Base class for parallel algorithms that employ a systolic loop to generate all row pairs in parallel. More...

#include <systolic.h>

Inheritance diagram for madness::SystolicMatrixAlgorithm< T >:

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Collaboration diagram for madness::SystolicMatrixAlgorithm< T >:

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Public Member Functions
	SystolicMatrixAlgorithm (DistributedMatrix< T > &A, int tag, int nthread=ThreadPool::size()+1)
	A must be a column distributed matrix with an even column tile >= 2. More...

virtual	~SystolicMatrixAlgorithm ()

virtual bool	converged (const TaskThreadEnv &env) const =0
	Invoked simultaneously by all threads after each sweep to test for convergence. More...

virtual void	end_iteration_hook (const TaskThreadEnv &env)
	Invoked by all threads at the end of each iteration before convergence test. More...

int64_t	get_coldim () const
	Returns length of column. More...

ProcessID	get_rank () const
	Returns rank of this process in the world. More...

int64_t	get_rowdim () const
	Returns length of row. More...

World &	get_world () const
	Returns a reference to the world. More...

virtual void	kernel (int i, int j, T rowi, T rowj)=0
	Threadsafe routine to apply the operation to rows i and j of the matrix. More...

void	run (World &world, const TaskThreadEnv &env)
	Invoked by the task queue to run the algorithm with multiple threads. More...

void	solve_sequential ()
	Invoked by the user to run the algorithm with one thread mostly for debugging. More...

virtual void	start_iteration_hook (const TaskThreadEnv &env)
	Invoked by all threads at the start of each iteration. More...

Public Member Functions inherited from madness::TaskInterface
	TaskInterface (const TaskAttributes &attr)
	Create a new task with zero dependencies and given attributes. More...

	TaskInterface (int ndepend, const char *caller, const TaskAttributes attr=TaskAttributes())

	TaskInterface (int ndepend=0, const TaskAttributes attr=TaskAttributes())
	Create a new task with ndepend dependencies (default 0) and given attributes. More...

virtual	~TaskInterface ()

World *	get_world () const

virtual void	run (World &)
	Runs a single-threaded task ... derived classes must implement this. More...

Public Member Functions inherited from madness::PoolTaskInterface
	PoolTaskInterface ()
	Default constructor. More...

	PoolTaskInterface (const TaskAttributes &attr)

virtual	~PoolTaskInterface ()=default
	Destructor. More...

void	execute ()

void	set_nthread (int nthread)
	Call this to reset the number of threads before the task is submitted. More...

Public Member Functions inherited from madness::TaskAttributes
	TaskAttributes (const TaskAttributes &attr)
	Copy constructor. More...

	TaskAttributes (unsigned long flags=0)
	Sets the attributes to the desired values. More...

virtual	~TaskAttributes ()

int	get_nthread () const
	Get the number of threads. More...

bool	is_generator () const
	Test if the generator attribute is true. More...

bool	is_high_priority () const
	Test if the high priority attribute is true. More...

bool	is_stealable () const
	Test if the stealable attribute is true. More...

template<typename Archive >
void	serialize (Archive &ar)
	Serializes the attributes for I/O. More...

TaskAttributes &	set_generator (bool generator_hint)
	Sets the generator attribute. More...

TaskAttributes &	set_highpriority (bool hipri)
	Sets the high priority attribute. More...

void	set_nthread (int nthread)
	Set the number of threads. More...

TaskAttributes &	set_stealable (bool stealable)
	Sets the stealable attribute. More...

Public Member Functions inherited from madness::DependencyInterface
	DependencyInterface (int ndep, const char *caller)

	DependencyInterface (int ndep=0)

virtual	~DependencyInterface ()
	Destructor. More...

void	dec ()
	Decrement the number of dependencies and invoke the callback if `ndepend==0`. More...

void	dec_debug (const char *caller)

void	inc ()
	Increment the number of dependencies. More...

void	inc_debug (const char *caller)
	Same as inc(), but keeps track of `caller`; calling dec_debug() will signal error if no matching inc_debug() had been invoked More...

int	ndep () const
	Returns the number of unsatisfied dependencies. More...

void	notify ()
	Invoked by callbacks to notify of dependencies being satisfied. More...

void	notify_debug (const char *caller)
	Overload of CallbackInterface::notify_debug(), updates dec() More...

bool	probe () const
	Returns true if `ndepend == 0` (no unsatisfied dependencies). More...

void	register_callback (CallbackInterface *callback)
	Registers a callback that will be executed when `ndepend==0`; immediately invoked if `ndepend==0`. More...

void	register_final_callback (CallbackInterface *callback)
	Registers the final callback to be executed when `ndepend==0`; immediately invoked if `ndepend==0`. More...

Public Member Functions inherited from madness::CallbackInterface
virtual	~CallbackInterface ()

Private Member Functions
void	cycle ()
	Cycles data around the loop ... only one thread should invoke this. More...

virtual void	get_id (std::pair< void *, unsigned short > &id) const
	Get the task id. More...

void	iteration (const int nthread)

void	unshuffle ()
	Call this after iterating to restore correct order of rows in original matrix. More...

Private Attributes
DistributedMatrix< T > &	A

const int64_t	coldim
	A(coldim,rowdim) More...

std::vector< T * >	iptr

std::vector< T * >	jptr
	Indirection for implementing cyclic buffer !! SHOULD BE VOLATILE ????? More...

std::vector< int64_t >	map
	Used to keep track of actual row indices. More...

const int64_t	nlocal
	No. of local pairs. More...

const int64_t	nproc
	No. of processes with rows of the matrix (not size of world) More...

const ProcessID	rank
	Rank of current process. More...

const int64_t	rowdim
	A(coldim,rowdim) More...

const int	tag
	MPI tag to be used for messages. More...

Additional Inherited Members
Static Public Member Functions inherited from madness::TaskAttributes
static TaskAttributes	generator ()

static TaskAttributes	hipri ()

static TaskAttributes	multi_threaded (int nthread)

Static Public Attributes inherited from madness::TaskInterface
static bool	debug = false

Static Public Attributes inherited from madness::TaskAttributes
static const unsigned long	GENERATOR = 1ul<<8
	Mask for generator bit. More...

static const unsigned long	HIGHPRIORITY = GENERATOR<<2
	Mask for priority bit. More...

static const unsigned long	NTHREAD = 0xff
	Mask for nthread byte. More...

static const unsigned long	STEALABLE = GENERATOR<<1
	Mask for stealable bit. More...

Protected Member Functions inherited from madness::TaskInterface
virtual void	run (const TaskThreadEnv &env)
	Override this method to implement a multi-threaded task. More...

Protected Member Functions inherited from madness::CallbackInterface
virtual void	notify_debug_impl (const char *caller)

Static Protected Member Functions inherited from madness::PoolTaskInterface
template<typename fnobjT >
static std::enable_if<!(detail::function_traits< fnobjT >::value\|\|detail::memfunc_traits< fnobjT >::value) >::type	make_id (std::pair< void *, unsigned short > &id, const fnobjT &)

template<typename fnT >
static std::enable_if< detail::function_traits< fnT >::value\|\|detail::memfunc_traits< fnT >::value >::type	make_id (std::pair< void *, unsigned short > &id, fnT fn)

Detailed Description

template<typename T>
class madness::SystolicMatrixAlgorithm< T >

Base class for parallel algorithms that employ a systolic loop to generate all row pairs in parallel.

Constructor & Destructor Documentation

◆ SystolicMatrixAlgorithm()

template<typename T >

madness::SystolicMatrixAlgorithm< T >::SystolicMatrixAlgorithm	(	DistributedMatrix< T > &	A,
		int	tag,
		int	nthread = `ThreadPool::size()+1`
	)

inline

A must be a column distributed matrix with an even column tile >= 2.

It is assumed that it is the main thread invoking this.

Parameters

[in,out]	A	The matrix on which the algorithm is performed and modified in-place
[in]	tag	The MPI tag used for communication (obtain from `world.mpi.comm()`.unique_tag() )
[in]	nthread	The number of local threads to use (default is main thread all threads in the pool)

References madness::SystolicMatrixAlgorithm< T >::coldim, madness::SystolicMatrixAlgorithm< T >::iptr, madness::SystolicMatrixAlgorithm< T >::jptr, lo, MADNESS_ASSERT, madness::SystolicMatrixAlgorithm< T >::map, madness::SystolicMatrixAlgorithm< T >::nlocal, madness::SystolicMatrixAlgorithm< T >::nproc, p(), madness::SystolicMatrixAlgorithm< T >::rank, and madness::PoolTaskInterface::set_nthread().

◆ ~SystolicMatrixAlgorithm()

template<typename T >

virtual madness::SystolicMatrixAlgorithm< T >::~SystolicMatrixAlgorithm ( )

inlinevirtual

Member Function Documentation

◆ converged()

template<typename T >

virtual bool madness::SystolicMatrixAlgorithm< T >::converged ( const TaskThreadEnv & env ) const

pure virtual

Invoked simultaneously by all threads after each sweep to test for convergence.

There is a thread barrier before and after the invocation of this routine

Parameters

[in] env The madness thread environment in case synchronization between threads is needed during computation of the convergence condition.

Implemented in TestSystolicMatrixAlgorithm< T >, madness::SystolicPMOrbitalLocalize, and madness::SystolicFixOrbitalOrders.

◆ cycle()

template<typename T >

void madness::SystolicMatrixAlgorithm< T >::cycle ( )

inlineprivate

Cycles data around the loop ... only one thread should invoke this.

Referenced by madness::SystolicMatrixAlgorithm< T >::iteration().

◆ end_iteration_hook()

template<typename T >

virtual void madness::SystolicMatrixAlgorithm< T >::end_iteration_hook ( const TaskThreadEnv & env )

inlinevirtual

Invoked by all threads at the end of each iteration before convergence test.

There is a thread barrier before and after the invocation of this routine. Note that the converged() method is const whereas this can modify the class.

Parameters

[in] env The madness thread environment in case synchronization between threads is needed during startup.

Reimplemented in madness::SystolicPMOrbitalLocalize, and madness::SystolicFixOrbitalOrders.

Referenced by madness::SystolicMatrixAlgorithm< T >::iteration().

◆ get_coldim()

template<typename T >

int64_t madness::SystolicMatrixAlgorithm< T >::get_coldim ( ) const

inline

Returns length of column.

References madness::SystolicMatrixAlgorithm< T >::coldim.

◆ get_id()

template<typename T >

virtual void madness::SystolicMatrixAlgorithm< T >::get_id ( std::pair< void *, unsigned short > & id ) const

inlineprivatevirtual

Get the task id.

Parameters

id	The id to set for this task

Reimplemented from madness::PoolTaskInterface.

References madness::PoolTaskInterface::make_id().

◆ get_rank()

template<typename T >

ProcessID madness::SystolicMatrixAlgorithm< T >::get_rank ( ) const

inline

Returns rank of this process in the world.

References madness::SystolicMatrixAlgorithm< T >::rank.

◆ get_rowdim()

template<typename T >

int64_t madness::SystolicMatrixAlgorithm< T >::get_rowdim ( ) const

inline

Returns length of row.

References madness::SystolicMatrixAlgorithm< T >::rowdim.

◆ get_world()

template<typename T >

World& madness::SystolicMatrixAlgorithm< T >::get_world ( ) const

inline

Returns a reference to the world.

Referenced by madness::SystolicFixOrbitalOrders::end_iteration_hook(), and madness::SystolicPMOrbitalLocalize::end_iteration_hook().

◆ iteration()

template<typename T >

void madness::SystolicMatrixAlgorithm< T >::iteration ( const int nthread )

inlineprivate

Referenced by madness::SystolicMatrixAlgorithm< T >::run().

◆ kernel()

template<typename T >

virtual void madness::SystolicMatrixAlgorithm< T >::kernel	(	int	i,
		int	j,
		T *	rowi,
		T *	rowj
	)

pure virtual

Threadsafe routine to apply the operation to rows i and j of the matrix.

Parameters

[in]	i	First row index in the matrix
[in]	j	Second row index in the matrix
[in]	rowi	Pointer to row `i` of the matrix (to be modified by kernel in-place)
[in]	rowj	Pointer to row `j` of the matrix (to be modified by kernel in-place)

Implemented in TestSystolicMatrixAlgorithm< T >.

Referenced by madness::SystolicMatrixAlgorithm< T >::iteration().

◆ run()

template<typename T >

void madness::SystolicMatrixAlgorithm< T >::run	(	World &	world,
		const TaskThreadEnv &	env
	)

inlinevirtual

Invoked by the task queue to run the algorithm with multiple threads.

This is a collective call ... all processes in world should submit this task

Reimplemented from madness::TaskInterface.

References madness::SystolicMatrixAlgorithm< T >::iteration(), madness::TaskThreadEnv::nthread(), and madness::SystolicMatrixAlgorithm< T >::unshuffle().

Referenced by madness::SystolicMatrixAlgorithm< T >::solve_sequential().

◆ solve_sequential()

template<typename T >

void madness::SystolicMatrixAlgorithm< T >::solve_sequential ( )

inline

Invoked by the user to run the algorithm with one thread mostly for debugging.

This is a collective call ... all processes in world should call this routine.

References madness::SystolicMatrixAlgorithm< T >::run().

◆ start_iteration_hook()

template<typename T >

virtual void madness::SystolicMatrixAlgorithm< T >::start_iteration_hook ( const TaskThreadEnv & env )

inlinevirtual

Invoked by all threads at the start of each iteration.

There is a thread barrier before and after the invocation of this routine

Parameters

[in] env The madness thread environment in case synchronization between threads is needed during startup.

Reimplemented in TestSystolicMatrixAlgorithm< T >, madness::SystolicPMOrbitalLocalize, and madness::SystolicFixOrbitalOrders.

Referenced by madness::SystolicMatrixAlgorithm< T >::iteration().

◆ unshuffle()

template<typename T >

void madness::SystolicMatrixAlgorithm< T >::unshuffle ( )

inlineprivate

Call this after iterating to restore correct order of rows in original matrix.

At the end of each iteration the matrix rows are logically back in their correct order. However, due to indirection to reduce data motion, if the local column dimension is not a factor of the number of cycles the underlying data may be in a different order. This restores sanity.

Only one thread should invoke this routine

References madness::SystolicMatrixAlgorithm< T >::coldim, madness::BaseTensor::dims(), madness::SystolicMatrixAlgorithm< T >::iptr, madness::SystolicMatrixAlgorithm< T >::jptr, madness::SystolicMatrixAlgorithm< T >::nlocal, madness::SystolicMatrixAlgorithm< T >::nproc, madness::Tensor< T >::ptr(), madness::SystolicMatrixAlgorithm< T >::rank, madness::SystolicMatrixAlgorithm< T >::rowdim, madness::BaseTensor::size(), and T().