nullfs performance (Re: cvs commit: ports/Mk bsd.emacs.mk bsd.gnome.mk bsd.mail.mk bsd.openssl.mk bsd.port.mk bsd.port.subdir.mk bsd.python.mk bsd.ruby.mk bsd.scons.mk ports/Tools/scripts security-check.awk ports/databases/p5-DBD-Oracle Makefile ports/databases/p5-sqlrelay ...)

[Kris Kennaway]

On Sat, Aug 19, 2006 at 01:24:43PM +0200, G?bor K?vesd?n wrote:
> Kris Kennaway wrote:
> >On Thu, Aug 17, 2006 at 01:45:46PM -0700, Brian Somers wrote:
> >
> >  
> >>I guess the missing info might be that things get indirected somewhat.
> >>
> >>We check out code into /some/deep/directory/tree.  Then, to protect
> >>against the 80 character path limitation, we create /tmp/bld.XXXXX/
> >>and create a scratch -> /tmp/bld.XXXXX symlink in
> >>/some/deep/directory/tree.
> >>    
> >
> >Hmm, could be due to the indirecting I guess...you should be able to
> >test that pretty easily.
> >
> >  
> >>We then do various things like:
> >>
> >>    mount -t nullfs /some/deep/directory/tree/src scratch/build/src
> >>    mount -t nullfs /some/deep/directory/tree/obj scratch/build/obj
> >>    mount -t devfs devfs scratch/dev
> >>    mount -t procfs procfs scratch/proc
> >>
> >>and do a "OBJDIRPREFIX=/build/obj chroot scratch make -C /build/src".
> >>
> >>Oh, and errum, we've got debug.mpsafenet="0" in /boot/loader.conf -
> >>which is a remnant of when we were using 5.4 and the races in the
> >>socket code killed our application under load.
> >>
> >>Does the nullfs code path hit the network stack??
> >>    
> >
> >No.
> >
> >Kris
> >  
> I don't have success with mount_nullfs on 6.1/amd64 either:
> 
> [root at server /jail/www/usr]# mount_nullfs /usr/ports /jail/www/usr/ports
> mount_nullfs: Operation not supported by device

Presumably it is not enabled in your kernel and you do not have the
module available either (it is present on a default installation
though).  I use nullfs on amd64 every day so I know it works fine.

Kris
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