Insertion of a leap second for test purposes
Hello I would be grateful if you could help me with this question. I would like, for test purposes, to be able to simulate the introduction of a leap second into UTC, as managed by NTP. I do not care whether or not this is a real historical leap second (which would involve setting my computers' times to an appropriate past date) or an imaginary leap second at the current date. I also do not care about the quality of my time - I am happy for my tests to be driven by a server's undisciplined local clock (unless this prevents ntpd from synchronising properly). What I care about is the insertion of the extra second. I plan to have a single NTP server, with several clients on which I will actually perform tests. I would like, by manual intervention, to ask the server to insert a leap second. I think this must be possible because I imagine people having to do this when a leap second occurs but their time source does not provide this information. I could not find a simple explanation in the documents of how to do this. My best guess has been to use ntpq, and type: writevar 42956 leap=01 (42956 is the association ID of the undisciplined local clock). This has failed because of authentication problems (which I have not yet overcome), so I have no idea whether or not this would have produced the intended result. I would be grateful for any help you can give. Thanks in advance Tom Cowell --- Posted via news://freenews.netfront.net Complaints to news@netfront.net
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Tom
7/9/2003 8:59:55 AM
comp.protocols.time.ntp
4895 articles. 
2 followers.
6 Replies
3328 Views
> I would suggest to use shared memory driver (SHM, ntp/html/driver28.html) > on primary server. You can write several lines of C code to simulate > leap second as it comes from reference clock and then trace both your > server and clients as they react. Thanks for this suggestion. I guess this would amount to my C programme actually being the clock. I anticipate a problem here, in that the C programme would loop, updating the information in shared memory and sleeping (using gettimeofday() and select()/usleep()). It seems to me that this approach would be susceptible to the shift in the system clock interfering with the timing of my programme. I'm also worried about the time_t, which has an ambiguous meaning during the leap second. However, I'll give it a go. I have also considered using another computer as the source of a time signal, perhaps sending an ASCII string for consumption by the parse driver (via a serial line, perhaps). Something tells me it should be easier than that. > As leap seconds can occur only in two moments in a year, I guess you > should set system clock to about 31 Dec 23:45:00, start ntpd on server > and clients, and feed leap second via bogus SHM driver. Indeed. Although it seems to me that NTP would accept a leap second at midnight on any arbitrary day, I think I will keep things simple and stick to proper leap second times. Tom --- Posted via news://freenews.netfront.net Complaints to news@netfront.net
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Tom
7/10/2003 1:03:37 PM
In article <bejo7b$2a7q$1@adenine.netfront.net>, Tom Cowell wrote: >I anticipate a problem here, in that the C >programme would loop, updating the information in shared memory and sleeping >(using gettimeofday() and select()/usleep()). It seems to me that this >approach would be susceptible to the shift in the system clock interfering >with the timing of my programme. I'm also worried about the time_t, which >has an ambiguous meaning during the leap second. However, I'll give it a go. try to use setitimer() and increment "internal" SHM generator timescale on every handled signal -- this should not rely on OS time scale. >I have also considered using another computer as the source of a time >signal, perhaps sending an ASCII string for consumption by the parse driver >(via a serial line, perhaps). Something tells me it should be easier than >that. If you already have a RS232 cable, of course. I have once written driver 29 (trimble palisade) timestamps generator, which works fine for me, can send on e-mail. -- Piotr Trojanek
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ptrojane
7/10/2003 2:13:07 PM
Piotr Trojanek suggested: >> As leap seconds can occur only in two moments in a year, I guess you >> should set system clock to about 31 Dec 23:45:00, start ntpd on server >> and clients, and feed leap second via bogus SHM driver. Tom Cowell replies: > Indeed. Although it seems to me that NTP would accept a leap second at > midnight on any arbitrary day, I think I will keep things simple and > stick to proper leap second times. The current UTC standard permits leap seconds at the end of any month, not just June and December. See http://iraf.noao.edu/~seaman/leap for a discussion regarding possible changes to the UTC standard. Steve Allen of Lick Observatory has an excellent leap second bibliography at: http://www.ucolick.org/~sla/leapsecs/onlinebib.html BTW - the idea to insert a test leap second is commendable. One has to believe that the only reason leap seconds might be considered problematic is that few engineers and programmers have taken this obvious precaution. Rob Seaman National Optical Astronomy Observatory
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seaman
7/11/2003 12:18:35 AM
Tom, Assuming your have the kernel modifications in Solaris, Tru64, FreeBSD or Linux, use the ntptime program to set the kernel leap bits in the machine with the local clock driver. Tell us if it works. Dave Tom Cowell wrote: > Hello > > I would be grateful if you could help me with this question. I would like, > for test purposes, to be able to simulate the introduction of a leap second > into UTC, as managed by NTP. > > I do not care whether or not this is a real historical leap second (which > would involve setting my computers' times to an appropriate past date) or an > imaginary leap second at the current date. I also do not care about the > quality of my time - I am happy for my tests to be driven by a server's > undisciplined local clock (unless this prevents ntpd from synchronising > properly). What I care about is the insertion of the extra second. > > I plan to have a single NTP server, with several clients on which I will > actually perform tests. I would like, by manual intervention, to ask the > server to insert a leap second. > > I think this must be possible because I imagine people having to do this > when a leap second occurs but their time source does not provide this > information. I could not find a simple explanation in the documents of how > to do this. > > My best guess has been to use ntpq, and type: > > writevar 42956 leap=01 > > (42956 is the association ID of the undisciplined local clock). This has > failed because of authentication problems (which I have not yet overcome), > so I have no idea whether or not this would have produced the intended > result. > > I would be grateful for any help you can give. > > > Thanks in advance > > Tom Cowell > > > > --- > > Posted via news://freenews.netfront.net > > Complaints to news@netfront.net
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David
7/11/2003 3:08:13 AM
> Assuming your have the kernel modifications in Solaris, Tru64, FreeBSD > or Linux, use the ntptime program to set the kernel leap bits in the > machine with the local clock driver. Tell us if it works. There is an ntptime -l argument, but it seems not to be implemented. Could you please confirm that what I am doing is correct? 1) Use ntptime with no arguments, and note the value of "status" (in my case this is 0x1 (PLL)). 2) "OR" this value with STA_INS (0x0010). 3) Submit this new number with ntpdate thus: ntpdate -s 17 Am I going about this the right way? I am still experimenting to find out whether or not this actually has any effect, but it would be nice to know whether or not I'm barking up the wrong tree. Thanks Tom --- Posted via news://freenews.netfront.net Complaints to news@netfront.net
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Tom
7/11/2003 1:47:32 PM
Tom, It really gripes me to the max when folks tinker with the ntptime program behind my back. I see somebody tinkered with it since the last time I cleared out the weeds. There is no -l option; it has always been the -s option. When that program left my hands it had no help information other than the NTP documentation, which is correct. The help information is wrong. And, the argument is in DECIMAL. Not my choice at all. Take the status bits as found, OR in the leap bits, convert to decimal and to the -s thing. Tom Cowell wrote: >>Assuming your have the kernel modifications in Solaris, Tru64, FreeBSD >>or Linux, use the ntptime program to set the kernel leap bits in the >>machine with the local clock driver. Tell us if it works. > > > There is an ntptime -l argument, but it seems not to be implemented. Could > you please confirm that what I am doing is correct? > > 1) Use ntptime with no arguments, and note the value of "status" (in my case > this is 0x1 (PLL)). > 2) "OR" this value with STA_INS (0x0010). > 3) Submit this new number with ntpdate thus: > > ntpdate -s 17 > > Am I going about this the right way? I am still experimenting to find out > whether or not this actually has any effect, but it would be nice to know > whether or not I'm barking up the wrong tree. > > Thanks > Tom > > > > --- > > Posted via news://freenews.netfront.net > > Complaints to news@netfront.net
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David
7/11/2003 6:16:52 PM
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Hello, I have a question about leap indicator. I need to do some tests with ntpd and I want to have NTP packets set Leap indicator in order to insert a leap second to a Linux server running ntp client. How can I configure the server to generate a packet with Leap indicator 0x01? Thanks in advance. I got the syntax of ntpq is as follows Syntax ntpq [ -i ] [ -n ] [ -p ] [ -c SubCommand ] [ Host ... ] Leap Indicator (LI) Code warning of impending leap-second to be inserted at the end of the last day of the current month. Bits are coded as follows: 00 no warnin...
question on leap second insertion in syslog
Hello to the great brainy(s) out there.. Quick question about the logging of leap second in the syslog... we have few number of Linux boxes, last year December 2008 23:59:59 when there was a leap second inserted, all the systems reported "Clock: inserting leap second..." But in our local testing for leap second inserting we noticed that the syslog reported "discipline status change 0010" at times "discipline status change 0011" Can someone please explain me the difference here? I understand there are no issues, but for documenting purpose I need the information...
Network Time Protocol (NTP) for NonStop
Has anyone used ntp on NonStop? HP has ported this for the OSS target. I know Bowden systems sells NSK-NTP, but I am wondering if anyone has used the open-source version. Thanks in advance. NonStopForEver wrote: > Has anyone used ntp on NonStop? HP has ported this for the OSS target. > I know Bowden systems sells NSK-NTP, but I am wondering if anyone has > used the open-source version. > > Thanks in advance. We use a product written by a german guy. It only acts as a client but does the job. If you wany some details then PM me. Hi Mark. Is this the C code that gets...
Ignore leap second announcement on NTP
Hello, Is there any proper way to configure ntpd in order to ignore leap second announcements from remote NTP servers? I have tried configuring leapfile/ntpkey_leap features in order to use local configuration, but if the remote NTP server announces a leap second it's forwarded to the client, and that's what I want to avoid. Santi Saez On Tue, Aug 21, 2012 at 10:34 UTC, Santi Saez <santi@woop.es> wrote: > Is there any proper way to configure ntpd in order to ignore leap second > announcements from remote NTP servers? > > I have tried configuring l...
NTP ( Network Time protocol ) With Ingres
Does somebody use NTP ( ntpdate or xntpd ) with Ingres. Officialy NTP is not compatible with Ingres. Thanks. Bruno. At 11:34 AM 7/18/2003 +0200, Bruno Wipier wrote: >Does somebody use NTP ( ntpdate or xntpd ) with Ingres. Officialy NTP is not >compatible with Ingres. > >Thanks. > >Bruno. Bruno, I guess I'm a bit flustered. Is there some list of UNIX utilities that are or are not "compatible" with Ingres? NTP merely keeps your clock in sync, usually within milliseconds of the 'master'. Is Ingres not compatible with the correct time? ;-) Or are you running Ingres 6.4 and you are manually dealing with Day Light Savings Time? In that case, you might be fudging with the system clock and/or time zone. I wouldn't run NTP in that case, unless you learn to configure it to your rules. By the way, DLST is evil. Where, pray tell, is this "official" non-compatibility posted? Cheers, Michael Leo mleo@cariboulake.com Java, J2EE, .NET Caribou Lake Software http://www.cariboulake.com Oracle, Ingres, So much style without substance, so much stuff without style. It's hard to recognize the real thing. It comes along once in a while. - Grand Designs, Power Windows, Rush ...
M$Windows and ntp (and other time protocols)
Looking for timeserv to sync a M$nt4 machine, I found this doucment at MicroSoft: http://www.microsoft.com/windows2000/docs/wintimeserv.doc. It nicely states (official?) details about M$Windows and time sync. Is there a faq or such where this pointer / information can be added? CBee CBee wrote: > Looking for timeserv to sync a M$nt4 machine, I found this doucment at > MicroSoft: http://www.microsoft.com/windows2000/docs/wintimeserv.doc. > It nicely states (official?) details about M$Windows and time sync. > > Is there a faq or such where this pointer / information can be...
Leap second test results under windows
Hi all, I've just updated our leap seconds info page at http://www.meinberg.de/english/info/leap-second.htm#log-ntp It now contains information I gathered using our "xmas edition" of ntpd for Windows. The page contains more information, and the graphs show a very good behaviour of the NTP service under Windows. Unfortunately there have been reports here on configurations where the time synchronization under Windows has been messed up. As far as I can see, and what I see from the logs that I've received, this is mostly due to the bad behaviour of the upstream servers. Ma...
NTP Leap Second on Windows XP
Others have reported large drift values. My driftfile has been steady around -70 for over a year, but as soon as the leap second approached, my values pegged at 500. They have been bouncing around since and today have climbed to -59 and still climbing slowly. See http://jerbaker.dhs.org/ntp/ As I understood, leap seconds means the time is adjusted instantly with one second. This has nothing to do with the drift file! Please see my responses on yesterday messages to see some graphs on FBSD and Win. As I observed until today, no Windows system changed the time correctly at 23:59:60UTC. Am ...
if time = 3 seconds, how do i set the values of the time steps 0,0.1,0.2,0.3,0.5,1.0,1.5,2.0,3.0,5.0 to -9999 from time =3 seconds
Hi I have 18 inputs (arrays) which contain certain statistics and if time = 3 seconds, set the values of time step 5.0 to -9999.0. I was wondering if there is an efficient way to do this without using a lot of case statements? Thank you. Hello AdrianT, it's not really clear to me what you want to do... I suspect: you have an array containing values and you want to output them with a fixed timing of 3 seconds: you should use a for loop autoindexing trough your array and sending the value to your indicator/output/whatever. Put a "wa...
Web resources about - Insertion of a leap second for test purposes - comp.protocols.time.ntp
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