In the settings you can set the PARALLEL processes. This sets the maximum amount of processes in your database.
A higher number generally increases performance but can also give a higher load on your database.
In some circumstances you might want to lower or to raise this setting.
The question is: Does Subset or Privacy recognize this at running
The answer is "yes" . Subset and Privacy do check for this value during every setp in the process.
Running processes will continue, but new processes will follow the new setting. So if the setting is 8 and you lower the number then the current (max) 8 processes will still continue.