Re: What's that displayed on 'top'?

From: Henrik Morsing (henrik_at_morsing.cc)
Date: 11/28/05

  • Next message: Gene Heskett: "Re: 2.6.14 kernel woes" 
    Date: Mon, 28 Nov 2005 14:36:06 +0000 (GMT)
To: debian users <debian-user@lists.debian.org>

    On Mon, 28 Nov 2005, Tshepang Lekhonkhobe wrote:

    > Hello,
    > On the CPU row of top, there's various stuff displayed:
    > 'us' (which I assume is CPU cycles consumed by processes owned by the
    > user running top), 'sy' (which I assume is those owned by root), 'id'
    > (which I assume means idle), and there is 'wa', 'hi', 'si' whose
    > meaning I don't know.
    > I checked on the manpage without success... Could anyone tell me what
    > these last 3 (wa, hi, si) mean.

    us is 'user' meaning any process regardless of owner running in user
    space. User space is unpriviledged processes without hardware access like
    the kernel.

    sy is system. Regardless of user it's CPU cycles used by threads inside
    the kernel e.g. working for processes asking for hardware access.

    id is idle

    wa is wait which is CPU cycles wasted on waiting for hardware especially
    disk, access.

    hi I've never seen

    si must be swap in? Meaning pages swapped in from swap space.

    Regards,
    Henrik Morsing 

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