So, after getting into RC2, I was trying to optimize my pinning using the new interface.  I looked up my NUMA boundaries in the process:    numactl --hardware available: 2 nodes (0-1) node 0 cpus: 0 1 2 3 4 5 6 7 16 17 18 19 20 21 22 23 node 0 size: 32040 MB node 0 free: 256 MB # <<< Make note of this value node 1 cpus: 8 9 10 11 12 13 14 15 24 25 26 27 28 29 30 31 node 1 size: 32243 MB node 1 free: 19974 MB node distances: node 0 1 0: 10 16 1: 16 10 I'm currentl