1// g++ -O3 -DNDEBUG benchmarkX.cpp -o benchmarkX && time ./benchmarkX 2 3#include <iostream> 4#include <Eigen/Core> 5 6using namespace std; 7using namespace Eigen; 8 9#ifndef VECTYPE 10#define VECTYPE VectorXLd 11#endif 12 13#ifndef VECSIZE 14#define VECSIZE 1000000 15#endif 16 17#ifndef REPEAT 18#define REPEAT 1000 19#endif 20 21int main(int argc, char *argv[]) 22{ 23 VECTYPE I = VECTYPE::Ones(VECSIZE); 24 VECTYPE m(VECSIZE,1); 25 for(int i = 0; i < VECSIZE; i++) 26 { 27 m[i] = 0.1 * i/VECSIZE; 28 } 29 for(int a = 0; a < REPEAT; a++) 30 { 31 m = VECTYPE::Ones(VECSIZE) + 0.00005 * (m.cwise().square() + m/4); 32 } 33 cout << m[0] << endl; 34 return 0; 35} 36