In my JMX file, I am using WebSocket single reader sampler and running the no of users as 2450 with ramp-up time is 150 sec. But after a few minutes, I am getting the below error.
WebSocket Single Read Sampler, Sampler error, "Sampler configured for using the existing connection, but there is no connection", Thread Group 1-18
It might be the case your application gets overloaded and cannot setup the connection within the bounds of 20 seconds default timeout therefore WebSocket Open Connection fails and hence when WebSocket Single Read Sampler is being executed there is no connection to "read" from and it fails as well.
If you want to avoid this type of errors the options are in:
Choose different behaviour on Sampler error under Thread Group:
Put your WebSocket Single Read Sampler under the If Controller and click "Use status of last sample" button, this way all the If Controller's children will be executed only if open connection sampler will be successful:
Related
How to use existing websocket connection to another websocket request in jmeter?
When I tried to use existing connect then as result it show me an error "Sampler configured for using existing connection, but there is no connection" . Please refer attached screenshot.
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It looks like you're using 2 different WebSocket Samplers implementations:
JMeter-WebSocketSampler
and JMeter WebSocket Samplers
Your WebSocket Single Write Sampler:
Doesn't know anything about the connection established by the WebSocket Sampler
The WebSocket Sampler closes the connection after receiving the response
So if you want to continue with the WebSocket Single Write Sampler you need to:
Use WebSocket Open Connection sampler to establish the connection:
In the WebSocket Single Write Sampler tick use existing connection box
More information: JMeter WebSocket Samplers - A Practical Guide
If you want to continue with the WebSocket Sampler - tick Streaming connection box:
and remove the WebSocket Single Write Sampler and friends from the Test Plan
I just have a load test in JMeter, in the test, the client will send several requests in few seconds. But I find a problem when the client makes a new request, the JMeter will close the former connection and create a new connection, I just want to reuse the former connection to send a request to the WebSocket server.enter image description here
Just tick use existing connection box in your WebSocket Samplers and the connection established by the WebSocket Open Connection sampler will be re-used
I believe the connection doesn't survive Thread Group iterations (it's basically re-established when Open Connection sampler is executed 2nd time, if you need to repeat the request more than once - either go for Loop Controller or put the Open Connection sampler under the Once Only Controller
More information: JMeter WebSocket Samplers - A Practical Guide
I am using JMeter to test our websockets server API and now I have the following issue. I need to open and keep multiple WS at the same time to be able to use them in parallel.
JMeter WebSocket Samplers plugin provides possibility:
To open a WebSocket connection via WebSocket Open Connection sampler
And then you can re-use the connection in the following Samplers which will be doing the real work: read, write
When you don't need the connection anymore you can use WebSocket Close sampler
The connections are established "per thread" (virtual user) so provide necessary amount of concurrent threads in the Thread Group and make sure to specify enough loops or the desired duration of the test
More information: JMeter WebSocket Samplers - A Practical Guide
I'm doing load testing using JMeter for my gaming application.
First I log in my application by HTTP request and then enter into the game(it is a WebSocket connection).
I successfully hit Websocket and able to send the request and receive a response.
Iam using WebSocket Samplers by Peter Doornbosch.WebSocket request-response Sampler captures one response at a time.
But in my application for a single request five JSON response is returned by the server. I need to capture those five responses. so I used WebSocket read sampler.
If I hit that WebSocket by increasing thread count most of the test cases are failed because of timer issue.
Jmeter sends the next request without waiting for previous reponse.
In my application, if one game ends, then the response is sent by the server. After receiving that only next game request must hit.
But the next game request hit the server before the current game ends. can please help me to sort this issue????
Put your WebSocket read sampler under the While Controller and specify the condition for exiting the while loop (it might be something coming from the JSON Extractor)
Jmeter sends the next request without waiting for previous reponse.
this statement is not true, each thread (virtual user) waits for the current sampler to finish before starting the next sampler
We are planning to do load testing of our server and we need to generate heavy load from Jmeter tool. But as per i know, jmeter waits for the response to create another request thread. Is there a way to create http request without waiting for response from the server using jmeter? if not, what are the available work around to generate heavy load keeping number of threads fixed?
Define a very small timeout in the HTTP Request sampler (or even better in HTTP Request Defaults so the setting would be applied to all HTTP Request samplers) like 1 millisecond so JMeter will close the connection right after sending the request
(Optional) To avoid JMeter marking requests as failed add Response Assertion and tick Ignore Status box
You can set in HTTP Request in the Advanced tab Timeout of Connect and Response with 1 ms
Connect Timeout Connection Timeout. Number of milliseconds to wait for a connection to open.
Response Timeout Response Timeout. Number of milliseconds to wait for a response. Note that this applies to each wait for a response.
If you need to return always success you can add with JSR223 PostProcessor and use prev variable:
prev.setSuccessful(true)