[Webkit-unassigned] [Bug 214866] New: Profiler resolution is too low

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=214866

            Bug ID: 214866
           Summary: Profiler resolution is too low
           Product: WebKit
           Version: Safari 13
          Hardware: Macintosh
                OS: Unspecified
            Status: NEW
          Severity: Enhancement
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: radexpl at gmail.com
                CC: inspector-bugzilla-changes at group.apple.com

Hi. It appears that the Safari/webkit web inspector profiler samples stack traces approximately every 1ms. This is slow, and not suitable for many profiling tasks, since I'm only going to get a handful of samples when trying to hit 60fps, or react to an event in 50ms. By comparison, it appears that Chrome's Timeline profiler samples stacks every 100us.

Is there a technical reason why WebKit's profiler can't go up to 10kHz? If there's a tradeoff (slow processing, significantly degraded performance), can this be made configurable?

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