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<div class="subTitle">edu.rit.gpu.example</div>
<h2 title="Class WalkSackGpu" class="title">Class WalkSackGpu</h2>
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<pre>public class <span class="strong">WalkSackGpu</span>
extends <a href="../../../../edu/rit/pj2/Task.html" title="class in edu.rit.pj2">Task</a></pre>
<div class="block">Class WalkSackGpu is a GPU parallel program that solves a knapsack problem
using a random walk.
<P>
Usage: <TT>java pj2 [gpus=<I>NA</I>] edu.rit.gpu.example.WalkSackGpu [-p]
"<I>constructor</I>" <I>seed</I> <I>reps</I> <I>steps</I> [<I>NB</I>
[<I>NT</I>]]</TT>
<BR><TT><I>NA</I></TT> = Number of GPU accelerators to use
<BR><TT>-p</TT> = Print knapsack problem parameters
<BR><TT><I>constructor</I></TT> = KnapsackProblem constructor expression
<BR><TT><I>seed</I></TT> = Random seed
<BR><TT><I>reps</I></TT> = Number of repetitions
<BR><TT><I>steps</I></TT> = Number of steps per repetition
<BR><TT><I>NB</I></TT> = Number of blocks
<BR><TT><I>NT</I></TT> = Number of threads per block
<P>
The <I>constructor</I> argument gives a constructor expression for a class
that implements interface <a href="../../../../edu/rit/gpu/example/KnapsackProblem.html" title="interface in edu.rit.gpu.example">KnapsackProblem</a>. The
program obtains the knapsack problem parameters&mdash;knapsack capacity,
number of items, weight and value of each item&mdash;from an instance of this
class. For further information about constructor expressions, see class
<a href="../../../../edu/rit/util/Instance.html" title="class in edu.rit.util">edu.rit.util.Instance</a>.
<P>
The program performs <I>reps</I> repetitions. In each repetition, the program
executes a GPU kernel on each of <I>NA</I> GPU accelerators in parallel
(default: <I>NA</I> = all GPU accelerators on the node). The kernel consists
of a one-dimensional grid of one-dimensional blocks, with <I>NB</I> blocks
(default: <I>NB</I> = number of multiprocessors on the GPU) and <I>NT</I>
threads per block (default: <I>NT</I> = 256). Each GPU thread performs an
independent random walk through the space of subsets of items and keeps track
of the best solution found. After doing a certain number of <I>steps</I>, the
program prints the best of the per-thread solutions for the current
repetition. After doing all the repetitions, the program prints the
best-of-best solution.
<P>
The program prints the knapsack problem and its solution in the following
format. If the <TT>-p</TT> flag is omitted, the <TT>p</TT> and <TT>i</TT>
lines are omitted.
<UL>
<LI>
Lines beginning with <TT>#</TT> are comments.
<LI>
<TT>p zeroOne &lt;C&gt; &lt;N&gt;</TT> &mdash; Defines a zero-one
knapsack problem with knapsack capacity <I>C</I> and <I>N</I> items.
<LI>
<TT>i &lt;j&gt; &lt;W_j&gt; &lt;V_j&gt;</TT> &mdash; Defines the item at
index <I>j</I> with weight <I>W</I><SUB><I>j</I></SUB> and value
<I>V</I><SUB><I>j</I></SUB>.
<LI>
<TT>s &lt;W_total&gt; &lt;V_total&gt;</TT> &mdash; The solution has total
weight <I>W</I><SUB>total</SUB> and total value <I>V</I><SUB>total</SUB>.
<LI>
<TT>k &lt;j1&gt; &lt;j2&gt; ...</TT> &mdash; The solution consists of the
items at indexes <I>j1</I>, <I>j2</I>, and so on.
</UL></div>
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<code><a href="../../../../edu/rit/pj2/Task.html#ALL_CORES">ALL_CORES</a>, <a href="../../../../edu/rit/pj2/Task.html#ALL_GPUS">ALL_GPUS</a>, <a href="../../../../edu/rit/pj2/Task.html#ANY_NODE_NAME">ANY_NODE_NAME</a>, <a href="../../../../edu/rit/pj2/Task.html#DEFAULT_CHUNK">DEFAULT_CHUNK</a>, <a href="../../../../edu/rit/pj2/Task.html#DEFAULT_CORES">DEFAULT_CORES</a>, <a href="../../../../edu/rit/pj2/Task.html#DEFAULT_GPUS">DEFAULT_GPUS</a>, <a href="../../../../edu/rit/pj2/Task.html#DEFAULT_NODE_NAME">DEFAULT_NODE_NAME</a>, <a href="../../../../edu/rit/pj2/Task.html#DEFAULT_SCHEDULE">DEFAULT_SCHEDULE</a>, <a href="../../../../edu/rit/pj2/Task.html#DEFAULT_THREADS">DEFAULT_THREADS</a>, <a href="../../../../edu/rit/pj2/Task.html#dynamic">dynamic</a>, <a href="../../../../edu/rit/pj2/Task.html#fixed">fixed</a>, <a href="../../../../edu/rit/pj2/Task.html#guided">guided</a>, <a href="../../../../edu/rit/pj2/Task.html#leapfrog">leapfrog</a>, <a href="../../../../edu/rit/pj2/Task.html#proportional">proportional</a>, <a href="../../../../edu/rit/pj2/Task.html#STANDARD_CHUNK">STANDARD_CHUNK</a>, <a href="../../../../edu/rit/pj2/Task.html#THREADS_EQUALS_CORES">THREADS_EQUALS_CORES</a></code></li>
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<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><strong><a href="../../../../edu/rit/gpu/example/WalkSackGpu.html#WalkSackGpu()">WalkSackGpu</a></strong>()</code>&nbsp;</td>
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<td class="colFirst"><code>protected static int</code></td>
<td class="colLast"><code><strong><a href="../../../../edu/rit/gpu/example/WalkSackGpu.html#coresRequired()">coresRequired</a></strong>()</code>
<div class="block">This program requires one CPU core.</div>
</td>
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<td class="colFirst"><code>protected static int</code></td>
<td class="colLast"><code><strong><a href="../../../../edu/rit/gpu/example/WalkSackGpu.html#gpusRequired()">gpusRequired</a></strong>()</code>
<div class="block">This program requires all GPU accelerators on the node.</div>
</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../edu/rit/gpu/example/WalkSackGpu.html#main(java.lang.String[])">main</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[]&nbsp;args)</code>
<div class="block">Main program.</div>
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<code><a href="../../../../edu/rit/pj2/Task.html#actualThreads()">actualThreads</a>, <a href="../../../../edu/rit/pj2/Task.html#addTupleListener(edu.rit.pj2.TupleListener)">addTupleListener</a>, <a href="../../../../edu/rit/pj2/Task.html#chunk()">chunk</a>, <a href="../../../../edu/rit/pj2/Task.html#chunk(int)">chunk</a>, <a href="../../../../edu/rit/pj2/Task.html#cores()">cores</a>, <a href="../../../../edu/rit/pj2/Task.html#cores(int)">cores</a>, <a href="../../../../edu/rit/pj2/Task.html#getMatchingTuple(int)">getMatchingTuple</a>, <a href="../../../../edu/rit/pj2/Task.html#gpus()">gpus</a>, <a href="../../../../edu/rit/pj2/Task.html#gpus(int)">gpus</a>, <a href="../../../../edu/rit/pj2/Task.html#groupSize()">groupSize</a>, <a href="../../../../edu/rit/pj2/Task.html#initialChunk()">initialChunk</a>, <a href="../../../../edu/rit/pj2/Task.html#initialSchedule()">initialSchedule</a>, <a href="../../../../edu/rit/pj2/Task.html#initialThreads()">initialThreads</a>, <a href="../../../../edu/rit/pj2/Task.html#matchingTupleCount()">matchingTupleCount</a>, <a href="../../../../edu/rit/pj2/Task.html#nodeName()">nodeName</a>, <a href="../../../../edu/rit/pj2/Task.html#nodeName(java.lang.String)">nodeName</a>, <a href="../../../../edu/rit/pj2/Task.html#nodeNameRequired()">nodeNameRequired</a>, <a href="../../../../edu/rit/pj2/Task.html#parallelDo(int, edu.rit.pj2.Section)">parallelDo</a>, <a href="../../../../edu/rit/pj2/Task.html#parallelDo(edu.rit.pj2.Section...)">parallelDo</a>, <a href="../../../../edu/rit/pj2/Task.html#parallelFor(int, int)">parallelFor</a>, <a href="../../../../edu/rit/pj2/Task.html#parallelFor(long, long)">parallelFor</a>, <a href="../../../../edu/rit/pj2/Task.html#parallelFor(edu.rit.pj2.WorkQueue)">parallelFor</a>, <a href="../../../../edu/rit/pj2/Task.html#putTuple(int, edu.rit.pj2.Tuple)">putTuple</a>, <a href="../../../../edu/rit/pj2/Task.html#putTuple(edu.rit.pj2.Tuple)">putTuple</a>, <a href="../../../../edu/rit/pj2/Task.html#readTuple(T)">readTuple</a>, <a href="../../../../edu/rit/pj2/Task.html#schedule()">schedule</a>, <a href="../../../../edu/rit/pj2/Task.html#schedule(edu.rit.pj2.Schedule)">schedule</a>, <a href="../../../../edu/rit/pj2/Task.html#takeTuple(T)">takeTuple</a>, <a href="../../../../edu/rit/pj2/Task.html#taskRank()">taskRank</a>, <a href="../../../../edu/rit/pj2/Task.html#threads()">threads</a>, <a href="../../../../edu/rit/pj2/Task.html#threads(int)">threads</a>, <a href="../../../../edu/rit/pj2/Task.html#tryToReadTuple(T)">tryToReadTuple</a>, <a href="../../../../edu/rit/pj2/Task.html#tryToTakeTuple(T)">tryToTakeTuple</a>, <a href="../../../../edu/rit/pj2/Task.html#workerFor()">workerFor</a></code></li>
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<h4>WalkSackGpu</h4>
<pre>public&nbsp;WalkSackGpu()</pre>
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<h4>main</h4>
<pre>public&nbsp;void&nbsp;main(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[]&nbsp;args)
throws <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre>
<div class="block">Main program.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../edu/rit/pj2/Task.html#main(java.lang.String[])">main</a></code>&nbsp;in class&nbsp;<code><a href="../../../../edu/rit/pj2/Task.html" title="class in edu.rit.pj2">Task</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>args</code> - Array of zero or more command line argument strings.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code> - The <TT>main()</TT> method can throw any exception.</dd></dl>
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<pre>protected static&nbsp;int&nbsp;coresRequired()</pre>
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<pre>protected static&nbsp;int&nbsp;gpusRequired()</pre>
<div class="block">This program requires all GPU accelerators on the node.</div>
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