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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.nemo.compiler.backend.nemo.prophet</a></div> |
| <h2 title="Class ParallelismProphet" class="title">Class ParallelismProphet</h2> |
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| <li>java.lang.Object</li> |
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| <dd><code><a href="Prophet.html" title="interface in org.apache.nemo.compiler.backend.nemo.prophet">Prophet</a><java.lang.String,​java.lang.Long></code></dd> |
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| <pre>public final class <span class="typeNameLabel">ParallelismProphet</span> |
| extends java.lang.Object |
| implements <a href="Prophet.html" title="interface in org.apache.nemo.compiler.backend.nemo.prophet">Prophet</a><java.lang.String,​java.lang.Long></pre> |
| <div class="block">A prophet for Parallelism.</div> |
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| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(org.apache.nemo.common.ir.IRDAG,org.apache.nemo.runtime.common.plan.PhysicalPlan,org.apache.nemo.runtime.master.scheduler.SimulationScheduler,org.apache.nemo.runtime.common.plan.PhysicalPlanGenerator,java.util.Set)">ParallelismProphet</a></span>​(<a href="../../../../common/ir/IRDAG.html" title="class in org.apache.nemo.common.ir">IRDAG</a> irdag, |
| <a href="../../../../runtime/common/plan/PhysicalPlan.html" title="class in org.apache.nemo.runtime.common.plan">PhysicalPlan</a> physicalPlan, |
| <a href="../../../../runtime/master/scheduler/SimulationScheduler.html" title="class in org.apache.nemo.runtime.master.scheduler">SimulationScheduler</a> simulationScheduler, |
| <a href="../../../../runtime/common/plan/PhysicalPlanGenerator.html" title="class in org.apache.nemo.runtime.common.plan">PhysicalPlanGenerator</a> physicalPlanGenerator, |
| java.util.Set<<a href="../../../../runtime/common/plan/StageEdge.html" title="class in org.apache.nemo.runtime.common.plan">StageEdge</a>> edgesToOptimize)</code></th> |
| <td class="colLast"> |
| <div class="block">Default constructor for ParallelismProphet.</div> |
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| <td class="colFirst"><code>java.util.Map<java.lang.String,​java.lang.Long></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#calculate()">calculate</a></span>()</code></th> |
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| <div class="block">Launch SimulationScheduler and find out the optimal parallelism.</div> |
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| <h4>ParallelismProphet</h4> |
| <pre>public ParallelismProphet​(<a href="../../../../common/ir/IRDAG.html" title="class in org.apache.nemo.common.ir">IRDAG</a> irdag, |
| <a href="../../../../runtime/common/plan/PhysicalPlan.html" title="class in org.apache.nemo.runtime.common.plan">PhysicalPlan</a> physicalPlan, |
| <a href="../../../../runtime/master/scheduler/SimulationScheduler.html" title="class in org.apache.nemo.runtime.master.scheduler">SimulationScheduler</a> simulationScheduler, |
| <a href="../../../../runtime/common/plan/PhysicalPlanGenerator.html" title="class in org.apache.nemo.runtime.common.plan">PhysicalPlanGenerator</a> physicalPlanGenerator, |
| java.util.Set<<a href="../../../../runtime/common/plan/StageEdge.html" title="class in org.apache.nemo.runtime.common.plan">StageEdge</a>> edgesToOptimize)</pre> |
| <div class="block">Default constructor for ParallelismProphet.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>irdag</code> - current IRDAG</dd> |
| <dd><code>physicalPlan</code> - current PhysicalPlan</dd> |
| <dd><code>simulationScheduler</code> - SimulationScheduler to launch</dd> |
| <dd><code>physicalPlanGenerator</code> - PhysicalPlanGenerator to make physical plan which will be launched by |
| simulation scheduler</dd> |
| <dd><code>edgesToOptimize</code> - edges to optimize at runtime pass</dd> |
| </dl> |
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| <a id="calculate()"> |
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| <h4>calculate</h4> |
| <pre class="methodSignature">public java.util.Map<java.lang.String,​java.lang.Long> calculate()</pre> |
| <div class="block">Launch SimulationScheduler and find out the optimal parallelism. |
| For now, the number of candidate parallelisms is seven, so we iterate seven times. |
| In each iteration index i, the candidate parallelism is calculated by dividing the i-th power of two from |
| partitonerProperty (which is guaranteed to be one of 1024, 2048, 4096. For more information, please refer to |
| SamplingTaskSizingPass). This approach is taken to guarantee the equal length of each partition, which will be |
| updated in DynamicTaskSizingRuntimePass.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="Prophet.html#calculate()">calculate</a></code> in interface <code><a href="Prophet.html" title="interface in org.apache.nemo.compiler.backend.nemo.prophet">Prophet</a><java.lang.String,​java.lang.Long></code></dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Map of one element, with key "opt.parallelism".</dd> |
| </dl> |
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