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Subject: Re: faster gettimeofday? Posted on: Mon, 08 Mar 2010 16:44:33 +1300

Sumer Cip wrote:
> Hi all,
>
> I am developing a profiler, and in my tests, it seems most of time
> spent in the profiler is the gettimeofday() function. I have also used
> clock_gettime() function and gives same results. Is there any way to
> optimize the below piece of code more? Maybe another syscall I am
> missing or anything?
>
> static long long
> tickcount(void)
> {
> struct timeval tv;
> long long rc;
> #ifdef GETTIMEOFDAY_NO_TZ
> gettimeofday(&tv);
> #else
> gettimeofday(&tv, (struct timezone *)NULL);
> #endif
> rc = tv.tv_sec;
> rc = rc * 1000000 + tv.tv_usec;
> return rc;
> }

It should be fast. On Solaris, gettimeofday() is a fairly thin wrapper
for gethrtime(). So if your system supports it (I think it is a POSIX
RT function), use that.

--
Ian Collins

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