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| <h2 title="Class JVM" class="title">Class JVM</h2> |
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| <pre>@InterfaceAudience.Private |
| public class <a href="../../../../../src-html/org/apache/hadoop/hbase/util/JVM.html#line.44">JVM</a> |
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| <div class="block">This class is a wrapper for the implementation of |
| com.sun.management.UnixOperatingSystemMXBean |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
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| <td class="colFirst"><code>private static boolean</code></td> |
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| <td class="colFirst"><code>long</code></td> |
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| <td class="colFirst"><code>long</code></td> |
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| <td class="colFirst"><code>int</code></td> |
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| <div class="block">Workaround to get the current number of process running.</div> |
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| <td class="colFirst"><code>long</code></td> |
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| <div class="block">Get the number of opened filed descriptor for the runtime jvm.</div> |
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| <td class="colFirst"><code>double</code></td> |
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| <td class="colFirst"><code>static boolean</code></td> |
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| <div class="block">Check if the arch is amd64;</div> |
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| <td class="colFirst"><code>static boolean</code></td> |
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| <td class="colFirst"><code>static boolean</code></td> |
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| <div class="block">Check if the OS is linux.</div> |
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| <td class="colFirst"><code>static boolean</code></td> |
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| <div class="block">Check if the OS is unix.</div> |
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| <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a></code></td> |
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| <pre>public long <a href="../../../../../src-html/org/apache/hadoop/hbase/util/JVM.html#line.143">getOpenFileDescriptorCount</a>()</pre> |
| <div class="block">Get the number of opened filed descriptor for the runtime jvm. |
| If Oracle java, it will use the com.sun.management interfaces. |
| Otherwise, this methods implements it (linux only).</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>number of open file descriptors for the jvm</dd> |
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| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/management/OperatingSystemMXBean.html?is-external=true#getSystemLoadAverage--" title="class or interface in java.lang.management"><code>OperatingSystemMXBean.getSystemLoadAverage()</code></a></dd> |
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| <pre>public long <a href="../../../../../src-html/org/apache/hadoop/hbase/util/JVM.html#line.210">getFreeMemory</a>()</pre> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the physical free memory (not the JVM one, as it's not very useful as it depends on |
| the GC), but the one from the OS as it allows a little bit more to guess if the machine is |
| overloaded or not).</dd> |
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| <pre>public int <a href="../../../../../src-html/org/apache/hadoop/hbase/util/JVM.html#line.227">getNumberOfRunningProcess</a>()</pre> |
| <div class="block">Workaround to get the current number of process running. Approach is the one described here: |
| http://stackoverflow.com/questions/54686/how-to-get-a-list-of-current-open-windows-process-with-java</div> |
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| <pre>public long <a href="../../../../../src-html/org/apache/hadoop/hbase/util/JVM.html#line.280">getMaxFileDescriptorCount</a>()</pre> |
| <div class="block">Get the number of the maximum file descriptors the system can use. |
| If Oracle java, it will use the com.sun.management interfaces. |
| Otherwise, this methods implements it (linux only).</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>max number of file descriptors the operating system can use.</dd> |
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