如何让多核cpu跑出sin曲线，来自编程之美

本文回顾了作者十年编程经历，从早期的Pascal到现代的C++，从简单的数学问题到复杂的图像三维重建。重点介绍了Windows API在多核环境下对CPU性能的影响，以及如何通过线程调度实现高效利用。文章详细阐述了任务间切换、CPU负载分配等关键概念，并展示了实际应用中如何优化代码以提升系统响应速度。

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int main()
{
	//::SetProcessAffinityMask(GetCurrentProcess(),0x00000001);
	HANDLE hThread[2];
	SYSTEM_INFO SI;
	ZeroMemory(&SI, sizeof(SI));
	GetSystemInfo(&SI);
	DWORD nCPU = SI.dwNumberOfProcessors;
	for (int i = 0; i <= nCPU - 1; i++)  
	{  
		hThread[i] = NULL;  
		hThread[i] = CreateThread(NULL, NULL, (LPTHREAD_START_ROUTINE )sin_thy, NULL, CREATE_SUSPENDED, NULL);  
		SetThreadAffinityMask(hThread[i],0x01<<i);  //USE MASK
		ResumeThread(hThread[i]);  
	}  
	WaitForMultipleObjects(nCPU, hThread, true, INFINITE);  
}
void sin_thy(){
	double busy_span[COUNT];	/* need to modify	*/
	double idle_span[COUNT];
	int half = INTERVAL/2;
	double radian = 0.0;

	double start_time;

	int i;

	for(i=0; i<COUNT; i++)
	{
		busy_span[i] = (double)(half + half*sin(PI*radian));
		idle_span[i] = (double)(INTERVAL - busy_span[i]);
		radian += SPLIT;
	}

	i = 0;
	while(1)
	{
		i %= COUNT;
		start_time = ::GetTickCount();//get_time();

		while((::GetTickCount()-start_time) <= busy_span[i])
			;
		Sleep(idle_span[i]);
		i++;
	}

}

多核情况下的哈，需要用到一些windows的API

记得我第一次编程，就把cpu跑100%了

转眼，十年了，从最早的PASCAL到C++，从算山峰高度到现在的图像三维重建，额