Re: gettimeofday(), clock_gettime(), timer_gettime()

On 7/25/06, John Richard Moser <[email protected]> wrote:

I'm looking through a few things and noticing some complaints about time
and performance.  Briefly, the following things have come to my attention:

 - gettimeofday() is slow, or so they say, needing several milliseconds
to execute.


No. At worse its several microseconds (PIT takes about 18us, and its terrible!).
More likely you'll see ~1us using ACPI PM or HPET or ~500-100ns
(depending on your system).  With vsyscall it can get into the sub
100ns range.

thanks
-john
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References:
- gettimeofday(), clock_gettime(), timer_gettime()
  - From: John Richard Moser <[email protected]>

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