Re: [AD] Add timeBeginPeriod(1) to wtimer.c

["Tobias Scheuer" <tobing@xxxxxxxxxx>]

> 
> On my winXP athlon64 3000+ machine.
> setting the timeBeginPeriod(1) once globally  results in much better 
> performance.  possibly due to better timing.
> 
> aj.

For the global setting it might be woth considering giving install_timer() a
new parameter of type int, specifying the timer resolution to use. That way
it yould be up to the programmer how üprecise things would be, and it would
be configurable, maybe dependant on the CPU speed. Or however. 

> 
> 
> 
> 
> Chris wrote:
> > Elias Pschernig wrote:
> > 
> >> Not sure how high the cost would be, even in case it would work like I
> >> think. I only know the linux scheduler has 10ms tickss, and uses every
> >> 2nd tick to do scheduling (or something like that, didn't pay enough
> >> attention in lectures :P) - and there must be a reason they don't use
> >> 1ms ticks.
> > 
> > 
> > I believe there's a kernel option to change the frequency of the timer. 
> > At least, I remember seeing one in an older (pre-2.4.28) version. 2.4.28
> > does, however, have a Low-latency scheduler option (which is off by 
> > default).. I haven't been able to test it, though.
> > 
> > But on my old 400MHz machine, I remember changing the timer option from 
> > 100 to 1000, and my system became almost unuseable because it was so 
> > unrepsonsive. I fear the same thing is happening with 
> > timeBeginPeriod(1). Faster CPU's may not show as much speed defficiency 
> > (and perhaps at some point, it'll become more efficient), but I don't 
> > think current CPUs are ready for it, hence why the scheduler is still 
> > 10ms by default.
> > 
> > 
> > -------------------------------------------------------
> > SF email is sponsored by - The IT Product Guide
> > Read honest & candid reviews on hundreds of IT Products from real users.
> > Discover which products truly live up to the hype. Start reading now.
> > http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click
> 
> 
> 
> -------------------------------------------------------
> SF email is sponsored by - The IT Product Guide
> Read honest & candid reviews on hundreds of IT Products from real users.
> Discover which products truly live up to the hype. Start reading now.
> http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click
> -- 
> https://lists.sourceforge.net/lists/listinfo/alleg-developers
>