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rseng-gpu-computing

Covers GPU and accelerator programming for research software: choosing a programming model (CUDA, HIP, SYCL, OpenACC, OpenMP offloading), GPU libraries, language bindings such as CuPy, PyCUDA and CUDA.jl, portability layers like Kokkos and Raja, source-to-source translation, kernel profiling and auto-tuning. Use when the user wants to port research code to GPUs, pick between CUDA and portable alternatives, call GPU code from Python or Julia, tune or profile kernels, or mentions HIP, SYCL, OpenACC, Kokkos or Kernel Tuner.

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GPU programming for research software

Accelerators dominate modern research computing, but the ecosystem is fragmented: vendor-native models, portability layers and language bindings each trade performance against maintainability. This skill turns that landscape into decision support.

Choosing a programming model

  • CUDA: NVIDIA-native; largest ecosystem and learning material; locks the code to one vendor.
  • HIP: AMD's near-CUDA model; a pragmatic path when AMD hardware is in scope, with source-to-source translation available from CUDA.
  • SYCL: single-source C++ across vendors; growing research adoption.
  • OpenACC / OpenMP offloading: directive-based; the gentlest port for existing Fortran/C code, at some control cost.

Decide by: target machines (which vendors, for how long), the team's languages, and how much low-level control the kernels genuinely need. Prefer libraries over hand-written kernels wherever an existing GPU library covers the computation.

Calling GPUs from high-level languages

Research code rarely starts in C++: CuPy and PyCUDA (Python) and CUDA.jl (Julia) expose GPU arrays and kernels with far less ceremony. Reach for them before rewriting a pipeline in a systems language, and keep the array-API boundary clean so kernels stay swappable.

Portability layers

Kokkos and Raja abstract over backends for C++ codebases that must outlive any single vendor; they suit infrastructure-tier software with long horizons more than one-off analysis kernels.

Performance work

  • Profile before optimizing, with the vendor profilers; measure transfers as well as kernels - data movement dominates many research workloads.
  • Auto-tuning tools (for example Kernel Tuner) search launch configurations systematically; prefer them to hand-tuned magic numbers, and record tuned configurations per hardware target.
  • Keep a CPU reference path for correctness testing (rseng-testing) and document the hardware requirements (rseng-documentation, rseng-reproducible-environments for the driver/toolkit environment).

Working with this skill

The generated references.md beside this file lists the source material and pointers:

  • references.md - verified Learn more pointers

Learn more (verified):

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Related skills

Check whether any of these applies before moving on:

  • rseng-green-computing - accelerator energy efficiency matching
  • rseng-hpc-computing - running GPU jobs on clusters
  • rseng-numerical-accuracy - float32 precision consequences
  • rseng-performance-profiling - verify GPU is warranted first
  • rseng-reproducible-environments - driver and toolkit pinning
  • rseng-testing - CPU reference path for correctness
<!-- related-skills:end -->

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