Configure the JMeter setUp Thread Group miscellaneous features: properties, defaults, and practical usage notes for building reliable load tests.
Part of the Miscellaneous Features category. Also documented in context in the full Component Reference.

A special type of ThreadGroup that can be utilized to perform Pre-Test Actions. The behavior of these threads is exactly like a normal Thread Group element. The difference is that these type of threads execute before the test proceeds to the executing of regular Thread Groups.