A small controller was watched for nine cycles. At each cycle the load on the system was measured, and it was noted whether the controller acted. The table is the complete public trace.
| cycle | load | action |
|---|---|---|
| 1 | 0.42 | no |
| 2 | 0.55 | no |
| 3 | 0.88 | yes |
| 4 | 0.38 | no |
| 5 | 0.64 | no |
| 6 | 0.9* | yes |
| 7 | 0.51 | no |
| 8 | 0.62 | no |
| 9 | 0.87 | yes |
* Cycle 6 is published rounded. An exact measurement exists in the lab record but is not printed on this page.
A scheduled process runs every third cycle and is known to raise load while it runs. In these nine observations, therefore, periodicity and high load are coupled: either a periodic trigger or a load threshold is a natural explanation of the observed actions.
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