[Bug 264949] lang/gcc11: Needs build time warning for /tmp consumption

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264949

--- Comment #23 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Lorenzo Salvadore from comment #16)

FYI: a beefy18 main-amd64 build started and it actually uses 13
builders. See:

http://beefy18.nyi.freebsd.org/build.html?mastername=main-amd64-default&build=p4cf95047288c_s836d47d38e

It was showing a load average of around 24.4 (at 51%) when I
looked. So it appears to have 48 FreeBSD "cpus" (24 hyperthreaded
cores?)

And 24.4 with MAKE_JOBS_NUMBER=2 per builder means around 12
or 13 builders active if nearly all are using 2 active processes
via make. (Some ports only use 1.) That matches up with the list
of 13 that is shown.

So the load average is only about half of the FreeBSD "cpu"
count. Not a bias to minimizing time-to-completion. (But
some ports do not respect MAKE_JOBS_NUMBER=2 in their
load average contribution, so at times more than half may
be in use.)

With the configuration avoiding load averages that are larger
than the FreeBSD "cpu" count, the port build times are closer
to being independent, more like they would be if built separately.
Thus comparing individual port-build times with other
configurations that do similarly is useful. (But usefully
comparing to a high load average configuration [from lack of such
use of MAKE_JOBS_NUMBER] would be much messier.)

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