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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.apache.sysds.utils</a></div>
<h2 title="Class MemoryEstimates" class="title">Class MemoryEstimates</h2>
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<li><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">java.lang.Object</a></li>
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<pre>public class <span class="typeNameLabel">MemoryEstimates</span>
extends <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a></pre>
<div class="block">Memory Estimates is a helper class containing static classes that estimate the memory requirements of different types
of objects in java. All estimates are worst case JVM x86-64bit uncompressed object pointers.
This in practice means that the objects are most commonly smaller, for instance the object references are often time.
If the memory pressure is low (there is a low number of allocated objects) then object pointers are 4 bits.</div>
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<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">MemoryEstimates</a></span>()</code></th>
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<td class="colFirst"><code>static double</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#bitSetCost(long)">bitSetCost</a></span>&#8203;(long&nbsp;length)</code></th>
<td class="colLast">
<div class="block">Get the worst case memory usage of an java.util.BitSet java object.</div>
</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>static double</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#booleanArrayCost(long)">booleanArrayCost</a></span>&#8203;(long&nbsp;length)</code></th>
<td class="colLast">
<div class="block">Get the worst case memory usage of an array of booleans.</div>
</td>
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<tr id="i2" class="altColor">
<td class="colFirst"><code>static double</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#byteArrayCost(long)">byteArrayCost</a></span>&#8203;(long&nbsp;length)</code></th>
<td class="colLast">
<div class="block">Get the worst case memory usage of an array of bytes.</div>
</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>static double</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#charArrayCost(long)">charArrayCost</a></span>&#8203;(long&nbsp;length)</code></th>
<td class="colLast">
<div class="block">Get the worst case memory usage of an array of chars.</div>
</td>
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<tr id="i4" class="altColor">
<td class="colFirst"><code>static double</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#doubleArrayCost(long)">doubleArrayCost</a></span>&#8203;(long&nbsp;length)</code></th>
<td class="colLast">
<div class="block">Get the worst case memory usage of an array of doubles.</div>
</td>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code>static double</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#floatArrayCost(long)">floatArrayCost</a></span>&#8203;(long&nbsp;length)</code></th>
<td class="colLast">
<div class="block">Get the worst case memory usage of an array of integers.</div>
</td>
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<tr id="i6" class="altColor">
<td class="colFirst"><code>static double</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#intArrayCost(long)">intArrayCost</a></span>&#8203;(long&nbsp;length)</code></th>
<td class="colLast">
<div class="block">Get the worst case memory usage of an array of integers.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>static double</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#longArrayCost(long)">longArrayCost</a></span>&#8203;(long&nbsp;length)</code></th>
<td class="colLast">
<div class="block">Get the worst case memory usage for an array of longs</div>
</td>
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<tr id="i8" class="altColor">
<td class="colFirst"><code>static double</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#objectArrayCost(long)">objectArrayCost</a></span>&#8203;(long&nbsp;length)</code></th>
<td class="colLast">
<div class="block">Get the worst case memory usage for an array of objects.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>static double</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#stringArrayCost(java.lang.String%5B%5D)">stringArrayCost</a></span>&#8203;(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>[]&nbsp;strings)</code></th>
<td class="colLast">
<div class="block">Get the worst case memory usage of an array containing strings.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>static long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#stringCost(long)">stringCost</a></span>&#8203;(long&nbsp;length)</code></th>
<td class="colLast">
<div class="block">Get the worst case memory usage of a single string, assuming given length.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>static long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#stringCost(java.lang.String)">stringCost</a></span>&#8203;(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;value)</code></th>
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<div class="block">Get the worst case memory usage of a single string.</div>
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<h4>MemoryEstimates</h4>
<pre>public&nbsp;MemoryEstimates()</pre>
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<pre class="methodSignature">public static&nbsp;double&nbsp;bitSetCost&#8203;(long&nbsp;length)</pre>
<div class="block">Get the worst case memory usage of an java.util.BitSet java object.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>length</code> - The length of the array.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The memory estimate in bytes</dd>
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<h4>booleanArrayCost</h4>
<pre class="methodSignature">public static&nbsp;double&nbsp;booleanArrayCost&#8203;(long&nbsp;length)</pre>
<div class="block">Get the worst case memory usage of an array of booleans.
Unfortunately in java booleans are allocated as bytes.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>length</code> - The length of the array.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The memory estimate in bytes.</dd>
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<h4>byteArrayCost</h4>
<pre class="methodSignature">public static&nbsp;double&nbsp;byteArrayCost&#8203;(long&nbsp;length)</pre>
<div class="block">Get the worst case memory usage of an array of bytes.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>length</code> - The length of the array.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The memory estimate in bytes</dd>
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<h4>charArrayCost</h4>
<pre class="methodSignature">public static&nbsp;double&nbsp;charArrayCost&#8203;(long&nbsp;length)</pre>
<div class="block">Get the worst case memory usage of an array of chars.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>length</code> - The length of the array.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The memory estimate in bytes</dd>
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<h4>intArrayCost</h4>
<pre class="methodSignature">public static&nbsp;double&nbsp;intArrayCost&#8203;(long&nbsp;length)</pre>
<div class="block">Get the worst case memory usage of an array of integers.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>length</code> - The length of the array.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The memory estimate in bytes</dd>
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<pre class="methodSignature">public static&nbsp;double&nbsp;floatArrayCost&#8203;(long&nbsp;length)</pre>
<div class="block">Get the worst case memory usage of an array of integers.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>length</code> - The length of the array.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The memory estimate in bytes.</dd>
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<pre class="methodSignature">public static final&nbsp;double&nbsp;doubleArrayCost&#8203;(long&nbsp;length)</pre>
<div class="block">Get the worst case memory usage of an array of doubles.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>length</code> - The length of the array.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The memory estimate in bytes</dd>
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<h4>objectArrayCost</h4>
<pre class="methodSignature">public static final&nbsp;double&nbsp;objectArrayCost&#8203;(long&nbsp;length)</pre>
<div class="block">Get the worst case memory usage for an array of objects.
Note this does not take into account each objects allocated variables, just the objects themselves.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>length</code> - The length of the array.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The memory estimate in bytes</dd>
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<h4>longArrayCost</h4>
<pre class="methodSignature">public static final&nbsp;double&nbsp;longArrayCost&#8203;(long&nbsp;length)</pre>
<div class="block">Get the worst case memory usage for an array of longs</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>length</code> - The length of the array.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The memory estimate in bytes</dd>
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<pre class="methodSignature">public static final&nbsp;double&nbsp;stringArrayCost&#8203;(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>[]&nbsp;strings)</pre>
<div class="block">Get the worst case memory usage of an array containing strings.
In case anyone is wondering ... strings are expensive.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>strings</code> - The strings array.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The array memory cost</dd>
</dl>
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<h4>stringCost</h4>
<pre class="methodSignature">public static&nbsp;long&nbsp;stringCost&#8203;(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;value)</pre>
<div class="block">Get the worst case memory usage of a single string.
In case anyone is wondering ... strings are expensive.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>value</code> - The String to measure</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The size in memory.</dd>
</dl>
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<h4>stringCost</h4>
<pre class="methodSignature">public static&nbsp;long&nbsp;stringCost&#8203;(long&nbsp;length)</pre>
<div class="block">Get the worst case memory usage of a single string, assuming given length.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>length</code> - The length of the string</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The size in memory</dd>
</dl>
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