From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e23smtp03.au.ibm.com (e23smtp03.au.ibm.com [202.81.31.145]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 9DB732C0089 for ; Thu, 20 Mar 2014 03:09:41 +1100 (EST) Received: from /spool/local by e23smtp03.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 20 Mar 2014 02:09:39 +1000 Received: from d23relay05.au.ibm.com (d23relay05.au.ibm.com [9.190.235.152]) by d23dlp02.au.ibm.com (Postfix) with ESMTP id AF3812BB0054 for ; Thu, 20 Mar 2014 03:09:37 +1100 (EST) Received: from d23av04.au.ibm.com (d23av04.au.ibm.com [9.190.235.139]) by d23relay05.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id s2JFnHrh8388990 for ; Thu, 20 Mar 2014 02:49:18 +1100 Received: from d23av04.au.ibm.com (localhost [127.0.0.1]) by d23av04.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id s2JG9aOH006196 for ; Thu, 20 Mar 2014 03:09:37 +1100 Date: Wed, 19 Mar 2014 21:39:33 +0530 From: Srikar Dronamraju To: Peter Zijlstra Subject: Re: Tasks stuck in futex code (in 3.14-rc6) Message-ID: <20140319160933.GA30295@linux.vnet.ibm.com> References: <20140319152619.GB10406@linux.vnet.ibm.com> <20140319154705.GB8557@laptop.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 In-Reply-To: <20140319154705.GB8557@laptop.programming.kicks-ass.net> Cc: linuxppc-dev@lists.ozlabs.org, LKML , davidlohr@hp.com, paulus@samba.org, tglx@linutronix.de, torvalds@linux-foundation.org, mingo@kernel.org Reply-To: Srikar Dronamraju List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , > > > > Infact I can reproduce this if the java_constraint is either node, socket, system. > > However I am not able to reproduce if java_constraint is set to core. > > What's any of that mean? > Using the constraint, one can specify how many jvm instances should participate in the specjbb run. For example on a 4 node box, I can say 2 jvms per constraint with constraint set to node and specjbb will run with 8 instances of java. I was running with 1 jvm per constraint. But when I set the constraint to node/System, I keep seeing this problem. However if I set the constraint to core (which means running more instances of java), the problem is not seen. I kind of guess, the lesser the number of java instances the easier it is to reproduce. -- Thanks and Regards Srikar Dronamraju From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965727AbaCSQJp (ORCPT ); Wed, 19 Mar 2014 12:09:45 -0400 Received: from e23smtp02.au.ibm.com ([202.81.31.144]:48832 "EHLO e23smtp02.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965684AbaCSQJm (ORCPT ); Wed, 19 Mar 2014 12:09:42 -0400 Date: Wed, 19 Mar 2014 21:39:33 +0530 From: Srikar Dronamraju To: Peter Zijlstra Cc: davidlohr@hp.com, torvalds@linux-foundation.org, tglx@linutronix.de, mingo@kernel.org, LKML , linuxppc-dev@lists.ozlabs.org, benh@kernel.crashing.org, paulus@samba.org Subject: Re: Tasks stuck in futex code (in 3.14-rc6) Message-ID: <20140319160933.GA30295@linux.vnet.ibm.com> Reply-To: Srikar Dronamraju References: <20140319152619.GB10406@linux.vnet.ibm.com> <20140319154705.GB8557@laptop.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: <20140319154705.GB8557@laptop.programming.kicks-ass.net> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 14031916-5490-0000-0000-00000533FE0C Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > > > > Infact I can reproduce this if the java_constraint is either node, socket, system. > > However I am not able to reproduce if java_constraint is set to core. > > What's any of that mean? > Using the constraint, one can specify how many jvm instances should participate in the specjbb run. For example on a 4 node box, I can say 2 jvms per constraint with constraint set to node and specjbb will run with 8 instances of java. I was running with 1 jvm per constraint. But when I set the constraint to node/System, I keep seeing this problem. However if I set the constraint to core (which means running more instances of java), the problem is not seen. I kind of guess, the lesser the number of java instances the easier it is to reproduce. -- Thanks and Regards Srikar Dronamraju