412898 - Timers return erratic results +/- 25%

Status: RESOLVED WORKSFORME

(Core :: DOM: Core & HTML, defect)

Description

[John Resig]

When using setTimeout or setInterval (with a delay of 20ms) the delay between function calls will randomly spike and drop +/- 25% of the expected delay (ignoring the fact that the delay is increased to 25ms, which is detailed in another bug).

See the following graphs for context:
http://ejohn.org/files/timers-20.png
http://ejohn.org/files/intervals-20.png

and the blog post in the URL.

The expected result is that the delays between calls remains within some level of tolerance (I would assume that 25% would be too high). I'm working on pulling together timer log data to accompany this bug.

Comment 1

[John Resig]

Fixed in the nightlies:
http://ejohn.org/files/ff3-timers.png

(left column is 0, 10, 15ms setInterval, right column is 0, 10, 15ms setTimeout)