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| <div class="subTitle">org.apache.sysds.runtime.controlprogram.parfor</div> |
| <h2 title="Class LocalTaskQueue" class="title">Class LocalTaskQueue<T></h2> |
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| <li>org.apache.sysds.runtime.controlprogram.parfor.LocalTaskQueue<T></li> |
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| <pre>public class <span class="typeNameLabel">LocalTaskQueue<T></span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> |
| <div class="block">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.</div> |
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| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/controlprogram/parfor/LocalTaskQueue.html#MAX_SIZE">MAX_SIZE</a></span></code> </td> |
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| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/controlprogram/parfor/LocalTaskQueue.html#NO_MORE_TASKS">NO_MORE_TASKS</a></span></code> </td> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/controlprogram/parfor/LocalTaskQueue.html#LocalTaskQueue--">LocalTaskQueue</a></span>()</code> </td> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/controlprogram/parfor/LocalTaskQueue.html#closeInput--">closeInput</a></span>()</code> |
| <div class="block">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.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/sysds/runtime/controlprogram/parfor/LocalTaskQueue.html" title="type parameter in LocalTaskQueue">T</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/controlprogram/parfor/LocalTaskQueue.html#dequeueTask--">dequeueTask</a></span>()</code> |
| <div class="block">Synchronized read and delete from the top of the FIFO queue.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/controlprogram/parfor/LocalTaskQueue.html#enqueueTask-T-">enqueueTask</a></span>(<a href="../../../../../../org/apache/sysds/runtime/controlprogram/parfor/LocalTaskQueue.html" title="type parameter in LocalTaskQueue">T</a> t)</code> |
| <div class="block">Synchronized insert of a new task to the end of the FIFO queue.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/sysds/runtime/controlprogram/parfor/LocalTaskQueue.html#toString--">toString</a></span>()</code> </td> |
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| <h4>MAX_SIZE</h4> |
| <pre>public static final int MAX_SIZE</pre> |
| <dl> |
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| <dd><a href="../../../../../../constant-values.html#org.apache.sysds.runtime.controlprogram.parfor.LocalTaskQueue.MAX_SIZE">Constant Field Values</a></dd> |
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| <h4>NO_MORE_TASKS</h4> |
| <pre>public static final <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> NO_MORE_TASKS</pre> |
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| <a name="LocalTaskQueue--"> |
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| <h4>LocalTaskQueue</h4> |
| <pre>public LocalTaskQueue()</pre> |
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| <h4>enqueueTask</h4> |
| <pre>public void enqueueTask(<a href="../../../../../../org/apache/sysds/runtime/controlprogram/parfor/LocalTaskQueue.html" title="type parameter in LocalTaskQueue">T</a> t) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></pre> |
| <div class="block">Synchronized insert of a new task to the end of the FIFO queue.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>t</code> - task</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></code> - if InterruptedException occurs</dd> |
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| <h4>dequeueTask</h4> |
| <pre>public <a href="../../../../../../org/apache/sysds/runtime/controlprogram/parfor/LocalTaskQueue.html" title="type parameter in LocalTaskQueue">T</a> dequeueTask() |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></pre> |
| <div class="block">Synchronized read and delete from the top of the FIFO queue.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>task</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></code> - if InterruptedException occurs</dd> |
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| <h4>closeInput</h4> |
| <pre>public void closeInput()</pre> |
| <div class="block">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.</div> |
| </li> |
| </ul> |
| <a name="toString--"> |
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| <h4>toString</h4> |
| <pre>public <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> toString()</pre> |
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