An image forming apparatus includes an image forming mechanism, a fixing roller, a heater, a sensor, a warm-up mechanism, and a controller. In an embodiment, occurrence of a speculative code debug event is detected and a speculative code execution debug module is executed in response to occurrence of the event. Only a portion of all cache entries are selected to be migrated and the portion is selected from cache entries with the first indicator set to indicate long-term utility. A clinician may receive the key notification regardless of the view or application in which the clinician is working.