Processor utilization
Also: CPU utilization
The fraction of available processor time demanded by work.
For periodic tasks, nominal utilization sums execution time divided by period, but schedulability also depends on deadlines, blocking, and priority.
- Units
- dimensionless or percent
- Formula
U = Σ(Cᵢ/Tᵢ)
Example 2 ms of work every 10 ms uses 20% nominal utilization.
Common misconception Average utilization below 100% does not guarantee every deadline is met.