Issue
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I’d like to understand what is a Jenkins® executor, and how to best manage executors?
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How many executors should I allocate to the controller or operations center, and on build agents?
Resolution
A Jenkins executor is how you can configure how many concurrent builds run on any particular build agent. Please see Jenkins Terminology for more details regarding executors, nodes/agents, as well as other foundational pieces of Jenkins.
How many executors should I allocate to the controller or operations center, and on build agents?
This is covered in the Remoting Best Practices page, under Number of executors.