如何计算一秒内可执行的命令行数

#include <iostream>#include <Windows.h>using namespace std;const double N = 100000000;const double SEC = 1000; int main(){LARGE_INTEGER nFrequency;::QueryPerformanceFrequency(&nFrequency);LARGE_INTEGER nStartCounter;LARGE_INTEGER nStopCounter;::QueryPerformanceCounter(&nStartCounter);for (int i=0; i<N; ){++i;}::QueryPerformanceCounter(&nStopCounter);double nTime = 1000 * (nStopCounter.QuadPart - nStartCounter.QuadPart) / nFrequency.QuadPart;cout << N*SEC/nTime << endl;return 0;} 

 

N*SEC/nTime348432055.74912894double

跟我之前的测试有差距

SetThreadAffOn a multiprocessor computer, it should not matter which processor is called. However, you can get different results on different processors due to bugs in the basic input/output system (BIOS) or the hardware abstraction layer (HAL). To specify processor affinity for a thread, use the SetThreadAffinityMask function.