I'm setting up a Jmeter performance test case and in the debugging phase I need to log the full HTTP headers.
I have created my jmx script for a test.
I can't find anywhere how to tell Jmeter to log that to the ouput in jmeter/log.
Is it possible and how ?
In the JMeter workflow, it is usually the easiest to use the GUI to create and debug your test. The View Results Tree listener shows a tree of all your requests and responses, including header information. It should be mentioned, even though it is called out in a red box at that link, do NOT use the view results tree listener during a load test, it is a very expensive component that drains memory and CPU.
To debug from the command line, the save responses to a file listener is the usual go-to to save response data to disk, but I'm not certain it saves headers. The Simple Data Writer listener though does both Request and Response Headers via the configure panel.
Again, care should be taken to not leave in excessive logging for a full load test, your disk I/O could become a bottleneck.
And last, as with most things JMeter, you can replicate any behavior in a beanshell component. Either a post processor or an assertion.
if (someCondition) {
log.info(ResponseHeaders);
}
Related
I'm currently testing a 1.5GB download. Does the Save Responses to a File storing the data in the cache first when the request is not yet done? Is it possible to configure the JMeter to write the file while receiving the data?
As of JMeter 5.4.3 the Save Responses to a File listener:
Waits for the full response to arrive to JMeter
Writes it using BufferedOutpuStream via JOrphanUtils.write() function
It's not possible to easily amend this behaviour unless you're willing to write a custom plugin for JMeter
I can suggest a better option: instead of saving the whole file you could:
Tick Save response as MD5 hash? box under "Advanced" tab of the HTTP Request sampler
The downloaded file integrity can be checked using MD5Hex Assertion
The point is that same files have the same MD5 checksum, if the downloaded file's checksum will be different - it means that the file content differs and MD5Hex Assertion will fail the associated Sampler.
As a bonus, this trick will greatly reduce JMeter's memory consumption and you will be able to conduct higher load from the same machine.
More information on JMeter Assertions concept: How to Use JMeter Assertions in Three Easy Steps
I am trying to make a request where it returns very big data. When I make a request from Katalon Studio or JMeter, it gives me a response after 7-8 seconds. But from swagger when I try to make same request as I did from katalon studio it needs 2-3 minutes to give me the data and also if it needs more than 2-3 minutes, page dies.
Can you help me understanding, why I get response from swagger so slow and from Katalon so fast? I think the problem is in showing the big information ?
In JMeter data is not shown fully.
I can provide everything what is needed.
This is the data from JMeter.
With regards to "swagger so slow" - most probably it's your browser issue, it might fail to render big amounts of data. Consider using a command-line tool like Curl which can output the response as plain text or save it into a file
With regards to JMeter data is not shown fully, by default JMeter limits the data coming from the server to save memory to 10 megabytes, it's controllable via the view.results.tree.max_size property. If you want to see the full response data in the View Results Tree listener - add the next line to user.properties file:
view.results.tree.max_size=0
or provide the above parameter via -J command-line argument like:
jmeter -Jview.results.tree.max_size=0 -t test.jmx ....
see Apache JMeter Properties Customization Guide for more information on JMeter properties and ways of setting/overriding them.
You can also consider using Save Responses to a file listener to store the response to a file of your choice.
I have been using Jmeter for performance testing my web application. I have recorded the jmeter script by excluding js,css and other static content files.
While running the script, Jmeter doesnt execute javascript files so ajax XHR request are not sent. To overcome this i have recorded the script with js, css and other static content and it recorded all the Ajax xhr request too. But the performance results seems to be different from the browser loading time. Also i need to use cache during my performance testing.
Below is how my test plan will look like,
Included Retrieve all embedded resources in HTTP Request manager.
Concurrent pool size is 6
I have added HTTP cookie manager and Cache manager.
I have added a loop controller (This is for caching, jmeter will cache the files on first iteration and it will use the cached files
after that)
The problem i am facing is that the time taken for rest call are double the time shown in the browser console for single user. I have tried all other combinations but always i am getting higher time than the browser console.
I have tried to use the Selenium webdriver plugin to simulate the browser behavior but it doesnt seems to be using the cache. (https://www.blazemeter.com/blog/how-load-test-ajaxxhr-enabled-sites-jmeter)
Is there any other way to solve this problem? I want to take the metrics with cache so kindly suggest me any solution that must include cache. Or is there any other tool similar to jmeter that could solve this issue. My goal is to take web page load time with cache for 'n' number of users.
PS : I am even interested to write any scripts in jmeter but the scripts should not overload the performance of jmeter.
Thanks in advance.
You should not be recording calls to embedded resources (images, scripts, styles, fonts, etc.) as if you record them - they will be executed sequentially while real browsers do this in parallel. So remove recorded requests for the embedded resources and "tell" JMeter to download them (and do it in parallel) using HTTP Request Defaults
You should be recording AJAX requests, however real browsers execute them in parallel while JMeter runs them sequentially. In order to make JMeter's behavior closer to real browser you need to put these AJAX calls under the Parallel Controller
You can install the Parallel Controller extension using JMeter Plugins Manager
Jmeter and caching are unrelated - everything that happens after data went over the wire is out of scope by design. You should only ever simulate requests that you expect NOT to be cached. So this is the feasible part: drop all requests that you expect the browser to cache from the Jmeter script (or move them outside the loop). On the load time of XHR: the browser will most certainly use HTTP keepAlive. Result is that all requests except the very first skip the setup and teardown phase of TCP sockets and are much faster - esp. when the request itself is small and quick. You can simulate this in JMeter also by checking the KeepAlive option AND selecting http commons as implementation. You can read up on this in the docs here: http://jmeter.apache.org/usermanual/component_reference.html#HTTP_Request
There is Jmeter response time difference between Jmeter run results and manually captured the response time from the local system using stop watch on the web application.
Browse the web app from local windows system and use stop watch to see the response time to load the page.
Run the Jmeter in non-gui/gui mode and observe the response time (used Listeners only to debug, when run the script no listener was added)
Can see there is a difference in both. Please suggest how to know if Jmeter has captured the correct response time.
Given you properly configure JMeter you should get the same or similar response time for the same request. "Proper" configuration stands for:
You should configure JMeter to retrieve embedded resources and use parallel thread pool of ~5 threads for this
This options "tells" JMeter to fetch images, styles and scripts referenced in the main HTML page and do it in parallel like real browsers do
Add HTTP Cache Manager to your Test Plan. Real browsers download embedded resources but do it only once, on subsequent requests the resources are being returned from disk cache, no actual request is being made. HTTP Cache Manager enables cache simulation and cache-control headers handling.
Add HTTP Cookie Manager to represent cookies/sessions and deal with cookie-based authentication
Add HTTP Header Manager to your test plan to represent browser headers. It might be important as i.e. missing Accept-Encoding header may disable server-side compression therefore client will receive much more data and it will take more time.
Assuming "good" JMeter configuration you should see more or less same behavior
If there are still differences - capture the requests sent by JMeter and the browser using a sniffer tool like Wireshark and amend JMeter configuration to eliminate the differences
JMeter have three basic measurements it captures per request:
Elapsed Time (which is overall timespan from the point when it just starts sending request to the last bit received)
Latency (which starts the same point in time and ends when server starts responding)
And Connect time (which is included in latency and is basically the time for handshakes with server, including SSL/TLS negotiations)
So if you set a data writer among your listeners (e.g SimpleDataWriter, although AggregateReport & SummaryReport can do it as well), you'll see these metrics in your data file (while standard listeners/visualisers/aggregators stuck to elapsed time only).
But mind that these metrics doesn't include response rendering, and especially any code to be executed by browser.
JMeter just doesn't do it at all: obviously, it measures just the combined performance of Server + Network, skipping everything on the client side (except for bare necessities, like protocol negotiations).
That might explain the difference you've experienced.
As well as the difference between logged server processing times & the response times measured by JMeter: server just doesn't count what the network brings in.
PS And you don't have to sit and click on stopwatch with your browser: modern ones have a Dev Tools capable of showing you the precision timings divided by stages. E.g., just call Ctrl+Shift+I in Chrome, switch to network tab & behold the timings right there as you doing your requests.
When I have given 500 concurrent users load via jmeter my server throwing error message but the same time I have called same request via browser showing proper response. How it is possible? Is there any settings in jmeter for avoiding same.
It is hard to say what can go wrong without seeing your JMeter configuration, full server response, JMeter and application under test logs and network dump for browser and JMeter.
The whole idea of performance testing is mimicking real user as close as possible, so you need at least
Add HTTP Request Defaults and set JMeter to:
Download embedded resources
Use concurrent pool of 2-5 threads
Add HTTP Cookie Manager
Add HTTP Cache Manager
Add HTTP Header Manager
Correlate any dynamic parameters
Simulate any specific application behaviour (i.e. AJAX calls)
etc.
In addition to above recommendations: ideally given "good" JMeter you shouldn't see any "response messages", you should see a number of errors in final report so double check you:
Run JMeter in non-GUI mode
Storing only those metrics which are absolutely required
Follow other recommendations from 9 Easy Solutions for a JMeter Load Test “Out of Memory” Failure
beside, what Dmitri described above, I would also check the actual throughput the server returns in either cases.
Throughput depends a lot on the timers you configured in Jmeter to simulate think time.
Jmeter has no rendering and no javascript engine, so each thread is much much faster than a real browser.