https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241848

--- Comment #5 from Mark Millard <marklmi26-f...@yahoo.com> ---
(In reply to Dave Evans from comment #1)

Was this a -j1 build? Something larger?
(There could be other things worth
reporting about the build context.)

It can be interesting to watch the system with
top sorted by resident RAM use (decreasing).
It can give a clue what are the major things
contributing to low free RAM while watching.

I'm not sure one can infer much from which
process FreeBSD decides to kill. Other
evidence is likely better about what is
contributing to the sustained low free RAM
that likely is what leaded to the process
kill(s).

To Robert:

I've been replying mostly to Dave because it has
been a significant time since I've experimented
with a 1 GiByte machine for buildworld buildkernel
and the like. Dave indicated over 2 GiByte for
his context.

You could try vm.pageout_oom_seq=1200 and a -j1
build and see if it helps you. Reporting the result
here might be useful.

Actually, you indicated "upgrade to FreeBSD 12.1",
so your context is appearently older, such as 12.0.
I'm not sure if vm.pageout_oom_seq goes back
that far. That might leave you only with -j1 (which,
for all I know, you might have already been using).

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