Hi, Please note that the concept of virtual users is very tricky in JMeter. Especialy for people that worked with other types of performance tools previously.
JMeter has threads of execution and their behaviour differs accordingly to whatever you want your script to do (but they are java threads and behave just like in any other java application). How sockets are opened differs a lot too (your question is very general and I think it depends more on the JVM and hte OS rather then jmeter itself). From monitoring the OS, on very busy tests (where threads make 5-10 requests per second), each thread uses 1 socket. But, depending on your OS and other configurations, sockets may be left opened for a while after one thread ended a loop. So by having many threads or many loops per thread you might run into trouble. If you are having exceptions on the machine where you run jmeter (related to network, number of sockets), then you'll probably need to tweak the OS in order to make high loads with jmeter. Search in older threads, this was previously disscused. Adrian On Thu, Jul 5, 2012 at 1:44 PM, Prabhash Rajarathne <[email protected]>wrote: > Hi All, > I want to know how does JMeter Virtual Users created. When simulating 40 > users does JMeter open up 40 sockets and create the load or does all http > request / responses go back and forth from a single socket or port with > multiple treads(sessions)? please explain > > Regards, > Prabhash >
