How to calculate Execution time in milliseconds?
if i use time() function i can get the result only in seconds .
What about clock function ? How to print the difference using clock_t variable?
ts=clock();
quicksort(x,0,size-1);
printf("Time elapsed: %f\n", ((double)clock() - ts) / CLOCKS_PER_SEC);
its only resulting in Seconds .
Last edited by infantheartlyje; 10-14-2011 at 12:57 AM.
If you're on Windows...
Now if you're not on Windows...Code:#include <windows.h> #include <stdio.h> int main(void) { long long int Elapsed; Elapsed = GetTickCount(); // do something really long here... printf("That took %lld milliseconds", GetTickCount() - Elapsed); return 0; }
Code:// ?????
Yes. Its not windows programming. Any way thank you.Originally Posted by CommonTater
How about telling us what it is (reducing the space to 1), rather than what it isn't (which merely reduces N to N-1).
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
On all *nix systems, you can use gettimeofday();
With that you can get to upto nanoseconds accuracy.
Do you want the wall-clock time or the actual time that the processor is running your code?
Very helpful. Thanks a lot !!!
Actual time that the processor is running.
Then you should probably use clock() instead of gettimeofday().
Code:clock_t t0, t1, elapsed; t0 = clock(); /* Call function */ t1 = clock(); elapsed = 1000 * (t1 - t0) / (CLOCKS_PER_SEC); printf("Avg elapsed time: %ld ms\n\n", elapsed);
Last edited by iceaway; 10-14-2011 at 02:15 AM.
But by using this clock() function i couldn't get the milliseconds ?
If you read the man page I linked to, you would see that dividing the return value from clock() with CLOCKS_PER_SEC gives you the result in seconds. Hence, if you multiply (t1 - t0) by 1000 before you divide by CLOCKS_PER_SEC you get the result in milliseconds. Or you can divide (t1 - t0) by (CLOCKS_PER_SEC/1000) if you expect very long times which could cause wraparounds.
Also read the "Conforming to" and see if any of that applies to you.
This is what I've used:
Works in Windows with Pelles C. Standard C though.Code://add: #include <time.h> //and in your program: clock_t start, stop; start = clock(); //rest of the program here stop = clock(); printf("\n Elapsed Time: %.3lf seconds\n", (double)(stop-start)/CLOCKS_PER_SEC);
