Class LocalTaskQueue<T>
- java.lang.Object
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- org.apache.sysds.runtime.controlprogram.parfor.LocalTaskQueue<T>
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public class LocalTaskQueue<T> extends Object
This class provides a way of dynamic task distribution to multiple workers in local multi-threaded environments. Its main purpose is inter-thread communication for achieving dynamic load balancing. A good load balance between parallel workers is crucial with regard to the overall speedup of parallelization (see Amdahl's law). From a technical perspective, a thread monitor concept is used for blocking of waiting writers and readers. Synchronized writes and reads ensure that each task is only read by exactly one reader. Furthermore, the queue is implemented as a simple FIFO.
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Field Summary
Fields Modifier and Type Field Description static int
MAX_SIZE
static Object
NO_MORE_TASKS
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Constructor Summary
Constructors Constructor Description LocalTaskQueue()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
closeInput()
Synchronized (logical) insert of a NO_MORE_TASKS symbol at the end of the FIFO queue in order to mark that no more tasks will be inserted into the queue.T
dequeueTask()
Synchronized read and delete from the top of the FIFO queue.void
enqueueTask(T t)
Synchronized insert of a new task to the end of the FIFO queue.String
toString()
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Field Detail
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MAX_SIZE
public static final int MAX_SIZE
- See Also:
- Constant Field Values
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NO_MORE_TASKS
public static final Object NO_MORE_TASKS
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Method Detail
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enqueueTask
public void enqueueTask(T t) throws InterruptedException
Synchronized insert of a new task to the end of the FIFO queue.- Parameters:
t
- task- Throws:
InterruptedException
- if InterruptedException occurs
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dequeueTask
public T dequeueTask() throws InterruptedException
Synchronized read and delete from the top of the FIFO queue.- Returns:
- task
- Throws:
InterruptedException
- if InterruptedException occurs
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closeInput
public void closeInput()
Synchronized (logical) insert of a NO_MORE_TASKS symbol at the end of the FIFO queue in order to mark that no more tasks will be inserted into the queue.
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