From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264443AbTLLBJY (ORCPT ); Thu, 11 Dec 2003 20:09:24 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264449AbTLLBJY (ORCPT ); Thu, 11 Dec 2003 20:09:24 -0500 Received: from dp.samba.org ([66.70.73.150]:45015 "EHLO lists.samba.org") by vger.kernel.org with ESMTP id S264443AbTLLBJX (ORCPT ); Thu, 11 Dec 2003 20:09:23 -0500 From: Rusty Russell To: Nick Piggin Cc: linux-kernel , Ingo Molnar , Anton Blanchard , "Martin J. Bligh" , "Nakajima, Jun" , Mark Wong Subject: Re: [CFT][RFC] HT scheduler In-reply-to: Your message of "Thu, 11 Dec 2003 19:57:31 +1100." <3FD8317B.4060207@cyberone.com.au> Date: Fri, 12 Dec 2003 11:58:59 +1100 Message-Id: <20031212010922.BA8B12C15F@lists.samba.org> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org In message <3FD8317B.4060207@cyberone.com.au> you write: > > > Nick Piggin wrote: > > > > > Don't ask me why it runs out of steam at 150 rooms. hackbench does > > something similar. I think it might be due to some resource running > > short, or a scalability problem somewhere else. > > > OK, it is spinning on .text.lock.futex. The following results are > top 10 profiles from a 120 rooms run and a 150 rooms run. The 150 > room run managed only 24.8% the throughput of the 120 room run. > > Might this be a JVM problem? Not if hackbench is showing it. > I'm using Sun Java HotSpot(TM) Server VM (build 1.4.2_01-b06, mixed mode) > > ROOMS 120 150 > PROFILES > total 100.0% 100.0% > default_idle 81.0% 66.8% > .text.lock.rwsem 4.6% 1.3% > schedule 1.9% 1.4% > .text.lock.futex 1.5% 19.1% Increase FUTEX_HASHBITS? Rusty. -- Anyone who quotes me in their sig is an idiot. -- Rusty Russell.