Static robustness and mean response time of multi-threshold allocation policies

The tradeoff between the low mean response time of the T1 policy and good static robustness of the T2 policy motivates us to introduce multi-threshold allocation policies: T1T2 and ADT policies. The T1T2 policy places a threshold on each queue, while the ADT policy places two thresholds on queue 1 as well as a threshold on queue 2. We will study how the mean response time and static robustness of these multi-threshold allocation policies compare to that of the single-threshold allocation policies.