1935596 - Modified Codepen demo (https://codepen.io/wodniack/pen/poOGZoX?editors=0010) spends time around GCMinor

Status: NEW

(Core :: JavaScript Engine, task, P3)

Description

[Mayank Bansal]

Go to https://codepen.io/wodniack/pen/poOGZoX?editors=0010
Change the number of rays to be 10x

Nightly: https://share.firefox.dev/3CVaTiH
Chrome: https://share.firefox.dev/41kZfYM

If you enable the drawing of rays, the profile is dominated by gfx stuff on 16 worker threads. If you disable drawing, its difficult to tell the relative speed difference.

Comment 1

[Mayank Bansal]

Attachment: Testcase_No Draw.html

Comment 2

[Mayank Bansal]

Attachment: index - Yes Draw.html

Comment 3

[Mayank Bansal]

I wonder if the " SM's one-element double-to-string cache" mentioned here is also relevent in this case.

Comment 4

[Jon Coppeard (:jonco)]

The test is creating a ton of small ropes. These are allocated in the nursery and then tenured. The promotion rate (70%) isn't high enough to disable allocating strings in the nursery. So string pretenuring (especially for concatenation) would help here.