22.09.2013, 13:24, "Etienne Sandré-Chardonnal" <etienne.san...@m4x.org>: > I don't, I have very only strong conviction from tests on a big large > program. I was hoping that someone had an idea about the cause... Would this > help to make one? > I did a quick test : inserting 10000000 items in a QMap<int32_t, int> and > QMap<int64_t, int> using rand() for key and value, measuring the delay with > QDateTime::currentMsecsSinceEpoch. > The int32 version took about 2100ms while the int64 took about 2300ms. > > So maybe this is only a memory cache issue. The difference is higher in my > app (measured with a profiler), maybe because it decreases cache efficiency > of other code parts. > > Using gcc 4.8.0 mingw64 rubenvb build, with Qt 4.8.1 > Etienne >
Now try std::map<int32_t, int> and std::map<int64_t, int> - red-black tree should work faster than QMap's skiplist. -- Regards, Konstantin _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
