From owner-freebsd-current Wed Mar 29 22: 7:33 2000 Delivered-To: freebsd-current@freebsd.org Received: from overcee.netplex.com.au (peter1.yahoo.com [208.48.107.4]) by hub.freebsd.org (Postfix) with ESMTP id 200D837BBBB for ; Wed, 29 Mar 2000 22:07:14 -0800 (PST) (envelope-from peter@netplex.com.au) Received: from netplex.com.au (localhost [127.0.0.1]) by overcee.netplex.com.au (Postfix) with ESMTP id B400E1CD7; Wed, 29 Mar 2000 22:07:08 -0800 (PST) (envelope-from peter@netplex.com.au) X-Mailer: exmh version 2.1.1 10/15/1999 To: Matthew Dillon Cc: Andy Farkas , freebsd-current@FreeBSD.ORG Subject: Re: SMP buildworld times / performance tests In-Reply-To: Message from Matthew Dillon of "Wed, 29 Mar 2000 22:00:41 PST." <200003300600.WAA68006@apollo.backplane.com> Date: Wed, 29 Mar 2000 22:07:08 -0800 From: Peter Wemm Message-Id: <20000330060708.B400E1CD7@overcee.netplex.com.au> Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Matthew Dillon wrote: > > :> time make -j 20 buildworld build FreeBSD-current using 4.0 kernel > :> > :> 4745.607u 1673.646s 1:29:07.45 120.0% 1323+1599k 8237+251565io 1615p f+0w > :> > :> time make -j 20 buildworld build FreeBSD-current using 5.0 kernel > :> > :> 4696.987u 1502.278s 1:10:34.17 146.4% 1359+1641k 10889+4270io 1779pf +0w > : > :Can I ask why is there a huge difference in the number of io (251k vs 4k)? > :What is so different between 4.0 and 5.0 that causes this? > > That is very odd. I'm using the same make.conf on both machines > but even if they weren't the same 19 minutes should not make that sort > of difference in I/O statistics. One other possibility.. was the state of /usr/obj the same? make world does a lot less IO and is generally a fair bit quicker if /usr/obj is empty from the start. Just a thought... Cheers, -Peter To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message