Created
January 10, 2017 15:15
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| #include <chrono> | |
| #include <iostream> | |
| #include <type_traits> | |
| template <class F, class... Args> | |
| std::chrono::duration<double> | |
| benchmark(F&& f, Args&&... args) | |
| { | |
| using clock = std::conditional<std::chrono::high_resolution_clock::is_steady, | |
| std::chrono::high_resolution_clock, | |
| std::chrono::steady_clock>::type; | |
| const auto t0 = clock::now(); | |
| std::forward<F>(f)(std::forward<Args>(args)...); | |
| return std::chrono::duration<double>(clock::now() - t0); | |
| } | |
| struct FarApart | |
| { | |
| char a; | |
| char c[128]; | |
| char b; | |
| }; | |
| struct CloseTogether | |
| { | |
| char c[128]; | |
| char a; | |
| char b; | |
| }; | |
| template<typename T> | |
| void benchmarkCache(T* t, int s) | |
| { | |
| int j = 0; | |
| for (int i = 0; i != s; ++i) { | |
| if(t[i].a == t[i].b) | |
| j++; | |
| } | |
| } | |
| int main() { | |
| constexpr auto LENGTH = 10000000; | |
| CloseTogether* ct = new CloseTogether[LENGTH]; | |
| FarApart* fa = new FarApart[LENGTH]; | |
| std::cout << "Struct with members close together takes: "<< benchmark(benchmarkCache<CloseTogether>, ct, LENGTH).count() << std::endl; | |
| std::cout << "Struct with members far apart takes: " << benchmark(benchmarkCache<FarApart>, fa, LENGTH).count() << std::endl; | |
| delete[] ct; | |
| delete[] fa; | |
| } |
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