examples/msg/actions/actions_allReduce.txt

   1 process0 comm_size 3
   2 process0 allReduce 5e8 5e8
   3 process1 allReduce 5e8 5e8
   4 process2 allReduce 5e8 5e8
   5
   6 process0 compute 5e8
   7 process1 compute 5e8
   8 process2 compute 5e8
   9