linux-kernel - Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]

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Date:	Sat, 21 Apr 2007 13:07:48 +0200
From:	Willy Tarreau <w@....eu>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]

Hi Ingo,

I'm replying to your 3 mails at once.

On Sat, Apr 21, 2007 at 12:45:22PM +0200, Ingo Molnar wrote:
> 
> * Ingo Molnar <mingo@...e.hu> wrote:
> 
> > > It could become a useful scheduler benchmark !
> > 
> > i just tried ocbench-0.3, and it is indeed very nice!

So as you've noticed just one minute after I put it there, I've updated
the tool and renamed it ocbench. For others, it's here :

    http://linux.1wt.eu/sched/

Useful news are proper positionning, automatic forking, and more visible
progress with smaller windows, which eat less of X ressources.

Now about your idea of making it report information on stdout, I don't
know if it would be that useful. There are many other command line tools
for this purpose. This one's goal is to eat CPU with a visual control of
CPU distribution only.

Concerning your idea of using a signal to resync every process, I agree
with you. Running at 8x8 shows a noticeable offset. I've just uploaded
v0.4 which supports your idea of sending USR1.

> another thing i noticed: when using a -y larger then 1, then the window 
> title (at least on Metacity) overlaps and thus the ocbench tasks have 
> different X overhead and get scheduled a bit assymetrically as well. Is 
> there any way to start them up title-less perhaps?

It has annoyed me a bit too, but I'm no X developer at all, so I don't
know at all if it's possible nor how to do this. I know that my window
manager even adds title bars to xeyes, so I'm not sure we can do this.

Right now, I've added a "-B <border size>" argument so that you can
skip the size of your title bar. It's dirty but it's not my main job :-)

Thanks for your feedback
Willy

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