Table Of Content

Scheduling Multicore Digital Signal Processing Maxime Pelcat 2014 Slides from M. Pelcat, K. Desnos, J-F. Nezan, D. Ménard, M. Raulet, J Gorin 2 Introduction: Porting Algorithms to Multicore DSPs Maxime Pelcat – [email protected] - June 2013 3 Typical Code Development Environment Algorithm Code Compiler Program Command Line Options Simulator OS + Debugger Core (s) + Profiler Multicore DSP 4 Possible MPSoC Dataflow-based Development Environment Functional Algorithm Model + Code Program Program Program Program Compiler Deployment Constraints + Options Simulator … OS OS + Debugger Architecture Core 1 Core 2 … + Profiler Model Multicore DSP 5 Addressed Problem • Distributed embedded systems are harder and harder to program • Difficult Constraints High computation requirements Low power consumption Many hardware and software choices: lack of information/metrics Real-time constraints (hard of soft real-time) Need to reuse legacy code • Difficult Goals Design both hardware and software Balance loads Obtain the most from a given architecture Respect constraints Maxime Pelcat – [email protected] - June 2013 6 Addressed Problem • Traditional code in C abstracts core architecture Amount of registers Number of pipeline stages Instruction parallelism Loop optimizations Cache accesses Data representation … • C code can not be efficiently transformed into coarse grain parallel code Assumed global state in a program Unique activity point Inspired by the Turing machine • The solution may come from dataflow MoCs Maxime Pelcat – [email protected] - June 2013 7 Grail of Multi-core DSP Programming Algorithm High Level Multi-core Multi-core Description Compiler Program Architecture High Level Description Multi-core Runtime Simulator + Debugger ARM ARM Co-processor Co-processor + Profiler ARM ARM DSP DSP DSP DSP DSP DSP DSP DSP Multicore DSP 8 Code Porting Multi-core code porting  assignment, ordering and timing Task 2 Task 1 Task 4 Task 3 Core 1 Core 2 Multicore DSP 9 Code Porting Task 2 Task 1 Assignment Task 4 Task 3 Core 1 Core 2 Task 4 Task 1 Task 2 Task 3 Multicore DSP 10 Code Porting Task 2 Task 1 Ordering Task 4 Task 3 Core 1 Core 2 Task 1 Task 4 Task 2 Task 3 t t Multicore DSP

ARM Co-processor ARM ARM DSP DSP DSP DSP DSP DSP DSP DSP Co-processor PDF

181 Pages·2014·6.7 MB·English

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Publication Year:	2014
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Language:	English
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