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Thread: 12 cores on Ubuntu Lucid/Maverick?

  1. #1
    Join Date
    Sep 2010
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    Red face 12 cores on Ubuntu Lucid/Maverick?

    I am building a computing/research server containing 2 CPUs: 2x Intel Xeon E5645 for a total of 12 cores, and 24GB of RAM. I am looking for a Linux distribution to install on this new system. My current server (single CPU, 2 cores) is running Lucid, and I love it so I am hoping there is some way to overcome the 8 core limit I've read about.

    Will I need to do anything special to get Lucid or Maverick to work with all 12 cores on the 64-bit server distro?
    Last edited by StatsJunkie; May 24th, 2011 at 08:45 AM.

  2. #2
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    Sep 2010
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    Re: 12 cores on Ubuntu Lucid/Maverick?

    Come to think of it, does this limitation still even exist?

  3. #3
    Join Date
    Apr 2006
    Location
    Scotland
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    1,225
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    Ubuntu 8.04 Hardy Heron

    Re: 12 cores on Ubuntu Lucid/Maverick?

    should be able to handle 12 cores fine.

    that said, i don't know the exact compiler configuration used on ubuntu. If you compile your own the limit is around 256?

    it should be fine though.

  4. #4
    Join Date
    Feb 2005
    Location
    Oregon
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    496
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: 12 cores on Ubuntu Lucid/Maverick?

    There's a CONFIG_NR_CPUS option in the kernel config. In 7.10 and earlier it was 8. Since either 8.10 or 8.04 it's been 64, at least in the 64 bit kernels. And it might go up to 256 cores in the near future. The 32 bit kernels might still be limited to 8, judging by this, this, and this.

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