49884 - large textarea takes 100% of CPU on reload

Status: VERIFIED FIXED

(Core :: DOM: Editor, defect, P2)

Description

[Peter Lubczynski]

Start NT's task manager CPU graph so it's visible. Load the testcase. Now reload 
the test case and watch the CPU go up to 100% for quite a while, much longer 
than it took on the first load.

Comment 1

[Peter Lubczynski]

Attachment: testcase with large textarea

Comment 2

[Peter Trudelle]

->editor

Comment 3

[rubydoo123]

I would suspect that this has to do with incremental reflow issues -- Anthony, 
can you verify that, and if that is the case, please reassign to layout for 
resolution

Comment 4

[rubydoo123]

adding perf and moving to m19

Comment 5

[Blake Ross]

confirming

Comment 6

[rubydoo123]

reviewed by Bijal and beppe, setting to nsbeta3+, p2

Comment 7

[anthonyd]

okay, on my machine, whether i do a reload, or a shift+reload, the CPU does 
spike to 100% for split second, but then its business as normal.  The funny 
thing is, if I change focus and then change back I get the same spike.

anthony
continuing investigation

Comment 8

[anthonyd]

Okay, I need mroe information on this bug.  Blake, you were able to repro this 
on 9-3-2000, is there anymore infor you can give me, how long does it peg the 
cpu?  Without a test case that demonstrates this to me i will have to invalidate 
this bug.

anthony

Comment 9

[Peter Lubczynski]

I just tried this again and it doesn't seem to be doing the same thing it was
before. Looks like the problem has gone away.

There is something weird now though. Everytime you reload the page, according to
the Task Manager, memory drops by a few k.

Comment 10

[rubydoo123]

*** Bug 47452 has been marked as a duplicate of this bug. ***

Comment 11

[anthonyd]

okay, there must be some sort of misunderstanding, I know very well how to use 
task manager, so I will try again:
1. Do you still see the problem?
2. If yes, how long does it peg the cpu to 100?

Thanks,
Anthony

Comment 12

[Phil Peterson]

As currently described, PDT thinks this is an nsbeta3-. We're not signing up to
prevent CPU spikes during program execution. Hangs, yes, but not brief spikes.

Comment 13

[anthonyd]

Marking this bug as WORKSFORME.
anthonyd

Comment 14

[Randell Jesup [:jesup] (needinfo me)]

Bug 48211 (duped to this through 47647 -> 47452 -> this) appears to be fixed now
also.  Typing in textareas seems to be fine now.  Problem went away sometime
late last week.

Comment 15

[sujay]

verified in 9/29 branch build.