NS-3 Trace Files Creation

[mshuk...@gmail.com]

Dear all

I have gone through the NS-3 tutorial. I am new to this nightmare software.

I have a question. I want to generate the default trace files in simulations. Like ns-2 by default generates .tr file, I have found that ns-3 does not generate .tr files.

Ns-3 tutorial does talk about tracing and logging but I am not able to get anything from it. It says there are two methods to generate tracing in ns-3 - one by default everything and the other selection what parameters are to be collected in tracing. I want to generate all the parameters in tracefile and will use python to extract whatever is required (easier method).

How can one generate by default all the tracefile?

Thanks.

[Erdem Tuna]

Hello,

Could you please give an example of a specific trace file you want to generate?



11 Ağustos 2018 Cumartesi 19:47:27 UTC+3 tarihinde mshuk...@gmail.com yazdı:

[Mukul Shukla]

Thanks for the reply Erden. I can understand, its a too trivial question for others to answer me.

I am learning to simulate the Mobile AdHoc Network Routing Protocols (eg. AODV). I have some background of ns-2 in doing so. When I use to simulate the protocol it use to generate the .tr file which I then use to parse it to extract meaningful information. I want to do the same now using ns3. There is a mention of generating the trace file in the tutorial but hard for me to understand.

I want to generated the file with all the possible information (as was in ns2) and I will then parse it for extracting meaningful information (like Packet Delivery Ratio). The tutorial mentions that there is a better way of doing so which means I can extract the only information which I require. But I am OK with getting all the information and will slowly use this feature later.

The question is how can I generate all the information to a trace file? Is there an explanation of the trace file format of ns-3 (NS-2 is having wonderful explanation on the wireless trace files)?.

I hope am clear now.

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[Erdem Tuna]

Hello Mukul,

I see your point, generally, I follow the following procedure ( I hope it will be correct to generate a trace of a custom variable):

• To  print the custom traces, first the related variable must be found in respective “.cc” class file.

• Once the variable is found, find the method that the variable is in.

• Go to the “.h” file of the same class.

• If the method is private and constant, declare the following variables in the private section of the header file.

• mutable std::ofstream m_mmWaveOutFile;

• mutable std::string m_mmWaveOutputFilename;

• Then in the “.cc” file find the ClassName::ClassName() method. Enter the following line inside the method.

• m_mmWaveOutputFilename = "example.txt";

• Find the ClassName::~ClassName() method and enter the folowing lines inside the method.

• if(m_mmWaveOutFile.is_open())

  {

        m_mmWaveOutFile.close();

     }

• Then find again the related method in “.cc” file and type

• if (!m_mmWaveOutFile.is_open ())

          {

                      m_mmWaveOutFile.open(m_mmWaveOutputFilename.c_str());

          }

• Lastly,  below the above codes type,

m_mmWaveOutFile << respectiveVariable << std::endl;



24 Ağustos 2018 Cuma 23:18:55 UTC+3 tarihinde Mukul Shukla yazdı: