: Huge performance problem under Windows

[Peter Kümmel]

atof is dead slow on Windows, on Linux atof is magnitudes faster.
Measured with attached patch.

Peter


Brisset, Nicolas wrote:
> Hi,
> 
>  
> 
> being an avid KDE user and working in a very Windows-centric
> organization, I'm very interested by the potential of KDE (and Qt) tools
> running under Windows. One of the projects I'm most actively involved in
> (mainly as a tester and bug reporter, though I occasionally contributed
> some code as well) is kst, a great (though not so well known)
> professional plotting tool.
> 
> I've just subscribed to this list to be able to follow progress on the
> KDE Windows front, and also to be able to get some advice on kst under
> Windows, as version 2.0.0 (due soon) will be the first to run on that
> platform. We are currently testing it and there are a few things we are
> a bit puzzled at. If anybody could give some advice, we'd be very grateful.
> 
> The 2 biggest problems we have so far are a memleak (I'll send another
> message with information on that one) and a performance problem detailed
> in the message below, which I am forwarding as it seems it did not make
> it to the list.
> 
> You can find kst code under
> https://[user]@svn.kde.org/home/kde/branches/work/kst/portto4/kst
> <https://%5buser%5d@svn.kde.org/home/kde/branches/work/kst/portto4/kst>
> (of course also available with anonymous svn, though not from behind a
> proxy…), as far as I know it currently requires any Qt 4 version (not
> necessarily the latest).
> 
>  
> 
> Kst 1.x was a KDE application, but kst 2.x is so far pure Qt (.pro
> based), though an optional KDE integration is planned down the road. I
> hope that still qualifies it to be discussed on this list J
> 
>  
> 
> Don't hesitate to ask for more information if needed,
> 
> Best regards,
> 
>  
> 
> Nicolas
> 
>  
> 
> ------------------------------------------------------------------------
> 
> *Von:* Brisset, Nicolas
> *Gesendet:* Donnerstag, 12. November 2009 17:11
> *An:* 'kst at kde.org'; 'kde-windows at kde.org'
> *Betreff:* Huge performance problem under Windows
> 
>  
> 
> Hi,
> 
>  
> 
> I had used kst windows so far on fairly small files. I had the
> impression it was slower than the Linux version but it was only
> subjective. I tried to load gyrodata.dat from the SVN repos today to
> show off the performance to a colleague. Well, it turns out it was a bad
> idea L: it takes **ages** to load (I'm talking about minutes here, don't
> discourage it will eventually appear !). I have no idea where the
> difference comes from, loading the same file under Linux with the same
> version (svn HEAD) is **instantaneous**.
> 
> Maybe the KDE-Windows folks could help there? There must be a stupid
> reason. I tried the kst 2.0.0 beta from the website (I believe it was
> compiled with VC++) and todays's SVN compiled qith Qt SDK (Creator)
> 2009.02. This is to me a blocking point for widespread use on Windows…
> 
>  
> 
> Nicolas
> 
>  
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> Kde-windows mailing list
> Kde-windows at kde.org
> https://mail.kde.org/mailman/listinfo/kde-windows
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