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| <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav> <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>IoTDB User Guide (V0.8.x)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>0-Get Started</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>1-Overview</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>2-Concept Key Concepts and Terminology</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>3-Operation Manual</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>4-Deployment and Management</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/UserGuide/V0.8.x/4-Deployment and Management/1-Deployment.html" class="sidebar-link">Deployment</a></li><li><a href="/UserGuide/V0.8.x/4-Deployment and Management/2-Configuration.html" class="sidebar-link">Configuration</a></li><li><a href="/UserGuide/V0.8.x/4-Deployment and Management/3-System Monitor.html" class="sidebar-link">System Monitor</a></li><li><a href="/UserGuide/V0.8.x/4-Deployment and Management/4-Performance Monitor.html" class="active sidebar-link">Performance Monitor</a></li><li><a href="/UserGuide/V0.8.x/4-Deployment and Management/5-System log.html" class="sidebar-link">System log</a></li><li><a href="/UserGuide/V0.8.x/4-Deployment and Management/6-Data Management.html" class="sidebar-link">Data Management</a></li><li><a href="/UserGuide/V0.8.x/4-Deployment and Management/7-Build and use IoTDB by Dockerfile.html" class="sidebar-link">Dockerfile</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>5-IoTDB SQL Documentation</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>6-JDBC API</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>7-TsFile</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>8-System Tools</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="performance-monitor"><a href="#performance-monitor" class="header-anchor">#</a> Performance Monitor</h1> <h2 id="introduction"><a href="#introduction" class="header-anchor">#</a> Introduction</h2> <p>In order to grasp the performance of iotdb, we add this module to count the time-consuming of each operation. This module can statistic the avg time-consuming of each operation and the proportion of each operation fall into a time range. The output is in log_measure.log file. A output example is in below.</p> <img src="https://user-images.githubusercontent.com/13203019/60937461-14296f80-a303-11e9-9602-a7bed624bfb3.png" style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;"> <h2 id="configuration-parameter"><a href="#configuration-parameter" class="header-anchor">#</a> Configuration parameter</h2> <p>location：conf/iotdb-engine.properties</p> <center>**Table -parameter and description** |
| <table><thead><tr><th style="text-align:left;">Parameter</th> <th style="text-align:left;">Default Value</th> <th style="text-align:left;">Description</th></tr></thead> <tbody><tr><td style="text-align:left;">enable_performance_stat</td> <td style="text-align:left;">false</td> <td style="text-align:left;">Is stat performance of sub-module enable.</td></tr> <tr><td style="text-align:left;">performance_stat_display_interval</td> <td style="text-align:left;">60000</td> <td style="text-align:left;">The interval of display statistic result in ms.</td></tr> <tr><td style="text-align:left;">performance_stat_memory_in_kb</td> <td style="text-align:left;">20</td> <td style="text-align:left;">The memory used for performance_stat in kb.</td></tr></tbody></table></center> <h2 id="jmx-mbean"><a href="#jmx-mbean" class="header-anchor">#</a> JMX MBean</h2> <p>Connect to jconsole with port 31999，and choose ‘MBean’in menu bar. Expand the sidebar and choose 'org.apache.iotdb.db.cost.statistic'. You can Find：</p> <img src="https://user-images.githubusercontent.com/13203019/60937484-30c5a780-a303-11e9-8e92-04c413df2088.png" style="width:100%;max-width:600px;max-height:200px;margin-left:auto;margin-right:auto;display:block;"> <p><strong>Attribute</strong></p> <ol><li><p>EnableStat：Whether the statistics are enable or not, if it is true, the module records the time-consuming of each operation and prints the results; It can not be set dynamically but changed by function in below.</p></li> <li><p>DisplayIntervalInMs：The interval between print results. It can be set dynamically, but will take effect after restart.( First call stopStatistic(), then call startContinuousStatistics() or startOneTimeStatistics()）</p></li> <li><p>OperationSwitch：It's a map to indicate whether stat the operation, the key is operation name and the value is stat state. This parameter cannot be changed directly, it's change by operation 'changeOperationSwitch()'.</p></li></ol> <p><strong>Operation</strong></p> <ol><li>startContinuousStatistics： Start the statistics and output at interval of ‘DisplayIntervalInMs’.</li> <li>startOneTimeStatistics：Start the statistics and output in delay of ‘DisplayIntervalInMs’.</li> <li>stopStatistic：Stop the statistics.</li> <li>clearStatisticalState(): clear current stat result, reset statistical result.</li> <li>changeOperationSwitch(String operationName, Boolean operationState):set whether to monitor operation status. The param 'operationName' is the name of operation, defined in attribute operationSwitch. The param operationState is the state of operation. If state-switch successful the function will return true, else return false.</li></ol> <h2 id="adding-custom-monitoring-items-for-developer-of-iotdb"><a href="#adding-custom-monitoring-items-for-developer-of-iotdb" class="header-anchor">#</a> Adding Custom Monitoring Items for developer of IOTDB</h2> <p><strong>Add Operation</strong></p> <p>Add an enumeration in org.apache.iotdb.db.cost.statistic.Operation.</p> <p><strong>Add Timing Code in Monitoring Area</strong></p> <p>Add timing code in the monitoring start area:</p> <div class="language- extra-class"><pre><code>long t0 = System. currentTimeMillis(); |
| </code></pre></div><p>Add timing code in the monitoring stop area:</p> <div class="language- extra-class"><pre><code>Measurement.INSTANCE.addOperationLatency(Operation, t0); |
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