Function Timer

[ernesth]

hello,
I am attempting to time some algorithms that I am testing, but, it seems as though I can't figure out how to time with enough precision (as you can probably guess, I keep getting run times of 0).
The method that I am using is as follows:
#include <time.h>

clock_t start, finish;
float runningTime;

start = clock();

//call function to be timed

finish = clock();

runningTime = (float) (finish-start)/CLOCKS_PER_SEC;

How do I get the time to be more precise? I have tried other forms of the method shown above, but have not had any real success. Most of the timing methods that I have looked up only deal with obtaining various forms of the date, or the time of day, not with being able to time small algorithms. Is there a method where I can call clock(), or some form of clock(), and receive the time in microseconds or nanoseconds?
Any help will be appreciated.

Thanks,
ErnestH

 

[dds82]

I did this once, but I don't remember if this is what I came up with. But, it's something to try in any case.

AFAIK,

runningTime = (float) (finish-start)/CLOCKS_PER_SEC;

calculates the time in seconds. To get a more precise timing, divide by a different number. For example, to get hundredths, try

runningTime = (float) (finish-start)/(CLOCKS_PER_SEC/100);