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Project28JMeter/ApacheJmeter/xdocs/usermanual/build-monitor-test-plan.xml
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<?xml version="1.0"?> | |
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<!DOCTYPE document | |
[ | |
<!ENTITY sect-num '13'> | |
]> | |
<document prev="build-jms-topic-test-plan.html" next="listeners.html" id="$Id: build-monitor-test-plan.xml 1175606 2011-09-25 22:28:22Z sebb $"> | |
<properties> | |
<title>User's Manual: Building a Monitor Test Plan</title> | |
</properties> | |
<body> | |
<section name="§-num;. Building a Monitor Test Plan" anchor="building"> | |
<p>In this section, you will learn how to create a | |
<a href="build-test-plan.html">Test Plan</a> to monitor webservers. Monitors | |
are useful for a stress testing and system management. Used with stress | |
testing, the monitor provides additional information about server performance. | |
It also makes it easier to see the relationship between server performance | |
and response time on the client side. As a system administration tool, the | |
monitor provides an easy way to monitor multiple servers from one console. | |
The monitor was designed to work with the status servlet in Tomcat 5. In | |
theory, any servlet container that supports JMX (Java Management Extension) | |
can port the status servlet to provide the same information.</p> | |
<p>For those who want to use the monitor with other servlet or EJB containers, | |
Tomcat's status servlet should work with other containers for the memory | |
statistics without any modifications. To get thread information, you will | |
need to change the MBeanServer lookup to retrieve the correct MBeans.</p> | |
</section> | |
<section name="§-num;.1 Adding A Server" anchor="adding_server"> | |
<p>The first step is to add a <a href="test_plan.html#thread_group">Thread Group</a> | |
element. The Thread Group tells JMeter the number of threads you want. Always use | |
1, since we are using JMeter as a monitor. This is very important for those not | |
familiar with server monitors. As a general rule, using multiple threads for a | |
single server is bad and can create significant stress. | |
</p> | |
<p>Go ahead and add the ThreadGroup element by first selecting the Test Plan, | |
clicking your right mouse button to get the Add menu, and then select | |
Add --> ThreadGroup.</p> | |
<p>You should now see the Thread Group element under Test Plan. If you do not | |
see the element, "expand" the Test Plan tree by clicking on the Test Plan element.</p> | |
<figure image="webtest/threadgroup.png"> | |
Figure §-num;.1. Thread Group with Default Values</figure> | |
<p>Change the loop count to forever (or some large number) so that enough samples are generated.</p> | |
</section> | |
<section name="§-num;.2 HTTP Auth Manager" anchor="adding_auth"> | |
<p>Add the <complink name="HTTP Authorization Manager"/> to the Thread Group element | |
(Add --> Config element --> HTTP Authorization Manager). Enter the username | |
and password for your webserver. Important note: the monitor only works with | |
Tomcat5 build 5.0.19 and newer. For instructions on how to setup Tomcat, please | |
refer to tomcat 5 documentation.</p> | |
<ol> | |
<li> leave the base URL blank</li> | |
<li> enter the username</li> | |
<li> enter the password</li> | |
</ol> | |
</section> | |
<section name="§-num;.3 Adding HTTP Request" anchor="adding_request"> | |
<p>Add the <complink name="HTTP Request"/> to the Thread Group element | |
(Add --> Sampler --> HTTP Request). Then, select the HTTP Request element | |
in the tree and edit the following properties): | |
<ol> | |
<li>Change the Name field to "Server Status".</li> | |
<li>Enter the IP address or Hostname</li> | |
<li>Enter the port number</li> | |
<li>Set the Path field to "/manager/status" if you're using Tomcat.</li> | |
<li>Add a request parameter named "XML" in uppercase. Give it a value of | |
"true" in lowercase.</li> | |
<li>Check "Use as Monitor" at the bottom of the sampler</li> | |
</ol> | |
</p> | |
</section> | |
<section name="§-num;.4 Adding Constant Timer" anchor="adding_timer"> | |
<p>Add a timer to this thread group (Add --> Timer --> Constant Timer). | |
Enter 5000 milliseconds in the "Thread Delay" box. In general, using intervals shorter | |
than 5 seconds will add stress to your server. Find out what is an acceptable interval | |
before you deploy the monitor in your production environment.</p> | |
</section> | |
<section name="§-num;.5 Adding a Listener to Store the Results" anchor="adding_listener"> | |
<p>If you want to save the raw results from the server, add a simple data | |
<a href="component_reference.html#listeners">Listener</a>. If you want to save the | |
calculated statistics, enter a filename in the listener. If you want to save both | |
the raw data and statistics, make sure you use different filenames.</p> | |
<p>Select the thread group element and add a <complink name="Simple Data Writer"/> listener | |
(Add --> Listener --> Simple Data Writer). Next, you need to specify a directory | |
and filename of the output file. You can either type it into the filename field, or | |
select the Browse button and browse to a directory and then enter a filename.</p> | |
</section> | |
<section name="§-num;.6 Adding Monitor Results" anchor="add_monitor_listener"> | |
<p>Add the <a href="component_reference.html#listeners">Listener</a> by selecting the | |
test plan element (Add --> Listener -- > Monitor Results). | |
<br></br> | |
By default, the Listener will select the results from the first connector in the sample response. | |
The Connector prefix field can be used to select a different connector. | |
If specified, the Listener will choose the first connector which matches the prefix. | |
If no match is found, then the first connector is selected. | |
</p> | |
<p>There are two tabs in | |
the monitor results listener. The first is the "Health", which displays the status of | |
the last sample the monitor received. The second tab is "Performance", which shows a | |
historical view of the server's performance. | |
</p> | |
<figure image="monitor_health.png"/> | |
<p>A quick note about how health is calculated. Typically, a server will crash if | |
it runs out of memory, or reached the maximum number of threads. In the case of | |
Tomcat 5, once the threads are maxed out, requests are placed in a queue until a | |
thread is available. The relative importance of threads vary between containers, so | |
the current implementation uses 50/50 to be conservative. A container that is more | |
efficient with thread management might not see any performance degradation, but | |
the used memory definitely will show an impact.</p> | |
<figure image="monitor_screencap.png"/> | |
<p>The performance graph shows for different lines. The free memory line shows how | |
much free memory is left in the current allocated block. Tomcat 5 returns the maximum | |
memory, but it is not graphed. In a well tuned environment, the server should never | |
reach the maximum memory.</p> | |
<p>Note the graph has captions on both sides of the graph. On the left is percent and | |
the right is dead/healthy. If the memory line spikes up and down rapidly, it could | |
indicate memory thrashing. In those situations, it is a good idea to profile the | |
application with Borland OptimizeIt or JProbe. What you want to see is a regular | |
pattern for load, memory and threads. Any erratic behavior usually indicates poor | |
performance or a bug of some sort.</p> | |
</section> | |
</body> | |
</document> |