default pool : ConcurrentDequePool
cores        : 2

--- 1 thread(s), 40000 round-trips each ---
  threadLocalPool   (2.x default)      301 ms
  concurrentDeque   (3.x default)      310 ms
  nonRecyclingPool  (no reuse)         496 ms

--- 8 thread(s), 40000 round-trips each ---
  threadLocalPool   (2.x default)      451 ms
  concurrentDeque   (3.x default)      450 ms
  nonRecyclingPool  (no reuse)         808 ms