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Thread: Hyperthreading Enabled by Default?

  1. #1
    Join Date
    Sep 2006
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    Ubuntu 11.04 Natty Narwhal

    Hyperthreading Enabled by Default?

    I've come across a few old articles on the web that suggest that hyperthreading isn't enabled by default in Ubuntu. Some of those articles date back to 2006 so can someone clarify this for Lucid please?

    I have an i7 system and would like to make sure it's enabled for when I start folding.

  2. #2
    Join Date
    Feb 2010
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    Silicon Valley
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    Xubuntu 12.04 Precise Pangolin

    Re: Hyperthreading Enabled by Default?

    One way to tell: On the command line, run the "top" command. Now hit the 1 (one) key, which switches top's display from an aggregate cpu state display to a per-cpu state display. Your quad-core i7 should show up as 8 cpus if hyperthreading is working. (Adjust accordingly if you have a newer 2- or 6-core cpu.)

  3. #3
    Join Date
    Sep 2006
    Location
    UK
    Beans
    878
    Distro
    Ubuntu 11.04 Natty Narwhal

    Re: Hyperthreading Enabled by Default?

    Thanks - it shows 8 cores as it should for an i7 920.

    I also ran:

    Code:
    dmesg | grep Intel
    which shows 8 cores too - I should have thought about that before!

  4. #4
    Join Date
    Oct 2009
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    Córdoba, Argentina
    Beans
    8
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    Ubuntu 8.04 Hardy Heron

    Re: Hyperthreading Enabled by Default?

    A bit late but just came across this. First, wow, enjoy that beast i7 hahaha.

    Another option that I like to use:
    Code:
    cat /proc/cpuinfo
    That way you see the logical processors split with the cache and other cool features you have. I don't have to scroll down too much with my two logicals but you'll have a heck of a time with eight =)

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