code: def profile_many_empty_tasks(lview, n, block=True):
      lview.map(echo(0), [None] * n, block=block)
  
imports: import sys
  import numpy
  import ipyparallel
label_desc: Use image node_id 2 for calling a global function with example usage: profile_many_empty_tasks(lview, n, block) without return types