After update to r357104 build of poudriere jail fails with 'out of swap space'

[Mark Linimon]

On Sat, Jan 25, 2020 at 03:59:06PM -0800, Cy Schubert wrote:
> A rule of thumb would probably be, have ~ 2 GB RAM for every core or
> thread when doing large parallel builds.

This is a rule of thumb that I have used for quite some time.

Perhaps less is necessary for certain tasks, but if you want to build
compilers or other heavy packages, this seems to work.

mcl