Getting an accurate execution time in C++ (micro seconds)

Question

I want to get an accurate execution time in micro seconds of my program implemented with C++. I have tried to get the execution time with clock_t but it\'s not accurate.

Answer 1

If you are looking how much time is consumed in executing your program from Unix shell, make use of Linux time as below,

time ./a.out 

real    0m0.001s
user    0m0.000s
sys     0m0.000s

Secondly if you want time took in executing number of statements in the program code (C) try making use of gettimeofday() as below,

#include 
struct timeval  tv1, tv2;
gettimeofday(&tv1, NULL);
/* Program code to execute here */
gettimeofday(&tv2, NULL);
printf("Time taken in execution = %f seconds\n",
     (double) (tv2.tv_usec - tv1.tv_usec) / 1000000 +
     (double) (tv2.tv_sec - tv1.tv_sec));