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Objective

ECE408 / CS483 Applied Parallel Programming Lecture 24: Application Case Study – Electrostatic Potential Calculation Part 2. Objective. To learn how to apply parallel programming techniques to an application Thread coarsening for more work efficiency

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Objective

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Presentation Transcript

  1. ECE408 / CS483Applied Parallel ProgrammingLecture 24: Application Case Study – Electrostatic Potential CalculationPart 2

  2. Objective • To learn how to apply parallel programming techniques to an application • Thread coarsening for more work efficiency • Data structure padding for reduced divergence • Memory access locality and pre-computation techniques

  3. Outline of A Fast Sequential Code for all z { for all atoms {pre-compute dz2 } for all y { for all atoms {pre-compute dy2 (+ dz2) } for all x { for all atoms { compute contribution to current x,y,z point using pre-computed dy2 + dz2 } } } }

  4. More Thoughts on Fast Sequential Code • Need temporary arrays for pre-calculated dz2 and dy2 + dz2 values • So, why does this code has better cache behaior on CPUs?

  5. Reuse Distance Calculation for More Computation Efficiency

  6. Thread Coarsening

  7. A Compute Efficient Gather Kernel

  8. Thread Coarsening for More Computation Efficiency

  9. Performance Comparison

  10. More Work is Needed to Feed a GPU

  11. Any Questions?

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