Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750867AbVKXNM5 (ORCPT ); Thu, 24 Nov 2005 08:12:57 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750857AbVKXNM4 (ORCPT ); Thu, 24 Nov 2005 08:12:56 -0500 Received: from pentafluge.infradead.org ([213.146.154.40]:13192 "EHLO pentafluge.infradead.org") by vger.kernel.org with ESMTP id S1750778AbVKXNMz (ORCPT ); Thu, 24 Nov 2005 08:12:55 -0500 Subject: Re: [patch] SMP alternatives From: Arjan van de Ven To: =?ISO-8859-1?Q?P=E1draig?= Brady Cc: Linus Torvalds , Daniel Jacobowitz , Alan Cox , "H. Peter Anvin" , Andi Kleen , Gerd Knorr , Dave Jones , Zachary Amsden , Pavel Machek , Andrew Morton , Linux Kernel Mailing List , Zwane Mwaikambo , Pratap Subrahmanyam , Christopher Li , "Eric W. Biederman" , Ingo Molnar In-Reply-To: <4385B9BB.7020007@draigBrady.com> References: <1132764133.7268.51.camel@localhost.localdomain> <20051123163906.GF20775@brahms.suse.de> <1132766489.7268.71.camel@localhost.localdomain> <4384AECC.1030403@zytor.com> <1132782245.13095.4.camel@localhost.localdomain> <20051123214835.GA24044@nevyn.them.org> <20051123222056.GA25078@nevyn.them.org> <4385B9BB.7020007@draigBrady.com> Content-Type: text/plain Date: Thu, 24 Nov 2005 14:12:07 +0100 Message-Id: <1132837928.2832.33.camel@laptopd505.fenrus.org> Mime-Version: 1.0 X-Mailer: Evolution 2.2.3 (2.2.3-2.fc4) Content-Transfer-Encoding: 7bit X-Spam-Score: 1.8 (+) X-Spam-Report: SpamAssassin version 3.0.4 on pentafluge.infradead.org summary: Content analysis details: (1.8 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.1 RCVD_IN_SORBS_DUL RBL: SORBS: sent directly from dynamic IP address [213.93.14.173 listed in dnsbl.sorbs.net] 1.7 RCVD_IN_NJABL_DUL RBL: NJABL: dialup sender did non-local SMTP [213.93.14.173 listed in combined.njabl.org] X-SRS-Rewrite: SMTP reverse-path rewritten from by pentafluge.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 933 Lines: 24 > Just a note to say glibc is getting better wrt to locking. > Compare the results and trival test program here: > http://lkml.org/lkml/2001/12/7/75 > That showed that for glibc 2.2.4, getc & putc > were 669% slower than the unlocked versions. > > 4 years later and with 2.3.5-1ubuntu1, getc & putc > are only 230% slower than the unlocked versions: > > $ dd bs=1MB count=100 if=/dev/zero | ./locked >/dev/null > 100000000 bytes transferred in 3.709362 seconds (26958813 bytes/sec) > $ dd bs=1MB count=100 if=/dev/zero | ./unlocked >/dev/null > 100000000 bytes transferred in 1.602427 seconds (62405339 bytes/sec) this could also mean that the unlocked version has gotten slower ;) - 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/