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    SubjectRe: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
    On Sat, Apr 14, 2007 at 03:01:01PM +0200, Willy Tarreau wrote:
    >
    > Well, I'll stop heating the room for now as I get out of ideas about how
    > to defeat it.

    Ah, I found something nasty.
    If I start large batches of processes like this :

    $ for i in $(seq 1 1000); do ./scheddos2 4000 4000 & done

    the ramp up slows down after 700-800 processes, but something very
    strange happens. If I'm under X, I can switch the focus to all xterms
    (the WM is still alive) but all xterms are frozen. On the console,
    after one moment I simply cannot switch to another VT anymore while
    I can still start commands locally. But "chvt 2" simply blocks.
    SysRq-K killed everything and restored full control. Dmesg shows lots
    of :
    SAK: killed process xxxx (scheddos2): process_session(p)==tty->session.

    I wonder if part of the problem would be too many processes bound to
    the same tty :-/

    I'll investigate a bit.

    Willy



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