[Webkit-unassigned] [Bug 235002] readPixels directly to ArrayBuffer has very high CPU usage

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Wed Jan 12 08:20:32 PST 2022


--- Comment #7 from Simon Taylor <simontaylor1 at ntlworld.com> ---
> There's also a microbenchmark for how many calls to Math.random() can be
> made in a single performance.now() tick (ie 1ms) - the idea is to  gives a
> proxy for CPU frequency, and to give additional confidence the busy loop is
> successful at triggering consistently high clocks. [iOS 15.2 has a little
> extra weirdness there as that number increases a lot when switching away
> from the tab and back again - from ~11k with busy loop enabled to ~30k.
> 14.8.1 gives ~30k from the start. Expect a new bug soon on that...]

Filed Bug 235114 with more details and a specific test case on the weird micro-benchmark results.

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