poudriere, swap full and top says memory is free ?

Hi!

I'm running

- a poudriere build
- of a list of ports
- on 12.0-RELEASE-p10
- on a 4 core+4 hyperthreads CPU, an Intel(R) Xeon(R) CPU E3-1230 v6
  _at_ 3.50GHz
- with 32 GB RAM
- zpool with 2x 500 GB SSDs as a mirror

and right now, this can be seen:

last pid: 90922;  load averages:  5.02,  5.14,  5.73    up 0+03:53:08  19:31:05
82 processes:  6 running, 76 sleeping
CPU: 60.6% user,  0.0% nice,  2.1% system,  0.0% interrupt, 37.3% idle
Mem: 4598M Active, 2854M Inact, 11G Laundry, 6409M Wired, 6375M Free
ARC: 3850M Total, 1721M MFU, 2090M MRU, 665K Anon, 19M Header, 19M Other
     3406M Compressed, 3942M Uncompressed, 1.16:1 Ratio
Swap: 18G Total, 18G Used, 396K Free, 99% Inuse, 68K In

So: Swap is full, approx. 6 GB memory is reported as free.

This is surprising. Can I somehow tune this in any way, so that
the memory available is used for the build ? Or is the problem somewhere
else ?

Running similar builds on 12.0 without patches reported
swap_pager_getswapspace(24): failed
messages.

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