poudriere parallel options

[Russell L. Carter]

Greetings,

So recently LibreOffice has been piling up with
various gcc/thunderbird/firefox/chromium/llvm/
openjdk/virtualbox/etc rebuild jobs and the total
time is exceeding 12 hours.

This is on an 8 core AMD box with 32GB of memory
and ample ccache on a fast SSD.  Neither ram nor
swap capacity seem to be a factor.  This behavior
seems like it is somewhat new.  That's ok!

Supposing those packages noted above were the only
items in a ports list file, what would be the best
practice poudriere parallel configuration options?

Or more specifically, is there a way to limit a
particular package's internally managed parallel jobs
to, say, 2?

Thanks,
Russell