标签:blog http io os ar for sp 2014 c
// HanNuo.cpp : 定义控制台应用程序的入口点。 // #include "stdafx.h" #include"omp.h" #include<Windows.h> #include<iostream> #include<time.h> #define NUM_THREADS 2 using namespace std; int _tmain(int argc, _TCHAR* argv[]) { omp_set_num_threads(NUM_THREADS); int a[400][400];//inint matrix int counter=1; for(int i=0;i<400;i++) { for(int j=0;j<400;j++) { a[i][j]=counter; counter++; } } // for(int i=0;i<20;i++) // { // for(int j=0;j<20;j++) // cout<<a[i][j]<<" "; // cout<<endl; // } cout<<"parallel begin"<<endl; clock_t time_begin=clock(); int i=0,j=0; #pragma omp parallel for private(i,j) for(i=0;i<400;i++) for(j=i+1;j<400;j++)//从i+1开始。执行交换 { long tmp=0; tmp=a[i][j]; a[i][j]=a[j][i]; a[j][i]=tmp; } clock_t time_end=clock(); double s1=time_end-time_begin; cout<<"parallel end"<<endl; cout<<"parallel time ="<<s1<<endl; //============================================================================================================ time_begin=clock(); cout<<"serail begin"<<endl; for(int i=0;i<400;i++) for(int j=i+1;j<400;j++)//从i+1开始。执行交换 { int tmp=0; tmp=a[i][j]; a[i][j]=a[j][i]; a[j][i]=tmp; } time_end=clock(); cout<<"serail end"<<endl; double s2=time_end-time_begin; cout<<"serail time="<<s2<<endl; system("pause"); return 0; }
标签:blog http io os ar for sp 2014 c
原文地址:http://blog.csdn.net/christprince007/article/details/39692661