Re: [time-nuts] IEEE Spectrum Magazine interviews one of our own...

[ehydra]

That is the solution:
http://xkcd.com/162/

- Henry


--
ehydra.dyndns.info


Tom Van Baak schrieb:

Hi Christopher,

Thanks for those interesting links.

Note PHK's original ACM article is:

The recent IEEE mention is:
 


With audio:
 


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Re: [time-nuts] IEEE Spectrum Magazine interviews one of our own...

[Tom Van Baak]

Hi Christopher,

Thanks for those interesting links.

Note PHK's original ACM article is:

The recent IEEE mention is:

With audio:


For those of you very interested in leap seconds please read the archives and post your contributions to the "LEAPSECS" 
list instead of the "time-nuts" list. It's not that leap seconds aren't part of the precision time world; rather, leap 
seconds are so interesting (to me at least) that we maintain a separate list for that topic.


Thanks,
/tvb
www.LeapSecond.com
www.LeapSecond.com/time-nuts
http://six.pairlist.net/mailman/listinfo/leapsecs


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Re: [time-nuts] IEEE Spectrum Magazine interviews one of our own...

[Christopher Quarksnow]

About Steven Cherry, here is a famous example of system outage due to leap
seconds :
http://www.dba-oracle.com/oracle_news/news_leap_second_causing_new_years_rac_node_crashes.htm

Also Google Android is plagued with an issue visible on phones like the
Motorola Droid or HTC EVO 4G, where the time displayed is GPS instead of
UTC, as possibly someone did not know of leap seconds :
http://code.google.com/p/android/issues/detail?id=5485

Concerning leap seconds, I spoke to Dr Daniel Gambis last month (he is the
one who decides to insert them), and he suggested that despite astronomers
having to incur costly retooling, it seems to him that ITU under U.S.
pressure might do away with leap seconds soon. He pointed me to the
following article :
www.agi.com/downloads/resources/user-resources/downloads/whitepapers/DebateOverUTCandLeapSeconds.pdf

As far as leap years every 4 years, that does not apply to multiples of 400
like year 2000.

Just my 2¢

Christopher Quarksnow



On Wed, May 25, 2011 at 02:30, cook michael  wrote:

> Le 25/05/2011 04:00, Tom Holmes a écrit :
>
> 
> Steven Cherry is exaggerating when he says " most systems go down for
> planned maintenance instead of trying to deal with leap seconds in real
> time."
>  As someone who has been supporting major industrial, banking, airline
> systems for the last 30 years, I remember NO down time, or outage due to
> leap second insertion. In fact, I don't know of any  commercial
> applications, that care about it. Most systems administrators that I had
> contact with didn't know that th leap seconds existed, and did not
> configure, check or update their ntp servers  to enable them to be taken
> into account.  There were of course outages and errors due to clock updates,
> but they were all attributable to operators trying to change the clocks by
> large increments manualy or bad ntp configurations, such as allowing large
> step changes instead of slewing .  We have up till now been faced only with
> positive leap second insertion, but negative updates are also possible.
> Testing I have done on unix based operating systems show no adverse effects
> to negative leap second insertion either.
>
>
>
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Re: [time-nuts] IEEE Spectrum Magazine interviews one of our own...

[Poul-Henning Kamp]

In message <4ddca21f.2060...@sfr.fr>, cook michael writes:

>   As someone who has been supporting major industrial, banking, airline 
>systems for the last 30 years, I remember NO down time, or outage due to 
>leap second insertion. 

Only the last five years really matter, because tightly time-synchronized
systems only spread in the last approx ten years, and the first
leap second after that happened was five years ago.

This is a problem that will only get worse as more and more systems
are modernized.

Poul-Henning

-- 
Poul-Henning Kamp   | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer   | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.

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Re: [time-nuts] IEEE Spectrum Magazine interviews one of our own...

[cook michael]

Le 25/05/2011 04:00, Tom Holmes a écrit :


Steven Cherry is exaggerating when he says " most systems go down for 
planned maintenance instead of trying to deal with leap seconds in real 
time."
  As someone who has been supporting major industrial, banking, airline 
systems for the last 30 years, I remember NO down time, or outage due to 
leap second insertion. In fact, I don't know of any  commercial 
applications, that care about it. Most systems administrators that I had 
contact with didn't know that th leap seconds existed, and did not 
configure, check or update their ntp servers  to enable them to be taken 
into account.  There were of course outages and errors due to clock 
updates, but they were all attributable to operators trying to change 
the clocks by large increments manualy or bad ntp configurations, such 
as allowing large step changes instead of slewing .  We have up till now 
been faced only with positive leap second insertion, but negative 
updates are also possible. Testing I have done on unix based operating 
systems show no adverse effects to negative leap second insertion either.



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Re: [time-nuts] IEEE Spectrum Magazine interviews one of our own...

[Rex]

Let's see if my mail client wraps the looong link too...

http://spectrum.ieee.org/podcast/at-work/innovation/does-anybody-really-know-what-time-it-is/?utm_source=techalert&utm_medium=email&utm_campaign=051911

I was expecting a video, but it's still nice as an mp3


On 5/24/2011 7:00 PM, Tom Holmes wrote:


  Podcast: When Will We Get Serious About the Leap Second?

We all go along with the agreement to add a 366th day to the calendar every
fourth year. But few people outside of computer scientists and managers of
computer chip foundries-whose operation depends on fraction-of-a-second
precision-have even heard of the leap second. Host Steven Cherry talks with
Poul-Henning Kamp, an independent software developer who maintains the
principal network time servers for his home nation of Denmark. Among the
many questions Kamp addresses is why a standard way of dealing with this
tiny but crucial adjustment in time has yet to be enacted.



Tom Holmes, N8ZM

Tipp City, OH

EM79



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[time-nuts] IEEE Spectrum Magazine interviews one of our own...

[Tom Holmes]

 
 Podcast: When Will We Get Serious About the Leap Second?

We all go along with the agreement to add a 366th day to the calendar every
fourth year. But few people outside of computer scientists and managers of
computer chip foundries-whose operation depends on fraction-of-a-second
precision-have even heard of the leap second. Host Steven Cherry talks with
Poul-Henning Kamp, an independent software developer who maintains the
principal network time servers for his home nation of Denmark. Among the
many questions Kamp addresses is why a standard way of dealing with this
tiny but crucial adjustment in time has yet to be enacted.

 

Tom Holmes, N8ZM

Tipp City, OH

EM79

 

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