Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 18 Dec 2002 12:48:57 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 18 Dec 2002 12:48:57 -0500 Received: from dsl3-63-249-88-76.cruzio.com ([63.249.88.76]:28328 "EHLO athlon.cichlid.com") by vger.kernel.org with ESMTP id ; Wed, 18 Dec 2002 12:48:57 -0500 Date: Wed, 18 Dec 2002 09:56:56 -0800 From: Andrew Burgess Message-Id: <200212181756.gBIHuud27855@athlon.cichlid.com> To: linux-kernel@vger.kernel.org Orig-To: "j.a. magallon" Subject: Re: HT Benchmarks (was: /proc/cpuinfo and hyperthreading) Newsgroups: mail.linux.kernel References: <1_0212161441436926@cichlid.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1226 Lines: 27 >Number of threads Elapsed time User Time System Time >1 53:216 53:220 00:000 >2 29:272 58:180 00:320 >3 27:162 1:21:450 00:540 >4 25:094 1:41:080 01:250 >Elapsed is measured by the parent thread, that is not doing anything >but wait on a pthread_join. User and system times are the sum of >times for all the children threads, that do real work. >The jump from 1->2 threads is fine, the one from 2->4 is ridiculous... >I have my cpus doubled but each one has half the pipelining for floating >point...see the user cpu time increased due to 'worst' processors and >cache pollution on each package. >So, IMHO and for my apps, HyperThreading is just a bad joke. Why do you care about user time? The elapsed time went down by 4 minutes (2->4 threads), if that's a joke I don't get it :-) New Intel Ad: "What are you going to do with your 4 minutes today?" - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/