27 February - 1 March 2018 // Nuremberg, Germany

Conferences and supporting programme

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Session 16 - Power Supply Design and Management

Understanding Where the Power Goes in an Energy Efficient Systems Vortragssprache Englisch

The “traditional” way of measuring the efficiency of a system is to measure the overall system power while running a series of synthetic benchmarks and see which scores the highest, while minimizing power consumption or simply running use cases and measure the battery drain. Of course, the entire system including the SoC, the memory, the Wi-Fi chip set, the LCD etc. all contribute to the drain on the battery. Measuring the power at the battery level will certainly provide data on how the entire system is performing but will not give the granularity required to really understand where the power is going during the task. This paper will discuss techniques and procedures used to allow systems to be measured down to a SoC level leading to a much deeper understanding of the system’s overall efficiency. It will also compare the differences in CPU activity and usage between synthetic benchmarks and traditional everyday use cases. The presentation will be split into a number of distinct sections. Section 1 – Overview – Looking at different ways the power/performance and efficiency of systems can be compared. Comparing and contrasting energy and power. Section 2 – The practicalities of measurements – a detailed look at how the power rails inside a system can be accessed and measured. A look at some of the equipment needed and the procedures used. Section 3 – Results – a look at some of the real like results that have been measured. Section 4 – Benchmarks vs Real Life – A look at some of the differences between the behavior of synthetic benchmarks and use cases. Both on the usage of the CPUs and GPUs as well as the power consumption and efficiency. Section 5 – IoT – A look at some of the unique problems associated with measuring the lower power consumption of IoT devices. Section 6 – System Benefits – A look at some of the “secondary” benefits that can be achieved from an efficient system. Section 7 – Summary of the presentation

--- Date: 28.02.2018 Time: 5:00 PM - 5:30 PM Location: Conference Counter NCC Ost

Speakers

man

Rod Watt

/ arm Limited

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