Suppose there is a mobile application that can run in two mo…
Suppose there is a mobile application that can run in two modes: Lazy or Eager. In Lazy Mode, the execution time is 4.267 seconds. In Eager Mode, the app utilizes a faster time resolution for its computations, so the execution time in Eager Mode is 3.414 seconds (i.e., Eager Mode execution time is 75% of Lazy Mode execution time) After finishing computation, the app sends some data to the cloud, regardless of the mode it’s in. The data size sent to the cloud is 100 MB. The bandwidth of communication is 25 MBps for WiFi and 16 MBps for 4G. Assume that the communication radio is idle during the computation time. Assume that the communication radio for WiFi has a power consumption of 80 mW when active and 10 mW when idle. Similarly, assume that the communication radio for 4G has a power consumption of 120 mW when active and 12 mW when idle. The Idle Power of the CPU is 1 mW, whereas the Active Power of the CPU is 1.5 mW per unit utilization. Assume that the power consumption of the CPU is a linear function of its utilization. In other words: P = (Idle Power) + (Utilization)*(Power per unit Utilization). A configuration of the mobile app involves choosing a time resolution (Lazy or Eager) and choosing a type of radio (WiFi or 4G). For example, faster timer resolution (Eager) and 4G network is a configuration, while slower resolution (Lazy) and WiFi is another. There are four possible configurations in all. Which configuration has the highest maximum power consumption?
Read Details