From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751573AbWF1VuY (ORCPT ); Wed, 28 Jun 2006 17:50:24 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751574AbWF1VuY (ORCPT ); Wed, 28 Jun 2006 17:50:24 -0400 Received: from smtp.osdl.org ([65.172.181.4]:55723 "EHLO smtp.osdl.org") by vger.kernel.org with ESMTP id S1751572AbWF1VuX (ORCPT ); Wed, 28 Jun 2006 17:50:23 -0400 Date: Wed, 28 Jun 2006 14:53:41 -0700 From: Andrew Morton To: Jay Lan Cc: nagar@watson.ibm.com, balbir@in.ibm.com, csturtiv@sgi.com, linux-kernel@vger.kernel.org Subject: Re: [Patch][RFC] Disabling per-tgid stats on task exit in taskstats Message-Id: <20060628145341.529a61ab.akpm@osdl.org> In-Reply-To: <44A2F50D.8030306@engr.sgi.com> References: <44892610.6040001@watson.ibm.com> <20060609010057.e454a14f.akpm@osdl.org> <448952C2.1060708@in.ibm.com> <20060609042129.ae97018c.akpm@osdl.org> <4489EE7C.3080007@watson.ibm.com> <449999D1.7000403@engr.sgi.com> <44999A98.8030406@engr.sgi.com> <44999F5A.2080809@watson.ibm.com> <4499D7CD.1020303@engr.sgi.com> <449C2181.6000007@watson.ibm.com> <20060623141926.b28a5fc0.akpm@osdl.org> <449C6620.1020203@engr.sgi.com> <20060623164743.c894c314.akpm@osdl.org> <449CAA78.4080902@watson.ibm.com> <20060623213912.96056b02.akpm@osdl.org> <449CD4B3.8020300@watson.ibm.com> <44A01A50.1050403@sgi.com> <20060626105548.edef4c64.akpm@osdl.org> <44A020CD.30903@watson.ibm.com> <20060626111249.7aece36e.akpm@osdl.org> <44A026ED.8080903@sgi.com> <20060626113959.839d72bc.akpm@osdl.org> <44A2F50D.8030306@engr.sgi.com> X-Mailer: Sylpheed version 1.0.0 (GTK+ 1.2.10; i386-vine-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Jay Lan wrote: > > Testing with all delay-accounting patches as been in your 2.6.27-mm3 > tree as of 6/26 afternoon (ie, including the send-tgid-once, and > avoid-sending-without-listeners patches), i do not see measurable > performance difference with and without tgid processing when the > exit rate was controlled to around 1000 exit/sec. > > As a result i am OK to not include a design of a system-wise > init-time configuration option (for per-thread group data processing) > in the taskstats interface. Sounds good, thanks. > The ENOBUFS i experienced in my testing would start to happen > when exit rate at around 14000 exits/sec. While our fields confirmed > that a 1000 threads exit/sec was a real, i have no reason to be > concerned of 14000 exits/sec rate. ;) 1000 exits/sec/CPU can happen. How many CPUs did that machine have?