Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751238AbXAPPPp (ORCPT ); Tue, 16 Jan 2007 10:15:45 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751242AbXAPPPp (ORCPT ); Tue, 16 Jan 2007 10:15:45 -0500 Received: from mx1.redhat.com ([66.187.233.31]:56996 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751238AbXAPPPo (ORCPT ); Tue, 16 Jan 2007 10:15:44 -0500 Message-ID: <45ACEBDF.60602@redhat.com> Date: Tue, 16 Jan 2007 07:14:39 -0800 From: Ulrich Drepper Organization: Red Hat, Inc. User-Agent: Thunderbird 1.5.0.9 (X11/20061219) MIME-Version: 1.0 To: Pierre Peiffer CC: LKML , Ingo Molnar , Andrew Morton , Jakub Jelinek Subject: Re: [PATCH 2.6.20-rc4 0/4] futexes functionalities and improvements References: <45A3BFAC.1030700@bull.net> <45A67830.4050207@redhat.com> <20070111134615.34902742.akpm@osdl.org> <45A73E90.7050805@bull.net> <20070112075816.GA23341@elte.hu> <45AC8E2A.3060708@bull.net> In-Reply-To: <45AC8E2A.3060708@bull.net> X-Enigmail-Version: 0.94.1.2.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enigBA9A568BF06096F3868F137E" Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1661 Lines: 44 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigBA9A568BF06096F3868F137E Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Pierre Peiffer wrote: > I've run this bench 1000 times with pipe and 800 groups. > Here are the results: This is not what I'm mostly concerned about. The patches create a bottleneck since _all_ processes use the same resource. Plus, this code has to be run on a machine with multiple processors to get RFOs into play= =2E So, please do this: on an SMP (4p or more) machine, rig the test so that it runs quite a while. Then, in a script, start the program a bunch of times, all in parallel. Have the script wait until all program runs are done and time the time until the last program finishes. --=20 =E2=9E=A7 Ulrich Drepper =E2=9E=A7 Red Hat, Inc. =E2=9E=A7 444 Castro St = =E2=9E=A7 Mountain View, CA =E2=9D=96 --------------enigBA9A568BF06096F3868F137E Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iD8DBQFFrOvf2ijCOnn/RHQRArOMAKCZyFz6o28umdXWl0+hthdG4tjSdQCgnSHJ tpG2iLFITS52rEMwtoSwQ2w= =LVdC -----END PGP SIGNATURE----- --------------enigBA9A568BF06096F3868F137E-- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/