Distributed simulator implementation using lookahead. More...

#include "distributed-simulator-impl.h"

Inheritance diagram for ns3::DistributedSimulatorImpl:

Collaboration diagram for ns3::DistributedSimulatorImpl:

Public Member Functions
	DistributedSimulatorImpl ()
	Default constructor.

	~DistributedSimulatorImpl () override
	Destructor.

virtual void	BoundLookAhead (const Time lookAhead)
	Add additional bound to lookahead constraints.

void	Cancel (const EventId &id) override
	Set the cancel bit on this event: the event's associated function will not be invoked when it expires.

void	Destroy () override
	Execute the events scheduled with ScheduleDestroy().

uint32_t	GetContext () const override
	Get the current simulation context.

Time	GetDelayLeft (const EventId &id) const override
	Get the remaining time until this event will execute.

uint64_t	GetEventCount () const override
	Get the number of events executed.

Time	GetMaximumSimulationTime () const override
	Get the maximum representable simulation time.

uint32_t	GetSystemId () const override
	Get the system id of this simulator.

bool	IsExpired (const EventId &id) const override
	Check if an event has already run or been cancelled.

bool	IsFinished () const override
	Check if the simulation should finish.

Time	Now () const override
	Return the current simulation virtual time.

void	Remove (const EventId &id) override
	Remove an event from the event list.

void	Run () override
	Run the simulation.

EventId	Schedule (const Time &delay, EventImpl *event) override
	Schedule a future event execution (in the same context).

EventId	ScheduleDestroy (EventImpl *event) override
	Schedule an event to run at the end of the simulation, after the Stop() time or condition has been reached.

EventId	ScheduleNow (EventImpl *event) override
	Schedule an event to run at the current virtual time.

void	ScheduleWithContext (uint32_t context, const Time &delay, EventImpl *event) override
	Schedule a future event execution (in a different context).

void	SetScheduler (ObjectFactory schedulerFactory) override
	Set the Scheduler to be used to manage the event list.

void	Stop () override
	Tell the Simulator the calling event should be the last one executed.

EventId	Stop (const Time &delay) override
	Schedule the time delay until the Simulator should stop.

Public Member Functions inherited from ns3::SimulatorImpl
virtual void	PreEventHook (const EventId &id)
	Hook called before processing each event.

Public Member Functions inherited from ns3::Object
	Object ()
	Constructor.

	~Object () override
	Destructor.

void	AggregateObject (Ptr< Object > other)
	Aggregate two Objects together.

void	Dispose ()
	Dispose of this Object.

AggregateIterator	GetAggregateIterator () const
	Get an iterator to the Objects aggregated to this one.

TypeId	GetInstanceTypeId () const override
	Get the most derived TypeId for this Object.

template<typename T >
Ptr< T >	GetObject () const
	Get a pointer to the requested aggregated Object.

template<>
Ptr< Object >	GetObject () const
	Specialization of () for objects of type ns3::Object.

template<typename T >
Ptr< T >	GetObject (TypeId tid) const
	Get a pointer to the requested aggregated Object by TypeId.

template<>
Ptr< Object >	GetObject (TypeId tid) const
	Specialization of (TypeId tid) for objects of type ns3::Object.

void	Initialize ()
	Invoke DoInitialize on all Objects aggregated to this one.

bool	IsInitialized () const
	Check if the object has been initialized.

void	UnidirectionalAggregateObject (Ptr< Object > other)
	Aggregate an Object to another Object.

Public Member Functions inherited from ns3::SimpleRefCount< Object, ObjectBase, ObjectDeleter >
	SimpleRefCount ()
	Default constructor.

	SimpleRefCount (const SimpleRefCount &o)
	Copy constructor.

uint32_t	GetReferenceCount () const
	Get the reference count of the object.

SimpleRefCount &	operator= (const SimpleRefCount &o)
	Assignment operator.

void	Ref () const
	Increment the reference count.

void	Unref () const
	Decrement the reference count.

Public Member Functions inherited from ns3::ObjectBase
virtual	~ObjectBase ()
	Virtual destructor.

void	GetAttribute (std::string name, AttributeValue &value, bool permissive=false) const
	Get the value of an attribute, raising fatal errors if unsuccessful.

bool	GetAttributeFailSafe (std::string name, AttributeValue &value) const
	Get the value of an attribute without raising errors.

void	SetAttribute (std::string name, const AttributeValue &value)
	Set a single attribute, raising fatal errors if unsuccessful.

bool	SetAttributeFailSafe (std::string name, const AttributeValue &value)
	Set a single attribute without raising errors.

bool	TraceConnect (std::string name, std::string context, const CallbackBase &cb)
	Connect a TraceSource to a Callback with a context.

bool	TraceConnectWithoutContext (std::string name, const CallbackBase &cb)
	Connect a TraceSource to a Callback without a context.

bool	TraceDisconnect (std::string name, std::string context, const CallbackBase &cb)
	Disconnect from a TraceSource a Callback previously connected with a context.

bool	TraceDisconnectWithoutContext (std::string name, const CallbackBase &cb)
	Disconnect from a TraceSource a Callback previously connected without a context.

Static Public Member Functions
static TypeId	GetTypeId ()
	Register this type.

Static Public Member Functions inherited from ns3::SimulatorImpl
static TypeId	GetTypeId ()
	Get the registered TypeId for this class.

Static Public Member Functions inherited from ns3::Object
static TypeId	GetTypeId ()
	Register this type.

Static Public Member Functions inherited from ns3::ObjectBase
static TypeId	GetTypeId ()
	Get the type ID.

Private Types
typedef std::list< EventId >	DestroyEvents
	Container type for the events to run at Simulator::Destroy().

Private Member Functions
void	CalculateLookAhead ()
	Calculate lookahead constraint based on network latency.

void	DoDispose () override
	Destructor implementation.

bool	IsLocalFinished () const
	Check if this rank is finished.

Time	Next () const
	Get the time of the next event, as returned by NextTs().

uint64_t	NextTs () const
	Get the timestep of the next event.

void	ProcessOneEvent ()
	Process the next event.

Private Attributes
uint32_t	m_currentContext
	Execution context of the current event.

uint64_t	m_currentTs
	Timestamp of the current event.

uint32_t	m_currentUid
	Unique id of the current event.

DestroyEvents	m_destroyEvents
	The container of events to run at Destroy()

uint64_t	m_eventCount
	The event count.

Ptr< Scheduler >	m_events
	The event priority queue.

bool	m_globalFinished
	Are all parallel instances completed.

Time	m_grantedTime
	End of current window.

uint32_t	m_myId
	MPI rank.

LbtsMessage *	m_pLBTS
	Container for Lbts messages, one per rank.

bool	m_stop
	Flag calling for the end of the simulation.

uint32_t	m_systemCount
	MPI communicator size.

uint32_t	m_uid
	Next event unique id.

int	m_unscheduledEvents
	Number of events that have been inserted but not yet scheduled, not counting the "destroy" events; this is used for validation.

Static Private Attributes
static Time	m_lookAhead = Time::Max()
	Current window size.

Additional Inherited Members
Protected Member Functions inherited from ns3::Object
	Object (const Object &o)
	Copy an Object.

virtual void	DoInitialize ()
	Initialize() implementation.

virtual void	NotifyNewAggregate ()
	Notify all Objects aggregated to this one of a new Object being aggregated.

Protected Member Functions inherited from ns3::ObjectBase
void	ConstructSelf (const AttributeConstructionList &attributes)
	Complete construction of ObjectBase; invoked by derived classes.

virtual void	NotifyConstructionCompleted ()
	Notifier called once the ObjectBase is fully constructed.

Related Symbols inherited from ns3::ObjectBase
static TypeId	GetObjectIid ()
	Ensure the TypeId for ObjectBase gets fully configured to anchor the inheritance tree properly.

Detailed Description

Distributed simulator implementation using lookahead.

Definition at line 96 of file distributed-simulator-impl.h.

Member Typedef Documentation

◆ DestroyEvents

typedef std::list<EventId> ns3::DistributedSimulatorImpl::DestroyEvents

private

Container type for the events to run at Simulator::Destroy().

Definition at line 185 of file distributed-simulator-impl.h.

Constructor & Destructor Documentation

◆ DistributedSimulatorImpl()

ns3::DistributedSimulatorImpl::DistributedSimulatorImpl ( )

Default constructor.

Definition at line 90 of file distributed-simulator-impl.cc.

References ns3::MpiInterface::GetSize(), ns3::MpiInterface::GetSystemId(), ns3::EventId::INVALID, m_currentContext, m_currentTs, m_currentUid, m_eventCount, m_events, m_globalFinished, m_grantedTime, m_myId, m_pLBTS, m_stop, m_systemCount, m_uid, m_unscheduledEvents, ns3::Simulator::NO_CONTEXT, NS_LOG_FUNCTION, ns3::Seconds(), and ns3::EventId::VALID.

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◆ ~DistributedSimulatorImpl()

ns3::DistributedSimulatorImpl::~DistributedSimulatorImpl ( )

override

Destructor.

Definition at line 112 of file distributed-simulator-impl.cc.

References NS_LOG_FUNCTION.

Member Function Documentation

◆ BoundLookAhead()

void ns3::DistributedSimulatorImpl::BoundLookAhead ( const Time lookAhead )

virtual

Add additional bound to lookahead constraints.

This may be used if there are additional constraints on lookahead in addition to the minimum inter rank latency time. For example when running ns-3 in a co-simulation setting the other simulators may have tighter lookahead constraints.

The method may be invoked more than once, the minimum time will be used to constrain lookahead.

Parameters

[in] lookAhead The maximum lookahead; must be > 0.

Definition at line 263 of file distributed-simulator-impl.cc.

References m_lookAhead, Min, NS_LOG_FUNCTION, and NS_LOG_WARN.

◆ CalculateLookAhead()

void ns3::DistributedSimulatorImpl::CalculateLookAhead ( )

private

Calculate lookahead constraint based on network latency.

The smallest cross-rank PointToPoint channel delay imposes a constraint on the conservative PDES time window. The user may impose additional constraints on lookahead using the ConstrainLookAhead() method.

Definition at line 152 of file distributed-simulator-impl.cc.

References ns3::NodeContainer::Begin(), ns3::NodeContainer::End(), ns3::TimeValue::Get(), ns3::MpiInterface::GetCommunicator(), ns3::NodeContainer::GetGlobal(), ns3::Time::GetInteger(), GetMaximumSimulationTime(), ns3::MpiInterface::GetSize(), ns3::MpiInterface::GetSystemId(), m_grantedTime, m_lookAhead, NS_LOG_FUNCTION, and ns3::Seconds().

Referenced by Run().

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◆ Cancel()

void ns3::DistributedSimulatorImpl::Cancel ( const EventId & id )

overridevirtual

Set the cancel bit on this event: the event's associated function will not be invoked when it expires.

This method has the same visible effect as the ns3::Simulator::Remove method but its algorithmic complexity is much lower: it has O(1) complexity. This method has the exact same semantics as ns3::EventId::Cancel. Note that it is not possible to cancel events which were scheduled for the "destroy" time. Doing so will result in a program error (crash).

Parameters

[in] id the event to cancel

Implements ns3::SimulatorImpl.

Definition at line 573 of file distributed-simulator-impl.cc.

References IsExpired().

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◆ Destroy()

void ns3::DistributedSimulatorImpl::Destroy ( )

overridevirtual

Execute the events scheduled with ScheduleDestroy().

This method is typically invoked at the end of a simulation to avoid false-positive reports by a leak checker. After this method has been invoked, it is actually possible to restart a new simulation with a set of calls to Simulator::Run, Simulator::Schedule and Simulator::ScheduleWithContext.

Implements ns3::SimulatorImpl.

Definition at line 133 of file distributed-simulator-impl.cc.

References ns3::MpiInterface::Destroy(), m_destroyEvents, NS_LOG_FUNCTION, and NS_LOG_LOGIC.

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◆ DoDispose()

void ns3::DistributedSimulatorImpl::DoDispose ( )

overrideprivatevirtual

Destructor implementation.

This method is called by Dispose() or by the Object's destructor, whichever comes first.

Subclasses are expected to implement their real destruction code in an overridden version of this method and chain up to their parent's implementation once they are done. i.e, for simplicity, the destructor of every subclass should be empty and its content should be moved to the associated DoDispose() method.

It is safe to call GetObject() from within this method.

Reimplemented from ns3::Object.

Definition at line 118 of file distributed-simulator-impl.cc.

References ns3::Object::DoDispose(), ns3::Scheduler::Event::impl, m_events, m_pLBTS, NS_LOG_FUNCTION, and ns3::SimpleRefCount< T, PARENT, DELETER >::Unref().

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◆ GetContext()

uint32_t ns3::DistributedSimulatorImpl::GetContext ( ) const

overridevirtual

Get the current simulation context.

The simulation context is the ns-3 notion of a Logical Process. Events in a single context should only modify state associated with that context. Events for objects in other contexts should be scheduled with ScheduleWithContext() to track the context switches. In other words, events in different contexts should be mutually thread safe, by not modify overlapping model state.

In circumstances where the context can't be determined, such as during object initialization, the enum value NO_CONTEXT should be used.

Returns: The current simulation context

Implements ns3::SimulatorImpl.

Definition at line 614 of file distributed-simulator-impl.cc.

References m_currentContext.

Referenced by Schedule().

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◆ GetDelayLeft()

Time ns3::DistributedSimulatorImpl::GetDelayLeft ( const EventId & id ) const

overridevirtual

Get the remaining time until this event will execute.

Parameters

[in] id The event id to analyse.

Returns: The delay left until the input event id expires. if the event is not running, this method returns zero.

Implements ns3::SimulatorImpl.

Definition at line 527 of file distributed-simulator-impl.cc.

References IsExpired(), and m_currentTs.

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◆ GetEventCount()

uint64_t ns3::DistributedSimulatorImpl::GetEventCount ( ) const

overridevirtual

Get the number of events executed.

Returns: The total number of events executed.

Implements ns3::SimulatorImpl.

Definition at line 620 of file distributed-simulator-impl.cc.

References m_eventCount.

◆ GetMaximumSimulationTime()

Time ns3::DistributedSimulatorImpl::GetMaximumSimulationTime ( ) const

overridevirtual

Get the maximum representable simulation time.

Returns: The maximum simulation time at which an event can be scheduled.

The returned value will always be bigger than or equal to Simulator::Now.

Todo: I am fairly certain other compilers use other non-standard post-fixes to indicate 64 bit constants.

Implements ns3::SimulatorImpl.

Definition at line 606 of file distributed-simulator-impl.cc.

Referenced by CalculateLookAhead(), NextTs(), and Run().

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◆ GetSystemId()

uint32_t ns3::DistributedSimulatorImpl::GetSystemId ( ) const

overridevirtual

Get the system id of this simulator.

The system id is the identifier for this simulator instance in a distributed simulation. For MPI this is the MPI rank.

Returns: The system id for this simulator.

Implements ns3::SimulatorImpl.

Definition at line 443 of file distributed-simulator-impl.cc.

References m_myId.

◆ GetTypeId()

TypeId ns3::DistributedSimulatorImpl::GetTypeId ( )

static

Register this type.

Returns: The object TypeId.

Definition at line 81 of file distributed-simulator-impl.cc.

References ns3::TypeId::SetParent().

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◆ IsExpired()

bool ns3::DistributedSimulatorImpl::IsExpired ( const EventId & id ) const

overridevirtual

Check if an event has already run or been cancelled.

This method has O(1) complexity. Note that it is not possible to test for the expiration of events which were scheduled for the "destroy" time. Doing so will result in a program error (crash). An event is said to "expire" when it starts being executed, which means that if the code executed by the event calls this function, it will get true.

Parameters

[in] id The event to test for expiration.

Returns: true if the event has expired, false otherwise.

Implements ns3::SimulatorImpl.

Definition at line 582 of file distributed-simulator-impl.cc.

References ns3::EventId::DESTROY, m_currentTs, m_currentUid, and m_destroyEvents.

Referenced by Cancel(), GetDelayLeft(), and Remove().

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◆ IsFinished()

bool ns3::DistributedSimulatorImpl::IsFinished ( ) const

overridevirtual

Check if the simulation should finish.

Reasons to finish are because there are no more events lefts to be scheduled, or if simulation time has already reached the "stop time" (see Simulator::Stop()).

Returns: true if no more events or stop time reached.

Implements ns3::SimulatorImpl.

Definition at line 316 of file distributed-simulator-impl.cc.

References m_globalFinished.

◆ IsLocalFinished()

bool ns3::DistributedSimulatorImpl::IsLocalFinished ( ) const

private

Check if this rank is finished.

It's finished when there are no more events or stop has been requested.

Returns: true when this rank is finished.

Definition at line 322 of file distributed-simulator-impl.cc.

References m_events, and m_stop.

Referenced by NextTs(), and Run().

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◆ Next()

Time ns3::DistributedSimulatorImpl::Next ( ) const

private

Get the time of the next event, as returned by NextTs().

Returns: The next event time stamp.

Definition at line 344 of file distributed-simulator-impl.cc.

References NextTs().

Referenced by Run().

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◆ NextTs()

uint64_t ns3::DistributedSimulatorImpl::NextTs ( ) const

private

Get the timestep of the next event.

If there are no more events the timestep is infinity.

Returns: The next event timestep.

Definition at line 328 of file distributed-simulator-impl.cc.

References GetMaximumSimulationTime(), ns3::Time::GetTimeStep(), IsLocalFinished(), ns3::Scheduler::Event::key, m_events, and ns3::Scheduler::EventKey::m_ts.

Referenced by Next().

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◆ Now()

Time ns3::DistributedSimulatorImpl::Now ( ) const

overridevirtual

Return the current simulation virtual time.

Returns: The current virtual time.

Implements ns3::SimulatorImpl.

Definition at line 521 of file distributed-simulator-impl.cc.

References m_currentTs.

◆ ProcessOneEvent()

void ns3::DistributedSimulatorImpl::ProcessOneEvent ( )

private

Process the next event.

Definition at line 295 of file distributed-simulator-impl.cc.

References ns3::Scheduler::Event::impl, ns3::EventImpl::Invoke(), ns3::Scheduler::Event::key, ns3::Scheduler::EventKey::m_context, m_currentContext, m_currentTs, m_currentUid, m_eventCount, m_events, ns3::Scheduler::EventKey::m_ts, ns3::Scheduler::EventKey::m_uid, m_unscheduledEvents, NS_ASSERT, NS_LOG_FUNCTION, NS_LOG_LOGIC, ns3::SimulatorImpl::PreEventHook(), and ns3::SimpleRefCount< T, PARENT, DELETER >::Unref().

Referenced by Run().

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◆ Remove()

void ns3::DistributedSimulatorImpl::Remove ( const EventId & id )

overridevirtual

Remove an event from the event list.

This method has the same visible effect as the ns3::EventId::Cancel method but its algorithmic complexity is much higher: it has often O(log(n)) complexity, sometimes O(n), sometimes worse. Note that it is not possible to remove events which were scheduled for the "destroy" time. Doing so will result in a program error (crash).

Parameters

[in] id The event to remove from the list of scheduled events.

Implements ns3::SimulatorImpl.

Definition at line 540 of file distributed-simulator-impl.cc.

References ns3::EventImpl::Cancel(), ns3::EventId::DESTROY, ns3::Scheduler::Event::impl, IsExpired(), m_destroyEvents, m_events, and m_unscheduledEvents.

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◆ Run()

void ns3::DistributedSimulatorImpl::Run ( )

overridevirtual

Run the simulation.

The simulation will run until one of:

No events are present anymore
The user called Simulator::Stop
The user called Simulator::Stop with a stop time and the expiration time of the next event to be processed is greater than or equal to the stop time.

Implements ns3::SimulatorImpl.

Definition at line 350 of file distributed-simulator-impl.cc.

References CalculateLookAhead(), ns3::MpiInterface::GetCommunicator(), GetMaximumSimulationTime(), ns3::GrantedTimeWindowMpiInterface::GetRxCount(), ns3::LbtsMessage::GetRxCount(), ns3::LbtsMessage::GetSmallestTime(), ns3::GrantedTimeWindowMpiInterface::GetTxCount(), ns3::LbtsMessage::GetTxCount(), ns3::LbtsMessage::IsFinished(), IsLocalFinished(), m_events, m_globalFinished, m_grantedTime, m_lookAhead, m_myId, m_pLBTS, m_stop, m_systemCount, m_unscheduledEvents, Next(), NS_ASSERT, NS_LOG_FUNCTION, ProcessOneEvent(), ns3::GrantedTimeWindowMpiInterface::ReceiveMessages(), and ns3::GrantedTimeWindowMpiInterface::TestSendComplete().

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◆ Schedule()

EventId ns3::DistributedSimulatorImpl::Schedule	(	const Time &	delay,
		EventImpl *	event )

overridevirtual

Schedule a future event execution (in the same context).

Parameters

[in]	delay	Delay until the event expires.
[in]	event	The event to schedule.

Returns: A unique identifier for the newly-scheduled event.

Implements ns3::SimulatorImpl.

Definition at line 468 of file distributed-simulator-impl.cc.

References GetContext(), ns3::Time::GetTimeStep(), ns3::Scheduler::Event::impl, ns3::Time::IsPositive(), ns3::Scheduler::Event::key, ns3::Scheduler::EventKey::m_context, m_currentTs, m_events, ns3::Scheduler::EventKey::m_ts, m_uid, ns3::Scheduler::EventKey::m_uid, m_unscheduledEvents, NS_ASSERT, and NS_LOG_FUNCTION.

Referenced by ScheduleNow().

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◆ ScheduleDestroy()

EventId ns3::DistributedSimulatorImpl::ScheduleDestroy ( EventImpl * event )

overridevirtual

Schedule an event to run at the end of the simulation, after the Stop() time or condition has been reached.

Parameters

[in] event The event to schedule.

Returns: A unique identifier for the newly-scheduled event.

Implements ns3::SimulatorImpl.

Definition at line 510 of file distributed-simulator-impl.cc.

References m_currentTs, m_destroyEvents, m_uid, and NS_LOG_FUNCTION.

◆ ScheduleNow()

EventId ns3::DistributedSimulatorImpl::ScheduleNow ( EventImpl * event )

overridevirtual

Schedule an event to run at the current virtual time.

Parameters

[in] event The event to schedule.

Returns: A unique identifier for the newly-scheduled event.

Implements ns3::SimulatorImpl.

Definition at line 503 of file distributed-simulator-impl.cc.

References NS_LOG_FUNCTION, and Schedule().

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◆ ScheduleWithContext()

void ns3::DistributedSimulatorImpl::ScheduleWithContext	(	uint32_t	context,
		const Time &	delay,
		EventImpl *	event )

overridevirtual

Schedule a future event execution (in a different context).

This method is thread-safe: it can be called from any thread.

Parameters

[in]	delay	Delay until the event expires.
[in]	context	Event context.
[in]	event	The event to schedule.

Implements ns3::SimulatorImpl.

Definition at line 488 of file distributed-simulator-impl.cc.

References ns3::Time::GetTimeStep(), ns3::Scheduler::Event::impl, ns3::Scheduler::Event::key, ns3::Scheduler::EventKey::m_context, m_currentTs, m_events, ns3::Scheduler::EventKey::m_ts, m_uid, ns3::Scheduler::EventKey::m_uid, m_unscheduledEvents, and NS_LOG_FUNCTION.

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◆ SetScheduler()

void ns3::DistributedSimulatorImpl::SetScheduler ( ObjectFactory schedulerFactory )

overridevirtual

Set the Scheduler to be used to manage the event list.

Parameters

[in] schedulerFactory A new event scheduler factory.

The event scheduler can be set at any time: the events scheduled in the previous scheduler will be transferred to the new scheduler before we start to use it.

Implements ns3::SimulatorImpl.

Definition at line 277 of file distributed-simulator-impl.cc.

References ns3::ObjectFactory::Create(), m_events, and NS_LOG_FUNCTION.

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◆ Stop() [1/2]

void ns3::DistributedSimulatorImpl::Stop ( )

overridevirtual

Tell the Simulator the calling event should be the last one executed.

If a running event invokes this method, it will be the last event executed by the Simulator::Run method before returning to the caller.

Implements ns3::SimulatorImpl.

Definition at line 449 of file distributed-simulator-impl.cc.

References m_stop, and NS_LOG_FUNCTION.

◆ Stop() [2/2]

EventId ns3::DistributedSimulatorImpl::Stop ( const Time & delay )

overridevirtual

Schedule the time delay until the Simulator should stop.

Force the Simulator::Run method to return to the caller when the expiration time of the next event to be processed is greater than or equal to the stop time. The stop time is relative to the current simulation time.

Parameters

[in] delay The stop time, relative to the current time.