Summary of scheduling behavior

The following table summarizes how the thread scheduler divides time in normal and freetime-by-ratio mode:

Partition state	Normal	Freetime-by-ratio
Usage < budget	By priority	By priority
Usage > budget and there's free time	By priority	By ratio of budgets
Full load	By ratio of budgets	By ratio of budgets
Partitions running a critical thread at any load	By priority	By priority

Note: The scheduler's overhead doesn't increase with the number of threads; but, it may increase with the number of partitions, so you should use as few partitions as possible.