Les Mikesell wrote: > 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. Ah, the system was fine, it was java that failed. And we've got a few tomcat apps... but IIRC, we fixed them the next day - we're "tier 3", and so "not critical", and could do that. mark