Ichthyostega
54e489b9b6
This statistical criterion defines when to count observed Scheduler performance as loosing control. The test is comprised of three observations, which all must be confirmed: - an individual run counts as accidentally failed when the execution slips away by more than 2ms with respect to the defined overall schedule. When more than 55% of all observed runs are considered as failed, the first condition is met - moreover, the observed standard derivation must also surpass the same limit of > 2ms, which indicates that the Scheduling mechanism is under substantial strain (on average, the slip is ~ 200µs) - the third condition is that the ''averaged delta'' has surpassed 4ms, which is 2 times the basic failure indicator. These conditions are based on watching the Scheduler in operation; typically all three conditions slip away by large margin after a very narrow yet critical increase in the stress level. Using three conditions together should improve robustness; often the problems to keep up with the schedule build up over some parameter range, yet the actual decision should be based on complete loss of control. |
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