[Boost-users] Re: date_time clocks, microsec_clock, etc

From: Jeff Flinn (TriumphSprint2000_at_[hidden])
Date: 2004-05-06 09:23:12

Aaron,

> "Aaron W. LaFramboise" <aaronrabiddog51_at_[hidden]> wrote in message
news:4099ED56.6010806_at_aaronwl.com...
>
[snip]
>
> Windows system time GetSystemTime()
>   Granularity: 100 nanoseconds
>   Precision: approximately 10 milliseconds
>     (Approximately 55ms on Windows 95/98/ME, 15ms on Windows NT 3.1.)
>     (Presently reported as 10.0144 milliseconds.)
>   Apparent precision: 0.010066666666666666 seconds
>   Apparent jitter: 0.00014285714285714287 seconds
>
> Windows system time in file time GetSystemTimeAsFileTime()
>   Granularity: 100 nanoseconds
>   Precision: Same as system time
>   Apparent precision: 0.0100144 seconds
>   Apparent jitter: 0 seconds

FYI see ::timeBeginPeriod / ::timeEndPeriod to get Precision down near 1ms
on WindowsNT/2K/XP. THis also affects ::Sleep.

-----------------
Jeff Flinn
Applied Dynamics, International