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  • Snow Leopard Halloween "Trick:" SystemUIServer >90% CPU Reported


    If you were, like me, using your Mac late on Hallowe'en night, you may have noticed your fan kick in at about the time the clock did its "fall back" from Daylight Savings Time. Many users did, and lit up Apple's Support boards for the hour until it was finally 1:59:59 again in their particular time zone, when most everybody's fans quieted down. Users noticed that the SystemUIServer process took up from 90 - 100% CPU usage, with some reporting launchd and syslogd also stressing the processor.

    A workaround was discovered, which was simply to turn the menu bar clock off momentarily. However, since the high usage level generally went away at 2am, with the overwhelming majority of users probably having missed the whole event, the workaround was unneeded for most.

    One helpful user in the threads did a sample in Activity Monitor and noted "CFAbsoluteTimeAddGregorianUnits" coming up frequently in SystemUIServer. There was disagreement over whether the bug was an understandable oversight or sloppy programming. The problem does, however, seem to have come and gone. Anyone seen any lasting effects?
    This article was originally published in forum thread: Snow Leopard Halloween "Trick:" SystemUIServer >90% CPU Reported started by Paul Daniel Ash View original post
    Comments 17 Comments
    1. xxfr0stbytexx's Avatar
      xxfr0stbytexx -
      haha nice. that doesnt happen on windows
    1. ultimatexpka's Avatar
      ultimatexpka -
      im a pc, and your a mac...
    1. plcrules's Avatar
      plcrules -
      o and if ur mac went 2 sleep at 2 am the cpu would b stressed all night
      it happened 2 me
    1. subalou1's Avatar
      subalou1 -
      happened to me, the right side was at 90% so I shut it down.
    1. rhekt's Avatar
      rhekt -
      had my macpro turned off for the first time in 3 weeks...just didnt feel like using it so i surfed on my iphone. dodged a bullet i guess...[err rubber bullet]
    1. billchase2's Avatar
      billchase2 -
      I had both of my Macs on but didn't notice anything. Though I wasn't using the one at the time and was watching a movie on the other.
    1. StealthBravo's Avatar
      StealthBravo -
      Quote Originally Posted by xxfr0stbytexx View Post
      haha nice. that doesnt happen on windows
      yea instead of locking up once a year, windows locks up several times a day
    1. zwaldowski's Avatar
      zwaldowski -
      I was wondering what the hell was going on. For the record, MPlayer OS X Extended handles screwed-up SystemUIServer CPU sucking better than VLC does.

      Now, even though I'm hopelessly devoted to OS X, this brings up a question: can we as a technological society STILL not manage time switching properly on computers? That'd be like having a 2K10 problem, ridiculous!
    1. rwin84's Avatar
      rwin84 -
      very weird...
    1. GmAz's Avatar
      GmAz -
      Quote Originally Posted by StealthBravo View Post
      yea instead of locking up once a year, windows locks up several times a day
      maybe you should stop running windows me. I haven't had a lockup in windows in years.

      And guess it goes to show that even changing the clock for dst is a hard job for mac os.
    1. prism2unit's Avatar
      prism2unit -
      Quote Originally Posted by GmAz View Post
      maybe you should stop running windows me. I haven't had a lockup in windows in years.

      And guess it goes to show that even changing the clock for dst is a hard job for mac os.
      If your PC hasn't locked up in years, YOU'RE DOING IT WRONG!

      (P.S. i have a pc.)
    1. Silv3r's Avatar
      Silv3r -
      my pc hasnt locked up in years.. oh wait ever since i got a gf and stopped watching the virus giving videos on the internet.... hahahahaa
    1. djnikk's Avatar
      djnikk -
      Quote Originally Posted by Silv3r View Post
      my pc hasnt locked up in years.. oh wait ever since i got a gf and stopped watching the virus giving videos on the internet.... hahahahaa
      hehehe dido that!
    1. marc180292's Avatar
      marc180292 -
      Originally Posted by GmAz
      maybe you should stop running windows me. I haven't had a lockup in windows in years.

      And guess it goes to show that even changing the clock for dst is a hard job for mac os.
      LOL. If you haven't notice (of course you haven't, your ignorant) Mac OS X does DST automatically and automatically adjusts the clock to the computers position in the world.
    1. chris4851's Avatar
      chris4851 -
      I have a PC and a MAC. Oh and NO it's not a MAC with Windows bootcamp. I use both and neither is better than the other one. However, my PC is faster than my MAC. And Windows 7 rocks!
    1. reveritt90's Avatar
      reveritt90 -
      easy killers theres enough mac vs pc threads

      i noticed this didnt really think anything of it it was werid fan was in full power making a lot of noise
    1. foureight84's Avatar
      foureight84 -
      apple will tell you that it's not a reproducible bug and that it's an isolated incident!