[Bug 227609] Compiling world from sources fails: out of swap space

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227609

--- Comment #11 from Mark Millard <marklmi26-fbsd at yahoo.com> ---
(In reply to Mark Millard from comment #7)

[I've been updating old notes in this area with
recent results from a 1 GiByte RAM context: an
RPi3. It can do a head -j4 buildworld buildkernel
when appropriately configured. Material copied to
below from another place I updated.]

I've tried a 1 GiByte aarch64 context for a -j4
buildworld buildkernel . . .

I had a RPi3 that was based on head -r358966 do a
build world buildkernel of the same version, from
scratch, -j4 style. The RPi3 is a 1 GiByte RAM
context. I had 3072 GiBytes for the swap partition.
That ,and the ufs file system, were on a USB SSD,
not the microsd card.

The build completed without any /var/log/message or
console output during the build. My modified version
of top reported (details copied from a ssh window) . . .

For Mem: 738512Ki MaxObsActive, 190608Ki MaxObsWired, 906372Ki MaxObs(Act+Wir)
For Swap:  1927Mi MaxObsUsed

(top was started before the build. "MaxObs" is short
for "Maximum Observed".)

The build took a few minutes under 31 hrs.

The build used (my PINE64 media are also set up
to boot the RPi3, explaining some naming):

vm.pageout_oom_seq=120
vm.pfault_oom_attempts=-1
vfs.root.mountfrom="ufs:/dev/gpt/PINE642Groot"
dumpdev="/dev/gpt/PINE642Gswp2"
/dev/gpt/PINE642Groot           /               ufs rw,noatime          1 1
/dev/gpt/PINE642Gswap           none            swap sw                 0 0

(So this avoided the microsd card for ufs and
swap/page space.)

Overall, it looks like having more than 2 GiBytes
of swap partition is appropriate for -j4 : 1927
MiByte is not much less than 2048 MiByte.

But, with appropriate configuration anyway, the
RPi3 can do buildworld buildkernel for head 13,
even -j4 style.

This was aarch64. armv7 style with 1 GiByte RAM
does not allow as much swap/page space without
complaining at boot. It does not appear that
such a -j4 build would be appropriate for armv7.
But I've not investigated what would fit.

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