I'm trying to test an application with a typical resonse times of 0.2-0.4 milliseconds with Apache JMeter. I've found "jp#gc - Response Times Over Time" plugin that is able to display such response times as a graph but all available listeners (inluding jp#gc Flexible Data Writer) can save results in a file (for detailed analysis) only at a milliseconds precision. Are there any way in JMeter to save response time at microseconds precision?
There is commented lines in jmeter.properties file:
# Whether to use System.nanoTime() - otherwise only use System.currentTimeMillis()
#sampleresult.useNanoTime=true
I think if you'll uncomment this option, you'll have higher resolution JMeter results.
Related
Just starting with jmeter and making some experiments I found something that looks kind of odd to me. I connected jmeter with influxdb and measured the avg. time response of one single request in a infinite loop. When I stopped the test I realized that the last time in the results csv created by jmeter is not the same as the one taken by influxdb. Specifically jmeter last measure is 13s higher than the one registered by influxdb. Any ideas on what could be happening?
I've tried to google it but haven't found any documentation or problem related
JMeter sends aggregated metrics, to wit it doesn't send each and every SampleResult but collects the results within some "window", default value is 5 seconds, controllable via backend_influxdb.send_interval JMeter Property
And metrics which are being sent are described here
You can try decreasing the 5 seconds window by amending the aforementioned backend_influxdb.send_interval JMeter property and setting it i.e. to 1000 ms so JMeter would send the data more often but it will create extra overhead so make sure that JMeter has enough headroom to operate and increasing metrics sending rate doesn't affect the overall throughput.
I am using Jmeter for performan testing, I believe elapsed time is the response time which I am considering(i.e.,85 milliseconds). When I hit the same request from postman It is taking very less time(i.e.,35 milliseconds) so I want to know where my JMETER giving correct results or not
Elapsed time consists of:
Connect time (it might include SSL handshake)
Latency
Application response time
Given you're running the same request (URL, body, headers) from the same machine you should have similar results.
Try running the request for more times, i.e. 10 or 100 using newman and JMeter (set number of iterations in Thread Group to 100). If you will still be seeing differences - consider comparing the requests using an external sniffer tool like Wireshark, it will give you more insights regarding what's going on under the hood.
I have observed difference between JMeter - HTML Dashboard Report(Response Times Over Time) and Response Times Over Time Listener.
I am using JMeter version 3.3
HTML Dashboard Report shows Peak value of Response time = 28455 ms # 11:33:00 whereas Response Times Over Time Listener shows peak value of Response time = 45803.6 ms # 00:00:52.
Both the HTML report and Listener are generated using same result.csv file.
Can anyone please help me understand this. Please correct me if I am understanding this incorrectly.
It is impossible to say what is the cause without seeing the configuration of the Response Times Over Time listener and HTML Reporting Dashboard.
Most likely your dashboard is configured in the way that it "masks" this spike due to high granularity compared with relatively low test duration (1.5 minutes)
One more place where the differences could be is "Type of Graph" setting of the Response Times Over Time
Similarly configured graphs generation should produce similar graphs on the same data (unless there is a bug)
And finally make sure that you use:
Latest version of the Response Times over Time plugin (you can check for/install updates using JMeter Plugins Manager)
Latest version of JMeter (JMeter 4.0 as of now)
Suppose, I am adding some think time(Timers) in each HTTP request, but when I execute the test, in the report it shows response time as Sum of ThinkTime + actual response time.
How can I get actual response time from the result?
by default, JMeter does not include Timer's time in the response time of any HTTP sampler.
In case if you are using Transaction Controller to group the requests, then you can deselect the checkbox Include duration of timer and pre-post processors in generated sample in the transaction controller.
By default JMeter does not include the duration of:
Timers
PreProcessors
PostProcessors
into Sampler's response time unless you use Transaction Controller with Include duration of timer and pre-post processors in generated sample option selected. If this is the case and you use dynamic values in the Timer - you can consider using Sample Variables functionality to record think time into .jtl results file.
Think Time is the time taken by the user to read,
understand and take next action on the webpage.
So the time between a response and the net request
is the Think Time. This can be simulated by adding
a timer.
How do i get the load time of my test from jmeter into my influxdb. I am able to see data in influxdb that has been added from jmeter but how do i see the "load time" for my test case. The thing is if i run my test case 20 times, as number of threads:20, in influxdb 20 are divided based on number of threads per second, how can i change that. I want to see my load time for each test case in Influxdb-Grafana.
In Jmeter just add a Summary Report to the existing Recording Controller. Then run the testcase. You'll see a row for each request and there would be a lot of information about the test including response time (Average, Min and Max)