comms Module

Uses

- mpi
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Used by

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Graph Key

Nodes of different colours represent the following:

Solid arrows point from a submodule to the (sub)module which it is descended from. Dashed arrows point from a module or program unit to modules which it uses.
Where possible, edges connecting nodes are given different colours to make them easier to distinguish in large graphs.

Derived Types

type, public :: DomainDecomposition

Type to represent the domain decomposition for parallel processing

Components

Type	Visibility	Attributes		Name		Initial
integer,	public		::	communicator			The ID of the communicator for this domain
integer,	public		::	dims(2)			The dimensions of the MPI communicators Cartesian grid
integer,	public		::	neighbours(4)			The ranks of the neighbouring ranks - [down, left, up, right]

Subroutines

public subroutine exchange_boundaries(board, local_nrows, local_ncols, domainDecomp)

Subroutine to exchange boundaries between neighboring ranks

Arguments

Type	Intent	Optional	Attributes		Name
integer,	intent(inout),		dimension(:,:)	::	board	The board to be exchanged
integer,	intent(in)			::	local_nrows	The number of rows in the local board
integer,	intent(in)			::	local_ncols	The number of columns in the local board
type(DomainDecomposition),	intent(in)			::	domainDecomp	The domain decomposition object

public subroutine get_local_grid_info(domainDecomp, rank, global_nrows, global_ncols, nrows_per_rank, ncols_per_rank, coords, row_start, col_start, local_nrows, local_ncols)

Subroutine to get local grid information for a rank

Arguments

Type	Intent	Optional	Attributes		Name
type(DomainDecomposition),	intent(inout)			::	domainDecomp	The MPI communication domain decomposition object
integer,	intent(in)			::	rank	The rank of the current process
integer,	intent(in)			::	global_nrows	The number of columns in the global board
integer,	intent(in)			::	global_ncols	The number of rows in the global board
integer,	intent(out)			::	nrows_per_rank	The number of columns per rank
integer,	intent(out)			::	ncols_per_rank	The number of rows per rank
integer,	intent(out)			::	coords(2)	The coordinates of the current rank in the Cartesian grid
integer,	intent(out)			::	row_start	The starting column index for the local grid
integer,	intent(out)			::	col_start	The starting row index for the local grid
integer,	intent(out)			::	local_nrows	The number of columns in the local grid
integer,	intent(out)			::	local_ncols	The number of rows in the local grid