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Re: [ns] problem with pareto sources
Vikram hi,
I am running pareto examples with many flows without any problems. I am
having 2.1b7 on a Solaris OS version: 5.7.
I 've also checked your example (with up to 200 flows) again without any
problem. So there must be something particular to your case. Possible
actions: (a) if on unix check you quota :-) (creates a ruther big out.tr
file), else (b) re-install.
regards
PanOS
On Mon, 26 Mar 2001, Vikram Kanodia wrote:
-Hi,
-
-I have been experiencing this weird problem with pareto sources. Whenever
-i have more than certain number of flow active it gives me a segmentation
-fault. The threshold of number of flows is variable. On
-tracing this error using gdb i traced it to rng.cc:
-
-" Program received signal SIGSEGV, Segmentation fault.
- RNGImplementation::next (this=0x30) at rng.cc:136 "
-
-I searched the mailing list and someone else had the same problem but with
-10 to 11 sources (11th one gave him a segmentation fault). Someone replied
-to him saying that that was a nam problem not a ns fault.
-
-I am not using any nam stuff.....and am using ns-2.1b7.....plus it really
-confuses me as some of my friends running ns-2.1b6 can run simulations
-with hundreds of pareto on/off flows with no problems whatsoever. Do i
-need to downgrade/upgrade (to current snapshot)....
-
-Any feedback would be appreciated. I have attached my script below:
-
-Thanks,
--Vikram
-
----------------------------------------------------------------------------
-
-# Define Values
-#
-set val(flows) 20;
-set val(stop) 30.00;# simulation time (sec)
-set val(bandwidth) 10;# link bandwidth (Mb)
-set val(queue-length) 5;# Queue Length (pkts)
-set val(trace) out.tr;# trace file
-
-# Source detail for an ON/OFF source
-set val(pktsize) 250;# Packet size (bytes)
-set val(burst) .5;# Burst time (sec)
-set val(idle) .5;# Idle time (sec)
-set val(peak) 100;# Peak rate (Kbps)
-
-# =======================================================================
-# Main stuff
-# ======================================================================
-
-#Create a simulator object
-set ns [new Simulator]
-
-#Open the trace file
-set tracefile [open $val(trace) w]
-$ns trace-all $tracefile
-
-#Queue limit
-Queue set limit_ $val(queue-length)
-
-#Create two nodes
-set n0 [$ns node]
-set n1 [$ns node]
-
-#Create a simplex link between the nodes
-$ns simplex-link $n0 $n1 ${val(bandwidth)}Mb 5ms DropTail
-
-# Setting up flows from n1 to n0
-for {set i 0} {$i < $val(flows) } {incr i} {
-
- #Create a Null agent (a traffic sink) and attach it to node n1
- set null_($i) [new Agent/Null]
- $ns attach-agent $n1 $null_($i)
-
- #Create a UDP agent and attach it to node n0
- set udp_($i) [new Agent/UDP]
- $ns attach-agent $n0 $udp_($i)
-
- # Create a pareto on/off traffic traffic source and attach it to udp_i
- set pareto_($i) [new Application/Traffic/Pareto]
- $pareto_($i) set packetSize_ $val(pktsize)
- $pareto_($i) set burst-time_ $val(burst)
- $pareto_($i) set idle-time_ $val(idle)
- $pareto_($i) set rate_ ${val(peak)}k
- $pareto_($i) set shape_ 1.5
- $pareto_($i) attach-agent $udp_($i)
-
- #Connect the traffic source with the traffic sink null0
- $ns connect $udp_($i) $null_($i)
-
- #Schedule events
- $ns at 10.0 "$pareto_($i) start"
- $ns at $val(stop) "$pareto_($i) stop"
-}
-
-#Call the finish procedure at end of simulation time
-$ns at $val(stop) "finish"
-
-
-#Define a 'finish' procedure
-proc finish {} {
-
- global ns tracefile qmon bandwidth stop buffer
- $ns flush-trace
- exit 0
-}
-
-#Run the simulation
-$ns run
-
-
-
---
-
-Department of ECE, Rice University | 713 348 3786 (O)| 713 664 5650(H)
-WWW: http://www.ece.rice.edu/~kanodia
-
-
=======================================================
Panos Trimintzios
Research Fellow, Networks Research Group
Centre for Communication Systems Research (CCSR)
Univ. of Surrey, Guildford, Surrey GU2 7XH, U.K.
Office: U37 / BA Building
Tel: +44 (0)1483 876005 Fax: +44 (0)1483 876011
Email: <[email protected]>
WWW: <http://www.ee.surrey.ac.uk/CCSR/Networks>
=======================================================