When checking application performance, there are several areas that provide clues on whether everything is working within ideal parameters. This reading is critical.
Best practices for performance troubleshooting tools
This is because running low on heap memory will cause your application to perform slower. It can even lead to OutOfMemory exceptions. On the other hand, using little available memory could decrease your memory needs and minimize costs. You have to determine the right frequency at which it should be run since this is a resource-intensive process itself.
Additionally, you need to see if a sufficient amount of memory is freed up. Too many active threads at the same time can slow down the application. It can even slow do the whole server. This is the number of requests that the server can handle for a certain unit of time.
This can help determine your hardware needs. A similar measure to the number of requests is the number of sessions that the server can support at a time. Users are likely to quit if your system takes too long to respond to requests. The Tomcat server comes to your aide in monitoring performance by providing JMX beans for most of these metrics that you can verify using a tool like Tomcat Manager or JavaMelody. Building a REST web service is outside the scope of this piece.
For more information, check out our article on Java Web Services. Also, note that the examples in this article are tested with Tomcat version 9.
Web Application Diagnostics
For other versions, the names of beans or attributes may differ slightly. This contains some minimal information on the server status and the deployed applications, as well as the possibility to deploy a new application. One interesting feature for the purpose of performance monitoring is the possibility of checking for memory leaks:. This is displayed in a text format, as it is intended to be processed by tools. To retrieve data about a specific bean, you can add parameters to the URL that represent the name of the bean and attribute you want:. JavaMelody contains useful graphs for displaying information related to various performance measures, as well as a way to find the values of the Tomcat JMX beans.
Monitoring the used and available memory is helpful both for ensuring proper functioning and statistics purposes.
When the system can no longer create new objects due to lack of memory, the JVM will throw an exception. Also, you should note that a constant increase in memory usage without a corresponding activity level is indicative of a memory leak. The maximum value should of course, not exceed the size of the available physical RAM. To view the available memory, you can inspect the MBean java. Also, the MBean java. In the graph, you can see the highest memory-use reading was MB, while the average is MB of the allocated MB, which means the initial value is more than enough.
Tomcat Monitoring Guide - How to Monitor Apache Tomcat
Of note here is that JavaMelody runs on the same Tomcat server, which does have a small impact on the readings. This is the process through which unused objects are released so that memory can be freed up again. To check these values, you can take a look at the java.
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This shows information about the memory status, duration, and thread count of the last execution of the GC. In the case of the example app, the GC is run at and the graph shows a large percentage of memory is reclaimed. The attributes currentThreadsBusy , currentThreadCount and maxThreads provide information on the number of currently busy threads, the number of threads currently in the thread pool as well as the maximum number of threads that can be created. Alternatively, if the system performs poorly with a high thread count, you can tune and adjust the value.
The maxTime attribute shows the longest time to process a request, while processingTime represents the total time for processing all the requests:. The disadvantage of viewing this MBean directly is that it includes all the requests made to the server.
Tcat -- Enterprise Tomcat Server
Academy Open in new tab. Community Open in new tab. License Portal Open in new tab. Store Open in new tab. Zephyr for Jira has a new name — Zephyr Squad. Learn more. Tomcat Monitor. Applies to ReadyAPI 3. You use Tomcat monitors to check metrics of your Tomcat servers.
Requirements Add the following lines to the Tomcat startup script: You can add these lines anywhere in your startup script -Dcom. Port — The port used to communicate with the server. Password — The password used to connect to the server. Here are some other frequently used metrics: Thread Pool — Current Threads Busy — The percentage of busy threads on the server.
One set of statistics per directory.