Groups > comp.lang.java.programmer > #37489

Re: Is time an illusion?

Newsgroups	comp.lang.java.programmer
Date	2017-09-27 05:25 -0700
References	(1 earlier) <oqbud2$h8k$1@dont-email.me> <oqbv8t$mp1$1@dont-email.me> <oqea94$tu8$1@dont-email.me> <oqemvu$m1f$1@dont-email.me> <oqet7m$m6m$1@jstuckle.eternal-september.org>
Message-ID	<4e8d7b7f-b9ec-4fb7-b8d3-a8961b74c4c1@googlegroups.com> (permalink)
Subject	Re: Is time an illusion?
From	Eric Douglas <e.d.programmer@gmail.com>

Show all headers | View raw

On Tuesday, September 26, 2017 at 9:01:03 PM UTC-4, Jerry Stuckle wrote:

> At the end of a week, check the time against the internet (or 
> synchronize it, paying attention to how much the adjustment is).  You 
> will find a difference of at least several seconds, and possibly as much 
> as a couple of minutes.

The difference primarily depends on the quality and the age of the hardware.  We once had a PC in the office that wasn't syncing time all day long that was off by 5 minutes or more by the end of a day if we set it correct first thing in the morning.  I find that a 5 year old PC doesn't seem to run as fast as when it was new even with a clean reformat (though formatting should help).

I always wonder how accurately you can sync a machine.  Just going to another machine on the same network depends on the speed of their network cards and cables and switches.  Going out to the internet adds a lot more variables, which is why estimates of time for downloading files tend to vary widely.  The first thing you want to do is connect as smoothly as possible.  If processes have to run on different machines, do they have to go through a switch or can they connect directly?  Can you use 10 gigabit?

One possible workaround is to timestamp.  If each machine can just march to it's own beat and note where those beats are they can be adjusted.  If the full recording on one machine comes out 5 minutes longer than the other, can you just squish it after the fact to match?

Thread

Is time an illusion? Daniele Futtorovic <da.futt.news@laposte.net> - 2017-09-25 22:30 +0200
  Re: Is time an illusion? Eric Sosman <esosman@comcast-dot-net.invalid> - 2017-09-25 18:02 -0400
    Re: Is time an illusion? Daniele Futtorovic <da.futt.news@laposte.net> - 2017-09-26 00:16 +0200
      Re: Is time an illusion? Jerry Stuckle <jstucklex@attglobal.net> - 2017-09-25 19:18 -0400
      Re: Is time an illusion? Eric Sosman <esosman@comcast-dot-net.invalid> - 2017-09-26 15:37 -0400
        Re: Is time an illusion? Daniele Futtorovic <da.futt.news@laposte.net> - 2017-09-27 01:13 +0200
          Re: Is time an illusion? Jerry Stuckle <jstucklex@attglobal.net> - 2017-09-26 21:00 -0400
            Re: Is time an illusion? Daniele Futtorovic <da.futt.news@laposte.net> - 2017-09-27 04:26 +0200
              Re: Is time an illusion? Jerry Stuckle <jstucklex@attglobal.net> - 2017-09-26 23:32 -0400
                Re: Is time an illusion? Daniele Futtorovic <da.futt.news@laposte.net> - 2017-09-28 10:58 +0200
                Re: Is time an illusion? Jerry Stuckle <jstucklex@attglobal.net> - 2017-09-28 12:50 -0400
            Re: Is time an illusion? Eric Douglas <e.d.programmer@gmail.com> - 2017-09-27 05:25 -0700
            Re: Is time an illusion? Arne Vajhøj <arne@vajhoej.dk> - 2017-09-30 22:57 -0400
  Re: Is time an illusion? Arne Vajhøj <arne@vajhoej.dk> - 2017-09-25 20:22 -0400
  Re: Is time an illusion? Marcel Mueller <news.5.maazl@spamgourmet.org> - 2017-09-26 20:18 +0200
    Re: Is time an illusion? Daniele Futtorovic <da.futt.news@laposte.net> - 2017-09-27 01:30 +0200
      Re: Is time an illusion? lewbloch@gmail.com - 2017-09-28 10:52 -0700
  Re: Is time an illusion? Eric Douglas <e.d.programmer@gmail.com> - 2017-09-26 12:59 -0700
    Re: Is time an illusion? Daniele Futtorovic <da.futt.news@laposte.net> - 2017-09-27 01:42 +0200
  Re: Is time an illusion? lewbloch@gmail.com - 2017-09-28 10:49 -0700
    Re: Is time an illusion? Robert Klemme <shortcutter@googlemail.com> - 2017-09-28 22:33 +0200

csiph-web