[Beowulf] ...Re: Benchmark results
josip at lanl.gov
Thu Jan 8 18:33:28 EST 2004
Andrew Piskorski wrote:
> Would DJB's clockspeed, taiclock, etc. stuff be any better than ntp
> for that?
Interestingly enough, DJB says that after he applied clockspeed
compensation, his machine drifted only 0.21 seconds in three months.
This would imply long term clock stability of about 0.027 ppm, but as
Jim already pointed out, short term stability usually isn't as good.
Using the random walk assumption, DJB's clock could drift 75
microseconds in either direction each second (at random), and still meet
these long term stability results... While full NTP may be too much,
some NTP-like approach is probably needed...
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