[Bug 241848] lib/googletest/gtest/tests: gmock-matchers_test.cc requires a pathological amount of memory to compile

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

--- Comment #7 from Dave Evans <dave.evans55 at googlemail.com> ---
Thanks for all the useful comments.

I've now set

kern.maxswzone=42949664

which as far as I can tell from loader(8) is the value to be used for a
theoretical 8GB of swap.

I've configured 4GB of swap and rebooted.

I then ran a stress test of running 3 compilations of the offending file
simultaneously and
monitored the system with top.

Each job peaked at size: 1500M, resident: 600M

swap usage peaked at 75% or 3054M

The 3 jobs took 30 minutes to complete, as I would expect.
There were no out of swap messages, which I good.

The initial problem was that default kern.maxswzone was set way
too low. It is not something I've ever tweaked before. It was probably
not allowing more than 1GB or less of swap.

This experience has taught me to read the output of dmesg more frequently
and studiously. It also helps to read the man pages.

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