Timing a function

[abp]

Hi All

My friend has this problem where he needs to measure the time spent inside
a function in *Milliseconds*. I cant find any libary which allows measuring of time in
milliseconds ? The best is to use the following code

#include <time.h>

static time_t start=NULL;
static time_t stop=NULL;

#define START time(&start)
#define STOP time(&stop)

static void get_time()
{
printf(&quot;Time elapsed is %.6lf&quot;, difftime(stop, start));
}

START;
function_to_time();
STOP;
get_time();

This code is able to return elapsed time in seconds. Since the function of interest takes much
lesser time than 1 sec, the accuracy has to be in milliseconds.

Any help is appreciated.

Thanks in advance

Anand

 

[rbobbitt]

Take a profiling tools like gprof.
Russ
bobbitts@hotmail.com

http://home.earthlink.net/~bobbitts

 

[ArnoMantwill]

Use function ftime(). There you'll get milliseconds.

Arno

 

[abp]

Hi !

I found that the following code does the work.

static clock_t begin=NULL;
static clock_t end=NULL;

static void start()
{
begin = clock();
}

static void stop()
{
end = clock();
}


#define START start()
#define STOP stop()

static void get_time()
{
var_nextmsg(&quot;The time taken for the function is %lf milliseconds\n&quot;, 1000.0*(end-begin)/CLOCKS_PER_SEC);
}

Thanks for help by all!

Anand