On 2/21/06, Manav Kataria <manav@xxxxxxxxxxxxx> wrote:
> Greetings,
> Hi I wanted to profile time taken by a particular funtion in an
> application. I had been using gettimeofday() till now and calculating the
> time diff b/w the call of the function and its return.
> I read in a forum that even though it shows a resolution of microseconds
> it is incorrect. The true resolution is only the order of microseconds. Is
> the microsecond part really unreliable (fake) ??
> How do I profile my code other wise ?
> Thanks in advance,
> MK
Try using these functions. This was provided by an earlier thread in
the mailing list.
This was provided by srinivas.
static unsigned int ms = 0;
static struct timeval start_tm,cur_tm;
do_gettimeofday(&start_tm);
ms = (cur_tm.tv_sec*1000000+cur_tm.tv_usec)-
(start_tm.tv_sec*1000000+start_tm.tv_usec) + 1;
printk("%10ld.%3ld ms",ms/1000, ms%1000);
Call the system call
do_gettimeofday( &cur_tm );
ms = (cur_tm.tv_sec*1000000+cur_tm.tv_usec)-
(start_tm.tv_sec*1000000+start_tm.tv_usec) + 1;
printk("%10ld.%3ld ms",ms/1000, ms%1000);
I hope this will wok out for you, also you might require to make some
changes depending upon your exact requirement !
--
Cheers,
Sandeep
A man with one watch knows what time it is; a man with two watches is
never quite sure.
--
Kernelnewbies: Help each other learn about the Linux kernel.
Archive: http://mail.nl.linux.org/kernelnewbies/
FAQ: http://kernelnewbies.org/faq/
