RFR: 8318364: Add an FFM-based implementation of harfbuzz OpenType layout [v4]

Tue Nov 7 00:00:29 UTC 2023

On Mon, 6 Nov 2023 23:28:30 GMT, Phil Race <prr at openjdk.org> wrote:

>So we have somewhere around a fixed 125ms startup cost for the FFM case - as measured on my Mac,
but only 35-40ms of that is attributable to the specific needs of layout.

That looks unfortunate. I guess if we will start to use ffm in other places we can easily spend of 1 second budget on startup=(

> layoutCnt=16000 total=193ms <<< app fully displayed
vs
> layoutCnt=16000 total=453ms <<< app fully displayed

It looks strange that 16000 calls are not enough to warmup, and the difference is so large.

-------------

PR Comment: https://git.openjdk.org/jdk/pull/15476#issuecomment-1797052585