687978 - editing in mozillazine sucks CPU

Status: RESOLVED DUPLICATE of bug 595671

(Core :: Graphics, defect)

Description

[Wayne Mery (:wsmwk)]

editing in mozillazine sucks CPU. I've had this problem for a while. I suspect it's a regression, but I'm not sure. I don't have a trace so I don't know if it's editor, or some other area like reflow.

steps   
1. visit http://forums.mozillazine.org/posting.php?mode=quote&f=31&p=11212145
2. hit spacebar multiple times in the middle of the editable text.

observe cpu usage in the 20-50% range.  And, at it's worst, if Firefox is loaded up with lots of tabs I've seen it bring the entire computer to its knees.  

The mozillazine comment section contains
 div id="message-box"
		textarea name="message" id="message" rows="15" cols="76" tabindex="4" onselect="storeCaret(this);" onclick="storeCaret(this);" onkeyup="storeCaret(this);" onfocus="initInsertions();" class="inputbox"

                                                      
Contrast this with editing comment in a new bug (text area) which uses far less CPU
1. https://bugzilla.mozilla.org/enter_bug.cgi?product=Core
2. hit spacebar multiple times in the middle of the editable text.

observe cpu usage in the 2-5% range. max 15% if you hold spacebar down solid


perhaps a duplicate of one of these https://bugzilla.mozilla.org/buglist.cgi?type1-0-0=substring&keywords=perf&keywords_type=allwords&list_id=1329643&field0-0-0=short_desc&bug_severity=major&bug_severity=normal&type0-0-1=substring&field0-0-1=keywords&type1-0-1=allwordssubstr&resolution=---&classification=Client%20Software&classification=Components&query_format=advanced&type0-0-0=anywordssubstr&component=Editor&component=General&component=Layout&component=Layout%3A%20Block%20and%20Inline&component=Layout%3A%20Floats&component=Layout%3A%20Form%20Controls&component=Layout%3A%20HTML%20Frames&component=Layout%3A%20Images&component=Layout%3A%20Misc%20Code&component=Layout%3A%20R%20%26%20A%20Pos&component=Layout%3A%20Tables&component=Layout%3A%20Text&component=Layout%3A%20View%20Rendering&field1-0-0=short_desc&product=Core&field1-0-1=short_desc

Comment 1

[Boris Zbarsky [:bzbarsky]]

If this is a regression, can you find the regression range?

That said, a profile shows almost all our time being spent building display lists and layers, and a bit painting text....  No editor time in there at all.

Comment 2

[(no longer active)]

Yeah, I also think there's something weird happening in gfx...

Comment 3

[Joe Sabash [:JoeS1]]

I'm probably one of the most prolific editors there at Mozillazine, and have not had, or heard of a problem.
Normally I use an oldish system to do my editing there (no hardware accel} but for testing purposes I tested in win7 with the following graphics specs:
        
Adapter Description Intel(R) HD Graphics
Vendor ID8086
Device ID0042
Adapter RAM Unknown
Adapter Driver sigdumd64 igd10umd64 igdumdx32 igd10umd32
Driver Version 8.15.10.2202Driver Date8-25-2010
Adapter RAM (GPU #2)Unknown
Adapter Drivers (GPU #2)Unknown
Direct2D Enabledtrue
DirectWrite Enabledtrue (6.1.7601.17563)
ClearType Parameters ClearType parameters not found
WebGL RendererGoogle Inc. -- ANGLE (Intel(R) HD Graphics) -- OpenGL ES 2.0 (ANGLE 0.0.0.740)
GPU Accelerated Windows 1/1 Direct3D 10

Tested with:
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:9.0a1) Gecko/20110920 Firefox/9.0a1
 
I'm not able to duplicate the high CPU symptom.

Comment 4

[Jeff Muizelaar [:jrmuizel]]

(In reply to Wayne Mery (:wsmwk) from comment #0)
> editing in mozillazine sucks CPU. I've had this problem for a while. I
> suspect it's a regression, but I'm not sure. I don't have a trace so I don't
> know if it's editor, or some other area like reflow.

Can you paste the graphics section of about:support?

Comment 5

[Wayne Mery (:wsmwk)]

hmm, I'm surprised the direct2d is blocked because I had updated the driver a couple weeks ago and I know it had been running with direct2d enabled. I don't know when it went back to being blocked again - perhaps after a reboot or an update.  Anyway, no matter, because I believe the perf issue predates any changes I've done to video in the past month  ...

RDPDD Chained DDUnknownRDPDDUnknownUnknownBlocked for your graphics card because of unresolved driver issues.false (6.1.7601.17563)DISPLAY1 [ Gamma: 2200 Pixel Structure: RGB ClearType Level: 100 Enhanced Contrast: 200 ] DISPLAY2 [ Gamma: 2200 Pixel Structure: RGB ClearType Level: 50 Enhanced Contrast: 300 ] Blocked for your graphics card because of unresolved driver issues.0/36. Blocked for your graphics card because of unresolved driver issues.

Graphics is ATI Radeon HD 4550 driver 8.881.0.0 7/28/2011 <==

i'm running nightly 20110919030912

Comment 6

[Wayne Mery (:wsmwk)]

perhaps what I am seeing is Bug 595671 - Animated images (GIFs) cause severe performance issues. I saved the mozillazine html complete, deleted all the gifs, then reloaded, and I don't see high CPU when editing.

Make sense?

Comment 7

[Wayne Mery (:wsmwk)]

(In reply to Wayne Mery (:wsmwk) from comment #6)
> perhaps what I am seeing is Bug 595671 - Animated images (GIFs) cause severe
> performance issues. I saved the mozillazine html complete, deleted all the
> gifs, then reloaded, and I don't see high CPU when editing.

perhaps further confirmation of this idea, is I don't see the problem when editing kb articles on mozillazine, eg http://kb.mozillazine.org/index.php?title=Files_and_folders_in_the_profile_-_Thunderbird&action=edit

Comment 8

[Wayne Mery (:wsmwk)]

:( I rebooted and my direct2d is back in business. However, now I can't reproduce 
ATI Radeon HD 4550   10029540512aticfx64 aticfx64 aticfx32 aticfx32 atiumd64 atidxx64 atiumdag atidxx32 atiumdva atiumd6a atitmm648.881.0.07-28-2011UnknownUnknowntruetrue (6.1.7601.17563)DISPLAY1 [ Gamma: 2200 Pixel Structure: RGB ClearType Level: 100 Enhanced Contrast: 200 ] DISPLAY2 [ Gamma: 2200 Pixel Structure: RGB ClearType Level: 50 Enhanced Contrast: 300 ] Google Inc. -- ANGLE (ATI Radeon HD 4550   ) -- OpenGL ES 2.0 (ANGLE 0.0.0.740)