[bt-devel] Try profiling? (was: Windows performance issue)

[Martin Gruner]

They released 4.5.1 today. Maybe there is an improvement?

mg

On Thursday 23 April 2009 18:34:13 Greg Hellings wrote:
> On Thu, Apr 23, 2009 at 2:14 AM, Matthew Talbert <ransom1982 at gmail.com> 
wrote:
> >>> A quick Google suggests the tool you want is called "Visual Studio
> >>> Profiler" and that it is part of Visual Studio 2008.  See
> >>> http://msdn.microsoft.com/en-us/magazine/cc337887.aspx for one article
> >>> about it.
> >>
> >> That looks like it will do exactly what I need.  As soon as I'm done
> >> rebuilding Qt 4.5, I'll give it a whirl (probably tomorrow, at this
> >> point, unless Qt 4.5 builds incredibly faster now that I've disabled
> >> examples and demos).  Thanks for finding that for me - I should have
> >> seen it in front of my face the whole time!
> >
> > Looks to me like this tool only comes with "Team" versions of Visual
> > Studio. I'd suggest AMD code analyst.
>
> Matthew,
>
> That seems to have done what I need.  It doesn't give the level of
> detail that the version integrated with VS does (function or
> line-level detail) but it does give details of which .dll/.exe/.sys
> files are taking up the execution time.
>
> I tested the system by opening BibleTime, running my mouse up and down
> the Bookshelf, opening the Bible branch, opening the English Bibles
> and then opening either the KJV or the ESV (I've tested with both).
> Comparing the performance of the binary built against 4.4.3 with the
> performance of the binary built against 4.5.0:
>
> The 4.4.3 version spends almost all of its time in processor.sys (Idle
> Processes) and other system calls which takes up about 55 seconds of
> the whole process.  The top Qt/BibleTime component is QtCored4.dll
> which takes 1.63 seconds over the total. libsword.dll took 1.02
> seconds, and all other of our own components came in further down the
> tree.
>
> The 4.5.0 version still has processor.sys at the top with 57 seconds
> of time, but now QtCored4.dll has taken 13.33 seconds, QtSvgd4.dll is
> at 2.19 seconds, QtGuid4.dll at 1.95 seconds, libsword.dll still only
> at 1.3 seconds and so on down the list.
>
> In both builds, bibletime.exe takes up less than 0.01 seconds.  I ran
> this across several tests and got statistically identical results each
> time.
>
> Call me a cynic, but it seems somehow Qt 4.5 on my Windows system
> achieves performance far worse than I could possibly have suspected.
> Anyone have ideas of where to go from here?
>
> --Greg
>
> > Matthew
> >
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