From owner-freebsd-threads@FreeBSD.ORG Wed Dec 15 20:19:40 2004 Return-Path: Delivered-To: freebsd-threads@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 36DD716A4CE for ; Wed, 15 Dec 2004 20:19:40 +0000 (GMT) Received: from mail.vicor-nb.com (bigwoop.vicor-nb.com [208.206.78.2]) by mx1.FreeBSD.org (Postfix) with ESMTP id 0299843D45 for ; Wed, 15 Dec 2004 20:19:40 +0000 (GMT) (envelope-from julian@elischer.org) Received: from elischer.org (julian.vicor-nb.com [208.206.78.97]) by mail.vicor-nb.com (Postfix) with ESMTP id BFB487A44A; Wed, 15 Dec 2004 12:19:39 -0800 (PST) Message-ID: <41C09C5B.7060706@elischer.org> Date: Wed, 15 Dec 2004 12:19:39 -0800 From: Julian Elischer User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.3.1) Gecko/20030516 X-Accept-Language: en, hu MIME-Version: 1.0 To: Petri Helenius References: <41C0898E.3090005@he.iki.fi> <41C092EA.7060100@elischer.org> <41C094CB.9010009@he.iki.fi> In-Reply-To: <41C094CB.9010009@he.iki.fi> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit cc: freebsd-threads@freebsd.org Subject: Re: worker thread performance question X-BeenThere: freebsd-threads@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Threading on FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 15 Dec 2004 20:19:40 -0000 Petri Helenius wrote: > Julian Elischer wrote: > >> >> >> Petri Helenius wrote: >> >>> >>> With libpthread is it usually optimal to have as many worker threads >>> (CPU bound stuff) as kern.threads.virtual_cpu or have, say double >>> the number so that there is always a thread in the run queue when >>> another hits a mutex or sleep? >> >> >> >> Are they always runnable? > > > Almost, except when they run into shared structures which obviously > are minimized by design. > >> theoretically you can schedule as many as you want. >> any number > NCPU should keep teh system busy, but >> I'm not sure I fully understand the question. > > > The question was aimed towards if larger runqueue takes more CPU to > maintain than a shorter one does and if threads are involuntarily > switched. yes and yes. > > > Pete > >> >>> >>> >>> Pete >>> >>> _______________________________________________ >>> freebsd-threads@freebsd.org mailing list >>> http://lists.freebsd.org/mailman/listinfo/freebsd-threads >>> To unsubscribe, send any mail to >>> "freebsd-threads-unsubscribe@freebsd.org" >> >> >> >>