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    SubjectRe: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]

    * Willy Tarreau <w@1wt.eu> wrote:

    > I hacked it a bit to make it accept two parameters :
    > -R <run_time_in_microsecond> : time spent burning CPU cycles at each round
    > -S <sleep_time_in_microsecond> : time spent getting a rest
    >
    > It now advances what it thinks is a second at each iteration, so that
    > it makes it easy to compare its progress with other instances (there
    > are seconds, minutes and hours, so it's easy to visually count up to
    > around 43200).
    >
    > The modified code is here :
    >
    > http://linux.1wt.eu/sched/orbitclock-0.2bench.tgz
    >
    > What is interesting to note is that it's easy to make X work a lot
    > (99%) by using 0 as the sleeping time, and it's easy to make the
    > process work a lot by using large values for the running time
    > associated with very low values (or 0) for the sleep time.
    >
    > Ah, and it supports -geometry ;-)
    >
    > It could become a useful scheduler benchmark !

    i just tried ocbench-0.3, and it is indeed very nice!

    Would it make sense perhaps to (optionally?) also log some sort of
    periodic text feedback to stdout, about the quality of scheduling? Maybe
    even a 'run this many seconds' option plus a summary text output at the
    end (which would output measured runtime, observed longest/smallest
    latency and standard deviation of latencies maybe)? That would make it
    directly usable both as a 'consistency of X app scheduling' visual test
    and as an easily shareable benchmark with an objective numeric result as
    well.

    Ingo
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