From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030787AbXDWEg1 (ORCPT ); Mon, 23 Apr 2007 00:36:27 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1161178AbXDWEg1 (ORCPT ); Mon, 23 Apr 2007 00:36:27 -0400 Received: from smtp107.mail.mud.yahoo.com ([209.191.85.217]:39988 "HELO smtp107.mail.mud.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1030787AbXDWEg1 (ORCPT ); Mon, 23 Apr 2007 00:36:27 -0400 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com.au; h=Received:X-YMail-OSG:Message-ID:Date:From:User-Agent:X-Accept-Language:MIME-Version:To:CC:Subject:References:In-Reply-To:Content-Type:Content-Transfer-Encoding; b=c4SqtL5HBb8ZUont1qs1w6cBgqcFb+KxgRxOUzwTRAej3dsYgZsP8EAQKrHiNBHoLu2DbzVcQYzw2H2Y95kmyYk1lFz+7sea2mx1fH0bwBGy9hsk3UhdlgVgbknhlRBwkwkYeZN2AGXN2XEFJhCr2NOMkwtc34BQ/4caZvG4HkA= ; X-YMail-OSG: 90HoDFkVM1mb2yAOB.zsfM9yLp1o08F6l3YmqVMsiFt_S9iXj3eUByfp3eK8FVW9ta11kuvKMv.VAXBEtY_1L7_irY5lwnltsbbnppYe_F8aKrIHqL_AXfmOiF0T3g-- Message-ID: <462C37B9.5090600@yahoo.com.au> Date: Mon, 23 Apr 2007 14:36:09 +1000 From: Nick Piggin User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.12) Gecko/20051007 Debian/1.7.12-1 X-Accept-Language: en MIME-Version: 1.0 To: Jakub Jelinek CC: Rik van Riel , Andrew Morton , linux-kernel , linux-mm , shak Subject: Re: [PATCH] lazy freeing of memory through MADV_FREE References: <46247427.6000902@redhat.com> <20070420135715.f6e8e091.akpm@linux-foundation.org> <462932BE.4020005@redhat.com> <20070420150618.179d31a4.akpm@linux-foundation.org> <4629524C.5040302@redhat.com> <20070421071202.GA355@devserv.devel.redhat.com> In-Reply-To: <20070421071202.GA355@devserv.devel.redhat.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Jakub Jelinek wrote: > On Fri, Apr 20, 2007 at 07:52:44PM -0400, Rik van Riel wrote: > >>It turns out that Nick's patch does not improve peak >>performance much, but it does prevent the decline when >>running with 16 threads on my quad core CPU! >> >>We _definately_ want both patches, there's a huge benefit >>in having them both. >> >>Here are the transactions/seconds for each combination: >> >> vanilla new glibc madv_free kernel madv_free + mmap_sem >>threads >> >>1 610 609 596 545 >>2 1032 1136 1196 1200 >>4 1070 1128 2014 2024 >>8 1000 1088 1665 2087 >>16 779 1073 1310 1999 > > > FYI, I have uploaded a testing glibc that uses MADV_FREE and falls back > to MADV_DONTUSE if MADV_FREE is not available, to > http://people.redhat.com/jakub/glibc/2.5.90-21.1/ Hmm, I wonder how glibc malloc stacks up to tcmalloc on this test (after the mmap_sem patch as well). I'll try running that as well! -- SUSE Labs, Novell Inc.