Comment on NumPy allocation pathway

Author: jakirkham

distributed/comm/utils.py

@@ -20,6 +20,7 @@
 
 # Find the function, `host_array()`, to use when allocating new host arrays
 try:
+    # Use NumPy, when available, to avoid memory initialization cost
     import numpy
 
     host_array = lambda n: memoryview(numpy.empty((n,), dtype="u1"))  # type: ignore