org.apache.giraph.ooc.policy

Enum OutOfCoreOracle.IOAction

java.lang.Object

java.lang.Enum<OutOfCoreOracle.IOAction>

org.apache.giraph.ooc.policy.OutOfCoreOracle.IOAction

All Implemented Interfaces:

Serializable, Comparable<OutOfCoreOracle.IOAction>

Enclosing interface:

OutOfCoreOracle

public static enum OutOfCoreOracle.IOAction
extends Enum<OutOfCoreOracle.IOAction>

Different types of IO actions that can potentially lead to a more desired state of computation for out-of-core mechanism. These actions are issued based on the status of the memory (memory pressure, rate of data transfer to memory, etc.)

Enum Constant Summary

Enum Constants

Enum Constant and Description
LOAD_PARTITION Loading a partition (prioritizing *unprocessed* over *processed*) from disk to memory.
LOAD_TO_SWAP_PARTITION Loading an *unprocessed* partition from disk to memory, only if there are *processed* partitions in memory.
LOAD_UNPROCESSED_PARTITION Loading an *unprocessed* partition from disk to memory.
STORE_MESSAGES_AND_BUFFERS Either of: - storing incoming messages of any partition currently on disk, or - storing incoming messages' raw data buffer of any partition currently on disk, or - storing partitions' raw data buffer for those partitions that are currently on disk.
STORE_PARTITION Storing a partition from memory on disk, prioritizing to *processed* partitions on memory.
STORE_PROCESSED_PARTITION Storing a partition that is *processed* in the current iteration cycle.
URGENT_LOAD_PARTITION Loading a partition regardless of the memory situation.

Method Summary

Modifier and Type	Method and Description
static OutOfCoreOracle.IOAction	valueOf(String name) Returns the enum constant of this type with the specified name.
static OutOfCoreOracle.IOAction[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

STORE_MESSAGES_AND_BUFFERS

public static final OutOfCoreOracle.IOAction STORE_MESSAGES_AND_BUFFERS

Either of: - storing incoming messages of any partition currently on disk, or - storing incoming messages' raw data buffer of any partition currently on disk, or - storing partitions' raw data buffer for those partitions that are currently on disk.

STORE_PROCESSED_PARTITION

public static final OutOfCoreOracle.IOAction STORE_PROCESSED_PARTITION

Storing a partition that is *processed* in the current iteration cycle. This action is also known as "soft store"

STORE_PARTITION

public static final OutOfCoreOracle.IOAction STORE_PARTITION

Storing a partition from memory on disk, prioritizing to *processed* partitions on memory. However, if there is no *processed* partition, store should happen at any cost, even if an *unprocessed* partition has to be stored. This action is also know as "hard store".

LOAD_TO_SWAP_PARTITION

public static final OutOfCoreOracle.IOAction LOAD_TO_SWAP_PARTITION

Loading an *unprocessed* partition from disk to memory, only if there are *processed* partitions in memory. This action basically initiates a swap operation.

LOAD_UNPROCESSED_PARTITION

public static final OutOfCoreOracle.IOAction LOAD_UNPROCESSED_PARTITION

Loading an *unprocessed* partition from disk to memory. This action is also known as "soft load".

LOAD_PARTITION

public static final OutOfCoreOracle.IOAction LOAD_PARTITION

Loading a partition (prioritizing *unprocessed* over *processed*) from disk to memory. Loading a *processed* partition to memory is a prefetch of that partition to be processed in the next superstep. This action is also known as "hard load".

URGENT_LOAD_PARTITION

public static final OutOfCoreOracle.IOAction URGENT_LOAD_PARTITION

Loading a partition regardless of the memory situation. An out-of-core mechanism may use this action to signal IO threads that it is allowed to load a partition that is specifically requested.

Method Detail

values

public static OutOfCoreOracle.IOAction[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (OutOfCoreOracle.IOAction c : OutOfCoreOracle.IOAction.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static OutOfCoreOracle.IOAction valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null