[Qt-creator] Qt Creator response too slow

[Roberto Raggi]

Hey,

I'm definitely not a win32 freaks but... please can you try to revert  
the change c3a3ab96641087e21974782a1d99f4cdc9c24efd
?

ciao robe



On 08.05.2009, at 14:40, <Juha.Ruotsalainen at nokia.com> wrote:

> Hello to all Win32 API-freaks!
>
> File: C:\Qt\2009.02\qt\src\corelib\io\qfsfileengine_win.cpp
> Function: QFSFileEnginePrivate::getPermissions(void)
> Line 1700: "if(ptrGetEffectiveRightsFromAclW(pDacl, &trustee,  
> &access_mask) ..."
>
> That Win32 API-call to GetEffectiveRightsFromAcl()triggers the Windows
> Domain Controller calls, and consequently 0.3 second delay per that  
> call.
>
> Looking at the call stack we find:
> 00 QFSFileEnginePrivate::getPermissions(void)+0x268
> 01 QFSFileEngine::fileFlags(...)+0x9a
> 02 QFileInfoPrivate::hasAccess()+0x5e
> 03 QFileInfo::isWritable(void)+0x2d
> 04 TextEditor::BaseTextDocument::isReadOnly(void)+0x8e
>
> And this recurs time to time. TextEditor-plugin checks for read  
> only, and that propagates to file engine, and eventually Win32  
> effective rights query.
>
> --
> jussi
>
>
> -----Original Message-----
> From: qt-creator-bounces at trolltech.com [mailto:qt-creator-bounces at trolltech.com 
> ] On Behalf Of Ettrich Matthias (Nokia-D-Qt/Berlin)
> Sent: 08 May, 2009 13:58
> To: qt-creator at trolltech.com
> Subject: Re: [Qt-creator] Qt Creator response too slow
>
>
> endEditBlock() will emit the cursorPositionChanged()-signals. The  
> position of
> the main cursor is connected to  
> BaseTextEditor::slotCursorPositionChanged().
> There are also other signals emitted, meaning the problem could lie  
> anywhere.
>
> Please continue profiling using a profiler, we still have no way to  
> reproduce
> any of that :-{
>
> Matthias
>
>
> On Friday 08 May 2009 12:38:18 pm Ruotsalainen Juha (Nokia-S/Oulu)  
> wrote:
>> For anyone interested:
>> I added a QTime::start() and elapsed() lines around  
>> 'cursor.endEditBlock()'
>> in basetexteditor.cpp's line 820 (snapshot downloaded this  
>> morning). When I
>> experience slow responses in Creator (for my test runs)  
>> endEditBlock() at
>> that line takes around 1.8 seconds to complete.
>>
>> Without testing a bit, I would imagine all the sluggishness is due to
>> something lengthy happening in endEditBlock(). Quickly looking at the
>> endEditBlock() implementation, it is playing around with
>> QSharedDataPointer-stuff. That may cause network accesses somewhere  
>> in the
>> background.
>>
>> --
>> jussi
>>
>> -----Original Message-----
>> From: qt-creator-bounces at trolltech.com
>> [mailto:qt-creator-bounces at trolltech.com] On Behalf Of ext Boy  
>> Lenssen
>> Sent: 07 May, 2009 15:30
>> To: qt-creator at trolltech.com
>> Subject: Re: [Qt-creator] Qt Creator response too slow
>>
>> Sounds like you're on the good route! I believe the lasting time  
>> (about
>> 300 ms) is about what I'm experiencing (or maybe a bit more...not  
>> sure)
>>
>> -----Original Message-----
>> From: Juha.Ruotsalainen at nokia.com  
>> [mailto:Juha.Ruotsalainen at nokia.com]
>> Sent: donderdag 7 mei 2009 13:37
>> To: qt-creator at trolltech.com
>> Subject: Re: [Qt-creator] Qt Creator response too slow
>>
>> Valgrind, good as it is, is N/A for Vista.
>>
>> I did a quick trial runs with Sysinternals' Process Monitor. Test  
>> setup
>> was the same in both cases: same project, same code file, same  
>> point in
>> a method, hit enter at that line.
>>
>> The main difference between 1.0 and 1.1 is that the latter does  
>> ends up
>> spending 0.3 of a second at the nearest Windows Domain Controller
>> (\\xxwdc101\PIPE\samr) doing pipe operations: writing, reading and
>> calling
>> FileSystemControl (FSCTL_PIPE_TRANSCEIVE). These DC accesses  
>> occurred 14
>> times in my small log with each occurrence lasting for about 0.2-0.3
>> seconds.
>>
>> You doin' some funky pipe stuff in QtCreator now ;)
>>
>> --
>> jussi
>>
>>
>> -----Original Message-----
>> From: qt-creator-bounces at trolltech.com
>> [mailto:qt-creator-bounces at trolltech.com] On Behalf Of ext  
>> Aleksandar D.
>> Balalovski
>> Sent: 07 May, 2009 14:19
>> To: qt-creator at trolltech.com
>> Subject: Re: [Qt-creator] Qt Creator response too slow
>>
>> On Thu, May 7, 2009 at 1:15 PM,  <Juha.Ruotsalainen at nokia.com> wrote:
>>> Is there some option to enable humongous debug/event logs that would
>>
>> help in pinpointing where time is spent?
>>
>>
>> Maybe with valgrind?
>
>
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