On Fri, Mar 6, 2015 at 1:50 PM, <m.roth at 5-cent.us> wrote: >> >> I don't think I need to 'prove' that computer programs do repeatable >> things. I just want to know the version numbers that need to be >> installed - something relatively easy to check. > <snip> > Two other thoughts: first, that it worked perfectly fine the last leap > second, and second, that ntpd, according to the manpage, can and will > adjust for seconds of difference with no problem at all, since that's it's > job. Errr, no. It did _not_ work fine in the last leap second. If you run threaded applications (including, but not exclusively, java) or applications that called usleep the kernel would spin with 100% CPU use until you reset the date with some means other than ntp. How could you have missed that: http://www.wired.com/2012/07/leap-second-bug-wreaks-havoc-with-java-linux/. Every other sysadmin in the world got calls in the middle of the night to fix their servers. -- Les Mikesell lesmikesell at gmail.com