How to prevent Jmeter5.5 from stopping internet?

Question

I am doing some benchmark testing. During this, I have to increase numbers of users 3000, keeping ramp-up time 100 and loop count 1. Somehow jmeter giving the below errors:

Response code: Non HTTP response code: org.apache.http.conn.HttpHostConnectException

Response message: Non HTTP response message: Connection to https://the-homepage-I-am-testing.net refused

Answer 1

1. There is no such thing as "JMeter5.5" yet, the latest version as of now is JMeter 5.1

2. Looking into error details it looks like a bottleneck on the application under test side so you need to inspect what's causing these connections refusals:

   • inspect your application logs for any suspicious entries, it might be a matter of a thread pool maximum setting which is not sufficient
   • inspect your application server / database configuration as it might be the case you have the above limitation on the middleware level
   • inspect OS configuration for the same as it might be the case there is not enough maximum open handles so OS cannot allocate a socket to serve the connection
   • make sure to monitor baseline health metrics, application under test should have enough headroom to operate in terms of CPU, RAM, etc. - you can use JMeter PerfMon Plugin for this

3. Looking into your configuration it doesn't necessarily assume 3000 concurrent users as you have only 1 iteration. Given 100 seconds ramp-up it might be the case that some users have already finished test execution and some had not been yet started. Double check you're really deliver the anticipated load using i.e. Active Threads Over Time listener.