Change the thread count of test plan in JMeter, at run time

Question

I want to change the number of threads for a JMeter test plan at runtime.

I have Googled my problem and found a proposed solution to use JMeter plugins. But in this

Answer 1

By enabling the BeanShell server you can vary properties at runtime. Just enable it and telnet on port 9001 (warning: not secure!) Based on a test I did, unfortnately, it appears that the thread count it's not applied at runtime. However you can still manipulate the load of the test by other means, for example apply a costant throughput timer parametrized with a property named "throughput" and vary it at runtime like this:

setprop("throughput","2000");

It's well explained in the guide.