From owner-freebsd-stable  Sun Sep 16 17:12:21 2001
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Date: Sun, 16 Sep 2001 19:12:20 -0500
From: "David W. Chapman Jr." <dwcjr@inethouston.net>
To: Cyrille Lefevre <clefevre@citeweb.net>
Cc: Erik Trulsson <ertr1013@student.uu.se>, stable@FreeBSD.ORG
Subject: Re: make -j4 vs -j8... 4 works, but 8 does not
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On Mon, Sep 17, 2001 at 02:09:34AM +0200, Cyrille Lefevre wrote:
> j1	12:36
> j2	12:46
> j4	11:36
> j8	11:21
> 
> so, for a 12 min job, you could win 1 min using -j4, which may gives
> you 1 hour for a 12 hours job (such as buildworld :). ok, it's not so
> many, but that may help a lot. for instace, I currently use -j4 since
> -j8 is too CPU and memory intensive (the machine slow down significally).
> 
> PS : I'm using SCSI disks. using IDE disks probably gives you different
> results. I/O are very differents between the two.
> 
On my IBM IDE drives with softupdates, tags and write cache enabled, 
on my thunderbird 1100 with 256mb ram, I only do -j5 or -j6 at most.  
I can't seem to get my buildworlds lower than 40 mins.

-- 
David W. Chapman Jr.
dwcjr@inethouston.net	Raintree Network Services, Inc. <www.inethouston.net>
dwcjr@freebsd.org	FreeBSD Committer <www.FreeBSD.org>

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