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 OAA24229; Fri, 29 Nov 2002 14:25:22 +0100 (MET) X-Authentication-Warning: pauillac.inria.fr: majordomo set sender to owner-caml-list@pauillac.inria.fr using -f Received: from concorde.inria.fr (concorde.inria.fr [192.93.2.39]) by pauillac.inria.fr (8.7.6/8.7.3) with ESMTP id OAA24169 for ; Fri, 29 Nov 2002 14:25:21 +0100 (MET) Received: from mg.ihep.su (mg.ihep.su [194.190.161.38]) by concorde.inria.fr (8.11.1/8.11.1) with ESMTP id gATDPJX22994 for ; Fri, 29 Nov 2002 14:25:20 +0100 (MET) Received: by mg.ihep.su (Postfix, from userid 65436) id 7D233B5293; Fri, 29 Nov 2002 16:25:18 +0300 (MSK) Received: from ontil.ihep.su (ontil.ihep.su [194.190.161.63]) by mg.ihep.su (Postfix) with ESMTP id 5C8EDB5284; Fri, 29 Nov 2002 16:25:17 +0300 (MSK) Received: from localhost (vsl@localhost) by ontil.ihep.su (8.11.6/8.11.6) with ESMTP id gATDPBX31664; Fri, 29 Nov 2002 16:25:12 +0300 Date: Fri, 29 Nov 2002 16:25:11 +0300 (MSK) From: Vitaly Lugovsky To: Tim Freeman Cc: , Subject: Re: [Caml-list] Why systhreads? In-Reply-To: <20021127153447.107B47F86@lobus.fungible.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-caml-list@pauillac.inria.fr Precedence: bulk On Wed, 27 Nov 2002, Tim Freeman wrote: > > I tried OCaml in a non memory-consuming numerical applications on SMP. > >Seems to work well enough (100% load of all the processors). > > Wrong metric. You want speedup, not CPU utilization. You can get CPU > utilization for free by running an infinite loop. Did the application > run anywhere near N times faster when you were using N processors? Yes. But, >80% of the system time was in external C functions, without any memory management. So, really wrong metric... ------------------- 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