when i am trying to generate nam file it
gives error : "Flow 1 starts at time 0.000000
Segmentation fault (core dumped)"
plz give me solution how to solve this problem
--------------------------------mkc.tcl---------------------------------------------------
# create scheduler
set ns [new Simulator]
set f [open out.tr w]
$ns trace-all $f
set nf [open out.nam w]
$ns namtrace-all $nf
# turn tracing on
#set ns_f [open HeteroFlow.tr w]
#$ns trace-all $ns_f
#set stat [open stat.txt w]
#create topology
#set number of flows
set N 2
#set the output file
for {set i 1} {$i<=$N} {incr i} {
set out_($i) [open out$i.txt w]
}
#source
for {set i 1} {$i<=$N} {incr i} {
set R_($i) [$ns node]
}
#bottleneck
set R_([expr $N + 1]) [$ns node]
#sink
set R_([expr $N + 2]) [$ns node]
#create the link connecting the source and sink
for {set i 1} {$i<=$N} {incr i} {
$ns duplex-link $R_($i) $R_([expr $N + 1]) 500Mb [expr 100 +
[expr
$i - 1] * 900]ms MKCQueue
}
$ns duplex-link $R_([expr $N + 1]) $R_([expr $N + 2]) 10Mb 10ms MKCQueue
for {set i 1} {$i<=$N} {incr i} {
set mkcq_($i) [[$ns link $R_($i) $R_([expr $N + 1])] queue]
}
set mkcq_([expr $N + 1]) [[$ns link $R_([expr $N + 1]) $R_([expr $N +
2])] queue]
# link capacity
for {set i 1} {$i<=$N} {incr i} {
$mkcq_($i) set C 500000000
# the router sampling interval
#$mkcq_($i) set T 0.1
$mkcq_($i) set T [expr 0.1 * [expr $i - 1]]
$mkcq_($i) set rid $i
}
# the bottleneck link capacity
$mkcq_([expr $N + 1]) set C 10000000
# the router sampling interval
$mkcq_([expr $N + 1]) set T 0.1
$mkcq_([expr $N + 1]) set rid [expr $N + 1]
#create and attach MKC agent
for {set i 1} {$i<=$N} {incr i} {
# create a new MKC sender
set Src_($i) [new Agent/MKC]
# attach the sender at the source node
$ns attach-agent $R_($i) $Src_($i)
$Src_($i) set alpha_ 1000000
$Src_($i) set beta_ 0.5
$Src_($i) set fid_ $i
# set the initial rate
$Src_($i) set init_rate_ 100000
# set the data packet size
$Src_($i) set packetSize_ 200
}
#create and attach MKCSink agents
for {set i 1} {$i<=$N} {incr i} {
set Snk_($i) [new Agent/MKCSink]
# set ACK packet size
$Snk_($i) set packetSize_ 40
# attach the receiver at the sink node
$ns attach-agent $R_([expr $N + 2]) $Snk_($i)
}
# connect each pair of sender and receiver
for {set i 1} {$i<=$N} {incr i} {
$ns connect $Src_($i) $Snk_($i)
}
# schedule the events
$ns at 0 "$Src_(1) start"
$ns at 5 "$Src_(2) start"
for {set i 1} {$i<=$N} {incr i} {
$ns at 0 "record $Src_($i) $out_($i)"
}
for {set i 1} {$i<=$N} {incr i} {
$ns at 100.0 "$Src_($i) stop"
}
$ns at 100.0 "finish"
proc record {mkcsrc file} {
global ns f nf
set step 0.1
set now [$ns now]
set rate_ [$mkcsrc set rate_]
set pkt_loss_ [$mkcsrc set pkt_loss_]
puts $file "$now $rate_ $pkt_loss_"
$ns at [expr $now+$step] "record $mkcsrc $file"
}
proc finish {} {
global ns f nf
$ns flush-trace
close $f
close $nf
puts "running nam...."
exec nam out.nam &
#exec xgraph out0.tr out1.tr out2.tr -geometry 800x400 &
exit 0
}
$ns run
thank you
