[Segmentation fault (core dumped)]running tcl

hi everyone
i got the problem when i run tcl as Segmentation fault (core dumped), if i add energy, it working
anyone can help me?

# # Define options set val(chan) Channel/WirelessChannel ;# channel type set val(prop) Propagation/TwoRayGround ;# radio-propagation model set val(netif) Phy/WirelessPhy ;# network interface type set val(mac) Mac/802_11 ;# MAC type set val(ifq) Queue/DropTail/PriQueue ;# interface queue type set val(ll) LL ;# link layer type set val(ant) Antenna/OmniAntenna ;# antenna model set val(ifqlen) 50 ;# max packet in ifq set val(nn) 25 ;# number of mobilenodes set val(rp) AODV ;# routing protocol set val(x) 500 ;# X dimension of topography set val(y) 500 ;# Y dimension of topography set val(stop) 100 ;# time of simulation end ; set ns [new Simulator] set tracefd [open ex-1_without-energy.tr w] set windowVsTime2 [open win.tr w] set namtrace [open ex-1_without-energy.nam w] $ns trace-all $tracefd $ns namtrace-all-wireless $namtrace $val(x) $val(y) # set up topography object set topo [new Topography] $topo load_flatgrid $val(x) $val(y) create-god $val(nn) # # Create nn mobilenodes [$val(nn)] and attach them to the channel. # # configure the nodes $ns node-config -adhocRouting $val(rp) \ -llType $val(ll) \ -macType $val(mac) \ -ifqType $val(ifq) \ -ifqLen $val(ifqlen) \ -antType $val(ant) \ -propType $val(prop) \ -phyType $val(netif) \ -channelType $val(chan) \ -topoInstance $topo \ -agentTrace ON \ -routerTrace ON \ -macTrace OFF \ -movementTrace ON # Menginisialisasi node set node_(0) [$ns node] set node_(1) [$ns node] set node_(2) [$ns node] set node_(3) [$ns node] set node_(4) [$ns node] set node_(5) [$ns node] set node_(6) [$ns node] set node_(7) [$ns node] set node_(8) [$ns node] set node_(9) [$ns node] set node_(10) [$ns node] set node_(11) [$ns node] set node_(12) [$ns node] set node_(13) [$ns node] set node_(14) [$ns node] set node_(15) [$ns node] set node_(16) [$ns node] set node_(17) [$ns node] set node_(18) [$ns node] set node_(19) [$ns node] set node_(20) [$ns node] set node_(21) [$ns node] set node_(22) [$ns node] set node_(23) [$ns node] set node_(24) [$ns node] # provide inisialisasi koordinat node # node 0 $node_(0) set X_ 0.0 $node_(0) set Y_ 0.0 $node_(0) set Z_ 0.0 #node 1 $node_(1) set X_ 100.0 $node_(1) set Y_ 0.0 $node_(1) set Z_ 0.0 #node 2 $node_(2) set X_ 200.0 $node_(2) set Y_ 0.0 $node_(2) set Z_ 0.0 #node 3 $node_(3) set X_ 300.0 $node_(3) set Y_ 0.0 $node_(3) set Z_ 0.0 #node 4 $node_(4) set X_ 400.0 $node_(4) set Y_ 0.0 $node_(4) set Z_ 0.0 #node 5 $node_(5) set X_ 0.0 $node_(5) set Y_ 100.0 $node_(5) set Z_ 0.0 # node 6 $node_(6) set X_ 100.0 $node_(6) set Y_ 100.0 $node_(6) set Z_ 0.0 #node 7 $node_(7) set X_ 200.0 $node_(7) set Y_ 100.0 $node_(7) set Z_ 0.0 #node 8 $node_(8) set X_ 300.0 $node_(8) set Y_ 100.0 $node_(8) set Z_ 0.0 #node 9 $node_(9) set X_ 400.0 $node_(9) set Y_ 100.0 $node_(9) set Z_ 0.0 #node 10 $node_(10) set X_ 0.0 $node_(10) set Y_ 200.0 $node_(10) set Z_ 0.0 #node 11 $node_(11) set X_ 100.0 $node_(11) set Y_ 200.0 $node_(11) set Z_ 0.0 # node 12 $node_(12) set X_ 200.0 $node_(12) set Y_ 200.0 $node_(12) set Z_ 0.0 #node 13 $node_(13) set X_ 300.0 $node_(13) set Y_ 200.0 $node_(13) set Z_ 0.0 #node 14 $node_(14) set X_ 400.0 $node_(14) set Y_ 200.0 $node_(14) set Z_ 0.0 #node 15 $node_(15) set X_ 0.0 $node_(15) set Y_ 300.0 $node_(15) set Z_ 0.0 #node 16 $node_(16) set X_ 100.0 $node_(16) set Y_ 300.0 $node_(16) set Z_ 0.0 #node 17 $node_(17) set X_ 200.0 $node_(17) set Y_ 300.0 $node_(17) set Z_ 0.0 # node 18 $node_(18) set X_ 300.0 $node_(18) set Y_ 300.0 $node_(18) set Z_ 0.0 #node 19 $node_(19) set X_ 400.0 $node_(19) set Y_ 300.0 $node_(19) set Z_ 0.0 #node 20 $node_(20) set X_ 0.0 $node_(20) set Y_ 400.0 $node_(20) set Z_ 0.0 #node 21 $node_(21) set X_ 100.0 $node_(21) set Y_ 400.0 $node_(21) set Z_ 0.0 #node 22 $node_(22) set X_ 200.0 $node_(22) set Y_ 400.0 $node_(22) set Z_ 0.0 #node 23 $node_(23) set X_ 300.0 $node_(23) set Y_ 400.0 $node_(23) set Z_ 0.0 #node 24 $node_(24) set X_ 400.0 $node_(24) set Y_ 400.0 $node_(24) set Z_ 0.0 # Set a TCP connection between node_(2) and node_(8) set tcp [new Agent/TCP/Newreno] $tcp set class_ 2 set sink [new Agent/TCPSink] $ns attach-agent $node_(4) $tcp $ns attach-agent $node_(20) $sink $ns connect $tcp $sink set ftp [new Application/FTP] $ftp attach-agent $tcp $ns at 10.0 "$ftp start" set tcp [new Agent/TCP/Newreno] $tcp set class_ 2 set sink [new Agent/TCPSink] $ns attach-agent $node_(0) $tcp $ns attach-agent $node_(24) $sink $ns connect $tcp $sink set ftp [new Application/FTP] $ftp attach-agent $tcp $ns at 10.0 "$ftp start" # Printing the window size proc plotWindow {tcpSource file} { global ns set time 0.01 set now [$ns now] set cwnd [$tcpSource set cwnd_] puts $file "$now $cwnd" $ns at [expr $now+$time] "plotWindow $tcpSource $file" } $ns at 10.1 "plotWindow $tcp $windowVsTime2" # Define node initial position in nam for {set i 0} {$i < $val(nn)} { incr i } { # 30 defines the node size for nam $ns initial_node_pos $node_($i) 30 } # Telling nodes when the simulation ends for {set i 0} {$i < $val(nn) } { incr i } { $ns at $val(stop) "$node_($i) reset"; } # ending nam and the simulation $ns at $val(stop) "$ns nam-end-wireless $val(stop)" $ns at $val(stop) "stop" $ns at 150 "puts "end simulation" ; $ns halt" proc stop {} { global ns tracefd namtrace $ns flush-trace close $tracefd close $namtrace exec nam ex-1_without-energy.nam & } $ns run

Your English is unclear, but let me try.
You are getting a segmentation fault and a dumped core when you run that tcl code - is that correct?
You also write:"if i add energy, it working."
Is this a laptop? Do you get a segmentation fault on battery, but it works with a power supply? Replace the battery.

Otherwise, a segmentation fault is a memory error, and tcl is established a long time. Tcl or your code are hardly the problem. I would reinstall tcl, check the disks, and run memtest86 on the memory.

Segmentation fault is a memory error, and it is typically a fault in your program.

Since the system says a core file was output, one can analyze that core file using debug utilities.

I'm familiar with how to do this using GDB and for a C or C++ program, but not for tcl. However for these NS2 simulations, I understand that there are C++ utilities which are used as part of the simulation. In order to debug this the way I know how, you'd need the source code and to compile it using the -ggdb flag.

Another way to debug this is similar to what you are doing, varying the content or input files you are using.

Perhaps as opposed to showing the whole script and summarizing what you've tried, you can indicate the exact position in the script where you modify it to use energy versus not, and show the syntax which works and which doesn't. That may give some people a clue as to how to better advise you.

What c ++ compiler is suitable for supporting NS2

Originally Posted by rtmistler Segmentation fault is a memory error, and it is typically a fault in your program. Since the system says a core file was output, one can analyze that core file using debug utilities. I'm familiar with how to do this using GDB and for a C or C++ program, but not for tcl. However for these NS2 simulations, I understand that there are C++ utilities which are used as part of the simulation. In order to debug this the way I know how, you'd need the source code and to compile it using the -ggdb flag. Another way to debug this is similar to what you are doing, varying the content or input files you are using. Perhaps as opposed to showing the whole script and summarizing what you've tried, you can indicate the exact position in the script where you modify it to use energy versus not, and show the syntax which works and which doesn't. That may give some people a clue as to how to better advise you.

Re #1.

Same answer as the one you got ``Sept 13´´ https://groups.google.com/forum/?fro...w/KLgHvWw_CAAJ

About 'Segmentation fault' : ns2 can do Segmentation fault for no obvious reason:
. https://www.linuxquestions.org/quest...20fault%20ns2/
. https://www.linuxquestions.org/quest...-4175499342/#2


Re #4.

Ubuntu 16.04 : The default g++-5.4 is OK.
Ubuntu 18.04 : Use g++-4.8 . I.e. no later than -5.4 can compile ns2.

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