RPI3 swap experiments

[Trev]

Trev wrote on 02/07/2018 19:21:
> Now running a make -j4 buildworld with 2G of swap on a USB memory key 
> plugged into a powered USB hub...

No luck, so I think I can now safely discount power issues. The hub had 
its own 2A PSU, the RPi3B+ has a 3A PSU.

FreeBSD rpi3.sentry.org 12.0-CURRENT FreeBSD 12.0-CURRENT #0 r335854: 
Mon Jul  2 16:03:04 AEST 2018 
root at rpi3.sentry.org:/usr/obj/usr/src/arm64.aarch64/sys/RPI3-12.0  arm64

Jul  2 21:02:52 rpi3 kernel: pid 82523 (c++), uid 0, was killed: out of 
swap space

last pid: 82852;  load averages:  4.35,  4.33,  4.19  up 0+02:16:01 
21:02:50
47 processes:  5 running, 42 sleeping
CPU: 78.3% user,  0.0% nice,  7.8% system,  0.3% interrupt, 13.7% idle
Mem: 550M Active, 256K Inact, 159M Laundry, 186M Wired, 97M Buf, 9M Free
Swap: 2G Total, 143M Used, 2G Free, 6% Inuse
     0      0      0      0    0.0      0      0    0.0    0.0  mmcsd0s2a
     5      0      0      0    0.0      0      0    0.0    0.0  da0p1
     0      0      0      0    0.0      0      0    0.0    0.0  da0p2

last pid: 82856;  load averages:  4.35,  4.33,  4.19  up 0+02:16:02 
21:02:51
47 processes:  4 running, 43 sleeping
CPU: 78.3% user,  0.0% nice,  7.8% system,  0.3% interrupt, 13.7% idle
Mem: 520M Active, 412K Inact, 129M Laundry, 185M Wired, 97M Buf, 72M Free
Swap: 2G Total, 114M Used, 2G Free, 5% Inuse
     0      0      0      0    0.0      0      0    0.0    0.0  mmcsd0s2a
     7    455      0      0    0.0    455   7124    9.1  101.7  da0p1
     0      0      0      0    0.0      0      0    0.0    0.0  da0p2

[OUT OF SWAP in the 1 sec between the above and below entries]

last pid: 82860;  load averages:  4.35,  4.33,  4.19  up 0+02:16:04 
21:02:53
46 processes:  3 running, 43 sleeping
CPU: 78.3% user,  0.0% nice,  7.8% system,  0.3% interrupt, 13.7% idle
Mem: 466M Active, 8M Inact, 59M Laundry, 185M Wired, 97M Buf, 187M Free
Swap: 2G Total, 80M Used, 2G Free, 3% Inuse
     0      1      1     32    2.7      0      0    0.0    0.3  mmcsd0s2a
     0     38     38    639    2.6      0      0    0.0   10.0  da0p1
     0      0      0      0    0.0      0      0    0.0    0.0  da0p2