Date: Wed, 29 Mar 2000 22:07:08 -0800 From: Peter Wemm <peter@netplex.com.au> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: Andy Farkas <andyf@speednet.com.au>, freebsd-current@FreeBSD.ORG Subject: Re: SMP buildworld times / performance tests Message-ID: <20000330060708.B400E1CD7@overcee.netplex.com.au> In-Reply-To: Message from Matthew Dillon <dillon@apollo.backplane.com> of "Wed, 29 Mar 2000 22:00:41 PST." <200003300600.WAA68006@apollo.backplane.com>
next in thread | previous in thread | raw e-mail | index | archive | help
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
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20000330060708.B400E1CD7>