time in microseconds - Page 2 - High Level Programming

Optimus_P · #8 07-29-2002

my brain is not working today. alas another monday couldnt go any faster.

do you know how i can get it to display 10th and 100ths of a second also?

Perderabo · #9 07-29-2002

Change
tm->tm_sec, tv.tv_usec);
to be
tm->sec, tv.tv_usec/100000);
or
tm->sec, tv.tv_usec/10000);

Optimus_P · #10 07-29-2002

and even a basterd like myself must bow down to the awsome powers of Perderabo

Optimus_P · #11 07-30-2002

well folks the following code is just a complete listing of the code Perderabo wrote.

This will print out the 10ths 100ths microseconds (1,000,0000th) of a second.

IE:
$./a.out
9 99 999999

Code:

#include <stdlib.h>
#include <sys/time.h>
main()
{
     struct timeval tv;
     struct timezone tz;
     struct tm *tm;
     gettimeofday(&tv, &tz);
     tm=localtime(&tv.tv_sec);
printf("%d %d %d \n", tv.tv_usec/100000, tv.tv_usec/10000, tv.tv_usec);
     exit(0);
}

This is for you people that get compiling errors reguarding the TM variable. On some OSes (AIX 4.3. && 4.3.3 in my case) tm is not defined in the header so you can add this snipit to the top of the sys/time.h headerfile and then compile. (DISCLAIMER NOR I OR UNIX.COM TAKE ANY RESPONSABILITY FOR ANY OF THE CODE SHOWN IN THIS POST)

Code:

/* I added this to make the microseconds program work needed to define TM */

 #include <sys/types.h>
 #ifdef HAVE_SYS_TIME_H
 #include <sys/time.h>

 +#if !defined(TM_IN_SYS_TIME)
 +#include <time.h>
 +#endif

 #else
 #include <time.h>
 #endif

 /* ENTER YOUR NAME HERE added this on ENTER THE CURRENT DATE HERE */

auswipe · #12 07-30-2002

Quote:

Originally posted by Optimus_P
and even a basterd like myself must bow down to the awsome powers of Perderabo

Duh!

dr_wang · #13 11-21-2005

I don't understand. I need to measure how long it takes something to run in microseconds. Like this:

start

RUN CODE

end

display number of microseconds that it took to "RUN CODE"

Please help.

Perderabo · #14 11-21-2005

Call gettimeofday() before and after the sequence in question. Then subtract the "before" value from the "after" value to get elapsed time. The only tricky part is that there are two integers (seconds and microseconds) to specify the time of day. So might need to "borrow" just like subtracting month and day to get days.

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