212278 - sswug.org - the task manager reports 100% cpu usage

Status: RESOLVED WORKSFORME

(Tech Evangelism Graveyard :: English US, defect)

Description

[Frederic Da Vitoria]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.4) Gecko/20030624
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.4) Gecko/20030624

just open the page then scroll up and down a few times. Each time, the cpu usage
climbs until it reaches 100% (almost all devoted to Mozilla). I did the test on
a XP Pro laptop with the same results.

Reproducible: Always

Steps to Reproduce:
1.load the page
2.scroll up and down
3.watch the cpu usage

Actual Results:  
cpu usage went to 100%

Expected Results:  
kept it's usual low profile!

Comment 1

[Olivier Cahagne]

wfm using build 2003070308 (trunk) on Win2k. CPU remains at 10%.

Comment 2

[Frederic Da Vitoria]

I downloaded Mozilla 1.5a 20030709. Same results on the W2K system. I didn't
want to install the version on my laptop just now. I did extensive tests:
upon page load, Mozilla cpu usage is 0% (fine)
drag the scroll bar completely to the bottom and back to the top: after a few
seconds, Mozilla's cpu usage "stabilizes" between 8 and 19%
second down-up: cpu between 17 and 33%
third down-up: cpu between 31 and 47%
fourth down-up: cpu between 64 and 77%
fifth  down-up: cpu at 99%
I didn't try to go further!

I did tests with more than one tab. Just closing the tab on the sswug website
brings Mozilla's cpu usage back to 0.

One thing that could influence the problem: both the W2K system and the XP Pro
system access to the Internet through the same LAN. I will try this evening
using my modem at home.

I did the same test using MSIE on the W2K system and Opera on the XP Pro laptop:
I didn't find anything abnormal.

Comment 3

[Frederic Da Vitoria]

I checked the base address http://www.sswug.org/ and I got the same behaviour,
except that I needed a little more scrollbar down-ups to reach 100%

Comment 4

[Frederic Da Vitoria]

The problem appears only if you scroll using the mouse and the scroll bar, not
if you scroll with the keyboard (using page up and page down or up arrow and
down arrow).

Comment 5

[Hermann Schwab]

Looking at the sourcecode I found they check only for ns4 browers, so netscape
4.x gets nsmenu.js, all others get iemenu.js.

The javascript console confirmed with tons of warnings and errormessages, see below.

So I assume it´s a matter of Tech Evangelism.



Warning: reference to undefined property document.layers
Source File: http://www.sswug.org/searchresults.asp?keywordstofind=random%20number
Line: 195

Warning: deprecated with statement usage
Source File: http://www.sswug.org/menus/iemenu.js
Line: 1, Column: 146
Source Code:
nt(s.style.top)+bw+"px";if(SM)
with(mc.style){mc.cwidth=width;mc.cheight=height;width=parseInt(width)+2*bw+"px";height=parseInt(height)+2*bw+"px";}}}else{mc.s.style.top=mc.stop;mc.s.style.left=mc.sleft;if(SM){mc.style.width=mc.cwidth;mc.style.height=mc.ch

Warning: function GetLeftTop does not always return a value
Source File: http://www.sswug.org/menus/iemenu.js
Line: 1, Column: 49
Source Code:
Top];if(NS) return [f.pageXOffset,f.pageYOffset];}function
GetWidthHeight(f){if(!f) f=mFrame;if(NS||SM){var
k=(OP||KQ?0:f.scrollbars.visible?20:0);return
[f.innerWidth-k,f.innerHeight-k];}else return
[GetBodyObj(f).clientWidth,GetBodyObj(f).clientHeight];

Warning: reference to undefined property dmbtbF[t]
Source File: http://www.sswug.org/menus/iemenu.js
Line: 1

Comment 6

[Bob Clary [:bc] (inactive)]

seems to work fine for me with a fast machine and a recent trunk build. please
reopen if you can reproduce.

Comment 7

[Frederic Da Vitoria]

ok, with Mozilla 1.7.3, but on the same XP Pro laptop, everything works fine.