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<== Date ==> <== Thread ==>

Subject: Re: Consequences of the leap-second
From: Sean Murray <murray@tlabs.ac.za>
To: tech-talk@aps.anl.gov
Date: Mon, 02 Jul 2012 18:18:42 +0200
Hi

It seems that all the RHEL6 systems at APS that were running any kind of a JVM
have been pegging a CPU, and even Firefox is eating up 100% of a CPU on my box
despite restarting the program.  An OS reboot apparently fixes the problem,
but if you have any kind of OS support contract you might want to check with
them first since they might have a less drastic fix available.

Slightly less drastic would be to set the date:
/etc/init.d/ntp stop
date -s "`date`"
/etc/init.d/ntp start

Cheers
Sean


Time on some of our vxWorks IOCs (those that get their time from our Master
Timing IOC either through the event system or from the time broadcasts) is
currently running 1 second ahead of NTP time.  I suspect that this will not
correct itself until we reboot the Master Timing IOC, and then we'll need to
be prepared for worse things to happen:

iocrfcavs37> generalTimeReport 2
Backwards time errors prevented 821232 times.

Current Time Providers:
     "APS Event Receiver", priority = 70
         Current Time is 2012-07-02 11:34:02.450920.
     "APS Time Broadcast", priority = 75
         Current Time is 2012-07-02 11:34:02.458920.
     "NTP", priority = 100
         Current Time is 2012-07-02 11:34:01.446454.
     "OS Clock", priority = 999
         Current Time is 2012-07-02 11:34:02.449253.

Event Time Providers:
     "APS Event Receiver", priority = 70

value = 0 = 0x0

iocvidcentral> generalTimeReport 2
Backwards time errors prevented 2574916 times.

Current Time Providers:
     "APS Time Broadcast", priority = 75
         Current Time is 2012-07-02 11:39:31.579253.
     "NTP", priority = 100
         Current Time is 2012-07-02 11:39:30.567739.
     "OS Clock", priority = 999
         Current Time is 2012-07-02 11:39:31.580253.

Event Time Providers:
         No Providers registered.
value = 0 = 0x0


- Andrew




References:
Consequences of the leap-second Andrew Johnson

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