Autotuning GPU Thread Block Sizes for Large-Scale Stencil Applications Using the OPS DSL
Large-scale structured-mesh stencil applications can run for hours or days on modern HPC GPU platforms, making launch-configuration choices important. OPS enables high-level stencil codes to target multiple GPU architectures, but its GPU backends rely on a default or user-selected global block/workgroup shape, even though different kernels, problem geometries, and architectures may favor different configurations. This paper presents a transparent per-kernel block/workgroup-shape autotuning extension for OPS. The extension explores valid block/workgroup shapes during execution, records the fastest configuration for each kernel, and enables precomputed replay of the selected configurations in subsequent runs. We evaluate the approach on structured-mesh proxy and academic research applications, covering 459 unique kernels across 3 NVIDIA and 2 AMD GPUs. The evaluation reports speedup distributions, representative wall-time summaries, timing variability, and input problem shape effects. Replaying the best per-kernel launch shapes improves 923 of 995 measured application/input/GPU cases over the default OPS shape. Depending on the GPU, the median speedup ranges from 1.02x to 1.18x, with individual configurations of LAPL2D, TTI3D, and OpenSBLI-based TGV solvers exceeding 1.5x. The results also show that performance sensitivity is not limited to launch shape. At fixed cell count, changing the input problem shape changes precomputed-replay runtime by 0.8-34.6% in representative cases, while kernel-level timing variability depends on the interaction between runtime contribution, input problem shape, and GPU/backend behavior. Overall, automatic per-kernel block/workgroup-shape selection improves OPS performance across GPUs, provided shape sensitivity and timing stability are interpreted together.