From owner-freebsd-questions@FreeBSD.ORG Mon May 25 19:38:25 2009 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id D1C241065689 for ; Mon, 25 May 2009 19:38:25 +0000 (UTC) (envelope-from wojtek@wojtek.tensor.gdynia.pl) Received: from wojtek.tensor.gdynia.pl (wojtek.tensor.gdynia.pl [IPv6:2001:4070:101:2::1]) by mx1.freebsd.org (Postfix) with ESMTP id DD4C68FC22 for ; Mon, 25 May 2009 19:38:24 +0000 (UTC) (envelope-from wojtek@wojtek.tensor.gdynia.pl) Received: from wojtek.tensor.gdynia.pl (localhost [IPv6:::1]) by wojtek.tensor.gdynia.pl (8.14.3/8.14.3) with ESMTP id n4PJbmAQ041235; Mon, 25 May 2009 21:37:48 +0200 (CEST) (envelope-from wojtek@wojtek.tensor.gdynia.pl) Received: from localhost (wojtek@localhost) by wojtek.tensor.gdynia.pl (8.14.3/8.14.3/Submit) with ESMTP id n4PJbmIs041232; Mon, 25 May 2009 21:37:48 +0200 (CEST) (envelope-from wojtek@wojtek.tensor.gdynia.pl) Date: Mon, 25 May 2009 21:37:48 +0200 (CEST) From: Wojciech Puchar To: Peter Boosten In-Reply-To: Message-ID: References: <200905241315.n4ODFB96007801@mp.cs.niu.edu> <4A1A58FA.60303@boosten.org> <1932D812-03CF-48AF-A306-669C39862EB7@boosten.org> User-Agent: Alpine 2.00 (BSF 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Cc: Yuri , Scott Bennett , freebsd-questions@freebsd.org, utisoft@gmail.com Subject: Re: How can this 'top' command output make sense? Load over 7 and total CPU use ~5% X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 25 May 2009 19:38:26 -0000 > The CPU = "Central Processing Unit" will perform it's calculations at so many > megahertz while at 10% utilization or at 100% utilization. The entire machine no. it will not. all today x86 CPUs reacts on HLT command and doesn't do anything except waiting for interrupt (and saving lots of power). > is only performing at 10% of its capacity, in your statement above. no - CPU is performing at 10% of it's capacity. entire machine (disks, network etc.) is another thing. >> > > Actually, it's a combination of both running and waiting processes. yes that's true. i missed this - all waiting for machine resource to be available+those which are presently calculating something.