org.apache.sysds.runtime.controlprogram.parfor

Class ResultMergeLocalFile

java.lang.Object

org.apache.sysds.runtime.controlprogram.parfor.ResultMerge<MatrixObject>

org.apache.sysds.runtime.controlprogram.parfor.ResultMergeMatrix

org.apache.sysds.runtime.controlprogram.parfor.ResultMergeLocalFile

All Implemented Interfaces:

Serializable

public class ResultMergeLocalFile
extends ResultMergeMatrix

TODO potential extension: parallel merge (create individual staging files concurrently) NOTE: file merge typically used due to memory constraints - parallel merge would increase the memory consumption again.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static boolean	ALLOW_COPY_CELLFILES

Constructor Summary

Constructors

Constructor and Description
ResultMergeLocalFile(MatrixObject out, MatrixObject[] in, String outputFilename, boolean accum)

Method Summary

Modifier and Type	Method and Description
MatrixObject	executeParallelMerge(int par) Merge all given input matrices in parallel into the given output matrix.
MatrixObject	executeSerialMerge() Merge all given input matrices sequentially into the given output matrix.

Methods inherited from class java.lang.Object

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

Field Detail

ALLOW_COPY_CELLFILES

public static final boolean ALLOW_COPY_CELLFILES

See Also:

Constant Field Values

Constructor Detail

ResultMergeLocalFile

public ResultMergeLocalFile(MatrixObject out,
                            MatrixObject[] in,
                            String outputFilename,
                            boolean accum)

Method Detail

executeSerialMerge

public MatrixObject executeSerialMerge()

Description copied from class: ResultMerge

Merge all given input matrices sequentially into the given output matrix. The required space in-memory is the size of the output matrix plus the size of one input matrix at a time.

Specified by:

executeSerialMerge in class ResultMerge<MatrixObject>

Returns:

output (merged) matrix

executeParallelMerge

public MatrixObject executeParallelMerge(int par)

Description copied from class: ResultMerge

Merge all given input matrices in parallel into the given output matrix. The required space in-memory is the size of the output matrix plus the size of all input matrices.

Specified by:

executeParallelMerge in class ResultMerge<MatrixObject>

Parameters:

par - degree of parallelism

Returns:

output (merged) matrix