1 // g++ -O3 -DNDEBUG benchmarkX.cpp -o benchmarkX && time ./benchmarkX 2 3 #include <iostream> 4 #include <Eigen/Core> 5 6 using namespace std; 7 using 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 main(int argc,char * argv[])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