duration of buildworld

[Slawa Olhovchenkov]

On Mon, Jul 27, 2015 at 08:47:04PM +0200, Matthias Apitz wrote:

> El d'ia Monday, July 27, 2015 a las 03:00:06PM +0300, Slawa Olhovchenkov escribi'o:
> 
> > On Mon, Jul 27, 2015 at 07:58:04AM +0200, Matthias Apitz wrote:
> > 
> > > 
> > > Hello,
> > > 
> > > Yesterday I grabbed r285885 from SVN and launched a 
> > > 
> > > # make -j2 buildworld
> > > 
> > > which is still running after 19 hours on a server of 2 CPU of the type
> > > Intel(R) Core(TM)2 Extreme CPU X9100  @ 3.06GHz and 4 GByte memory.
> > > 
> > > Last time in January with r276659 on the same host it took only some 8
> > > hours, IIRC.
> > > 
> > > Is there anything wrong of what could cause this change of the build
> > > time?
> > 
> > May be swap trashing on clang compilation?
> 
> This pointed in the right direction. I have had 6x 1 GByte additional
> swap partitions to plain files mounted (because I needed this to get
> the eclipse port compiled within poudriere). After changing the fstab and
> reboot, the 'make buildkernel' takes only half an hour.
> 
> Why is this?

swap to ZFS volume don't work some time ago (don't know about current
status).
May be swap to file on ZFS don't work also?