Progress Report 2012/11/28.

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Presentation transcript:

Progress Report 2012/11/28

Computation Offloading Mobile devices have limited energy and computing resources. Offloading some workloads to remote servers leads to: Power-saving. Performance improving. Shorter execution time. Better results.

Computation Offloading(Cont.) Offloading granularity: Process level Process migration. Function/Method level Target Android apps. Activity + Service

Applicable Image processing Audio processing Text processing object recognition, OCR, face detection, barcode analysis Audio processing speech recognition Text processing machine translation Artiﬁcial intelligence for games Chess 3D rendering 3D home interior design Security taint analysis and virus scans

Related Works Cyber foraging Scavenger(‘09) CloneCloud(‘10) MAUI(’10) a pervasive computing technique where resource poor, mobile devices offload some of their heavy work to stronger surrogate machines in the vicinity. Several studies since ‘01. Scavenger(‘09) CloneCloud(‘10) MAUI(’10)

Related Works(Cont.) Most of the existing works focus more on power than performance. The most important element is the network speed, then the computation ability of server. Recent studies focus on “how to make offloading decisions”. Formulate into a 0-1 ILP problem.

Our Idea Instead of studying offloading policies, we aim at the effects caused by offloading. After offloading, a computation-intensive process becomes I/O-intensive. Does this phenomenon affects scheduler? Does this phenomenon affects DVFS? Does this phenomenon affects cache/memory? …etc.

Our Idea(Cont.) Identify the influence of property change. Computation-intensive => I/O-intensive. Understand Android's strategies for thread scheduling, thread allocation, thread migration, DVFS, and DPM.

Thread Scheduler Completely Fair Scheduler(CFS) Since Linux 2.6.23 /kernel/sched.c Maintain balance (fairness) in providing processor time to tasks. Brain Fuck Scheduler(BFS) …still studying.

Cuckoo A framework that helps developers to offload computation to the server. Offloading decisions are made by Cuckoo framework. Offload if the remote resource is reachable.