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Project28JMeter/ApacheJmeter/xdocs/usermanual/glossary.xml
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<?xml version="1.0"?> | |
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Licensed to the Apache Software Foundation (ASF) under one or more | |
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The ASF licenses this file to You under the Apache License, Version 2.0 | |
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<!DOCTYPE document | |
[ | |
<!ENTITY sect-num '22'> | |
]> | |
<document prev="hints_and_tips.html" id="$Id: glossary.xml 1175606 2011-09-25 22:28:22Z sebb $"> | |
<properties> | |
<title>User's Manual: Glossary</title> | |
</properties> | |
<body> | |
<section name="§-num;. Glossary" anchor="glossary"> | |
<p> | |
<a name="Elapsed"><b>Elapsed time</b></a>. JMeter measures the elapsed time from just before sending the request to | |
just after the last response has been received. | |
JMeter does not include the time needed to render the response, nor does JMeter process any client code, for example | |
Javascript. | |
</p> | |
<p> | |
<a name="Latency"><b>Latency</b></a>. JMeter measures the latency from just before sending the request to | |
just after the first response has been received. Thus the time | |
includes all the processing needed to assemble the request as well as | |
assembling the first part of the response, which in general will be longer than one | |
byte. | |
Protocol analysers (such as Wireshark) measure the time when bytes are actually sent/received over the interface. | |
The JMeter time should be closer to that which is experienced by a | |
browser or other application client. | |
</p> | |
<p> | |
<a name="Median"><b>Median</b></a> is a number which divides the samples into two equal halves. | |
Half of the samples are smaller than the median, and half are larger. | |
[Some samples may equal the median.] | |
This is a standard statistical measure. | |
See, for example: <a href="http://en.wikipedia.org/wiki/Median">Median</a> entry at Wikipedia. | |
The Median is the same as the 50<sup>th</sup> Percentile | |
</p> | |
<p> | |
<a name="Percentile"><b>90% Line (90<sup>th</sup> Percentile)</b></a> is the value below which 90% of the samples fall. | |
The remaining samples too at least as long as the value. | |
This is a standard statistical measure. | |
See, for example: <a href="http://en.wikipedia.org/wiki/Percentile">Percentile</a> entry at Wikipedia. | |
</p> | |
<p> | |
<a name="StandardDeviation"><b>Standard Deviation</b></a> is a measure of the variability | |
of a data set. This is a standard statistical measure. | |
See, for example: <a href="http://en.wikipedia.org/wiki/Standard_deviation">Standard Deviation</a> entry at Wikipedia. | |
JMeter calculates the population standard deviation (e.g. STDEVP function in spreadheets), not the sample standard deviation (e.g. STDEV). | |
</p> | |
<p> | |
<a name="ThreadName">The <b>Thread Name</b></a> as it appears in Listeners and logfiles | |
is derived from the Thread Group name and the thread within the group.<br/> | |
The name has the format | |
<code>groupName + " " + groupIndex + "-" + threadIndex</code> | |
where: | |
<ul> | |
<li>groupName - name of the Thread Group element</li> | |
<li>groupIndex - number of the Thread Group in the Test Plan, starting from 1</li> | |
<li>threadIndex - number of the thread within the Thread Group, starting from 1</li> | |
</ul> | |
A test plan with two Thread Groups each with two threads would use the names: | |
<pre> | |
Thread Group 1-1 | |
Thread Group 1-2 | |
Thread Group 2-1 | |
Thread Group 2-2 | |
</pre> | |
</p> | |
<p> | |
<a name="Throughput"><b>Throughput</b></a> is calculated as requests/unit of time. | |
The time is calculated from the start of the first sample to the end of the last sample. | |
This includes any intervals between samples, as it is supposed to represent the load on the server.<br/> | |
The formula is: Throughput = (number of requests) / (total time). | |
</p> | |
</section> | |
</body> | |
</document> |