From owner-freebsd-hackers@FreeBSD.ORG  Thu Jul 15 17:16:12 2004
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 113A416A4CE
	for <freebsd-hackers@freebsd.org>;
	Thu, 15 Jul 2004 17:16:12 +0000 (GMT)
Received: from f7.mail.ru (f7.mail.ru [194.67.57.37])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 991CA43D5F
	for <freebsd-hackers@freebsd.org>;
	Thu, 15 Jul 2004 17:16:11 +0000 (GMT)
	(envelope-from shmukler@mail.ru)
Received: from mail by f7.mail.ru with local 
	id 1Bl9q6-000JOY-00; Thu, 15 Jul 2004 21:16:10 +0400
Received: from [24.184.137.115] by msg.mail.ru with HTTP;
	Thu, 15 Jul 2004 21:16:10 +0400
From: Igor Shmukler <shmukler@mail.ru>
To: Avishay Traeger <atraeger@cs.sunysb.edu>
Mime-Version: 1.0
X-Mailer: mPOP Web-Mail 2.19
X-Originating-IP: [24.184.137.115]
Date: Thu, 15 Jul 2004 21:16:10 +0400
In-Reply-To: <Pine.GSO.4.53.0407151244290.18538@compserv1>
Content-Type: text/plain; charset=koi8-r
Content-Transfer-Encoding: 8bit
Message-Id: <E1Bl9q6-000JOY-00.shmukler-mail-ru@f7.mail.ru>
cc: freebsd-hackers@freebsd.org
Subject: Re: Self-tuning parameters
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
Reply-To: Igor Shmukler <shmukler@mail.ru>
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 15 Jul 2004 17:16:12 -0000

Avishay,
First thing to look at - statistics gathering code in vm_pageout.c.
It collects basic usage information upon which various decisions are made.
Then pageout thread basically does GCing based on memory pressure.
Used to be that depedning on pass number [vm_pageout(int pass)] system would either force or not force GC.
Logic is that is system recovered enough pages in one pass, pressure in not too high.
IS.
PS I am not 100% function names are accurate, but as far as I remember that's the basic idea.

-----Original Message-----
From: Avishay Traeger <atraeger@cs.sunysb.edu>
To: freebsd-hackers@freebsd.org
Date: Thu, 15 Jul 2004 12:51:22 -0400 (EDT)
Subject: Self-tuning parameters

> 
> I am currently looking into how various operating systems self-tune their
> memory-related parameters (automatically adjusting parameters such as how
> much memory is allocated for various caches, buffer flushing rates, etc.).
> I have read a few posts indicating that FreeBSD self-tunes many of these
> parameters.  I was wondering if you could provide me with specific
> information (or point me at source code) about where and how FreeBSD does
> this.
> 
> Thanks in advance,
> Avishay Traeger
> _______________________________________________
> freebsd-hackers@freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-hackers
> To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org"
> 


http://Mail.Ru - лучшая почта с неограниченным объемом почтового ящика!