NDLI: LEO: scheduling sensor inference algorithms across heterogeneous mobile processors and network resources

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LEO: scheduling sensor inference algorithms across heterogeneous mobile processors and network resources

Content Provider	ACM Digital Library
Author	Lane, Nicholas D. Mascolo, Cecilia Georgiev, Petko Rachuri, Kiran K.
Abstract	Mobile apps that use sensors to monitor user behavior often employ resource heavy inference algorithms that make computational offloading a common practice. However, existing schedulers/offloaders typically emphasize one primary offloading aspect without fully exploring complementary goals (e.g., heterogeneous resource management with only partial visibility into underlying algorithms, or concurrent sensor app execution on a single resource) and as a result, may overlook performance benefits pertinent to sensor processing. We bring together key ideas scattered in existing offloading solutions to build LEO -- a scheduler designed to maximize the performance for the unique workload of continuous and intermittent mobile sensor apps without changing their inference accuracy. LEO makes use of domain specific signal processing knowledge to smartly distribute the sensor processing tasks across the broader range of heterogeneous computational resources of high-end phones (CPU, co-processor, GPU and the cloud). To exploit short-lived, but substantial optimization opportunities, and remain responsive to the needs of near real-time apps such as voice-based natural user interfaces, LEO runs as a service on a low-power co-processor unit (LPU) to perform both frequent and joint schedule optimization for concurrent pipelines. Depending on the workload and network conditions, LEO is between 1.6 and 3 times more energy efficient than conventional cloud offloading with CPU-bound sensor sampling. In addition, even if a general-purpose scheduler is optimized directly to leverage an LPU, we find LEO still uses only a fraction (< 1/7) of the energy overhead for scheduling and is up to 19% more energy efficient for medium to heavy workloads.
Starting Page	320
Ending Page	333
Page Count	14
File Format	PDF EPUB
ISBN	9781450342261
DOI	10.1145/2973750.2973777
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2016-10-03
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Dsp Mobile sensing Scheduling Offloading
Content Type	Text
Resource Type	Article

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