Updating U, P
P(r ) is the percentage of CPU time executing task r or
= CPU time (r )/ ? CPU time by all requester
Updated based on sliding window scheme but not a discounted scheme as used for U.
- Incase of IO bound bursty requests, TBR will show on high utilization but can not capture the running time requirements
- Sliding window is used to compute CPU time distributed among processes. But the window time should be such that it samples all processes (long) and also reflect the workload variation (short).