On Sat, 26 Jul 2003, Guillaume Chazarain wrote:
> BTW, with your nanosecond resolution, mplayer is also max interactive.
good.
> Don't you find it strange to need a nanosecond resolution to evaluate a
> simple integer in a [-5, 5] range?
no, i dont find it strange, as the -5..5 integer range is only the end
result. What we really want is an accurate sleep average, the integral of
sleep times done over the last N seconds. Given that tasks can schedule at
very high frequencies these days, this needs accurate measurements. I used
to hope that a 1 msec sampling frequency would to be enough for this, but
when we fix the statistics cornercase you mention, another cornercase pops
up. And it's not _that_ hard to use the cycle counter and still have a
reasonably fast algorithm, anyway.
Ingo
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This archive was generated by hypermail 2b29 : Thu Jul 31 2003 - 22:00:31 EST