Stepping Thread Group
This plugin is deprecated and should not be used. Use Concurrency Thread Group instead.
JMeter have only one out-of-the-box option for threads (users) scheduling: simple ramp-up. But many users, especially with HP LoadRunner experience miss more flexible thread scheduling algorythm. Stepping Thread Group adds to JMeter thread scheduling similar to LoadRunner's.
In JMeter version 2.4 new plugin type was introduced: custom Thread Groups. Stepping Thread Group is the first custom thread group in the world.
However, time goes by and probably better alternative has been offered: Concurrency Thread Group
Following screenshot shows Stepping Thread Group set to generate load increasing by 10 users each 2 minutes:
Actual test run shows following activity graph: