From mboxrd@z Thu Jan 1 00:00:00 1970 Received: (from majordomo@localhost) by pauillac.inria.fr (8.7.6/8.7.3) id XAA05131; Fri, 13 Jun 2003 23:33:22 +0200 (MET DST) X-Authentication-Warning: pauillac.inria.fr: majordomo set sender to owner-caml-list@pauillac.inria.fr using -f Received: from nez-perce.inria.fr (nez-perce.inria.fr [192.93.2.78]) by pauillac.inria.fr (8.7.6/8.7.3) with ESMTP id XAA06488 for ; Fri, 13 Jun 2003 23:33:20 +0200 (MET DST) Received: from draco.dyndns.org (81-86-132-151.dsl.pipex.com [81.86.132.151]) by nez-perce.inria.fr (8.11.1/8.11.1) with ESMTP id h5DLXJT26048; Fri, 13 Jun 2003 23:33:19 +0200 (MET DST) Received: from jim by draco.dyndns.org with local (Exim 3.36 #1 (Debian)) id 19QwBG-0000d4-00; Fri, 13 Jun 2003 22:33:54 +0100 Date: Fri, 13 Jun 2003 22:33:54 +0100 From: Jim Farrand To: Xavier Leroy Cc: David McClain , caml-list@inria.fr Subject: Re: [Caml-list] FP's and HyperThreading Processors Message-ID: <20030613213354.GG14726@farrand.net> References: <003601c33177$324ecc40$0201a8c0@dylan> <20030613210751.A2264@pauillac.inria.fr> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: <20030613210751.A2264@pauillac.inria.fr> X-Uptime: 08:45:26 up 2 days, 22:28, 1 user, load average: 1.11, 0.28, 0.09 User-Agent: Mutt/1.5.4i X-Spam: no; 0.00; farrand:01 caml-list:01 misses:01 distinguish:01 0200,:01 wrote:03 cycles:04 fri:07 processors:09 idle:09 counters:11 isn't:11 run:12 between:12 leroy:12 Sender: owner-caml-list@pauillac.inria.fr Precedence: bulk On Fri, Jun 13, 2003 at 09:07:51PM +0200, Xavier Leroy wrote: > How do you measure "CPU utilization"? Different tools have different > notions of CPU utilization. For instance, OS-level tools such as > "top", "ps" or "uptime" treat the time spent by the CPU while stalled > by cache misses and the like as user CPU time, not as idle time. > Only processor-level performance monitor counters can distinguish > between active cycles and stalled cycles. Isn't the point of hyperthreading that the CPU doesn't stall on cache misses, but instead is able to run another process? Or am I misunderstanding the point of hyperthreading? -- Jim Farrand -- ------------------- To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/ Beginner's list: http://groups.yahoo.com/group/ocaml_beginners