Re: Vectors vs Arrays performance

"Leigh Johnston" <>
Sun, 3 Jan 2010 13:08:25 -0000
We can come up with examples and counter-examples all day long.

Consider this:

int main()
    std::vector<int> v;
    lib::vecarray<int, 1000> va;
        timer t("vector: ");
        for (int i = 0; i != 1000000; ++i)
            for (int j = 0; j != 1000; ++j)
        timer t("vecarray: ");
        for (int i = 0; i != 1000000; ++i)
            for (int j = 0; j != 1000; ++j)

Which outputs (several runs done, VC++ release build, secure STL disabled):

vector: 2.9741 seconds
vecarray: 2.6782 seconds

Which indicates (for this example) that a stack based container
( is 11% quicker than std::vector.

1) std::vector contains a pointer to its elements, a stack based container
(or an ordinary array on the stack) does not
2) you may benefit from the locality of your container and other local
variables (think CPU cache)

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