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

[Greg Hellings]

On Thu, Apr 23, 2009 at 11:58 AM, Martin Gruner <mg.pub at gmx.net> wrote:
> They released 4.5.1 today. Maybe there is an improvement?

And just last night I rebuilt 4.5.0 since I didn't see a new release
on the site.  Well, off to give it a try!

--Greg

>
> 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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