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.

Author:

Peter Abeles

Nested Class Summary

static class

EjmlParameters.MemoryUsage

Field Summary

static int	BLOCK_SIZE Number of elements in a block.
static int	BLOCK_WIDTH In modern computers there are high speed memory caches.
static int	BLOCK_WIDTH_CHOL
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 int	TRANSPOSE_SWITCH

Constructor Summary

EjmlParameters()

Method Summary

Methods inherited from class java.lang.Object

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

Field Detail

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

BLOCK_SIZE

public static int BLOCK_SIZE

Number of elements in a block.

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

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 Detail

EjmlParameters

public EjmlParameters()