null-message-simulator-impl.h

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 *  Copyright 2013. Lawrence Livermore National Security, LLC.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author: Steven Smith <smith84@llnl.gov>
 *
 */

#ifndef NULLMESSAGE_SIMULATOR_IMPL_H
#define NULLMESSAGE_SIMULATOR_IMPL_H

#include <ns3/simulator-impl.h>
#include <ns3/scheduler.h>
#include <ns3/event-impl.h>
#include <ns3/ptr.h>

#include <list>
#include <iostream>
#include <fstream>

namespace ns3 {

class NullMessageEvent;
class NullMessageMpiInterface;
class RemoteChannelBundle;

class NullMessageSimulatorImpl : public SimulatorImpl
{
public:
  static TypeId GetTypeId (void);

  NullMessageSimulatorImpl ();

  ~NullMessageSimulatorImpl ();

  // virtual from SimulatorImpl
  virtual void Destroy ();
  virtual bool IsFinished (void) const;
  virtual void Stop (void);
  virtual void Stop (Time const &time);
  virtual EventId Schedule (Time const &time, EventImpl *event);
  virtual void ScheduleWithContext (uint32_t context, Time const &time, EventImpl *event);
  virtual EventId ScheduleNow (EventImpl *event);
  virtual EventId ScheduleDestroy (EventImpl *event);
  virtual void Remove (const EventId &ev);
  virtual void Cancel (const EventId &ev);
  virtual bool IsExpired (const EventId &ev) const;
  virtual void Run (void);
  virtual void RunOneEvent (void);
  virtual Time Now (void) const;
  virtual Time GetDelayLeft (const EventId &id) const;
  virtual Time GetMaximumSimulationTime (void) const;
  virtual void SetScheduler (ObjectFactory schedulerFactory);
  virtual uint32_t GetSystemId (void) const;
  virtual uint32_t GetContext (void) const;

  static NullMessageSimulatorImpl * GetInstance (void);

private:
  friend class NullMessageEvent;
  friend class NullMessageMpiInterface;
  friend class RemoteChannelBundleManager;

  void HandleArrivingMessagesNonBlocking (void);

  void HandleArrivingMessagesBlocking (void);

  virtual void DoDispose (void);

  void CalculateLookAhead (void);

  void ProcessOneEvent (void);

  Time Next (void) const;

  void CalculateSafeTime (void);

  Time GetSafeTime (void);

  void ScheduleNullMessageEvent (Ptr<RemoteChannelBundle> bundle);

  void RescheduleNullMessageEvent (Ptr<RemoteChannelBundle> bundle);

  void RescheduleNullMessageEvent (uint32_t nodeSysId);

  Time CalculateGuaranteeTime (uint32_t systemId);

  void NullMessageEventHandler(RemoteChannelBundle* bundle);

  typedef std::list<EventId> DestroyEvents;

  DestroyEvents m_destroyEvents;
  bool m_stop;
  Ptr<Scheduler> m_events;
  uint32_t m_uid;
  uint32_t m_currentUid;
  uint64_t m_currentTs;
  uint32_t m_currentContext;
  // number of events that have been inserted but not yet scheduled,
  // not counting the "destroy" events; this is used for validation
  int m_unscheduledEvents;

  uint32_t     m_myId;        // MPI Rank
  uint32_t     m_systemCount; // MPI Size

  /*
   * The time for which it is safe for this task to execute events
   * without danger of out-of-order events.
   */
  Time m_safeTime;

  /*
   * Null Message performance tuning parameter.  Controls when Null
   * messages are sent.  When value is 1 the minimum number of Null
   * messages are sent conserving bandwidth.  The delay in arrival of
   * lookahead information is the greatest resulting in maximum
   * unnecessary blocking of the receiver.  When the value is near 0
   * Null Messages are sent with high frequency, costing more
   * bandwidth and Null Message processing time, but there is minimum
   * unnecessary block of the receiver.
   */
  double m_schedulerTune;

  /*
   * Singleton instance.
   */
  static NullMessageSimulatorImpl* g_instance;
};

} // namespace ns3

#endif /* NULLMESSAGE_SIMULATOR_IMPL_H */