Re: [boost] Boost Timer Update

From: Philippe Vaucher (philippe.vaucher_at_[hidden])
Date: 2006-10-31 12:42:44

>
> Is that really the case?  Microsoft's own documentation states:
>
> "The default precision of the timeGetTime function can be five
> milliseconds or more, depending on the machine. You can use the
> timeBeginPeriod and timeEndPeriod functions to increase [snipped]

microsec_clock doens't use timeGetTime()... it uses GetSystemTime() if I
remember correctly.
QueryPerformanceCounter has indeed a better resolution than timeGetTime(),
it also has less overhead... but unfortunately I don't know how it compares
to GetSystemTime(). I will have to run some tests to determinate.

At the moment my code offers :

   -  microsec_timer, which uses boost::posix_time::microsec_clock which
   is itself based on GetSystemTime on windows and gettimeofday() on linux. I
   think that'd be the timer that most of the users should use.
    - second_timer, which uses boost::posix_time::second_clock, which I
   forgot what it was using.
   - qcp_timer, only available under windows, which uses
   QueryPerformanceCounter.
   - tgt_timer, only available under windows, which uses timeGetTime.

And then I plan to add clock_timer which would use std::clock... about
GetTickCount() I don't think it'd be worth adding it as it's the worse win32
timer that exists.

I'll give a shot to the nvidia timer test thing in the next days.

Philippe