Time Synchronization, Lookout 6.2

We recently installed 6.2 on several new machines, and one of the machines is experiencing issues with time synchronization. I have no time servers set up using the Time Synchronization Dialog, and the Lookout System Time (lower left corner) is unstable, and different from the Windows system clock. The Lookout time will sometimes fall two minutes behind the windows system clock, and then "update" to the correct time and immediately start lagging behind the system clock. Even though I have time servers set up, changing the "Sleep Time" in the Time Sync dialog affects the behavior of the lookout system time. I've tried add the local machine as the time server, and another computer running 6.2 as the time server, but this does not correct the issue. The lookout system time may change 2 seconds in 20 seconds, which makes all of our timers useless. Again, we're only experiencing this issue on on computer, and I've unistalled the software, all the way down to the WinXP OS, reinstalled, and the same behavior returns after the Lookout process is opened and run for about 5 minutes.
It appears as though there may be a time server set somewhere that is not showing in the time sync dialog. Is there a location in the registry where the time server might be shown? Any other suggestions will be most appreciated.
One last thing, once lookout is started, if I stop the NI Time Sync service, the lookout time matches the local comptuer time perfectly. I thought about disabling this service, but Lookout won't start without it. I have to stop it once Lookout is started, and I have a continuous alarm alerting that the service has been stopped.
Again, I'll appreciate any suggestions.
Jeff Miller
USACE

Hi Jeff, I am wondering if you found a solution to your issue. I have just replaced a PC running Lookout Client 6.2 (power supply died) and this machine is experiencing the same issue you describe (lookout time running wild)
This of course, causes the hyper trends to not 'sync/display'.

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Time synchronization in producer/consumer loop

I wanted to save data from producer loop once in 4 secs. But this is not possible due to the wait function in the producer loop. It saves data once in 5 secsonce in 4-5 loops. When I cancel the wait function, the loop uses CPU extremely high. How can I avoid this timing problem?
Egemen
Solved!
Go to Solution.
Attachments:
Producer-consumer to txt.png ‏106 KB

Yeah, actually I ran your code and got the issue...
You're using two timing functions (Wait ms and Elapsed Time) in the same loop runing on a non-real time system (that is Windows)... And as its not deterministic, this behaviour is expected...!!
However if you want to generate and log (the latest sample) at different rates.. you need to do it in different loops...
You may say that, you're alreayd doing this in different loops.. but in your implementation.. the execution of lower loop is still controlled by the Producer Loop.
I've made certain changes...
-> Replaced Queue with Notofier.
-> Now Elapsed Time is part of lower loop (Consumer Loop).
I am not allergic to Kudos, in fact I love Kudos.
Make your LabVIEW experience more CONVENIENT.
Attachments:
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How to configure time synchronization for two NTP servers

We have IOSXR 4.2.1 on routers CRS3 and ASR9K with all recomended SMUs; we need to configure the time synchronization for two NTP servers with the configuration below, but the routers became unstable; synchronize with one NTP servers for some time, then switch to other NTP server, and keep doing this. Anyone know why this behavior?
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RP/0/RP0/CPU0:Jul 4 21:29:18 : ntpd[256]: %IP-IP_NTP-5-HP_CONN_LOST : High priority NTP peer connection lost - Stratum 2->15.
RP/0/RP0/CPU0:Jul 4 21:29:18 : ntpd[256]: %IP-IP_NTP-5-ALL_CONN_LOST : All NTP peer connections failed.
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RP/0/RP0/CPU0:Jul 4 21:30:21 : ntpd[256]: %IP-IP_NTP-5-SYNC_LOSS : Synchronization lost : 10.192.32.32 : Peer unreachable or clock selection failed
RP/0/RP0/CPU0:Jul 4 21:30:21 : ntpd[256]: %IP-IP_NTP-5-HP_CONN_LOST : High priority NTP peer connection lost - Stratum 2->15.
RP/0/RP0/CPU0:Jul 4 21:30:21 : ntpd[256]: %IP-IP_NTP-5-ALL_CONN_LOST : All NTP peer connections failed.
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RP/0/RP0/CPU0:Jul 4 21:40:11 : ntpd[256]: %IP-IP_NTP-5-HP_CONN_RECOVERED : High priority NTP peer connection recovered - Stratum 15->2.
RP/0/RP0/CPU0:Jul 4 21:50:52 : ntpd[256]: %IP-IP_NTP-5-SYNC_LOSS : Synchronization lost : 10.192.32.33 : System clock selection failed
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RP/0/RP0/CPU0:Jul 4 21:59:26 : ntpd[256]: %IP-IP_NTP-5-HP_CONN_RECOVERED : High priority NTP peer connection recovered - Stratum 6->2.
RP/0/RP0/CPU0:Jul 4 22:25:07 : ntpd[256]: %IP-IP_NTP-5-SYNC_LOSS : Synchronization lost : 10.192.32.33 : System clock selection failed
RP/0/RP0/CPU0:Jul 4 22:25:07 : ntpd[256]: %IP-IP_NTP-5-HP_CONN_LOST : High priority NTP peer connection lost - Stratum 2->6.
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Hi Claudio, that ddts is pretty generic to be honest but yes it is filed to address sync issues in the XR NTP algo.
The thing is that XR ntp clock selection is a bit different then iOS and follows the specs very closely which results in this erroneous loss behavior.
For instance, you could also see this issue with a sync loss if the update time is only 500msec off what it was before and that will result in a ntp sync loss rather then adjusting to it.
Also I wanted to mention that the ntp prefer is a bit of a misnomer in XR (since it follows the specs differently then IOS) and this knob was taken over from IOS really.
You might get some joy if you set it to one server only and see if that helps?
regards
xander

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Time synchronization problem with "niUSRP EX Rx Multiple Synchronized Inputs.v i " ??

Hello,
I used "niUSRP EX Rx Multiple Synchronized Inputs.vi "( offred by NI) to synchronize 2 USRP in reception (the master connected to laptop via Ethernet and the slave connected to the master via MIMO cable).
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Hi,
I used:
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Cable 10MHz connects the master device with the transmitter.
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I must have 2 superposed sin [(ch0 I with ch1 I) (ch0 Q with ch1Q)] ?
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Time synchronization across nodes

Does coherence perform time synchronization across nodes in a cluster?
If so, does the synchronization affect time in the node's JVM?
We have a few machines in the cluster whose system clocks are off by several minutes (slow) and noticed entries in the member's logs with timestamps in the future!?

Hi John,
Coherence does not perform any clock synchronization though it is aware of the clock differences and factors it into some of the time based operations.
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Time Synchronization two PCs having LabVIEW's DSC

I have two PCs which have LabVIEW's DSC Run-Time System installed on them. They are connected on the LAN. The approximate distance between the two PCs is about 6 KM, i.e., it passes through many repeaters and network switches. Both fiber optic and normal network cable is used. The LAN speed is 10Mbps.
LVDSC Runtime System has an option of time synchronizing two or more PCs which are registered.
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Does the accuracy fall if the distance between the PCs on the LAN increases, i.e., the LAN speed could be slow at times due to net congestion ?
Does the time synchronization take place to the accuracy of "seconds" or "milli seconds" ?
Thanks

Hi,
The time synchronization service that ships with LabVIEW DSC is accurate to +-10 milliseconds in ideal conditions (two PCs on a LAN located on the same floor of the same building). The time synchronization service will attempt to compensate for any latency between the servers, but some accuracy will be lost. Accuracy should never be worse than +-1 second, and should be much better than that except in very high-latency situations.
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Time synchronization using SNTP

Hello all,
I my trying to set up SNTP synchronization of my cRIO to NTP server. To do that, I followed instructions in: http://digital.ni.com/public.nsf/allkb/F2B057C72B537EA2862572D100646D43
When I did reboot on my cRIO, time synchronization was successful. Then I changed the clock on cRIO manually to be 2 minutes ahead of that on NTP server. In this way I wanted to test the time synchronization, but nothing happened, i.e. after 30 minutes of waiting clock on the cRIO is still 2 minutes ahead (synchronization interval is set to 5 seconds).
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If synchronization is working well (i.e. it synchronizes 2 minutes ahead because of my manual intervention), how can I test that synchronization is working well during runtime?
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Marko.

UPDATE:
I did a test with 2 cRIO devices. Both of them are configured to synchronize with NTP server, and they synchronized successfully on reboot. Then I manually changed times on both of them (not long after reboot), where I set the first cRIO to be 20 seconds ahead NTP server time, and the second cRIO to be 20 seconds behind NTP server time. After 12 hours of runtime, times on both cRIO devices are still 20 seconds ahead/behind NTP server time. Time synchronization update interval was set to 10 seconds on both of them.
Now I'm confued how time synchronization works on cRIO devices. As I see it, there are two possibilites: (i) clocks were synchronized on reboot, and shortly after that I manually changed the clocks to be 20 seconds ahead/behind NTP server time - maybe cRIO now "thinks" that this is normal situation, i.e. to be 20 seconds ahead/behind; or (ii) NTP time synchronization works only on reboot.
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Best,
Marko.

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Hi Anthony,
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Time synchronization poorness caused to block connection

Dear Microsotf,
I have VDS windows 2008r2 + Sql Server 2008 Express Ed. I am running MuOnline Private server (online gaming). But my OS system time is delaying (7 Secounds Delaying every 15 minutes) Time is cyritical for online games. problem
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Simply use a public NTP server for time sync.
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This posting is provided AS IS with no warranties or guarantees , and confers no rights.
Ahmed MALEK
My Website Link
My Linkedin Profile
My MVP Profile

We want Cluster time synchronization service to point out time server

Currently we are using Cluster time synchronization service in our 11gr2 RAC test system, But for production system our Admin wants the system to get its time from our time servers, he wants all the servers in the company to have same time.we can fix this by using NTP service instead of Cluster time synchronization service .But Cluster time synchronization service has more advantages over NTP.
My Question, Is there any way that i make my Cluster time synchronization service to get time from our time servers ? In this way all my other nodes will also have same time as our time servers as they are referencing to first node, which is getting time from TIME SERVER

Hi ,
My Question, Is there any way that i make my Cluster time synchronization service to get time from our time servers ? In this way all my other nodes will also have same time as our time servers as they are referencing to first node, which is getting time from TIME SERVER
This is not possible
If you use NTP, then the Oracle Cluster Time Synchronization daemon (ctssd) starts up in observer mode.
For CTSS to be in active mode, a vendor time service must not be running, and must not be configured (correctly or otherwise).
This is important.
CTSS is conservative and will switch to OBSERVER mode the moment it discovers that a vendor service is running or configured on even one node in the cluster.
This is to prevent multiple active time sync services running on the cluster, potentially changing clocks.
Regards,
Levi Pereira
Please close your thread when you get the solution to your problem. 
Mark the replies answered "helpful" answer and/or "correct" answer that will help others with same problem. 
Thanks for doing your part to make this community as valuable as possible for everyone!

Ptp Synchronization on Windows

I am currently using software ptp synchronization to synchronize the time on several RT systems (PXI, cRIO, and RMC) I now need to sync a windows machine on the subnet. Is there a windows program that does ptp synchronization to an RT grandmaster?
Solved!
Go to Solution.

Hello Marcis-Andreis,
the PTP sotfware options for Windows machines are very limited.
As you can see here - http://www.endruntechnologies.com/ptp-slave.htm
Windows XP, 2003, VISTA, Windows 7 (PTPv2 only)
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The biggest problem is that Widows OS itself is non-deterministic, maybe you should consider using Linux where the options are better.
For Linux you can use popular PTPd package for example, plus you can go for PREEMPT RT, that make you Linux more deterministic.
But everything depends on your application
Please let me know if I can be helpful here.
Thanks and wish you good luck with your project.
Best regards,
David

Clock synchronization of a NI-6111 with a NI-6602

Hello,
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Thanks
Facundo

Hi facundo,
It appears that you're using DAQmx with the NI-6602 device, but the Traditional DAQ driver (since you're using the AI Clock Config VI) with NI-6111. Is this correct? If so, is there a reason why you're doing so since both boards support DAQmx?
Each device can use one driver at a time. If you're using AI Clock Config, and right click the "Clock Source" and choose Create >> Constant, you should be able to choose "RTSI Connection", and indicate the RTSI pin number. However, unless you have a specific reason, I would recommend using DAQmx for both boards. You can consider LabVIEW shipping examples such as "Multi-Device Synch-Analog Input-Cont Acquisition.vi" as a starting point.
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