speed up port compiling using RAM (tmpfs) ???

[Sergey Babkin]

Kris Kennaway wrote:
> 
> On Fri, Jan 20, 2006 at 11:25:33AM -0600, Sergey Babkin wrote:
> > >From: =?ISO646-US?Q?Dag-Erling_Sm=3Frgrav?= <des at des.no>
> >
> > >Gary Thorpe <gthorpe at myrealbox.com> writes:
> > >> This effectively means that you cannot take advantage of SMP to
> > >> compile FreeBSD's ports collection. That sounds like a big
> > >> limitation...especially for people trying to speed up bulk builds.
> > >
> > >We cannot be held responsible for race conditions in the Makefiles of
> > >third-party software.
> >
> > Well, maybe we can then build multiple ports in parallel.
> > I guess the way to do it would be to run the top-level make with
> > -j but then disable it when calling the makefiles of the
> > individual ports. Not that I have any idea how to actually
> > do that.
> 
> It's harder than that, because you need to impose dependency
> information and mutual exclusion between different makes.  e.g. they
> can't both be compiling the same port at the same time, which will
> happen if you just do the naive thing.

That's the part that "make -j" is supposed to take care of,
since it should build in parallel only the targets independent
of each other.

-SB