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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 .
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.Quote:
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).
On all *nix systems, you can use gettimeofday();Quote:
Originally Posted by infantheartlyje
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 !!!Quote:
Originally Posted by manasij7479
Actual time that the processor is running.Quote:
Originally Posted by iceaway
Then you should probably use clock() instead of gettimeofday().Quote:
Originally Posted by infantheartlyje
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);
But by using this clock() function i couldn't get the milliseconds ?Quote:
Originally Posted by iceaway
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.Quote:
Originally Posted by infantheartlyje
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);