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    SubjectRe: A nice CPU resource controller
    On 8/30/06, Martin Ohlin <> wrote:
    > To those interested
    > I have been working on a CPU resource controller using the nice value as
    > a control signal. At the moment, the control is done on a
    > per-task-level, but I have plans to extend it to groups of tasks. The
    > control is based on a PI-controller (Proportional, Integral), using an
    > execution time measurement as input to the controller, and the output
    > from the controller as nice value.

    The CKRM e-series is a PID based CPU Controller. It did a good job of
    controlling and smoothing out the load (and variations) and even
    worked with groups. But it achieved all this through some amount of
    complexity. How do you plan to extend the idea to groups? Do you have
    any code that we can look at?

    I do not understand controlling the nice value? Most cpu control the
    bandwidth/time - are there any advantages to controlling the nice
    value? How does this interplay with dynamic priorities that the
    scheduler currently maintains?

    > Using the controller, it is possible to make CPU reservations that in a
    > soft way guarante that tasks achieve as much resources as the
    > corresponding reference indicates.
    > For those interested, the concept is described in more detail along with
    > experiments in the first part of my thesis available at:

    Read one more paper - time

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      Last update: 2006-08-30 17:43    [W:0.020 / U:25.752 seconds]
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