I'm new to Apache Jmeter here.
While reading user manual documents of Jmeter, I see this:
View Results Tree MUST NOT BE USED during load test as it consumes a lot of resources (memory and CPU). Use it only for either functional testing or during Test Plan debugging and Validation.
The above statement is taken from this document, just under the View Results Tree section
http://jmeter.apache.org/usermanual/component_reference.html#Save_Responses_to_a_file
I want to ask how I can use Listeners that is "MUST NOT BE USED during load test..."?
in GUI mode, Jmeter Apache.
Any suggest is appreciated.
GUI mode is only for creating & debugging your test. So, You can use any listeners you want which will help you to debug your test. Once your test is created/updated, remove/disable those listeners. When you actually do the loadtest with Jmeter, You need to run your test in Non-GUI mode. This site has really good information on using JMeter.
http://blazemeter.com/blog/jmeter-performance-and-tuning-tips
When you run in non-gui mode, you pass the argument for the location where the result file should be created. Later you can import the result file in JMeter for analysis.
Related
When I run Jmeter from Windows CLI, after some random time, the tests are being stopped or stuck. I can click on ctrl+C (one time) just to refresh the run but part of the request will be lost during the time it was stuck.
Take a look at jmeter.log file, normally it should be possible to figure out what's wrong by looking at messages there. If you don't see any suspicious entries there - you can increase JMeter's logging verbosity by changing values in logj2.xml file or via -L command-line parameters.
Take a thread dump and see what exactly threads are doing when they're "stuck"
If you're using HTTP Request samplers be aware that JMeter will wait for the result forever and if the application fails to respond at all - your test will never end so you need to set reasonable timeouts.
Make sure to follow JMeter Best Practices
Take a look at resources consumption like CPU, RAM, etc. - if your machine is overloaded and cannot conduct the required load you will need to switch to distributed testing
There are several approaches to debugging a JMeter test which can be combined as a general systematic approach that I capable of diagnosing most problems.
The first thing that I would suggest is running the test within the JMeter GUI to visualize the test execution. For this you may want to add a View Results Tree listener which will provide you with real time results from each request generated:
Another way you can monitor your test execution in real time within the JMeter GUI is with the Log Viewer. If any exceptions are encountered during your test execution you will see detailed output in this window. This can be found under the Options menu:
Beyond this, JMeter records output files which are often very useful in debugging you load tests. Both the .log file and the .jtl file will provide a time stamped history of every action your test performs. From there you can likely track down the offending request or error if your test unexpectedly hangs:
If you do decide to move your test into the cloud using a service that hosts your test, you may be able to ascertain more information through that platform. Here is a comprehensive example on how to debug JMeter load tests that covers the above approaches as well as more advanced concepts. Using a cloud load test provider can provide your test will additional network and machine resources beyond what your local machine can, if the problem is related to a performance bottleneck.
For non-gui JMeter, there is much info available about how to take a report. which is basically done by mentioning report name in command and not adding any listener in Test Plan
But I use a different approach. Please confirm whether it compromises the performance of JMeter or it is as good as mentioned in the 1st paragraph.
I add Listener in Test plan and mention filename in the listener. Do my configure settings. Close the Test plan and run it in NON-GUI mode with the following command.
jmeter -n -t ProjectName.jmx
It is better to use first approach, in which you define the path of report file within your command. It is considered most efficient approach.
An alternative to above is adding 'simple data writer' listener to your test plan. Define the path of report in this listener and run the jmeter script from command line. This is also resource efficient approach. It is similar to your approach. Only difference is that instead of enabling multiple listeners, enable only one listener that is 'simple data writer'. You can later use report generated by this listener in different listeners and generate graphs as required.
To cut it short, resource usage depends upon on choice of listener. Command line mode uses lightest listener by default. If you don't want to mention it in command-line; then enable 'simple data writer' with in your GUI plan. Hope you understand the concept.
I want to use the following Listeners, but as part of my *.jtl file results
View Results Tree
Aggregate Report
jp#gc - Response Times Percentiles
jp#gc - Response Times over Time
Now, since high volume Load Tests run in non-gui mode, so these Listeners have no value. But perhaps they have value when we generate reports after we generate the jtl file. How can that be acheived? Is there some setting in user.properties? Which can enable these listeners? at Report time generation.
I am beginner for jmeter and I configured and run the script with help of Google materials but I am not sure about picking the right listener for the performance testing and metrics in the graph.
can you please guide me to add respective listeners and what kind of listeners to be added for Application server,database server,network server,web server testing?
Thanks for help
JMeter is load testing tool and not a profiler. So there are no specific listeners for application server,DB server and all.
It works on http/https requests to produce load on target server. While scripting you can have as many listeners as you want to verify the script correctness and sample test runs.
But while actual load test minimal no. of listeners should be used. Listeners are for presenting the data which are cpu,memory intensive especially view results tree, view results table etc. should be avoided in actual load test.
Test should be carried out in non-ui mode for heavy load generation. Please have a look at ctrl+H (help, press ctrl+h on any component and this will show help) for all components available in JMeter from JMeter. Then probably you should be able to decide which ones are best for you.
Hope this helps :)
If you want to monitor server-side components health the best option is using PerfMon extension available via JMeter Plugins. You can collect different performance metrics like:
CPU usage
RAM usage
Network IO
Disk IO
In regards to JMeter bundled listeners: you can use all of them, but after tests execution. All the listeners are able to read .jtl results file and populate tables, graphs, etc. from it. For more recommendations see JMeter Performance and Tuning Tips guide
I am using jmeter for load and performance testing. I am able to successfully generate summary report by using only one user as load. But, if I want to generate summary report for multiple users (say 100 users), how can I configure jmeter GUI to generate summary report?
Thanks in advance :)
JMeter doesn't care about number of users. The only thing to consider: don't use JMeter GUI to perform load test itself.
The easiest approach to use:
Configure your test as required. JMeter GUI can be used at this stage.
Run your test in non-GUI console mode as follows:
jmeter -n -t /path/to/your/test.jmx -l /path/to/test/results.jtl
After load test open JMeter GUI (even empty test plan)
Add the listener of your choice, i.e. Summary Report
Click "Browse" button and open your /path/to/test/results.jtl
Perform analysis, raise bugs, etc.
Also make sure that you're following other recommendations from JMeter Performance and Tuning Tips guide.
You have to put the Summary Report controller at the top level, just beside (not inside) the Thread Group. Otherways, its scope becomes a single thread, which is not useful.
We had scripted an .exe application in load runner and We would like to try it out with JMeter.
The script is very complex and I'm not sure if JMeter could support it, any possibilities available?
I have been a devoted user of Apache JMeter for the past decade and it does offer helpful web load testing functionality for free. Here are some pointers that may help determine if JMeter is right for you:
Apache JMeter is a Java application, so it does have upper limits on resources (memory, sockets, threads). These resources can often be increased or consumption optimized (standard JVM args or jmeter.properties file) for better performance under heavy load testing.
When capturing scripts using the "HTTP Proxy Server" node, make sure that you have a "User Defined Variables" node created and populated with your name/value pairs for the test. This will trigger a variable substitution in the proxy server. This is invaluable when you want to parameterize the script.
As with tree based structures, position determines scope. Make sure that you isolate actions under the proper node or else they will execute for everything at the same scope.
For simulated delays, I have had a good run with the "Uniform Random Timer" where you can specify a lower and upper limit.
For validation, the "Response Assertion" is helpful for raw strings and regular expressions.
For variable extraction, the "Regular Expression Extractor" allows you to extract a value from a page and reference it in a variable for the rest of the test. Node scope appears to be treated as global for these extractors.
When watching the test, "Aggregate Graph" is helpful. "View Results Tree" is useful when troubleshooting, but adds extra memory usage to tests and can cause heavy tests to fail. Note that if you save the results on a listener node, you can reload those results in the control at a later time. Also, if you highlight the table in "Aggregate Graph" or "Aggregate Report", you can paste the results into Excel directly. Very helpful for reporting.
Hopefully this gives you an idea of some of the value and gotchas with Apache JMeter.
You have built a test script within Load Runner and you want it to simply run in JMeter — that's not gonna happen. These are two different test tools.
Rebuild the script in JMeter and it will run as smoothly as your script with Load Runner.
Now you can execute JMeter script inside Load Runner, check
How-to run JMeter test in LoadRunner:
Starting with Micro Focus LoadRunner (LR) 12.55 and Performance Center (PC) 12.55, you can execute JMeter tests in addition to other LoadRunner scripts.
Setting for LoadRunner scenario with a JMeter test:
Open LR Controller
Select the JMeter Scripts radio button
Press the Browse… button
Select JMeter Test file (e.g. Test_1.jmx) and click Open
Click OK button on the next window