Hi.sorry for the bad english it's not my native languauge. I just started to discover cilk plus,but I'm already stucked. I got visual studio 2010 on my win 7. I installed intel parralell composer 2011 xehttp://software.intel.com/en-us/articles/intel-parallel-studio-xe/ Also installed cilk sdkhttp://software.intel.com/en-us/articles/intel-cilk-plus-software-development-kit/ After then I started new project set the compiler to intel c++, and checked the settings like enable cilk keywords etc, as they are in the tutorial. When I use the cilk keywords, my visual studio says
1 IntelliSense: identifier "_Cilk_spawn" is undefined But i can run the program after all. I implented the two version of fibonachi. the one with serial,and the one with parralel programing. I put a timer on the code, but after a couple of tests, the one with cilk words seems slower,than the serial one.I tested them on two different pc with different dual core processors.Pls Can anybody help me, what am i doing wrong? here are my codes. Parralel with cilk keywords: int Pfib(int n) { if(n <= 1) { return n; } else { int x,y; x = _Cilk_spawn Pfib(n-1); y = Pfib(n-2); _Cilk_sync; return x + y; } } int _tmain(int argc, _TCHAR* argv[]) { int n, result; n = 40; LARGE_INTEGER frequency; // ticks per second LARGE_INTEGER t1, t2; // ticks double elapsedTime; // get ticks per second QueryPerformanceFrequency(&frequency); // start timer QueryPerformanceCounter(&t1); /// result = Pfib(n); /// QueryPerformanceCounter(&t2); // compute and print the elapsed time in millisec elapsedTime = (t2.QuadPart - t1.QuadPart) * 1000.0 / frequency.QuadPart; cout << elapsedTime << " ms.\\n"; /// printf ("Result: %d\\n", result); system("PAUSE"); return 0; } Serial: int fib (int n) { if (n<2) return (n); else { int x, y; x = fib (n-1); y = fib (n-2); return (x+y); } } int main (int argc, char *argv[]) { int n, result; n = 40; /// LARGE_INTEGER frequency; // ticks per second LARGE_INTEGER t1, t2; // ticks double elapsedTime; // get ticks per second QueryPerformanceFrequency(&frequency); // start timer QueryPerformanceCounter(&t1); /// result = fib (n); /// QueryPerformanceCounter(&t2); // compute and print the elapsed time in millisec elapsedTime = (t2.QuadPart - t1.QuadPart) * 1000.0 / frequency.QuadPart; cout << elapsedTime << " ms.\\n"; printf ("Result: %d\\n", result); system("pause"); return 0; }