From owner-freebsd-performance@FreeBSD.ORG  Fri Sep 10 21:08:47 2004
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Date: Fri, 10 Sep 2004 23:08:36 +0200
From: Geert Hendrickx <geert.hendrickx@ua.ac.be>
To: Bob Willcox <bob@immure.com>
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cc: freebsd-performance@freebsd.org
cc: oceanare@pacific.net.sg
cc: Willem Jan Withagen <wjw@withagen.nl>
Subject: Re: spreading partitions over multiple drives
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On Fri, Sep 10, 2004 at 11:44:52AM -0500, Bob Willcox wrote:
> On Fri, Sep 10, 2004 at 06:00:51PM +0200, Geert Hendrickx wrote:
> > On Fri, Sep 10, 2004 at 03:21:46PM +0200, Willem Jan Withagen wrote:
> > > I would expect a bigger system to cache just about all file access 
> > > during 'make buildworld'.
> > > Even when building things with -j 64 I can not get my dual-opteron 1Gb 
> > > system  get without free pages.
> > > And as such most files will only be read once, and object output will be 
> > > "slowly" synced on the disks.
> > > Disk I/O rearly becomes the bottleneck, most of the time I'm missing raw 
> > > CPU cycles.
> > > And I have everything on 1 large 200Gb disk.
> > 
> > Ok so adding more RAM may be more useful than an extra harddisk?  Maybe
> > I could even put /tmp or /usr/obj on a RAM-disk?  A fully built /usr/obj
> > is about 350Mb.  
> 
> Hmm, how to you follow the prescribed process of rebooting between the
> buildworld/installkernel and installworld if you put /usr/obj on a RAM
> disk? Following the reboot you'll have no objects to install.
> 
> Bob

Oops! :-)  

GH