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Fluid Software : Handling Heterogeneous Many-Core for Programmer Productivity

Fluid Software : Handling Heterogeneous Many-Core for Programmer Productivity. Nate Clark. Heterogeneous Many-Core. Need more performance, have many transitors Power limited → Efficiency in designs Domain-specific design/many simpler cores. The Biggest Problem: Software.

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Fluid Software : Handling Heterogeneous Many-Core for Programmer Productivity

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  1. Fluid Software: Handling Heterogeneous Many-Core for Programmer Productivity Nate Clark

  2. Heterogeneous Many-Core • Need more performance, have many transitors • Power limited → Efficiency in designs • Domain-specific design/many simpler cores

  3. The Biggest Problem: Software • Parallel programming is hard • Heterogeneous programming is hard • Forward compatibility • Legacy applications I am a frustrated programmer

  4. What Do We Want: Fluid Software • Program adjusts to whatever system has • Many-core/accelerators/whatever • Automatic, works on legacy code *.c Compiler *.exe Runtime Optimizer

  5. What Does This RTO Need to Do? • Task Decomposition • Break application into parallelizable pieces • Task Mapping • Place them on a processor/accelerator • Task Management • Evaluate solution and dynamically adjust

  6. Task Decomposition • Didn’t this fail in the 80’s? • Hard for programmer to reason about programs • Impossible for compiler • Dynamic behavior easily predictable • Find probable data/pipeline parallelism *.exe

  7. Saturate IDCT conv420 to422 conv422 to424 Decode Block predict and add block store ppm MPEG2 Decode • Example dynamically discovered task graph Thies et al. 2007

  8. Saturate IDCT conv420 to422 conv422 to424 Decode Block predict and add block store ppm Task Mapping • Place each task on best processor • Predict most effective processor • Generate code (runtime/quality tradeoff) • Forward compatible CPU GPU FPGA

  9. Saturate IDCT conv420 to422 conv422 to424 Decode Block predict and add block store ppm Task Management • Monitor and refine task mapping • What to do when new tasks appear • Understand what’s going on • Scalable control algorithm • Architectural support to help monitoring

  10. B C A D CPU GPU FPGA Fluid Software System *.exe Decompose Task Manager Task Mapper

  11. Fluid Software Summary • RTO adjusts software for any architecture • Task decomposition • Task mapping • Task management • Provide feedback to help programmers write better code I’m a happy programmer

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