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

6 May 2004


      Aaron,
...
"Aaron W. LaFramboise"  wrote in message
news:4099ED56.6010806@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