What is the highest number of threads that is reasonable to simultaneously run in Jmeter?

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JMeter can simulate a very High Load provided you use it right.

Don’t listen to Urban Legends that say JMeter cannot handle high load.

Now as for answer, it depends on:

  • your machine power

  • your jvm 32 bits or 64 bits

  • your jvm allocated memory -Xmx

  • your test plan ( lot of beanshell, post processor, xpath … Means lots of cpu)

  • your os configuration (tunable)

  • Gui / non gui mode

So there is no theorical answer but following Best Practices will ensure JMeter performs well.

Note that with jmeter you can distribute load through remote testing, read:

And finally use cloud based testing if it’s not enough.

Read this for tuning tips:

Read this book for doing load testing and using JMeter correctly.

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