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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"/>
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<title>Apache JMeter - User's Manual: Glossary</title>
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<a href="http://www.apache.org"><img title="Apache Software Foundation" width="387" height="100" src="../images/asf-logo.gif" border="0"/></a>
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<a href="http://jmeter.apache.org/"><img width="221" height="102" src="../images/logo.jpg" alt="Apache JMeter" title="Apache JMeter" border="0"/></a>
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<!-- LEFT SIDE NAVIGATION -->
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<p><strong>About</strong></p>
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<li><a href="../index.html">Overview</a>
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<p><strong>Documentation</strong></p>
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<li><a href="../usermanual/index.html">User Manual</a>
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<li><a href="../building.html">Building JMeter and Add-Ons</a>
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<p><strong>Tutorials (PDF format)</strong></p>
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<li><a href="../usermanual/jmeter_distributed_testing_step_by_step.pdf">Distributed Testing</a>
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<li><a href="../usermanual/jmeter_proxy_step_by_step.pdf">Recording Tests</a>
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<li><a href="../usermanual/junitsampler_tutorial.pdf">JUnit Sampler</a>
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<li><a href="../usermanual/jmeter_accesslog_sampler_step_by_step.pdf">Access Log Sampler</a>
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<li><a href="../extending/jmeter_tutorial.pdf">Extending JMeter</a>
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<li><a href="http://www.apache.org/foundation/getinvolved.html">Get Involved</a>
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<p><strong>Foundation</strong></p>
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<ul>
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<li><a href="http://www.apache.org/">ASF</a>
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<li><a href="http://www.apache.org/foundation/sponsorship.html">Sponsorship</a>
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<li><a href="http://www.apache.org/foundation/thanks.html">Thanks</a>
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<td width="80%" align="left" valign="top">
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<td bgcolor="#525D76">
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<div align="right"><a href="index.html"><font size=-1 color="#ffffff" face="arial,helvetica,sanserif">Index</font></a></div>
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<td bgcolor="#525D76">
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<div align="right"><a href="hints_and_tips.html"><font size=-1 color="#ffffff" face="arial,helvetica,sanserif">Prev</font></a></div>
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</td>
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</table>
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<br>
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<table border="0" cellspacing="0" cellpadding="2" width="100%">
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<tr><td bgcolor="#525D76">
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<font color="#ffffff" face="arial,helvetica,sanserif">
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<a name="glossary"><strong>22. Glossary</strong></a><a class="sectionlink" href="#glossary" title="Link to here">¶</a></font>
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</td></tr>
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<tr><td>
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<blockquote>
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<p>
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<a name="Elapsed">
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<b>
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Elapsed time
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</b>
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</a>
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. JMeter measures the elapsed time from just before sending the request to
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just after the last response has been received.
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JMeter does not include the time needed to render the response, nor does JMeter process any client code, for example
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Javascript.
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</p>
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<p>
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<a name="Latency">
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<b>
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Latency
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</b>
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</a>
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. JMeter measures the latency from just before sending the request to
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just after the first response has been received. Thus the time
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includes all the processing needed to assemble the request as well as
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assembling the first part of the response, which in general will be longer than one
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byte.
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Protocol analysers (such as Wireshark) measure the time when bytes are actually sent/received over the interface.
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The JMeter time should be closer to that which is experienced by a
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browser or other application client.
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</p>
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<p>
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<a name="Median">
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<b>
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Median
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</b>
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</a>
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is a number which divides the samples into two equal halves.
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Half of the samples are smaller than the median, and half are larger.
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[Some samples may equal the median.]
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This is a standard statistical measure.
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See, for example:
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<a href="http://en.wikipedia.org/wiki/Median">
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Median
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</a>
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entry at Wikipedia.
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The Median is the same as the 50
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<sup>
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th
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</sup>
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Percentile
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</p>
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<p>
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<a name="Percentile">
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<b>
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90% Line (90
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<sup>
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th
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</sup>
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Percentile)
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</b>
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</a>
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is the value below which 90% of the samples fall.
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The remaining samples too at least as long as the value.
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This is a standard statistical measure.
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See, for example:
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<a href="http://en.wikipedia.org/wiki/Percentile">
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Percentile
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</a>
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entry at Wikipedia.
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</p>
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<p>
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<a name="StandardDeviation">
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<b>
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Standard Deviation
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</b>
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</a>
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is a measure of the variability
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of a data set. This is a standard statistical measure.
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See, for example:
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<a href="http://en.wikipedia.org/wiki/Standard_deviation">
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Standard Deviation
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</a>
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entry at Wikipedia.
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JMeter calculates the population standard deviation (e.g. STDEVP function in spreadheets), not the sample standard deviation (e.g. STDEV).
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</p>
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<p>
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<a name="ThreadName">
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The
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<b>
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Thread Name
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</b>
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</a>
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as it appears in Listeners and logfiles
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is derived from the Thread Group name and the thread within the group.
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<br>
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The name has the format
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<code>
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groupName + " " + groupIndex + "-" + threadIndex
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</code>
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where:
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<ul>
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<li>
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groupName - name of the Thread Group element
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</li>
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<li>
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groupIndex - number of the Thread Group in the Test Plan, starting from 1
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</li>
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<li>
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threadIndex - number of the thread within the Thread Group, starting from 1
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</li>
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</ul>
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A test plan with two Thread Groups each with two threads would use the names:
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<pre>
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Thread Group 1-1
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Thread Group 1-2
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Thread Group 2-1
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Thread Group 2-2
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</pre>
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</p>
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<p>
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<a name="Throughput">
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<b>
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Throughput
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</b>
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</a>
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is calculated as requests/unit of time.
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The time is calculated from the start of the first sample to the end of the last sample.
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This includes any intervals between samples, as it is supposed to represent the load on the server.
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<br>
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The formula is: Throughput = (number of requests) / (total time).
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</p>
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</blockquote>
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</p>
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</td></tr>
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<tr><td><br></td></tr>
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</table>
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<table>
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<tr>
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<td bgcolor="#525D76">
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<div align="right"><a href="index.html"><font size=-1 color="#ffffff" face="arial,helvetica,sanserif">Index</font></a></div>
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</td>
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<td bgcolor="#525D76">
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<div align="right"><a href="hints_and_tips.html"><font size=-1 color="#ffffff" face="arial,helvetica,sanserif">Prev</font></a></div>
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</td>
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</tr>
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</table>
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<br>
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</td>
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</tr>
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<tr><td colspan="2">
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<hr noshade size="1"/>
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</td></tr>
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<tr><td colspan="2">
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<div align="center"><font color="#525D76" size="-1"><em>
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Copyright © 1999-2012, Apache Software Foundation
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</em></font></div>
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</td></tr>
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<tr><td colspan="2">
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<div align="center"><font color="#525D76" size="-1">
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Apache, Apache JMeter, JMeter, the Apache feather, and the Apache JMeter logo are
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trademarks of the Apache Software Foundation.
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</font>
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</div>
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</body>
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