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    SubjectRe: sched_yield() on "SCHED_FIFO"
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    Date

    Dear,

    Thank you for your reply. However ...

    The supposed action of my program depended on the Round Robin
    scheduling on 1 CPU. The program produced two processes and they would
    be executed alternately, because it yielded each other on 1 CPU. The
    main problem is one process monopolied a CPU even if it executed
    sched_yield().

    On SMP two processes were executed at the same time and caused race
    condition. The action would not be forecasted.

    >>From: NIIBE Yutaka <gniibe@chroot.org>
    >>Subject: sched_yield() on "SCHED_FIFO"
    >>
    >>Kuniyasu SUZAKI writes:
    >> > The process is executed by super user. I was thinking this process
    >> > could measure the time for context switch on the real time class
    >> > "SCHED_FIFO" and it was measured on kernel 2.0.36 and Solaris. But on
    >> > 2.2.5-15 the parent process didn't yield.
    >>
    >>Result of my environment (two CPU PII 266MHz x2).
    >>
    >># ./context
    >>Context swicth time 6 us from 11792 to 11793
    >>Context swicth time 13 us from 11793 to 11792
    >>Context swicth time 4 us from 11792 to 11792
    >>Context swicth time 10 us from 11792 to 11792
    >>Context swicth time 3 us from 11792 to 11793
    >>Context swicth time 4 us from 11793 to 11792
    >>Context swicth time 5 us from 11792 to 11793
    >>Context swicth time 3 us from 11793 to 11792
    >>Context swicth time 5 us from 11792 to 11793
    >># cat /proc/version
    >>Linux version 2.2.10 (root@qwe) (gcc version egcs-2.91.66 19990314 (egcs-1.1.2 release)) #1 SMP Sat Jul 24 17:41:19 JST 1999
    >>#
    >>
    >>Sometimes it switch to other, sometimes not.
    >>--
    >>Niibe Yutaka
    >>

    ------
    suzaki

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