | time hb-shape > ~/fonts/amiri-0.105/amiri-regular.ttf --output-file /dev/null --shaper old > --num-iterations=10000 --shaper fallback > 0.15user 0.00system 0:00.15elapsed 99%CPU (0avgtext+0avgdata > 12976maxresident)k > 0inputs+0outputs (0major+899minor)pagefaults 0swaps > > > I'll be looking for ideas to speed these up. But given the popularity that > Amiri is gaining on the web, would be nice to try to optimize on both sides. > > behdad > > > > >> Regards, >> Khaled >> >
-- behdad http://behdad.org/ _______________________________________________ HarfBuzz mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/harfbuzz
