If unchecked which is default, plugin will not use instance weight information to scale number of executors per node, and just set number of executors defined in configuration field Number of Executors

Note Auto Scaling Groups don't support weights, only EC2 Spot Fleet.

When it's checked, plugin consumes instance weight information provided by Launch Specification and uses it to scale node number of executors from configuration field Number of Executors Note current implementation doesn't support Launch Template only Launch Specification

Example (here instance type from launch specification match with launched instance type):
Number of Executors Instance Weight Effective
Number of Executors
1 1 1
1 0.5 1
1 0.1 1
10 0.1 1
1 1.5 2
1 1.44 1

Plugin always set number of executors at least one. If launched instance type doesn't match any weight in launch specification regular number of executors will be used without any scale.