From owner-svn-src-all@FreeBSD.ORG Fri Nov 30 20:52:53 2012 Return-Path: Delivered-To: svn-src-all@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id ABB5D359; Fri, 30 Nov 2012 20:52:53 +0000 (UTC) (envelope-from peter@rulingia.com) Received: from vps.rulingia.com (host-122-100-2-194.octopus.com.au [122.100.2.194]) by mx1.freebsd.org (Postfix) with ESMTP id 1AF228FC0C; Fri, 30 Nov 2012 20:52:52 +0000 (UTC) Received: from server.rulingia.com (c220-239-239-142.belrs5.nsw.optusnet.com.au [220.239.239.142]) by vps.rulingia.com (8.14.5/8.14.5) with ESMTP id qAUKqhJd070945 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Sat, 1 Dec 2012 07:52:44 +1100 (EST) (envelope-from peter@rulingia.com) X-Bogosity: Ham, spamicity=0.000000 Received: from server.rulingia.com (localhost.rulingia.com [127.0.0.1]) by server.rulingia.com (8.14.5/8.14.5) with ESMTP id qAUKqbVM069282 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Sat, 1 Dec 2012 07:52:37 +1100 (EST) (envelope-from peter@server.rulingia.com) Received: (from peter@localhost) by server.rulingia.com (8.14.5/8.14.5/Submit) id qAUKqaBF069280; Sat, 1 Dec 2012 07:52:36 +1100 (EST) (envelope-from peter) Date: Sat, 1 Dec 2012 07:52:35 +1100 From: Peter Jeremy To: "Matthew D. Fuller" Subject: Re: svn commit: r242102 - in head: contrib/bmake usr.bin/bmake Message-ID: <20121130205235.GA84363@server.rulingia.com> References: <201210252318.q9PNI6IQ069461@svn.freebsd.org> <20121114172823.GA20127@dragon.NUXI.org> <20121114184837.GA73505@kib.kiev.ua> <20121115151622.J1179@besplex.bde.org> <20121115084121.GI66994@over-yonder.net> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="VS++wcV0S1rZb1Fb" Content-Disposition: inline In-Reply-To: <20121115084121.GI66994@over-yonder.net> X-PGP-Key: http://www.rulingia.com/keys/peter.pgp User-Agent: Mutt/1.5.21 (2010-09-15) Cc: svn-src-head@FreeBSD.org, svn-src-all@FreeBSD.org, src-committers@FreeBSD.org X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Nov 2012 20:52:53 -0000 --VS++wcV0S1rZb1Fb Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable [A bit delayed] On 2012-Nov-15 02:41:22 -0600, "Matthew D. Fuller" wrote: >On Thu, Nov 15, 2012 at 06:07:27PM +1100 I heard the voice of >Bruce Evans, and lo! it spake thus: >>=20 >> Maybe malloc() would be faster with MALLOC_PRODUCTION. I use >> /etc/malloc.conf -> aj locally. freefall doesn't have >> /etc/malloc.conf. MALLOC_OPTIONS no longer works, and MALLOC_CONF >> is too large for me to understand, so I don't know how to turn off >> non-production features dynamically. > >FWIW, I suspected MALLOC_PRODUCTION in some massive slowdowns I see >from time to time on my -CURRENT box. Most vividly around running >portupgrade-related bits (portupgrade, pkgdb, etc). I got annoyed by >it enough a few weeks ago to write up a quickie to bang malloc() >around and see what happened. Attached, just for grins. Not defining MALLOC_PRODUCTION causes quite significant startup costs for any process that uses malloc() at all. In this case, jemalloc verifies that memory obtained from the kernel is zero-filled, causing (thousands of unnecessary) page faults. For a short-running process that doesn't allocate all the space in the jemalloc arenas, this dominates the runtime - in the case of /bin/echo, I measured 87 page faults with MALLOC_PRODUCTION and 2133 without. --=20 Peter Jeremy --VS++wcV0S1rZb1Fb Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (FreeBSD) iEYEARECAAYFAlC5HJMACgkQ/opHv/APuIeCqACgtQM6+UkZ7zbht12xgkTZoilv Mf0AoJ0aeI5dZENkCDFSkE2RX3PNZJ9D =nraQ -----END PGP SIGNATURE----- --VS++wcV0S1rZb1Fb--