Open Bug 277123 Opened 16 years ago Updated 11 years ago

Chews up lots of CPU on a page with a big form.

Categories

(Core :: Layout: Form Controls, defect)

x86
Linux
defect
Not set
normal

Tracking

()

People

(Reporter: augart, Unassigned)

References

()

Details

(Keywords: perf, testcase)

Attachments

(1 file)

This is on the latest nightly build (Build ID: 2005010405), Linux/i686.

Pentium 4, 1.8 GHz, 1.5 GiB RAM, unloaded.



Problem: Mozilla chews up huge amounts of CPU when displaying the page.
It chews up more CPU time when shutting down.

How to reproduce:

## First, I timed starting up mozilla with a blank homepage, then
## immediately shutting it down (with control-Q, File=>Quit):

~/JikesRVM/Lists $ time mozilla

real    0m4.200s
user    0m1.540s
sys     0m0.070s

## Next, I timed starting up mozilla with my sample page (I'll attach
## a copy of this sample page).  Then I immediately exited with Control-Q.
## (When I submit the form, it chews up even more CPU time.)



~/JikesRVM/Lists $ time mozilla $PWD/jc3.html

real    0m42.866s
user    0m29.090s
sys     0m0.660s
Extract it to a directory, CD there, and try:
time mozilla $PWD/jc3.html
Looks to me related/a duplicate of bug 148636.
Component: General → Layout: Form Controls
Product: Mozilla Application Suite → Core
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Depends on: 148636
Keywords: testcase
I can't reproduce this problem.  On my p3-733, the page loads in 20 seconds and the browser is responsive throughout...
(In reply to comment #4)
> I can't reproduce this problem.  On my p3-733, the page loads in 20 seconds and
> the browser is responsive throughout...

agree WFM FF & SM (on windows, don't have linux) - responsive and 10-20sec, thinkpad T40
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.6) Gecko/20060728 Firefox/1.5.0.6

reporter, Steven Augart, is not reachable
Assignee: general → nobody
QA Contact: general → layout.form-controls
I profiled the testcase; unfortunately the profile is too big to conveniently upload.

About 10% of the time is spent setting up text inputs.  Marking this dependent on the bug about that.  We should retest once they're fixed.
Status: UNCONFIRMED → NEW
Depends on: 221820
Ever confirmed: true
Are we still not lazy with starting up the editors for the text inputs? So that we only fire up an editor once the user focuses the textfield (and possibly once the value is changed from javascript). That seems like an obvious place to start otherwise.

It'd be cool if all we did was to have a few normal frames that made up the textbox until we really need editor to kick in. Though maybe that is hard to do while making sure that the textbox looks exactly the same once editor is there?

Of course, an alternative is to make editor not suck :)
> Are we still not lazy with starting up the editors for the text inputs?

Yes.  See bug 221820 (which this bug depends on) for my attempts to make it lazy, and the editor brokenness that ran into.

> It'd be cool if all we did was to have a few normal frames 

That's exactly what I tried to do.

> Though maybe that is hard to do while making sure that the textbox looks
> exactly the same once editor is there?

The look was fine.  But the editor blew away and recreated the DOM, which confused drag/drop, clicks, etc.  The solution is to have editor edit the existing DOM and nuke the <br> crap in plaintext editor.  See the dep chain for this bug.  ;)
I benchmarked the testcase here using a stupid (new Date()).getTime() comparison.  Without bug 221820, this test loaded on average in 2014ms, and with bug 221820, it loaded on average in 1094ms.
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