CISC360 Lecture Notes - Lecture 4: Magnetic Storage, Microarchitecture, Integrated Circuit
13 Sep 2016
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Registers, memory addressing, addressing modes, instruction operands, available operations, control flow instructions, instruction encoding. Magnetic disk technology, density since 2004 dropped to: 40%/year. Latency (execution time): time to finish a fixed task. Throughput (bandwidth): number of tasks in fixed time. What is the fastest way to send 10tb of data? (10^12) bits) Car: capacity = 5, speed = 60 mph. Bus: capacity = 60, speed = 20 mph. Time between start an completion of an event. Nvlink much more energy efficient than traditional pci-e. Analogy: expanding the roads from 4 lanes to 20. Pay for power twice: once in, once out (to cool) No room for a fan in a cell phone, no market for a hot cell phone. Computers account for growing fraction of energy consumption. Clock rate can be reduced dramatically to limit power consumption. Used as a target for power supply and cooling system. Lower than peak power, higher than average power consumption.
