throughput awk script

BEGIN {

       recvdSize = 0

       startTime = 1e6

       stopTime = 0

  }

  {

       # Trace line format: new

       if ($2 == "-t") {

             event = $1

             time = $3

             node_id = $5

             flow_id = $39

             pkt_id = $41

             pkt_size = $37

             flow_t = $45

             level = $19

       }

  # Store start time

  if (level == "AGT" && (event
== "+" || event == "s") && pkt_size >=
512) {

    if (time < startTime) {

             startTime = time

             }

       }

  # Update total received packets' size and
store packets arrival time

  if (level == "AGT" && event
== "r" && pkt_size >= 512) {

       if (time > stopTime) {

             stopTime = time

             }

       # Rip off the header

       hdr_size = pkt_size % 512

       pkt_size -= hdr_size

       # Store received packet's size

       recvdSize += pkt_size

       }

  }

  END {

       printf("Average Throughput[kbps] =
%.2f\t\t
StartTime=%.2f\tStopTime=%.2f\n",(recvdSize/(stopTime-startTime))*(8/1000),startTime,stopTime)

  }