Schedule a function to run every x seconds during simulation

[SMalta]

Hello,

I want to run a specific function every X second during simulation time.

I have coded the below example, it works, but I would like to be advised if this is the best approach to do it? 

What are your opinions guys?

BR

smalta

***********************************************************

NS_LOG_COMPONENT_DEFINE ("Schedule");

 static void

 someEvent (Time interval)

 {

   NS_LOG_INFO ("event a time :" << Simulator::Now ().GetSeconds () );

   Simulator::Schedule (interval ,&someEvent, interval);

 }

 

int main(int argc, char *argv[])

{

  bool verbose = false;

   //Simulation Time In Seconds

  double SimTime = 10;

  uint32_t interval = 1;

  Time eventInterval = Seconds(interval);

  CommandLine cmd (__FILE__);

  cmd.AddValue("SimTime", "Simulation Time in Seconds", SimTime);

  cmd.AddValue("Interval", "Tell Function to run every X second", interval);

  cmd.AddValue("verbose", "Tell aplication to log if true", verbose);

 

  cmd.Parse (argc,argv);

  Time::SetResolution (Time::NS);

 

  if (verbose)

    {

      LogComponentEnableAll (LOG_PREFIX_TIME);

      LogComponentEnable ("Schedule", LOG_INFO);

    }

  eventInterval = Seconds(interval);

  Simulator::Schedule(Seconds(interval), &someEvent, eventInterval);

  Simulator::Stop (Seconds(SimTime));

  std::cout << "Simulation Time :" << SimTime << std::endl;

  Simulator::Run ();

 

  Simulator::Destroy ();

  return 0;

}

[Tom Henderson]

On 4/24/21 3:58 AM, SMalta wrote:

Hello,

I want to run a specific function every X second during simulation time.

I have coded the below example, it works, but I would like to be advised if this is the best approach to do it? 

What are your opinions guys?

This will work but there are possibly a few improvements (see inline below).

BR

smalta

***********************************************************

NS_LOG_COMPONENT_DEFINE ("Schedule");

 static void

 someEvent (Time interval)

 {

   NS_LOG_INFO ("event a time :" << Simulator::Now ().GetSeconds () );

   Simulator::Schedule (interval ,&someEvent, interval);

 }

 

int main(int argc, char *argv[])

{

  bool verbose = false;

   //Simulation Time In Seconds

  double SimTime = 10;

you can also declare this as:

  Time SimTime = Seconds (10);

There is no problem with using ns3::Time objects at the command line; in fact, there are some possible benefits because it naturally handles units, such as:

--SimTime=60s

or

--SimTime=1min

In general, we recommend to store time values in ns3::Time units where possible (and do arithmetic on them without converting back to basic types, if possible).

  uint32_t interval = 1;

declare this as:

  Time interval = Seconds (1);

  Time eventInterval = Seconds(interval);

There is no need for this variable if you declare 'interval' as a ns3::Time.

  CommandLine cmd (__FILE__);

  cmd.AddValue("SimTime", "Simulation Time in Seconds", SimTime);

  cmd.AddValue("Interval", "Tell Function to run every X second", interval);

  cmd.AddValue("verbose", "Tell aplication to log if true", verbose);

 

  cmd.Parse (argc,argv);

  Time::SetResolution (Time::NS);

The above is not strictly needed, as this is the default resolution.

 

  if (verbose)

    {

      LogComponentEnableAll (LOG_PREFIX_TIME);

      LogComponentEnable ("Schedule", LOG_INFO);

    }

  eventInterval = Seconds(interval);

  Simulator::Schedule(Seconds(interval), &someEvent, eventInterval);

The above two statements can then be compressed into one:

  Simulator::Schedule (interval, &someEvent, interval);

  Simulator::Stop (Seconds(SimTime));

This would become:

Simulator::Stop (SimTime);

  std::cout << "Simulation Time :" << SimTime << std::endl;

  Simulator::Run ();

 

  Simulator::Destroy ();

  return 0;

}

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[SMalta]

Ok Tom,

Many thanks for the advices.

I will follow them.

BR

Smalta