bda::Matrix Class Reference

This struct resembles a csr matrix, only doubles are supported The data is stored in contiguous memory, such that they can be copied to a device in one transfer. More...

#include <FPGAMatrix.hpp>

Public Member Functions
	Matrix (int N_, int nnzs_)
	Allocate Matrix and data arrays with given sizes. More...
	~Matrix ()
	All constructors allocate new memory, so always delete here.
int	toRDF (int numColors, std::vector< int > &nodesPerColor, std::vector< std::vector< int > > &colIndicesInColor, int nnzsPerRowLimit, std::vector< std::vector< double > > &ubNnzValues, short int *ubColIndices, int *nnzValsSizes, unsigned char *NROffsets, int *colorSizes)
	Converts this matrix to the dataformat used by the FPGA. More...

Public Attributes
double *	nnzValues
int *	colIndices
int *	rowPointers
int	N
int	nnzs

Detailed Description

This struct resembles a csr matrix, only doubles are supported The data is stored in contiguous memory, such that they can be copied to a device in one transfer.

Constructor & Destructor Documentation

Matrix()

bda::Matrix::Matrix ( int  N_, int  nnzs_  )

inline

Allocate Matrix and data arrays with given sizes.

Parameters

[in]	N	number of rows
[in]	nnzs	number of nonzeros

Member Function Documentation

toRDF()

int bda::Matrix::toRDF	(	int	numColors,
		std::vector< int > &	nodesPerColor,
		std::vector< std::vector< int > > &	colIndicesInColor,
		int	nnzsPerRowLimit,
		std::vector< std::vector< double > > &	ubNnzValues,
		short int *	ubColIndices,
		int *	nnzValsSizes,
		unsigned char *	NROffsets,
		int *	colorSizes
	)

Converts this matrix to the dataformat used by the FPGA.

The FPGA uses a new data format called CSRO (Compressed Sparse Row Offset). The purpose of this format is to allow the data to be streamable. The rowPointers array has an unpredictable reading pattern/timing, it also needs a extra work if a row is shorter than a cacheline. The array of N+1 rowPointers is replaced by an array of nnz rowOffsets. The value of this offset is 0, unless the corresponding nnz is the first of a row, in that case it is 'the number of empty rows preceeding it + 1'. The FPGA can simply add the rowOffset to the current rowIdx to get the new rowIdx. Example: [1 0 0 3 0] nnzValues [1 3 2 2 1 4 3 4 1] [0 2 2 0 1] colIndices [0 3 1 2 4 0 1 2 4] [4 0 0 0 0] -> rowPointers [0 2 5 6 6 9] [0 0 0 0 0] rowOffsets [1 0 1 0 0 1 2 0 0] [0 3 4 0 1] The rowOffset is stored in 1 byte, meaning the maximum value is 255.

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

• opm/simulators/linalg/bda/FPGAMatrix.hpp
• opm/simulators/linalg/bda/FPGAMatrix.cpp