[Development] Question about QCoreApplicationData::*_libpaths

[Milian Wolff]

On Dienstag, 19. Januar 2016 11:51:42 CET Marc Mutz wrote:
> I missed one:
> 
> On Monday 18 January 2016 23:43:37 Marc Mutz wrote:
> >     #include <QVector>
> >     #include <string>
> >     
> >     int main() {
> >     
> >         QVector<QByteArray> l;
> >         int oldC = l.capacity();
> >         for (int i = 0; i < 10000000; ++i) {
> >         
> >             char buf[std::numeric_limits<int>::digits + 1];
> >             sprintf(buf, "%d", i);
> >             l.push_back(buf);
> >             int newC = l.capacity();
> >             if (newC != oldC)
> >             
> >                 qDebug("%d", newC);
> >             
> >             oldC = newC;
> >         
> >         }
> >     
> >     }
> >     
> >     $ time ./test
> >     <snip>
> >     real    0m1.769s
> >     user    0m1.572s
> >     sys     0m0.192s
> 
> Same with std::vector<QByteArray>:
> 
> real    0m1.776s
> user    0m1.616s
> sys     0m0.156s
> 
> > best of three runs, core i7-2720QM, GCC 5.3
> 
> Ditto.
> 
> So... is realloc actually the optimisation everyone (incl. me) expected it
> to be?

Did you run it through a profiler? Where is the time actually spent?

-- 
Milian Wolff | milian.wolff at kdab.com | Software Engineer
KDAB (Deutschland) GmbH&Co KG, a KDAB Group company
Tel: +49-30-521325470
KDAB - The Qt Experts
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