[Lazarus] IDE Editor incredibly slow on newer GTK2

[Bernd]

I cannot reproduce the extreme slowness anymore, no matter what I do.
What I have now is only generally relatively high CPU usage compared
to Qt and some stuttering when scrolling, but the extreme lag and
sluggishness when simply typing text is gone. I don't know what caused
it and I don't know what made it go away (I did *not* restart X, it
just went away from one moment to the other (and no there were no
other processes running also)).

2012/3/25 Martin <lazarus at mfriebe.de>:
> please attach your editor options

see attachment

> Define SYNFONTDEBUG and watch the log when the IDE starts
>  TheFontStock.CalcFontAdvance: ........ eto=True

No messages with "eto" at all.

> If true, your font is problematic. Try an other one
> (Also happens, if your system can have font sizes of half-pixel. That may be
> the case with newer gtk. In that case: change the size.)

Envy Code R, size 10. This is the font size this font was optimized
for, most other sizes would look ugly anyways, (at least the smaller
ones). Changing the font and also the antialiasing settings was the
first thing I tried when the problem appeared but it did not make any
difference at all.

> So time to go for the defines I originally mentioned:
>    SynCaretDebug   SYNSCROLLDEBUG   VerboseSynEditInvalidate
> SynCheckPaintLock
>
> Watch for paint. It gives the rectangle that is painted.
> it always paints full width. So left/right will be a big diff.
> But it should only point 1 or 2 lines ( a line has between 10 and 20 pixel,
> depend on font). Watch Top Bottom
>
> There may be a 2nd paint with left/richt all to the right (10 pixel on the
> right: that is the overview gutter. Its an embedded panel, so it does not
> interfere with the rest of paint)

The following is when I grep for PAINT and press a key three times.
There will only be one paint per key press which seems ok to me
(actually there are a few more paints every now and then when  the
cursor blinks but also only one for cursor on and one for cursor off)

PAINT SynEdit1:TIDESynEditor sfHasScrolled=False rect=l=0,t=374,r=689,b=408
PAINT SynEdit1:TIDESynEditor sfHasScrolled=False rect=l=0,t=374,r=689,b=408
PAINT SynEdit1:TIDESynEditor sfHasScrolled=False rect=l=0,t=374,r=689,b=408

and here is some more output unfiltered for one keypress, surounded by
a bit of focus change and cursor blinking:

SynEditCaret CreateCaret for HandleOwner=SynEdit1:TIDESynEditor
DebugShowCount=0 Width=2 pref-width=2 Height=15  FCurrentCreated=False
FCurrentVisible=False
SynEditCaret SetPos for HandleOwner=SynEdit1:TIDESynEditor x=119 y=375
SynEditCaret ShowCaret for HandleOwner=SynEdit1:TIDESynEditor FDebugShowCount=0
SynEditCaret DestroyCaret for HandleOwner=SynEdit1:TIDESynEditor
DebugShowCount=1
SynEditCaret CreateCaret for HandleOwner=SynEdit1:TIDESynEditor
DebugShowCount=1 Width=2 pref-width=2 Height=15  FCurrentCreated=False
FCurrentVisible=False
SynEditCaret SetPos for HandleOwner=SynEdit1:TIDESynEditor x=119 y=375
SynEditCaret ShowCaret for HandleOwner=SynEdit1:TIDESynEditor FDebugShowCount=0
PAINT SynEdit1:TIDESynEditor sfHasScrolled=False rect=l=119,t=374,r=121,b=389
SynEditCaret HideCaret for HandleOwner=SynEdit1:TIDESynEditor FDebugShowCount=1
SynEditCaret ShowCaret for HandleOwner=SynEdit1:TIDESynEditor FDebugShowCount=0
TCustomSynEdit.InvalidateTextLines SynEdit1:TIDESynEditor FirstLine=27
LastLine=28
  TCustomSynEdit.InvalidateTextLines TLazSynTextArea FirstLine=26
LastLine=27 rect=l=55,t=374,r=676,b=408
  TCustomSynEdit.InvalidateTextLines TLazSynTextArea FirstLine=26
LastLine=27 rect=l=55,t=0,r=676,b=0
TCustomSynEdit.InvalidateTextLines SynEdit1:TIDESynEditor
TCustomSynEdit.InvalidateGutterLines SynEdit1:TIDESynEditor
FirstLine=27 LastLine=28
  TCustomSynEdit.InvalidateGutterLines TLazSynGutterArea FirstLine=26
LastLine=27 rect=l=0,t=374,r=55,b=408
  TCustomSynEdit.InvalidateGutterLines TLazSynGutterArea FirstLine=26
LastLine=27 rect=l=676,t=374,r=689,b=408
  TCustomSynEdit.InvalidateGutterLines TSourceLazSynSurfaceGutter
FirstLine=26 LastLine=27 rect=l=0,t=0,r=55,b=0
  TCustomSynEdit.InvalidateGutterLines TSourceLazSynSurfaceGutter
FirstLine=26 LastLine=27 rect=l=676,t=0,r=689,b=0
TCustomSynEdit.InvalidateGutterLines SynEdit1:TIDESynEditor
SynEditCaret SetPos for HandleOwner=SynEdit1:TIDESynEditor x=126 y=375
PAINT SynEdit1:TIDESynEditor sfHasScrolled=False rect=l=0,t=374,r=689,b=408
SynEditCaret HideCaret for HandleOwner=SynEdit1:TIDESynEditor FDebugShowCount=1
SynEditCaret ShowCaret for HandleOwner=SynEdit1:TIDESynEditor FDebugShowCount=0
SynEditCaret HideCaret for HandleOwner=SynEdit1:TIDESynEditor FDebugShowCount=1
SynEditCaret DestroyCaret for HandleOwner=SynEdit1:TIDESynEditor
DebugShowCount=0
PAINT SynEdit1:TIDESynEditor sfHasScrolled=False rect=l=126,t=374,r=128,b=389


> For all else:
> run in valgrind. and see where the CPU goes

Maybe a sampling profiler like oprofile would be a better idea because
most of the CPU actually goes to the X server process and also
valgrind is painfully slow, next to unusable on my old hardware, I
suspect I would have to wait an hour until I see the first IDE window
appearing.

I suspect a GTK and/or xorg bug or flaw. There will be a new Ubuntu
version in April, maybe the entire problem will go away, the 11.10 I
am currently using is not known for great freedom from defects
anyways.

Should the effect ever re-appear I will try to profile it and make
more logs with the above defines, meanwhile I thank you for your
assistance, since I am now more and more suspecting a bug in GTK
itself I don't want to waste too much of your time.

Bernd
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