[Interest] QMap<int64_t> significantly slower than QMap<int32_t>

[Philippe]

I was told the QMap implementation was changed from Qt 4 to 5, to improve performances... I guess some other tests give different results?...

Philippe

On Mon, 23 Sep 2013 15:15:37 +0530
Mandeep Sandhu <mandeepsandhu.chd at gmail.com> wrote:

> Actually, everything's a little slower with Qt5. Is C++11 enabled by default? Could that be the cause of degraded performance?
>> 
>> 
>> 
>> Qt 5 uses RB tree in QMap


Ah! That explains similar performance of QMap with std::map (though iteration is slower than std::map).


But why was RB tree used when it doesn't as well as the previous skiplist based impl?


-mandeep





> 
> --
> Regards,
> Konstantin





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