ezp::blacs_context< IT > Class Template Reference

Collaboration diagram for ezp::blacs_context< IT >:

Public Member Functions
	blacs_context (const char order)
	blacs_context (const IT rows, const IT cols, const char order='R')
	blacs_context (const blacs_context &other)
	blacs_context (blacs_context &&) noexcept=delete
blacs_context &	operator= (const blacs_context &)=delete
blacs_context &	operator= (blacs_context &&) noexcept=delete
auto	desc_g (const IT num_rows, const IT num_cols)
	Generates a descriptor for a global matrix.
auto	desc_l (const IT num_rows, const IT num_cols, const IT row_block, const IT col_block, const IT lead)
	Generates a descriptor for a local matrix.
auto	desc_l (const IT num_rows, const IT num_cols, const IT block, const IT lead)
template<data_t DT>
auto	scatter (const full_mat< DT, IT > &A, const desc< IT > &desc_a, std::vector< DT > &B, const desc< IT > &desc_b)
template<data_t DT>
auto	gather (const std::vector< DT > &A, const desc< IT > &desc_a, const full_mat< DT, IT > &B, const desc< IT > &desc_b)
auto	copy_to (const IT *A, const IT *desc_a, IT *B, const IT *desc_b)
bool	is_valid () const
auto	row_block (const IT n) const
	Computes the row block size.
auto	col_block (const IT n) const
	Computes the column block size.
auto	rows (const IT n, const IT nb) const
	Computes the number of local rows of the current process.
auto	cols (const IT n, const IT nb) const
	Computes the number of local columns of the current process.
IT	amx (IT number) const
	Perform the global amx operation.
IT	amn (IT number) const
	Perform the global amn operation.

Public Attributes
IT	n_rows
IT	n_cols
IT	context {-1}
IT	rank {-1}
IT	size {-1}
IT	my_row {-1}
IT	my_col {-1}

Member Function Documentation

amn()

template<index_t IT>

IT ezp::blacs_context< IT >::amn ( IT  number ) const

inline

Perform the global amn operation.

This function takes an integer number, which may be different on each process, and computes the minimum value across all processes. The result is broadcast to all processes.

For example, if the input number is 0, 1, 2, 3 on four processes, this function will return 0 on all processes.

Parameters

number

The integer number to be updated.

Returns

The updated integer number.

amx()

template<index_t IT>

IT ezp::blacs_context< IT >::amx ( IT  number ) const

inline

Perform the global amx operation.

This function takes an integer number, which may be different on each process, and computes the maximum value across all processes. The result is broadcast to all processes.

For example, if the input number is 0, 1, 2, 3 on four processes, this function will return 3 on all processes.

Parameters

number

The integer number to be updated.

Returns

The updated integer number.

cols()

template<index_t IT>

auto ezp::blacs_context< IT >::cols ( const IT  n, const IT  nb  ) const

inline

Computes the number of local columns of the current process.

This function calculates the number of columns of the current process in a distributed matrix using the numroc function.

Parameters

n	The total number of columns in the global matrix.
nb	The block size used for the distribution.

Returns

The number of local columns of the calling process.

desc_g()

template<index_t IT>

auto ezp::blacs_context< IT >::desc_g ( const IT  num_rows, const IT  num_cols  )

inline

Generates a descriptor for a global matrix.

This function initializes and returns a descriptor for a global matrix with the specified number of rows and columns.

Template Parameters

IT	The integer type used for matrix dimensions.

Parameters

num_rows	The number of rows in the global matrix.
num_cols	The number of columns in the global matrix.

Returns

A descriptor for the global matrix.

desc_l()

template<index_t IT>

auto ezp::blacs_context< IT >::desc_l ( const IT  num_rows, const IT  num_cols, const IT  row_block, const IT  col_block, const IT  lead  )

inline

Generates a descriptor for a local matrix.

This function initializes a descriptor for a local matrix with the given dimensions and block sizes.

Template Parameters

IT	The integer type used for matrix dimensions and block sizes.

Parameters

num_rows	The number of rows in the global matrix.
num_cols	The number of columns in the global matrix.
row_block	The block size in the row dimension.
col_block	The block size in the column dimension.
lead	The leading dimension of the local matrix.

Returns

A descriptor for the local matrix.

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rows()

template<index_t IT>

auto ezp::blacs_context< IT >::rows ( const IT  n, const IT  nb  ) const

inline

Computes the number of local rows of the current process.

This function calculates the number of rows of the current process in a distributed matrix using the numroc function.

Parameters

n	The total number of rows in the global matrix.
nb	The block size used for the distribution.

Returns

The number of local rows of the current process.

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

• ezp/abstract/traits.hpp