skepu::Matrix< T > Class Template Reference

A matrix container class (2D matrix), internally uses 1D container (std::vector) to store elements in a contiguous memory allocations. More...

#include <matrix.h>

List of all members.

Classes
class	iterator
	An matrix iterator class that tranverses row-wise. More...
class	proxy_elem
	A proxy class representing one element of Matrix. More...
Public Member Functions
T *	GetArrayRep ()
void	randomize (int min=0, int max=RAND_MAX)
	Randomizes the Matrix.
void	save (const std::string &filename)
	Saves content of Matrix to a file.
void	load (const std::string &filename, int rowWidth, int numRows=0)
	Loads the Matrix from a file.
	~Matrix ()
	Matrix (size_type _rows, size_type _cols)
	Matrix (size_type _rows, size_type _cols, const T &val)
	Matrix (const Matrix< T > &copy)
size_type	size () const
size_type	total_rows () const
size_type	total_cols () const
void	change_layout ()
void	resize (size_type _rows, size_type _cols, T val=T())
Matrix< T > &	operator= (Matrix< T > &other)
Matrix< T > &	operator= (const T &elem)
bool	operator== (const Matrix< T > &c1)
bool	operator!= (const Matrix< T > &c1)
bool	operator< (const Matrix< T > &c1)
bool	operator> (const Matrix< T > &c1)
bool	operator<= (const Matrix< T > &c1)
bool	operator>= (const Matrix< T > &c1)
Matrix< T > &	subsection (size_type row, size_type col, size_type rowWidth, size_type colWidth)
iterator	begin ()
const_iterator	begin () const
iterator	begin (unsigned row)
const_iterator	begin (unsigned row) const
iterator	end ()
const_iterator	end () const
iterator	end (unsigned row)
const_iterator	end (unsigned row) const
size_type	capacity () const
void	flush ()
bool	empty () const
proxy_elem	at (size_type row, size_type col)
const T &	at (size_type row, size_type col) const
size_type	row_back (size_type row)
const T &	row_back (size_type row) const
size_type	row_front (size_type row)
const T &	row_front (size_type row) const
proxy_elem	col_back (size_type col)
const T &	col_back (size_type col) const
proxy_elem	col_front (size_type col)
const T &	col_front (size_type col) const
void	clear ()
void	swap (Matrix< T > &from)
device_pointer_type_cl	updateDevice_CL (T *start, size_type rows, size_type cols, Device_CL *device, bool copy)
	Update device with matrix content.
device_pointer_type_cl	updateDevice_CL (T *start, size_type cols, Device_CL *device, bool copy)
	Update device with matrix content.
void	flush_CL ()
	Flushes the matrix.
device_pointer_type_cu	updateDevice_CU (T *start, size_type rows, size_type cols, int deviceID, bool copy, bool usePitch=false)
	Update device with matrix content.
device_pointer_type_cu	updateDevice_CU (T *start, size_type cols, int deviceID, bool copy)
	Update device with matrix content.
void	flush_CU ()
	Flushes the matrix.
const T &	operator() (const size_type row, const size_type col) const
T &	operator() (const size_type row, const size_type col)
T &	operator() (const size_type index)
const T &	operator[] (const size_type index) const
T &	operator[] (const size_type index)
void	transpose_CPU ()
	A method to take Matrix transpose on CPU backend.
void	transpose_OMP ()
	A method to take Matrix transpose on OpenMP backend.
void	transpose_CU (Device_CU *device)
	A method to take Matrix transpose on CUDA backend. Always uses 1 CUDA GPU for transpose even if multiple GPUs are available.
void	transpose_CL (int deviceID)
	A method to take Matrix transpose on OpenCL backend. Always uses 1 OpenCL device for transpose even if multiple OpenCL devices are available.
void	updateHost () const
void	invalidateDevice ()
void	updateHostAndInvalidateDevice ()
const Matrix< T > &	operator+= (const Matrix< T > &rhs)
const Matrix< T > &	operator+= (const T &rhs)
const Matrix< T > &	operator-= (const Matrix< T > &rhs)
const Matrix< T > &	operator-= (const T &rhs)
const Matrix< T > &	operator*= (const Matrix< T > &rhs)
const Matrix< T > &	operator*= (const T &rhs)
const Matrix< T > &	operator/= (const Matrix< T > &rhs)
const Matrix< T > &	operator/= (const T &rhs)
const Matrix< T > &	operator%= (const Matrix< T > &rhs)
const Matrix< T > &	operator%= (const T &rhs)
Friends
std::ostream &	operator<< (std::ostream &os, Matrix< T > &matrix)
	Overloaded stream operator, for testing purposes.

---

Detailed Description

template<typename T>
class skepu::Matrix< T >

A matrix container class (2D matrix), internally uses 1D container (std::vector) to store elements in a contiguous memory allocations.

A skepu::Matrix is a 2D container that internally stores in a 1D std::vector to store elements in a contiguous memory allocations. Its interface and behaviour is largely compatible with skepu::Vector and std::vector but with some additions and variations. Instead of the regular element, it sometimes returns a proxy element so it can distinguish between reads and writes. It also keeps track of which parts of it are currently allocated and uploaded to the GPU. If a computation is done, changing the matrix in the GPU memory, it is not directly transferred back to the host memory. Instead, the Matrix waits until an element is accessed before any copying is done.

It also implements support for allocating and de-allocating page-locked memory using cudaMallocHost and cudaFreeHost. This could help is running asynchronous operations especially when using multiple CUDA devices. It can be enabled by defining USE_PINNED_MEMORY flag in the skeleton program.

---

Constructor & Destructor Documentation

template<typename T>

skepu::Matrix< T >::~Matrix

(

)

[inline]

Destructor, used to deallocate memory mainly, device memory.

template<typename T>

skepu::Matrix< T >::Matrix	(	size_type	_rows,
		size_type	_cols
	)		[inline]

Constructor, used to allocate memory ($_rows * _cols$).

Parameters:

_rows	Number of rows in the matrix.
_cols	Number of columns in the matrix.

template<typename T>

skepu::Matrix< T >::Matrix	(	size_type	_rows,
		size_type	_cols,
		const T &	val
	)		[inline]

Constructor, used to allocate memory ($_rows * _cols$). With a value ot initialize all elements.

Parameters:

_rows	Number of rows in the matrix.
_cols	Number of columns in the matrix.
val	A value to initialize all elements.

template<typename T>

skepu::Matrix< T >::Matrix

(

const Matrix< T > &

copy

)

[inline]

Copy Constructor, used to assign copy of another matrix.

Parameters:

copy	Matrix that is being assigned.

Update the matrix before assigning it to assign latest copy.

References skepu::Matrix< T >::updateHost().

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Member Function Documentation

template<typename T >

Matrix< T >::proxy_elem skepu::Matrix< T >::at	(	size_type	row,
		size_type	col
	)

Please refer to the documentation of std::vector.

Returns a proxy_elem instead of an ordinary element. The proxy_elem usually behaves like an ordinary, but there might be exceptions.

template<typename T >

const T & skepu::Matrix< T >::at	(	size_type	row,
		size_type	col
	)		const

Please refer to the documentation of std::vector. Uses row and col instead of single index.

Parameters:

row	Index of row to get.
col	Index of column to get.

Returns:

a const reference to T element at position identified by row,column index.

template<typename T >

Matrix< T >::const_iterator skepu::Matrix< T >::begin

(

)

const

Please refer to the documentation of std::vector and skepu::Matrix::iterator.

template<typename T >

Matrix< T >::iterator skepu::Matrix< T >::begin

(

unsigned

row

)

Please refer to the documentation of std::vector and skepu::Matrix::iterator. Uses row to get an iterator for that row.

Parameters:

row	The index of row from where to start iterator.

template<typename T >

Matrix< T >::const_iterator skepu::Matrix< T >::begin

(

unsigned

row

)

const

Please refer to the documentation of std::vector and skepu::Matrix::iterator. Uses row to get an iterator for that row.

Parameters:

row	The index of row from where to start iterator.

template<typename T >

Matrix< T >::iterator skepu::Matrix< T >::begin

(

)

Please refer to the documentation of std::vector and skepu::Matrix::iterator.

template<typename T >

Matrix< T >::size_type skepu::Matrix< T >::capacity

(

)

const

Please refer to the documentation of std::vector.

template<typename T>

void skepu::Matrix< T >::change_layout

(

)

[inline]

A small utility to change rows and columns numbers with each other. A Matrix (4x7) will become (7x4) after this function call without changing the actual values. Not similar to transpose where you actually change the values.

template<typename T >

void skepu::Matrix< T >::clear

(

)

Please refer to the documentation of std::vector. Invalidates all copies before clear.

template<typename T >

Matrix< T >::proxy_elem skepu::Matrix< T >::col_back

(

size_type

col

)

Returns proxy of last element in column.

Returns a proxy_elem instead of an ordinary element. The proxy_elem usually behaves like an ordinary, but there might be exceptions. col Index of the column.

template<typename T >

const T & skepu::Matrix< T >::col_back

(

size_type

col

)

const

Returns last element in column.

col Index of the column.

template<typename T >

Matrix< T >::proxy_elem skepu::Matrix< T >::col_front

(

size_type

col

)

Returns proxy of first element in column.

Returns a proxy_elem instead of an ordinary element. The proxy_elem usually behaves like an ordinary, but there might be exceptions. col Index of the column.

template<typename T >

const T & skepu::Matrix< T >::col_front

(

size_type

col

)

const

Returns last element in column.

col Index of the column.

template<typename T >

bool skepu::Matrix< T >::empty

(

)

const

Please refer to the documentation of std::vector.

template<typename T >

Matrix< T >::const_iterator skepu::Matrix< T >::end

(

)

const

Please refer to the documentation of std::vector and skepu::Matrix::iterator.

template<typename T >

Matrix< T >::iterator skepu::Matrix< T >::end

(

unsigned

row

)

Please refer to the documentation of std::vector and skepu::Matrix::iterator. Get iterator to last element of row.

Parameters:

row	Index of row the iterator will point to the last element.

template<typename T >

Matrix< T >::const_iterator skepu::Matrix< T >::end

(

unsigned

row

)

const

Please refer to the documentation of std::vector and skepu::Matrix::iterator. Get iterator to last element of row.

Parameters:

row	Index of row the iterator will point to the last element.

template<typename T >

Matrix< T >::iterator skepu::Matrix< T >::end

(

)

Please refer to the documentation of std::vector and skepu::Matrix::iterator.

template<typename T >

void skepu::Matrix< T >::flush

(

)

Flushes the matrix, synchronizing it with the device then release all device allocations.

template<typename T >

void skepu::Matrix< T >::flush_CL

(

)

Flushes the matrix.

First it updates the matrix from all its device allocations, then it releases all allocations.

template<typename T >

void skepu::Matrix< T >::flush_CU

(

)

Flushes the matrix.

First it updates the matrix from all its device allocations, then it releases all allocations.

template<typename T>

T* skepu::Matrix< T >::GetArrayRep

(

)

[inline]

Get array representation

template<typename T >

void skepu::Matrix< T >::invalidateDevice

(

)

[inline]

Invalidates all device data that this matrix has allocated.

template<typename T>

void skepu::Matrix< T >::load	(	const std::string &	filename,
		int	rowWidth,
		int	numRows = 0
	)		[inline]

Loads the Matrix from a file.

Reads a variable number of elements from a file. In the file, all elemets should be in ASCII on one line with whitespace between each element. Mainly for testing purposes.

Parameters:

filename	Name of file to save to.
rowWidth	The width of a row. All rows get same amount of width.
numRows	The number of rows to be loaded. Default value 0 means all rows.

References skepu::Matrix< T >::clear(), skepu::Matrix< T >::invalidateDevice(), and skepu::Matrix< T >::size().

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template<typename T>

bool skepu::Matrix< T >::operator!=

(

const Matrix< T > &

c1

)

Please refer to the documentation of std::vector.

References skepu::Matrix< T >::updateHost().

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template<typename T>

const Matrix< T > & skepu::Matrix< T >::operator%=

(

const Matrix< T > &

rhs

)

Taking Mod with rhs matrix, element wise to current matrix. Two matrices must be of same size.

Parameters:

rhs	The value which is used in taking mod to current matrix.

References skepu::Matrix< T >::updateHost().

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template<typename T>

const Matrix< T > & skepu::Matrix< T >::operator%=

(

const T &

rhs

)

Taking Mod with a scalar value to all elements in the current matrix.

Parameters:

rhs	The value which is used in taking mod to current matrix.

template<typename T >

const T & skepu::Matrix< T >::operator()	(	const size_type	row,
		const size_type	col
	)		const

Behaves like operator[] and unlike skepu::Vector, it cares about synchronizing with device. Can be used when accessing to access elements row and column wise.

Parameters:

row	Index to a specific row of the Matrix.
col	Index to a specific column of the Matrix.

template<typename T >

T & skepu::Matrix< T >::operator()	(	const size_type	row,
		const size_type	col
	)

Behaves like operator[] and unlike skepu::Vector, it cares about synchronizing with device. Can be used when accessing to access elements row and column wise.

Parameters:

row	Index to a specific row of the Matrix.
col	Index to a specific column of the Matrix.

template<typename T >

T & skepu::Matrix< T >::operator()

(

const size_type

index

)

Behaves like operator[] but does not care about synchronizing with device. Can be used when accessing many elements quickly so that no synchronization overhead effects performance. Make sure to properly synch with device by calling updateHost etc before use.

Parameters:

index

Index of element assuming continuous Matrix row-wise storage. To facilitate access using single indexing

template<typename T>

const Matrix< T > & skepu::Matrix< T >::operator*=

(

const Matrix< T > &

rhs

)

Multiplies rhs matrix operation element wise to current matrix. Two matrices must be of same size. NB it is not matrix multiplication

Parameters:

rhs	The matrix which is used in multiplication to current matrix.

References skepu::Matrix< T >::updateHost().

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template<typename T>

const Matrix< T > & skepu::Matrix< T >::operator*=

(

const T &

rhs

)

Multiplies a scalar value to all elements in the current matrix.

Parameters:

rhs	The value which is used in multiplication to current matrix.

template<typename T>

const Matrix< T > & skepu::Matrix< T >::operator+=

(

const Matrix< T > &

rhs

)

Add rhs matrix operation element wise to current matrix. Two matrices must be of same size.

Parameters:

rhs	The matrix which is used in addition to current matrix.

References skepu::Matrix< T >::updateHost().

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template<typename T>

const Matrix< T > & skepu::Matrix< T >::operator+=

(

const T &

rhs

)

Adds a scalar value to all elements in the current matrix.

Parameters:

rhs	The value which is used in addition to current matrix.

template<typename T>

const Matrix< T > & skepu::Matrix< T >::operator-=

(

const Matrix< T > &

rhs

)

Subtract rhs matrix operation element wise to current matrix. Two matrices must be of same size.

Parameters:

rhs	The matrix which is used in subtraction to current matrix.

References skepu::Matrix< T >::updateHost().

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template<typename T>

const Matrix< T > & skepu::Matrix< T >::operator-=

(

const T &

rhs

)

Subtracts a scalar value to all elements in the current matrix.

Parameters:

rhs	The value which is used in subtraction to current matrix.

template<typename T>

const Matrix< T > & skepu::Matrix< T >::operator/=

(

const Matrix< T > &

rhs

)

Divides rhs matrix operation element wise to current matrix. Two matrices must be of same size. NB it is not matrix multiplication

Parameters:

rhs	The matrix which is used in division to current matrix.

References skepu::Matrix< T >::updateHost().

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template<typename T>

const Matrix< T > & skepu::Matrix< T >::operator/=

(

const T &

rhs

)

Divides a scalar value to all elements in the current matrix.

Parameters:

rhs	The value which is used in division to current matrix.

template<typename T>

bool skepu::Matrix< T >::operator<

(

const Matrix< T > &

c1

)

Please refer to the documentation of std::vector.

References skepu::Matrix< T >::updateHost().

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template<typename T>

bool skepu::Matrix< T >::operator<=

(

const Matrix< T > &

c1

)

Please refer to the documentation of std::vector.

References skepu::Matrix< T >::updateHost().

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template<typename T>

Matrix< T > & skepu::Matrix< T >::operator=

(

Matrix< T > &

other

)

copy matrix,,, copy row and column count as well along with data

References skepu::Matrix< T >::updateHost().

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template<typename T>

Matrix< T > & skepu::Matrix< T >::operator=

(

const T &

elem

)

To initialize a matrix with soem scalar value.

Parameters:

elem	The element you want to assign to all matrix.

template<typename T>

bool skepu::Matrix< T >::operator==

(

const Matrix< T > &

c1

)

Please refer to the documentation of std::vector.

References skepu::Matrix< T >::updateHost().

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template<typename T>

bool skepu::Matrix< T >::operator>

(

const Matrix< T > &

c1

)

Please refer to the documentation of std::vector.

References skepu::Matrix< T >::updateHost().

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template<typename T>

bool skepu::Matrix< T >::operator>=

(

const Matrix< T > &

c1

)

Please refer to the documentation of std::vector.

References skepu::Matrix< T >::updateHost().

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template<typename T >

T & skepu::Matrix< T >::operator[]

(

const size_type

index

)

A operator[] that care about synchronizing with device. Can be used when accessing elements considering consecutive storage

Parameters:

index

Index of element assuming continuous Matrix row-wise storage. To facilitate access using single indexing

template<typename T >

const T & skepu::Matrix< T >::operator[]

(

const size_type

index

)

const

A operator[] that care about synchronizing with device. Can be used when accessing elements considering consecutive storage

Parameters:

index

Index of element assuming continuous Matrix row-wise storage. To facilitate access using single indexing

template<typename T>

void skepu::Matrix< T >::randomize	(	int	min = 0,
		int	max = RAND_MAX
	)		[inline]

Randomizes the Matrix.

Sets each element of the Matrix to a random number between min and max. The numbers are generated as integers but are cast to the type of the matrix.

Parameters:

min	The smallest number an element can become.
max	The largest number an element can become.

References skepu::Matrix< T >::invalidateDevice(), skepu::max(), skepu::min(), and skepu::Matrix< T >::size().

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template<typename T>

void skepu::Matrix< T >::resize	(	size_type	_rows,
		size_type	_cols,
		T	val = T()
	)

resize matrix,,, invalidates all copies before resizing.

References skepu::min().

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template<typename T >

Matrix< T >::size_type skepu::Matrix< T >::row_back

(

size_type

row

)

Return index of last element of row.

Parameters:

row	Index of the row.

template<typename T >

const T & skepu::Matrix< T >::row_back

(

size_type

row

)

const

Return last element of row.

Parameters:

row	Index of the row.

template<typename T >

Matrix< T >::size_type skepu::Matrix< T >::row_front

(

size_type

row

)

Return index of first element of row in 1D container.

Parameters:

row	Index of the row.

template<typename T >

const T & skepu::Matrix< T >::row_front

(

size_type

row

)

const

Return first element of row.

Parameters:

row	Index of the row.

template<typename T>

void skepu::Matrix< T >::save

(

const std::string &

filename

)

[inline]

Saves content of Matrix to a file.

Outputs the matrix as text on one line with space between elements to the specified file. Mainly for testing purposes.

Parameters:

filename

Name of file to save to.

References skepu::Matrix< T >::updateHost().

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template<typename T>

size_type skepu::Matrix< T >::size

(

)

const [inline]

Returns total size of Matrix.

Returns:

size of the Matrix.

template<typename T >

Matrix< T > & skepu::Matrix< T >::subsection	(	size_type	row,
		size_type	col,
		size_type	rowWidth,
		size_type	colWidth
	)

To get a subsection of matrix. This will creat a separate copy.

Parameters:

row	Index of row to get.
rowWidth	Width of the row of new Matrix.
col	Index of column to get.
colWidth	Width of column of new Matrix.

References skepu::Matrix< T >::at(), skepu::Matrix< T >::total_cols(), and skepu::Matrix< T >::total_rows().

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template<typename T>

void skepu::Matrix< T >::swap

(

Matrix< T > &

from

)

Please refer to the documentation of std::vector. Updates and invalidate both Matrices before swapping.

References skepu::Matrix< T >::updateHostAndInvalidateDevice().

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template<typename T>

size_type skepu::Matrix< T >::total_cols

(

)

const [inline]

Returns total number of columns in the Matrix.

Returns:

columns in the Matrix.

template<typename T>

size_type skepu::Matrix< T >::total_rows

(

)

const [inline]

Returns total number of rows in the Matrix.

Returns:

rows in the Matrix.

template<typename T>

Matrix< T >::device_pointer_type_cl skepu::Matrix< T >::updateDevice_CL	(	T *	start,
		size_type	cols,
		Device_CL *	device,
		bool	copy
	)

Update device with matrix content.

Update device with a Matrix range by specifying rowsize only as number of rows is assumed to be 1 in this case. Helper function, useful for scenarios where matrix need to be treated like Vector 1D. If Matrix does not have an allocation on the device for the current range, create a new allocation and if specified, also copy Matrix data to device. Saves newly allocated ranges to m_deviceMemPointers_CL so matrix can keep track of where and what it has stored on devices.

Parameters:

start	Pointer to first element in range to be updated with device.
cols	Number of columns.
device	Pointer to the device that should be synched with.
copy	Boolean value that tells whether to only allocate or also copy matrix data to device. True copies, False only allocates.

template<typename T>

Matrix< T >::device_pointer_type_cl skepu::Matrix< T >::updateDevice_CL	(	T *	start,
		size_type	rows,
		size_type	cols,
		Device_CL *	device,
		bool	copy
	)

Update device with matrix content.

Update device with a Matrix range by specifying rowsize and column size. This allows to create rowwise paritions. If Matrix does not have an allocation on the device for the current range, create a new allocation and if specified, also copy Matrix data to device. Saves newly allocated ranges to m_deviceMemPointers_CL so matrix can keep track of where and what it has stored on devices.

Parameters:

start	Pointer to first element in range to be updated with device.
rows	Number of rows.
cols	Number of columns.
device	Pointer to the device that should be synched with.
copy	Boolean value that tells whether to only allocate or also copy matrix data to device. True copies, False only allocates.

References skepu::DeviceMemPointer_CL< T >::copyHostToDevice(), and skepu::Device_CL::getDeviceID().

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template<typename T>

Matrix< T >::device_pointer_type_cu skepu::Matrix< T >::updateDevice_CU	(	T *	start,
		size_type	cols,
		int	deviceID,
		bool	copy
	)

Update device with matrix content.

Update device with a Matrix range by specifying rowsize only as number of rows is assumed to be 1 in this case. Helper function, useful for scenarios where matrix need to be treated like Vector 1D. If Matrix does not have an allocation on the device for the current range, create a new allocation and if specified, also copy Matrix data to device. Saves newly allocated ranges to m_deviceMemPointers_CU so matrix can keep track of where and what it has stored on devices.

Parameters:

start	Pointer to first element in range to be updated with device.
cols	Number of columns.
deviceID	Integer specififying the device that should be synched with.
copy	Boolean value that tells whether to only allocate or also copy matrix data to device. True copies, False only allocates.

template<typename T>

Matrix< T >::device_pointer_type_cu skepu::Matrix< T >::updateDevice_CU	(	T *	start,
		size_type	rows,
		size_type	cols,
		int	deviceID,
		bool	copy,
		bool	usePitch = false
	)

Update device with matrix content.

Update device with a Matrix range by specifying rowsize and column size. This allows to create rowwise paritions. If Matrix does not have an allocation on the device for the current range, create a new allocation and if specified, also copy Matrix data to device. Saves newly allocated ranges to m_deviceMemPointers_CU so matrix can keep track of where and what it has stored on devices.

Parameters:

start	Pointer to first element in range to be updated with device.
rows	Number of rows.
cols	Number of columns.
deviceID	Integer specififying the device that should be synched with.
copy	Boolean value that tells whether to only allocate or also copy matrix data to device. True copies, False only allocates.
usePitch	To allow 2D CUDA memory allocation which can result in padding inserted to make coalescing work.

References skepu::DeviceMemPointer_CU< T >::copyHostToDevice(), and skepu::Environment< T >::getInstance().

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template<typename T >

void skepu::Matrix< T >::updateHost

(

)

const [inline]

Updates the matrix from its device allocations.

template<typename T >

void skepu::Matrix< T >::updateHostAndInvalidateDevice

(

)

[inline]

First updates the matrix from its device allocations. Then invalidates the data allocated on devices.

---

Friends And Related Function Documentation

template<typename T>

std::ostream& operator<<	(	std::ostream &	os,
		Matrix< T > &	matrix
	)		[friend]

Overloaded stream operator, for testing purposes.

Outputs the matrix rowwise having one row on each line.

---

The documentation for this class was generated from the following files:

• include/skepu/matrix.h
• include/skepu/src/matrix.inl
• include/skepu/src/matrix_cl.inl
• include/skepu/src/matrix_cu.inl
• include/skepu/src/matrix_transpose.inl