From owner-freebsd-current@FreeBSD.ORG Sat May 1 11:49:48 2004 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 27F0616A4CE for ; Sat, 1 May 2004 11:49:48 -0700 (PDT) Received: from mail.pcnet.com (mail.pcnet.com [204.213.232.4]) by mx1.FreeBSD.org (Postfix) with ESMTP id CFFFE43D41 for ; Sat, 1 May 2004 11:49:47 -0700 (PDT) (envelope-from eischen@vigrid.com) Received: from mail.pcnet.com (mail.pcnet.com [204.213.232.4]) by mail.pcnet.com (8.12.10/8.12.1) with ESMTP id i41InlS8025682; Sat, 1 May 2004 14:49:47 -0400 (EDT) Date: Sat, 1 May 2004 14:49:47 -0400 (EDT) From: Daniel Eischen X-Sender: eischen@pcnet5.pcnet.com To: Alexandre Sunny Kovalenko In-Reply-To: <20040501122558.6139dec1.Alex.Kovalenko@verizon.net> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII cc: freebsd-current@freebsd.org Subject: Re: Is it possible to make -lpthread program to use 100% CPU? X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 01 May 2004 18:49:48 -0000 On Sat, 1 May 2004, Alexandre Sunny Kovalenko wrote: > On Thu, 29 Apr 2004 17:16:21 +0200 > Ivan Voras wrote: > > > Alexandre Sunny Kovalenko wrote: > > > > > Alternatively, if there is a need to test a patch or time a program > > > in this environment, it could easily be accomplished -- it is a non- > > > production box. > > > > Could you turn off Hyperthreading and report any changes? > > > > > > _______________________________________________ > > freebsd-current@freebsd.org mailing list > > http://lists.freebsd.org/mailman/listinfo/freebsd-current > > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org" > > I have updated my system to the latest CTM mailing on Friday (4/30) morning (EST). > This includes version 1.176 of kern_thread.c. > > I have turned off hyperthreading and got result, which muddles me rather -- try > as I might, with -lpthread I could not get past 50% CPU utilization (as reported > by 'top') and number of computations per second matching that (number is very > close to that for running single-threaded). Top report with thread view enabled > shows that both KSE are bound to CPU 0 (if I am interpreting C column properly). Are you using system or process scope threads? -- Dan Eischen