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7955929
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2011-10-31T15:36:44.253
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2011-10-31T15:41:47.123
LastEditDate
2017-05-23T12:01:05.443
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7955794
PostTypeId
2
Score
2
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text
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You should always worry about performance and efficiency when your profiler tells you so (you can be that profiler, but you have to 'measure', not guess). Things you can do: <ol> <li>pre-allocate capacity: <pre><code> std::vector<int> x(1000); // size() is 1000 std::vector<int> y; y.reserve(1000); // size() is 0, capacity is 1000 </code></pre></li> <li>use a custom allocator <ul> <li>have a look at <a href="http://www.boost.org/doc/libs/1_47_0/libs/pool/doc/index.html" rel="nofollow noreferrer">Boost Pool</a></li> <li>have a look at <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2271.html" rel="nofollow noreferrer">EASTL</a> (specialized for embedded/game programming) <ul> <li><a href="https://stackoverflow.com/questions/87096/stl-alternative">STL Alternative</a></li> <li><a href="https://stackoverflow.com/questions/5742597/eastl-versus-stl-how-can-there-be-such-a-performance-difference-in-stdvector">EASTL versus STL, how can there be such a performance difference in std::vector<uint64_t>::operator[]</a></li> </ul></li> </ul></li> </ol> The first option is clearly the quick win; The second option is more involved and I only recommend it when your heap profiler tells you that fragmentation is causing problems. For heap profiling, I suggest <ul> <li>valgrind massif (see <a href="http://valgrind.org/docs/manual/ms-manual.html#ms-manual.using" rel="nofollow noreferrer">Using Massif and ms_print</a>)</li> </ul>
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