From: Emanuel Berg <embe8573@student.uu.se>
Subject: Re: how to analyze clock drift
Date: Wed, 19 Nov 2014 03:37:21 +0100
Date: 2014-11-19T03:37:21+01:00 [thread overview]
Message-ID: <87a93n531a.fsf@debian.uxu> (raw)
In-Reply-To: m4gu6r$mpt$1@dont-email.me
Simon Clubley
<clubley@remove_me.eisner.decus.org-Earth.UFP> writes:
>> I have a long list of samples of clock readings. It
>> "should" be periodical, by 1 ms, but of course it
>> isn't. The data is in nanoseconds.
>>
>
> How are you gathering the data?
There is a C++ program. It uses the sleep_until
function to control the "1 ms" period. Then time is
dumped using other C++ methods.
No, the isn't the correct time. That is the whole
idea. It isn't correct, but in what ways is it
incorrect - does it drift? does it average out? does
it drift but evenly, i.e. the drift doesn't drift?
etc.
I want to answer such questions (and others) if
possible with math/stat methods and a large set of
data, but I'm not a star in science, I do tool
programming, so I thought you can help me, and I can
program, and it'll be interesting... :)
Here is everything - including docs, even a man page:
http://user.it.uu.se/~embe8573/hs-linux/
--
underground experts united
next prev parent reply other threads:[~2014-11-19 2:37 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-18 22:12 how to analyze clock drift Emanuel Berg
2014-11-19 1:41 ` tmoran
2014-11-19 2:10 ` Emanuel Berg
2014-11-19 10:30 ` Jacob Sparre Andersen
2014-11-19 22:15 ` Emanuel Berg
2014-11-20 16:27 ` Stephen Leake
2014-11-20 1:10 ` Emanuel Berg
2014-11-20 14:11 ` Dennis Lee Bieber
2014-11-19 13:08 ` Brian Drummond
2014-11-19 2:10 ` Simon Clubley
2014-11-19 2:37 ` Emanuel Berg [this message]
2014-11-19 2:28 ` Dennis Lee Bieber
2014-11-19 2:44 ` tmoran
2014-11-19 2:51 ` Emanuel Berg
2014-11-19 9:01 ` Dmitry A. Kazakov
2014-11-19 22:12 ` Emanuel Berg
2014-11-20 9:42 ` Dmitry A. Kazakov
2014-11-20 20:41 ` Emanuel Berg
2014-11-20 21:27 ` Dmitry A. Kazakov
2014-11-20 21:54 ` Emanuel Berg
2014-11-20 21:57 ` Emanuel Berg
2014-11-21 2:27 ` Dennis Lee Bieber
2014-11-21 3:02 ` Emanuel Berg
2014-11-21 16:49 ` Dennis Lee Bieber
2014-11-21 21:06 ` Emanuel Berg
2014-11-22 18:18 ` Dennis Lee Bieber
2014-11-23 20:15 ` Emanuel Berg
2014-11-24 1:15 ` Dennis Lee Bieber
2014-11-24 1:34 ` Emanuel Berg
2014-11-24 9:22 ` Jacob Sparre Andersen
2014-11-24 17:30 ` Dennis Lee Bieber
2014-11-24 8:44 ` Dmitry A. Kazakov
2014-11-24 17:24 ` Dennis Lee Bieber
2014-11-24 18:28 ` Dmitry A. Kazakov
2014-11-24 20:30 ` brbarkstrom
2014-11-24 21:03 ` Dmitry A. Kazakov
2014-11-24 21:34 ` brbarkstrom
2014-11-25 14:04 ` brbarkstrom
2014-11-25 18:16 ` Dennis Lee Bieber
2014-11-25 20:50 ` brbarkstrom
2014-11-21 21:15 ` Emanuel Berg
2014-11-21 22:31 ` Emanuel Berg
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