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nsc: rework tcp-nsc-zoo example

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- fix segfault when nodes argument <=3
- reduce data rate and run time to get smaller pcap files
- add rng seed to make output stable
This commit is contained in:
Florian Westphal
2008-09-11 01:34:46 +02:00
parent 0d8bed8b04
commit 7fb1cd3b38
1 changed files with 36 additions and 19 deletions
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55
examples/tcp-nsc-zoo.cc
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@@ -25,7 +25,7 @@
//
// - Pcap traces are saved as tcp-nsc-zoo-$n-0.pcap, where $n represents the node number
// - TCP flows from n0 to n1, n2, n3, from n1 to n0, n2, n3, etc.
// Usage (e.g.): ./waf --run 'tcp-nsc-zoo --Nodes=5'
// Usage (e.g.): ./waf --run 'tcp-nsc-zoo --nodes=5'
#include <iostream>
#include <string>
@@ -45,14 +45,23 @@ int main(int argc, char *argv[])
{
CsmaHelper csma;
unsigned int MaxNodes = 4;
unsigned int runtime = 3;
Config::SetDefault ("ns3::OnOffApplication::PacketSize", UintegerValue (4096));
Config::SetDefault ("ns3::OnOffApplication::DataRate", StringValue ("1Mb/s"));
RandomVariable::UseGlobalSeed (1, 1, 2, 3, 5, 8);
Config::SetDefault ("ns3::OnOffApplication::PacketSize", UintegerValue (2048));
Config::SetDefault ("ns3::OnOffApplication::DataRate", StringValue ("8kbps"));
CommandLine cmd;
// this allows the user to raise the number of nodes using --Nodes=X command-line argument.
cmd.AddValue("Nodes", "Number of nodes in the network", MaxNodes);
// this allows the user to raise the number of nodes using --nodes=X command-line argument.
cmd.AddValue("nodes", "Number of nodes in the network (must be > 1)", MaxNodes);
cmd.AddValue("runtime", "How long the applications should send data (default 3 seconds)", runtime);
cmd.Parse (argc, argv);
if (MaxNodes < 2)
{
std::cerr << "--nodes: must be >= 2" << std::endl;
return 1;
}
csma.SetChannelAttribute ("DataRate", DataRateValue (DataRate(100 * 1000 * 1000)));
csma.SetChannelAttribute ("Delay", TimeValue (MicroSeconds (200)));
@@ -70,16 +79,24 @@ int main(int argc, char *argv[])
Config::Set ("/NodeList/1/$ns3::Ns3NscStack<linux2.6.26>/net.ipv4.tcp_sack", StringValue ("0"));
Config::Set ("/NodeList/1/$ns3::Ns3NscStack<linux2.6.26>/net.ipv4.tcp_timestamps", StringValue ("0"));
Config::Set ("/NodeList/1/$ns3::Ns3NscStack<linux2.6.26>/net.ipv4.tcp_window_scaling", StringValue ("0"));
internetStack.Install (n.Get(2));
// the next statement doesn't change anything for the nodes 0, 1, and 2; since they
// already have a stack assigned.
internetStack.SetNscStack ("liblinux2.6.18.so");
// this switches node 3 to NSCs Linux 2.6.18 stack.
internetStack.Install (n.Get(3));
// and then agains disables sack/timestamps/wscale on node 3.
Config::Set ("/NodeList/3/$ns3::Ns3NscStack<linux2.6.18>/net.ipv4.tcp_sack", StringValue ("0"));
Config::Set ("/NodeList/3/$ns3::Ns3NscStack<linux2.6.18>/net.ipv4.tcp_timestamps", StringValue ("0"));
Config::Set ("/NodeList/3/$ns3::Ns3NscStack<linux2.6.18>/net.ipv4.tcp_window_scaling", StringValue ("0"));
if (MaxNodes > 2)
{
internetStack.Install (n.Get(2));
}
if (MaxNodes > 3)
{
// the next statement doesn't change anything for the nodes 0, 1, and 2; since they
// already have a stack assigned.
internetStack.SetNscStack ("liblinux2.6.18.so");
// this switches node 3 to NSCs Linux 2.6.18 stack.
internetStack.Install (n.Get(3));
// and then agains disables sack/timestamps/wscale on node 3.
Config::Set ("/NodeList/3/$ns3::Ns3NscStack<linux2.6.18>/net.ipv4.tcp_sack", StringValue ("0"));
Config::Set ("/NodeList/3/$ns3::Ns3NscStack<linux2.6.18>/net.ipv4.tcp_timestamps", StringValue ("0"));
Config::Set ("/NodeList/3/$ns3::Ns3NscStack<linux2.6.18>/net.ipv4.tcp_window_scaling", StringValue ("0"));
}
// the freebsd stack is not yet built by default, so its commented out for now.
// internetStack.SetNscStack ("libfreebsd5.so");
for (unsigned int i =4; i < MaxNodes; i++)
@@ -97,7 +114,7 @@ int main(int argc, char *argv[])
PacketSinkHelper sinkHelper ("ns3::TcpSocketFactory", InetSocketAddress (Ipv4Address::GetAny (), servPort));
// start a sink client on all nodes
ApplicationContainer sinkApp = sinkHelper.Install (n);
sinkApp.Start (Seconds (1.0));
sinkApp.Start (Seconds (0));
sinkApp.Stop (Seconds (30.0));
// This tells every node on the network to start a flow to all other nodes on the network ...
@@ -116,14 +133,14 @@ int main(int argc, char *argv[])
clientHelper.SetAttribute
("OffTime", RandomVariableValue (ConstantVariable (0)));
ApplicationContainer clientApp = clientHelper.Install(n.Get(i));
clientApp.Start (Seconds (j + 1.0)); /* delay startup depending on node number */
clientApp.Stop (Seconds (j + 10.0));
clientApp.Start (Seconds (j)); /* delay startup depending on node number */
clientApp.Stop (Seconds (j + runtime));
}
}
CsmaHelper::EnablePcapAll ("tcp-nsc-zoo");
Simulator::Stop (Seconds(1000));
Simulator::Stop (Seconds(100));
Simulator::Run ();
Simulator::Destroy ();