Hi Andrew, I suggest you read Scott Meyer's book - Effective STL - Item #18: "Avoid using vector<bool>"
I was able to find the book online at: http://www.uml.org.cn/c++/pdf/EffectiveSTL.pdf Cheers, Erik On 04-09-2010, at 00:27, Andrew Cunningham wrote: > Hi, > I am looking at a performance slow-down introduced after using some > osg::Switch groups. > > I did some performance benchmarking on std::vector<bool> and I found > push_backs are 10x slower than std::vector<int>, and more importantly, the > simple [] operator is about 20x slower(*). I am not sure it is the smoking > gun yet, as I will need to back-track a lot of code, but it looks possible. > > This is because std::vector<bool> is specialized in the STL to be a memory > efficient packed vector. > > I am not so sure that the memory (<bool> vs say <unsigned char> ) saved is > really worth the performance hit in the case of osg::Switch > > (* Win32, _SECURE_SCL=0, Studio 2008) > > Andrew > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=31323#31323 > > > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
