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Date: Sat, 14 Apr 2007 22:12:27 +0200
From: Willy Tarreau <w@1wt.eu>
To: William Lee Irwin III <wli@holomorphy.com>
Cc: Ingo Molnar <mingo@elte.hu>, Nick Piggin <npiggin@suse.de>,
       linux-kernel@vger.kernel.org,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Con Kolivas <kernel@kolivas.org>, Mike Galbraith <efault@gmx.de>,
       Arjan van de Ven <arjan@infradead.org>,
       Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
Message-ID: <20070414201227.GA4536@1wt.eu>
References: <20070413202100.GA9957@elte.hu> <20070414020424.GB14544@wotan.suse.de> <20070414063254.GB14875@elte.hu> <20070414064334.GA19463@elte.hu> <20070414080833.GL943@1wt.eu> <20070414083625.GM943@1wt.eu> <20070414194855.GZ2986@holomorphy.com>
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On Sat, Apr 14, 2007 at 12:48:55PM -0700, William Lee Irwin III wrote:
> On Sat, Apr 14, 2007 at 10:36:25AM +0200, Willy Tarreau wrote:
> > Forking becomes very slow above a load of 100 it seems. Sometimes,
> > the shell takes 2 or 3 seconds to return to prompt after I run
> > "scheddos &"
> > Those are very promising results, I nearly observe the same responsiveness
> > as I had on a solaris 10 with 10k running processes on a bigger machine.
> > I would be curious what a mysql test result would look like now.
> 
> Where is scheddos?

I will send it to you off-list. I've been avoiding to publish it for a long
time because the stock scheduler was *very* sensible to trivial attacks
(freezes larger than 30s, impossible to log in). It's very basic, and I
have no problem sending it to anyone who requests it, it's just that as
long as some distros ship early 2.6 kernels I do not want it to appear on
mailing list archives for anyone to grab it and annoy their admins for free.

Cheers,
Willy