I am trying to calculate delay in multiple hop wireless networks by using the AWK program from trace file but I have problem. It saves packet send time of last node as send time.
if ( $19 == "AGT" && $1 == "r" && $35 == "cbr")
{
if(recv == 0)
{
last_pkt_recv = $3;
}
else
{
jitter+=$3 - last_pkt_recv;
j_count++;
last_pkt_recv = $3
}
recv++;
bytes+=$37
ft_time[$41] = $3;
delay += ft_time[$41]-st_time[$41]
}
}
these code helps you to calculate delay using awk script
BEGIN {
seqno = -1;
count = 0;
}
{
#end-to-end delay
if($4 == "AGT" &;& $1 == "s") {
start_time[$6] = $2;
} else if(($7 == "tcp") && ($1 == "r")) {
end_time[$6] = $2;
} else if($1 == "D" && $7 == "tcp") {
end_time[$6] = -1;
}
}
END {
for(i=0; i; 0) {
delay[i] = end_time[i] - start_time[i];
count++;
}
else
{
delay[i] = -1;
}
}
for(i=0; i 0) {
n_to_n_delay = n_to_n_delay + delay[i];
}
}
n_to_n_delay = n_to_n_delay/count;
print "\n";
print "Average End-to-End Delay = " n_to_n_delay * 1000 " ms";
print "\n";
}
You can use this code to calculate the end-to-end delay. However, you should check the columns of your trace file.
# AWK Script for calculating:
# => Average End-to-End Delay.
# ===================================================================
BEGIN {
seqno = -1;
# droppedPackets = 0;
# receivedPackets = 0;
count = 0;
}
{
if($4 == "AGT" && $1 == "s" && seqno < $6) {
seqno = $6;
}
# else if(($4 == "AGT") && ($1 == "r")) {
# receivedPackets++;
# } else if ($1 == "D" && $7 == "tcp" && $8 > 512){
# droppedPackets++;
# }
#end-to-end delay
if($4 == "AGT" && $1 == "s") {
start_time[$6] = $2;
} else if(($7 == "tcp") && ($1 == "r")) {
end_time[$6] = $2;
} else if($1 == "D" && $7 == "tcp") {
end_time[$6] = -1;
}
}
END {
for(i=0; i 0) {
delay[i] = end_time[i] - start_time[i];
count++;
}
else
{
delay[i] = -1;
}
}
for(i=0; i 0) {
n_to_n_delay = n_to_n_delay + delay[i];
}
}
n_to_n_delay = n_to_n_delay/count;
print "\n";
# print "GeneratedPackets = " seqno+1;
# print "ReceivedPackets = " receivedPackets;
# print "Packet Delivery Ratio = " receivedPackets/(seqno+1)*100
#"%";
# print "Total Dropped Packets = " droppedPackets;
print "Average End-to-End Delay = " n_to_n_delay * 1000 " ms";
print "\n";
}
just work out to copeup with ur trace file you will get the results.
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