Package org.ejml

Class EjmlParameters

java.lang.Object

org.ejml.EjmlParameters

public class EjmlParameters
extends Object

This is a list of parameters that are used across the code. To tune performance for a particular system change these values.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	EjmlParameters.MemoryUsage

Field Summary

Fields

Modifier and Type	Field	Description
static int	BLOCK_WIDTH	In modern computers there are high speed memory caches.
static int	BLOCK_WIDTH_CHOL
static int	CMULT_COLUMN_SWITCH
static int	CMULT_TRANAB_COLUMN_SWITCH
static EjmlParameters.MemoryUsage	MEMORY	Used to adjust which algorithms are used.
static int	MULT_COLUMN_SWITCH	At what point does it switch from a small matrix multiply to the reorder version.
static int	MULT_INNER_SWITCH
static int	MULT_TRANAB_COLUMN_SWITCH
static int	SWITCH_BLOCK64_CHOLESKY	At which point should it switch to the block cholesky algorithm.
static int	SWITCH_BLOCK64_QR
static final float	TOL32
static final double	TOL64
static int	TRANSPOSE_SWITCH

Constructor Summary

Constructors

Constructor	Description
EjmlParameters()

Method Summary

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

TOL32

public static final float TOL32

See Also:

• Constant Field Values

TOL64

public static final double TOL64

See Also:

• Constant Field Values

MEMORY

public static EjmlParameters.MemoryUsage MEMORY

Used to adjust which algorithms are used. Often there is a trade off between memory usage and speed.

BLOCK_WIDTH

public static int BLOCK_WIDTH

In modern computers there are high speed memory caches. It is assumed that a square block with this width can be contained entirely in one of those caches. Settings this value too large can have a dramatic effect on performance in some situations. Setting it too low results in a less dramatic performance hit. The optimal value is dependent on the computer's memory architecture.

BLOCK_WIDTH_CHOL

public static int BLOCK_WIDTH_CHOL

TRANSPOSE_SWITCH

public static int TRANSPOSE_SWITCH

MULT_COLUMN_SWITCH

public static int MULT_COLUMN_SWITCH

At what point does it switch from a small matrix multiply to the reorder version.

MULT_TRANAB_COLUMN_SWITCH

public static int MULT_TRANAB_COLUMN_SWITCH

MULT_INNER_SWITCH

public static int MULT_INNER_SWITCH

CMULT_COLUMN_SWITCH

public static int CMULT_COLUMN_SWITCH

CMULT_TRANAB_COLUMN_SWITCH

public static int CMULT_TRANAB_COLUMN_SWITCH

SWITCH_BLOCK64_CHOLESKY

public static int SWITCH_BLOCK64_CHOLESKY

At which point should it switch to the block cholesky algorithm.

In benchmarks the basic actually performed slightly better at 1000 but in JVM 1.6 it some times get stuck in a mode where the basic version was very slow in that case the block performed much better.

SWITCH_BLOCK64_QR

public static int SWITCH_BLOCK64_QR

Constructor Details

EjmlParameters

public EjmlParameters()