From owner-freebsd-current@FreeBSD.ORG Fri Feb 17 19:49:25 2006 Return-Path: X-Original-To: freebsd-current@freebsd.org Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id A161316A420 for ; Fri, 17 Feb 2006 19:49:25 +0000 (GMT) (envelope-from jasone@freebsd.org) Received: from lh.synack.net (lh.synack.net [204.152.188.37]) by mx1.FreeBSD.org (Postfix) with ESMTP id 46D7443D46 for ; Fri, 17 Feb 2006 19:49:24 +0000 (GMT) (envelope-from jasone@freebsd.org) Received: by lh.synack.net (Postfix, from userid 100) id 1E7585E48F7; Fri, 17 Feb 2006 11:49:24 -0800 (PST) Received: from [129.101.159.79] (unknown [129.101.159.79]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by lh.synack.net (Postfix) with ESMTP id BCFF65E48ED; Fri, 17 Feb 2006 11:49:19 -0800 (PST) In-Reply-To: <43F6174A.7060801@rogers.com> References: <20060215024339.N22450@atlantis.atlantis.dp.ua> <43F29BF5.4060300@freebsd.org> <20060216123548.GA35910@uk.tiscali.com> <20060216135138.GA16669@flame.pc> <43F525A6.3080701@rogers.com> <20060217013039.GA31540@xor.obsecurity.org> <43F6174A.7060801@rogers.com> Mime-Version: 1.0 (Apple Message framework v746.2) Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Message-Id: <1091E3C1-1E93-4030-9097-D28C780F9D44@freebsd.org> Content-Transfer-Encoding: 7bit From: Jason Evans Date: Fri, 17 Feb 2006 11:49:03 -0800 To: Mike Jakubik X-Mailer: Apple Mail (2.746.2) X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on lh.synack.net X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=none autolearn=failed version=3.0.4 Cc: freebsd-current@freebsd.org, Kris Kennaway Subject: Re: Virtual memory consumption (both user and kernel) in modern CURRENT X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 17 Feb 2006 19:49:25 -0000 On Feb 17, 2006, at 10:34 AM, Mike Jakubik wrote: > Kris Kennaway wrote: >> On Thu, Feb 16, 2006 at 08:23:50PM -0500, Mike Jakubik wrote: >> >>> And what am i trading off here? I have "/etc/malloc.conf@ -> ajz" >>> and my >>> memory usage has gone up the roof. My system used to be swap >>> free, and now its swapping over 40 MB. Can someone explain to me >>> why this new malloc is better? I don't see any speed improvements. >> >> It's a couple of orders of magnitude faster for threaded binaries. >> See earlier posts by the author for extensive discussion. > > Great, too bad only 2% of my applications are threaded. I just > don't see this change very positively, using 40MB of swap, where > before was none does not seem to me like a speed improvement. I'm > all for better performance of threaded apps, but the trade off > seems too high. Are redzones enabled? (They are turned on by default in CURRENT.) You can check by reading the output from something like: MALLOC_OPTIONS=P ls Keep in mind that they use up substantial extra memory -- 32 bytes per allocation. Unless you have disabled redzones, you should expect much higher memory usage with jemalloc than with phkmalloc. Thanks, Jason