Messages in this thread | | | Date | Sat, 14 Apr 2007 15:27:32 +0200 | From | Willy Tarreau <> | Subject | Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS] |
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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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