Subject: Re: newidle balancing in NUMA domain?
From: Mike Galbraith <efault@gmx.de>
To: Nick Piggin <npiggin@suse.de>
Cc: Peter Zijlstra <peterz@infradead.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Ingo Molnar <mingo@elte.hu>
In-Reply-To: <1259052035.8843.106.camel@marge.simson.net>
References: <20091123112228.GA2287@wotan.suse.de>
	 <1258987059.6193.73.camel@marge.simson.net>
	 <20091123151152.GA19175@wotan.suse.de> <1258989704.4531.574.camel@laptop>
	 <20091123152931.GD19175@wotan.suse.de>
	 <1258991617.6182.21.camel@marge.simson.net>
	 <20091124065322.GC20981@wotan.suse.de>
	 <1259052035.8843.106.camel@marge.simson.net>
Content-Type: text/plain
Date: Tue, 24 Nov 2009 09:58:00 +0100
Message-Id: <1259053080.6081.2.camel@marge.simson.net>
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1345
Lines: 30

On Tue, 2009-11-24 at 09:40 +0100, Mike Galbraith wrote:
> On Tue, 2009-11-24 at 07:53 +0100, Nick Piggin wrote:
> > On Mon, Nov 23, 2009 at 04:53:37PM +0100, Mike Galbraith wrote:
> > > On Mon, 2009-11-23 at 16:29 +0100, Nick Piggin wrote:
> > > 
> > > > So basically about the least well performing or scalable possible
> > > > software architecture. This is exactly the wrong thing to optimise
> > > > for, guys.
> > > 
> > > Hm.  Isn't fork/exec our daily bread?
> > 
> > No. Not for handing out tiny chunks of work and attempting to do
> > them in parallel. There is this thing called Amdahl's law, and if
> > you write a parallel program that wantonly uses the heaviest
> > possible primitives in its serial sections, then it doesn't deserve
> > to go fast.
> 
> OK by me.  A bit if idle time for kbuild is easily cured with telling
> make to emit more jobs, so there's enough little jobs to go around.
> 
> If x264 is declared dainbramaged, that's fine with me too.

(P.S. I don't want to have to explain to users of any such thread happy
applications why they suck rocks under Linux though)

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/