libx265 NUMA pool configuration misleading
As the excerpt below says, 


  A thread pool dedicated to a given NUMA node is enabled only when the
  number of threads to be created on that NUMA node is explicitly
  mentioned in that corresponding position


"+,-,+"  --> no numerals stated, hence a single pool.

"8,+,+,+" --> numeral for node 0, hence that's one pool. The other nodes have no numerals, hence any threads spawned there are managed within a consolidated (2nd) pool.

No experience with NUMA, just parsing the quoted doc.