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Old 04-25-2007, 08:44 PM   #1
davidguygc
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Registered: Jul 2004
Location: Lubbock, Texas
Distribution: Slackware 12.0 with Beryl 0.2.1
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Still need help with timer


I posted a thread earlier, then said I figured it out. Well, no I didn't lol.

I need a timer to time how long a function takes to complete. My teacher thinks that milliseconds is enough time, but I think that the function completes in < 1 millisecond. So I need to find a function that returns time in micro or nano seconds. I'm doing this in C, on Windows (usually I'd say Linux, but my teacher won't accept Linux executables.)
 
Old 04-25-2007, 08:50 PM   #2
davidguygc
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Registered: Jul 2004
Location: Lubbock, Texas
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This is my code:
Code:
/*****************************************************************/
/* CS 2350 Spring 2007											 */
/* C section for Assignment 5                                    */
/************************ include files **************************/
//65-90 97-122
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

//#define CLOCKS_PER_SEC 1000

//External functions/variables
extern "C" void lexsort(char*,char*);
//Global functions/variables
int COUNT;
int ITER  = 0;

int main(void)
{
	putchar('\n');
	putchar(':');
	scanf("%d", &COUNT);
	//random-related statements/variables
	srand(time(0));
	int ran;

    char* input = new char[COUNT+1];
	char* output = new char[COUNT+1];	
	output[COUNT] = NULL;
	input[COUNT] = NULL;

	//time-related variables
	struct timeval before, after;
	double diff;
	int x = 0;

	while(x < COUNT)
	{
		ran = rand() % 57 + 65;
		if(ran > 90 && ran < 122)
			continue;
		else
		{
			input[x++] = ran;
		}
	}

	printf("input = %s\n\n", input);
	//implement lexsort function

	gettimeofday(&before, 0);
	lexsort(input, output);
	gettimeofday(&after, 0);
	//diff = after.tv_nsec - before.tv_nsec;
	
	//output results
	printf("output = %s\n", output);
	printf("Time to implement: %d", after.tv_usec);
	printf("\nbefore = %d", before.tv_usec);

	return 0;
}
Now, I really don't think my computer is fast enough to do a function in under 1 microsecond, (2.8 P4), but if thats the case, then I need a nanosecond timer.
 
  


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