23.09.2013, 12:27, "Mandeep Sandhu" <mandeepsandhu....@gmail.com>: >> Here are my results (g++ (Ubuntu/Linaro 4.7.3-1ubuntu1) 4.7.3, Intel core >> i7, 1.2GHz, 8 GB RAM). >> >> $ ./qtvsstl 10000000 >> >> Timing insertion of 10000000 items... >> QMap : 1737 msecs >> QHash : 821 msecs >> STL map : 5458 msecs >> >> Timing iteration over 10000000 items... >> QMap : 156 msecs >> QHash : 202 msecs >> STL map : 173 msecs >> >> Timing removal of random item from 10000000 items... >> Map : 0 msecs >> Hash : 0 msecs >> STL map : 0 msecs >> >> STL map seems to be the slowest for insertion. > > The above was with Qt 4.8.1. > > With Qt5.1.2, Qmap performance seems to worse (same as std::map's). > > $ ./qtvsstl 10000000 > Timing insertion of 10000000 items... > QMap : 5492 msecs > QHash : 1218 msecs > STL map : 5408 msecs > > Timing iteration over 10000000 items... > QMap : 593 msecs > QHash : 443 msecs > STL map : 120 msecs > > Timing removal of random item from 10000000 items... > Map : 0 msecs > Hash : 0 msecs > STL map : 0 msecs > > 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 -- Regards, Konstantin _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
