[webkit-dev] setTimeout as browser speed throttle
mjs at apple.com
Wed Oct 1 02:34:25 PDT 2008
On Oct 1, 2008, at 1:24 AM, David Hyatt wrote:
> On Oct 1, 2008, at 2:52 AM, Darin Fisher wrote:
>> I can appreciate that you aren't interested in revisiting this
>> problem after having resolved it finally by adding the clamp. I
>> believe you when you say you had compelling evidence too.
> We are interested in revisiting the problem or we wouldn't be
> suggesting a new high resolution timer API.
I'm with Hyatt. The reason we are having this thread is precisely to
revisit the problem.
> I don't know how clear I was in the previous email, but basically it
> can take a lot of time before you see problems. What happens is a
> site makes a change, screws up and puts in an unintentional
> setTimeout loop, and then they pwn the CPU of a browser with no
> clamp. They don't discover it because every browser has a pretty
> high clamp. When we had these issues, they'd basically crop up one
> site at a time every so often. The good news is that usually the
> sites would fix the problems, but the bad news is it could take a
> while, and angry users would be switching to Firefox.
That is what I was alluding to when I said it took us 3.5 years to
first realize we had to add the clamp. The problems come and go, but
they are consistently a problem, and it can take a while to realize it.
However, the bug Mike cited seems to mention problems with the 1ms
limit on some real sites: <http://code.google.com/p/chromium/issues/detail?id=792
>. At least 5 sites are mentioned, including nytimes.
I think we are converging on some good solutions (somewhat lower basic
clamp, new highres API) and I regret if this thread has felt hostile
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