How can I find the execution time of a section of my program in C?

Question

I\'m trying to find a way to get the execution time of a section of code in C. I\'ve already tried both time() and clock() from time.h, but it seems that time() returns seco

Answer 1

For what it's worth, here's one that's just a few macros:

#include 
clock_t startm, stopm;
#define START if ( (startm = clock()) == -1) {printf("Error calling clock");exit(1);}
#define STOP if ( (stopm = clock()) == -1) {printf("Error calling clock");exit(1);}
#define PRINTTIME printf( "%6.3f seconds used by the processor.", ((double)stopm-startm)/CLOCKS_PER_SEC);

Then just use it with:

main() {
  START;
  // Do stuff you want to time
  STOP;
  PRINTTIME;
}

From http://ctips.pbwiki.com/Timer