Package uk.ac.manchester.spinnaker.front_end

Class Constants

java.lang.Object

uk.ac.manchester.spinnaker.front_end.Constants

public abstract class Constants
extends Object

Miscellaneous constants that can be overridden by system properties.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	CORE_DATA_SDRAM_BASE_TAG	Base SDRAM tag to use for core data.
static final String	PARALLEL_PROPERTY	The name of the system property defining the number of parallel tasks that should be executed at once.
static final int	PARALLEL_SIZE	The number of parallel tasks that should be executed at once.
static final String	SMALL_RETRIEVE_PROPERTY	The name of the system property defining the threshold at which retrieves are switched over to the fast (data-speed-up-packet-gatherer based) retrieve protocol.
static final int	SMALL_RETRIEVE_THRESHOLD	Retrieves of data that is less than this many bytes are done via a normal SCAMP memory read.

Constructor Summary

Constructors

Constructor	Description
Constants()

Method Summary

Methods inherited from class java.lang.Object

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

Field Details

PARALLEL_PROPERTY

public static final String PARALLEL_PROPERTY

The name of the system property defining the number of parallel tasks that should be executed at once. The fundamental unit of parallelisation is the SpiNNaker board, as there's a strict limit on just how much trickery can be pushed through a SCAMP process.

This is used to set the scaling size of various thread pool executors, and should be set so as to keep the network reasonably busy with a large job.

If a property with this name is absent, a default is used (4).

See Also:

• Constant Field Values

PARALLEL_SIZE

public static final int PARALLEL_SIZE

The number of parallel tasks that should be executed at once. The fundamental unit of parallelisation is the SpiNNaker board, as there's a strict limit on just how much trickery can be pushed through a SCAMP process.

This is used to set the scaling size of various thread pool executors, and should be set so as to keep the network reasonably busy with a large job.

SMALL_RETRIEVE_PROPERTY

public static final String SMALL_RETRIEVE_PROPERTY

The name of the system property defining the threshold at which retrieves are switched over to the fast (data-speed-up-packet-gatherer based) retrieve protocol. Below this threshold, the retrieves of data are done via a normal SCAMP memory read.

If a property with this name is absent, a default is used (40000).

See Also:

• Constant Field Values

SMALL_RETRIEVE_THRESHOLD

public static final int SMALL_RETRIEVE_THRESHOLD

Retrieves of data that is less than this many bytes are done via a normal SCAMP memory read.

CORE_DATA_SDRAM_BASE_TAG

public static final int CORE_DATA_SDRAM_BASE_TAG

Base SDRAM tag to use for core data. This matches the constant in SpiNNFrontEndCommon.

See Also:

• Constant Field Values

Constructor Details

Constants

public Constants()