Ping-Pong Scheme For i=o To Runs-1 do if(my node id=o)then*发送者* start time =second ( 米 send an m-byte message to node 1 米 receive an m-byte message from node 1 * end time=second ( 米 total time =end time-start time * communication time[i]=total time/2 米 else if(my_node id=1)then/*接收者*/ 米 receive an m-byte message from node o send an m-byte message to node o 米 endif endif 米 endfor 6 2011/9/13 For i=o To Runs‐1 do  if （my _node _id =0） then /*发送者*/  start _time =second（ ）  send an m‐byte message to node 1  receive an m‐byte message from node 1  end_time = second（ ）  total_time = end_time – start_time  communication_time[i] = total_time/2  else if （my_node_id = 1） then /*接收者*/  receive an m‐byte message from node 0  send an m‐byte message to node 0  endif  endif  endfor 6 2011/9/13 Ping‐Pong Scheme