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| <h2 title="Class MemoryEstimates" class="title">Class MemoryEstimates</h2> |
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| <pre>public class <span class="typeNameLabel">MemoryEstimates</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">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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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/sysds/utils/MemoryEstimates.html#MemoryEstimates--">MemoryEstimates</a></span>()</code> </td> |
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| <td class="colFirst"><code>static long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/sysds/utils/MemoryEstimates.html#bitSetCost-int-">bitSetCost</a></span>(int length)</code> |
| <div class="block">Get the worst case memory usage of an java.util.BitSet java object.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/sysds/utils/MemoryEstimates.html#byteArrayCost-int-">byteArrayCost</a></span>(int length)</code> |
| <div class="block">Get the worst case memory usage of an array of bytes.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/sysds/utils/MemoryEstimates.html#charArrayCost-int-">charArrayCost</a></span>(int length)</code> |
| <div class="block">Get the worst case memory usage of an array of chars.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/sysds/utils/MemoryEstimates.html#doubleArrayCost-long-">doubleArrayCost</a></span>(long length)</code> |
| <div class="block">Get the worst case memory usage of an array of doubles.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>static double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/sysds/utils/MemoryEstimates.html#intArrayCost-long-">intArrayCost</a></span>(long length)</code> |
| <div class="block">Get the worst case memory usage of an array of integers.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>static double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/sysds/utils/MemoryEstimates.html#longArrayCost-int-">longArrayCost</a></span>(int length)</code> |
| <div class="block">Get the worst case memory usage for an array of longs</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>static long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/sysds/utils/MemoryEstimates.html#objectArrayCost-long-">objectArrayCost</a></span>(long length)</code> |
| <div class="block">Get the worst case memory usage for an array of objects.</div> |
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| <pre>public static long bitSetCost(int 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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| <pre>public static long byteArrayCost(int 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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| <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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| <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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| <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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| <pre>public static long objectArrayCost(long length)</pre> |
| <div class="block">Get the worst case memory usage for an array of objects.</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>public static double longArrayCost(int 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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