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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


  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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