> 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? Thanks, -mandeep
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