Abstract: A replicated state machine includes multiple state machine replicas. In response to a request from a client, the state machine replicas can execute a service for the request in parallel. Each of the state machine replicas is provided with a request manager instance. The request manager instance includes a distributed consensus means and a selection means. The distributed consensus means commits a stimulus sequence of requests to be processed by each of the state machine replicas. The selection means selects requests to be committed to the stimulus sequence. The selection is based on an estimated service time of the request from the client. The estimated service time of the request from the client is based on a history of service times from the client provided by a feedback from the state machine replicas. As such, requests from multiple clients are serviced fairly.

Abstract: A system, method and computer program for configuring power supply apparatus to supply a voltage optimized to tolerate a range about a nominal operating voltage of a device comprises a tester to test and communicate to a comparator a present utility voltage value. The comparator compares the present utility voltage with a present nominal operating voltage of the device. A configurator responds to the present utility voltage falling within an upper half of a first range having a centre point higher than the present nominal operating voltage and lower than an upper out-of-tolerance voltage of the device or within a lower half of a second range having a centre point lower than the present nominal operating voltage and higher than a lower out-of-tolerance voltage of the device, by configuring the power supply apparatus to supply a voltage respectively within the first range or the second range.

Abstract: A system, method and computer program for configuring power supply apparatus to supply a voltage optimized to tolerate a range about a nominal operating voltage of a device comprises a tester to test and communicate to a comparator a present utility voltage value. The comparator compares the present utility voltage with a present nominal operating voltage of the device. A configurator responds to the present utility voltage falling within an upper half of a first range having a centre point higher than the present nominal operating voltage and lower than an upper out-of-tolerance voltage of the device or within a lower half of a second range having a centre point lower than the present nominal operating voltage and higher than a lower out-of-tolerance voltage of the device, by configuring the power supply apparatus to supply a voltage respectively within the first range or the second range.