Dear all,
Does any body know about the start_time in the END
procedure of LWood awk script to calculate packet
average end-to-end delay?
where does the start_time in the END proc. get from?
BEGIN {
# simple awk script to generate end-to-end packet
lifetime statistics
# in a form suitable for plotting with xgraph.
# Lloyd Wood, July 1999.
# http://www.ee.surrey.ac.uk/Personal/L.Wood/ns/
highest_packet_id = 0;
}
{
action = $1;
time = $2;
node_1 = $3;
node_2 = $4;
src = $5;
flow_id = $8;
node_1_address = $9;
node_2_address = $10;
seq_no = $11;
packet_id = $12;
if ( packet_id > highest_packet_id )
highest_packet_id = packet_id;
# getting start time is not a problem, provided
you're not starting
# traffic at 0.0.
# could test for sending node_1_address or flow_id
here.
if ( start_time[packet_id] == 0 )
start_time[packet_id] = time;
# only useful for small unicast where packet_id
doesn't wrap.
# checking receive means avoiding recording drops
if ( action != "d" ) {
if ( action == "r" ) {
# could test for receiving node_2_address or flow_id
here.
end_time[packet_id] = time;
}
} else {
end_time[packet_id] = -1;
}
}
END {
for ( packet_id = 0; packet_id <=
highest_packet_id; packet_id++ ) {
start = start_time[packet_id];
end = end_time[packet_id];
packet_duration = end - start;
if ( start < end ) printf("%d %f\n", start,
packet_duration);
}
We dont have any start time in the format of trace
file generated by ns! Actually sending a packet from
a node is not captured as a send event.
Best Regards,
[EMAIL PROTECTED] |(@RiMiR@|)
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