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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20070419125438.GA27584@1wt.eu>
Date:	Thu, 19 Apr 2007 14:54:38 +0200
From:	Willy Tarreau <w@....eu>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Nick Piggin <npiggin@...e.de>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Con Kolivas <kernel@...ivas.org>,
	Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]

Hi Ingo,

On Thu, Apr 19, 2007 at 11:01:44AM +0200, Ingo Molnar wrote:
> 
> * Willy Tarreau <w@....eu> wrote:
> 
> > Good idea. The machine I'm typing from now has 1000 scheddos running 
> > at +19, and 12 gears at nice 0. [...]
> 
> > From time to time, one of the 12 aligned gears will quickly perform a 
> > full quarter of round while others slowly turn by a few degrees. In 
> > fact, while I don't know this process's CPU usage pattern, there's 
> > something useful in it : it allows me to visually see when process 
> > accelerate/decelerate. [...]
> 
> cool idea - i have just tried this and it rocks - you can easily see the 
> 'nature' of CPU time distribution just via visual feedback. (Is there 
> any easy way to start up 12 glxgears fully aligned, or does one always 
> have to mouse around to get them into proper position?)

-- Replying quickly, I'm short in time --

You can certainly script it with -geometry. But it is the wrong application
for this matter, because you benchmark X more than glxgears itself. What would
be better is something like a line rotating 360 degrees and doing some short
stuff between each degree, so that X is not much sollicitated, but the CPU
would be spent more on the processes themselves.

Benchmarking interactions between X and multiple clients is a completely
different test IMHO. Glxgears is between those two, making it inappropriate
for scheduler tuning.

Regards,
Willy

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