On 11 Jul 2002, Steve Wingate wrote:
> On Thu, 2002-07-11 at 00:03, Annelise Anderson wrote:
> > I would like to do a make world with /usr/obj and /usr/src
> > on memory disks (this system has 2GB RAM, so I figure 512MB
> > for each ought to be enough). This is a 4.6-stable system.
> >
> > I created some md devices in /dev, but can't make
> > mount_mfs work with something like
> > mount_mfs -s 1048576 /dev/md0 /usr/src
> > or mount_mfs -s 1048576 /dev/md0s1 /usr/src
> >
> What you want is:
> mount_mfs -s 900000 /dev/ad0s1b /usr/obj
> ( for a 450MB'ish MFS)
>
> assuming that device is your swap. Incidentally I tried mounting obj &
> src into MFS on this box then did 'make -jn world' with n going from 2
> to 16 and they were ALL slower than the simple 'make world' with
> everything on disk. Since I can make world in 25 minutes already it
> wasn't the end of the world, how I was sure this would've cut it to < 20
> minutes at least.
>
Thanks, that worked. Mine was a few minutes faster (just under 27
minutes) instead of 29 or so on the buildworld, where I used -j16.
Peter Wemm said in an informal forum that the bottleneck is the
"make" command, which has to start running a process before it will
(if I have this right) begin another process. So with fast disks
and softupdates, it doesn't help much use the memory file system.
But heh, it was fun, and I learned how to do it, thanks to you and
others. :)
Annelise
--
Annelise Anderson
Author of: FreeBSD: An Open-Source Operating System for Your PC
Available from: BSDmall.com and amazon.com
Book Website: http://www.bittreepress.com/FreeBSD/introbook/
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