164170 - High cpu usage

Status: RESOLVED INVALID

(Core :: Layout, defect)

Description

[bugsbugs]

On some site, there are high cpu usage (>97%). The
usage does not drop until some tab is closed. There
were multi-tabs. No really easily reproduceble.

Comment 1

[bugsbugs]

Attachment: 1000 of ltrace on the process.

I ltraced it for a while. 3MB log file.
Attached the top 1000 lines.

Comment 2

[bugsbugs]

Attachment: a few gdb backtrace of the process

backtrace with gdb #1

Comment 3

[bugsbugs]

Attachment: #2 backtrace

Comment 4

[bugsbugs]

Attachment: #3 btrace

Comment 5

[bugsbugs]

Attachment: #4 btrace

Comment 6

[bugsbugs]

Attachment: #5 btrace

Comment 7

[bugsbugs]

I am working on zh_CN locale. Don't know if that matters.
Debian sid system.

Comment 8

[Mats Palmgren (inactive)]

Which Mozilla build are you using?
Please provide URL(s) where this problem occurs, thanks.

Comment 9

[bugsbugs]

It's one a nightly ID 2002082122. I don't think I 
can have it reproduced at will. :) So cannot give
url for now. 

Comment 10

[John Levon]

Have you reproduced this on a recent mozilla build ?

Comment 11

[bugsbugs]

This seems to be caused by loading several pages with scrolling text or a page
with several
scrolling text. The scrolling text keep mozilla eat a lot of CPU (the timer thing?)

Now I don't know if this really qualify as a bug or is just the DHTML effeciency
thing.

Comment 12

[Boris Zbarsky [:bzbarsky]]

It's hard to tell without a testcase or url that shows the problem....  As in,
could you actually provide one?  "scrolling text" doesn't say much, since there
are so many ways to do it....

Comment 13

[Alexander Opitz]

Since over 1 month no answer from the reporter, so closing bug as invalid.
If the bug exists in newer builds (1.4 final) then look for a similar bug or
reopen this bug.