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Experiment 17: Tile Size Sweep

1. Focus

  • Tune the tile shape used by the shared-memory stencil path.

2. Question

  • Which tile size gives the best tradeoff between reuse, occupancy, and local-memory overhead?

3. Variants

  • shared_tiled with several tile sizes
  • direct_global reference

4. Method

  • Reuse the tiled stencil workload from Experiment 16 and sweep tile size only.
  • Hold the stencil radius, output semantics, and timing path fixed across the sweep.

5. Outputs

  • Median GPU time by tile size.
  • Best tile-size recommendation.
  • Speedup relative to the direct-global reference.

6. Interpretation

  • Tile size is a tuning parameter, not a universal constant.
  • The winning point should be treated as hardware- and workload-specific evidence.