139 lines
5.3 KiB
C++
139 lines
5.3 KiB
C++
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation;
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/**
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* Example program that demonstrates how to replace the time printer.
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*
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* This program creates a sample object and schedules some methods to
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* occur at future times. When run with no arguments, it prints out
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* something like this:
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* \code
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* $ ./waf --run sample-log-time-format
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* RandomVariableStream:RandomVariableStream(0x184e3a0)
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* RandomVariableStream:UniformRandomVariable(0x184e3a0)
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* RandomVariableStream:SetStream(0x184e3a0, -1)
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* RandomVariableStream:SetAntithetic(0x184e3a0, 0)
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* +0.000000001s RandomVariableStream:SetAntithetic(0x184e3a0, 0)
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* +0.000000123s RandomVariableStream:SetAntithetic(0x184e3a0, 0)
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* +0.000123456s RandomVariableStream:SetAntithetic(0x184e3a0, 0)
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* +0.123456789s RandomVariableStream:SetAntithetic(0x184e3a0, 0)
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* RandomVariableStream:~RandomVariableStream(0x184e3a0)
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* \endcode
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*
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* These statements are printed out because of these two program
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* statements:
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*
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* \code
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* LogComponentEnable ("RandomVariableStream", LOG_LEVEL_ALL);
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* LogComponentEnableAll (LOG_PREFIX_TIME);
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* \endcode
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*
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* The first statement enables logging on the methods found in
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* random-variable-stream.cc. The second prepends a time prefix
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* to logging statements. Note that only those logging statements
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* occurring after Simulator::Run () is called have a time prefix;
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* this is because the time printer is only hooked to the simulator
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* once the simulator object is instantiated (after Simulator::Run ()
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* is called).
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*
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* To change the format, one can schedule (at simulation time 0) a
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* replacement function for printing time. This can be demonstrated
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* by setting the 'replace-time-printer' parameter to true:
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* \code
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* ./waf --run 'sample-log-time-format --replaceTimePrinter=1'
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* RandomVariableStream:RandomVariableStream(0x15fb080)
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* RandomVariableStream:UniformRandomVariable(0x15fb080)
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* RandomVariableStream:SetStream(0x15fb080, -1)
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* RandomVariableStream:SetAntithetic(0x15fb080, 0)
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* Replacing time printer function after Simulator::Run ()
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* 1e-09s RandomVariableStream:SetAntithetic(0x15fb080, 0)
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* 1.23e-07s RandomVariableStream:SetAntithetic(0x15fb080, 0)
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* 0.000123456s RandomVariableStream:SetAntithetic(0x15fb080, 0)
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* 0.123457s RandomVariableStream:SetAntithetic(0x15fb080, 0)
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* RandomVariableStream:~RandomVariableStream(0x15fb080)
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* \endcode
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*
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* In the above, the default C++ iostream precision is instead used
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* (which was the default for ns-3 versions 3.26 and earlier).
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*
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* In addition, the 'resolution' program argument allows one to experiment
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* with changing ns-3's time resolution from its default of Time::NS, such
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* as Time::PS or Time::FS; the precision changes accordingly.
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*
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* The maximum useful precision is 20 decimal digits, since Time is
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* signed 64 bits.
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*/
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#include "ns3/simulator.h"
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#include "ns3/nstime.h"
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#include "ns3/command-line.h"
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#include "ns3/log.h"
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#include "ns3/random-variable-stream.h"
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using namespace ns3;
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// Prior to ns-3.26, the time printer used default C++ iostream precision
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// This function sets it back to the format used before ns-3.26
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void
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ReplacementTimePrinter (std::ostream &os)
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{
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os << Simulator::Now ().GetSeconds () << "s";
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}
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void
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ReplaceTimePrinter (void)
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{
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std::cout << "Replacing time printer function after Simulator::Run ()" << std::endl;
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LogSetTimePrinter (&ReplacementTimePrinter);
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}
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int main (int argc, char *argv[])
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{
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bool replaceTimePrinter = false;
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std::string resolution = "Time::NS";
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LogComponentEnable ("RandomVariableStream", LOG_LEVEL_ALL);
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LogComponentEnableAll (LOG_PREFIX_TIME);
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std::map<std::string, Time::Unit> resolutionMap = {{"Time::US", Time::US}, {"Time::NS", Time::NS}, {"Time::PS", Time::PS}, {"Time::FS", Time::FS}};
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CommandLine cmd;
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cmd.AddValue ("replaceTimePrinter", "replace time printing function", replaceTimePrinter);
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cmd.AddValue ("resolution", "time resolution", resolution);
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cmd.Parse (argc, argv);
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auto search = resolutionMap.find (resolution);
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if (search != resolutionMap.end ())
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{
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Time::SetResolution (search->second);
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}
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Ptr<UniformRandomVariable> uniformRv = CreateObject<UniformRandomVariable> ();
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if (replaceTimePrinter)
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{
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Simulator::Schedule (Seconds (0), &ReplaceTimePrinter);
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}
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Simulator::Schedule (NanoSeconds (1), &UniformRandomVariable::SetAntithetic, uniformRv, false);
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Simulator::Schedule (NanoSeconds (123), &UniformRandomVariable::SetAntithetic, uniformRv, false);
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Simulator::Schedule (NanoSeconds (123456), &UniformRandomVariable::SetAntithetic, uniformRv, false);
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Simulator::Schedule (NanoSeconds (123456789), &UniformRandomVariable::SetAntithetic, uniformRv, false);
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Simulator::Run ();
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Simulator::Destroy ();
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}
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