rich7421/ray-data-gpu-idle-profiles

Ray Data GPU Idle Profiles (B200) Nsight Systems profiles (exported to SQLite, readable by nsys-ai) from an experiment on how a Ray Data pipeline keeps a GPU idle, and how the loss splits between moving data and waiting for data. Captured on a single NVIDIA B200 with Ray 2.58.0 / master, PyTorch 2.14.0+cu130, Nsight Systems 2026.1.3. These profiles back the write-up in the iThome Ironman series 「GPU 很忙？他真的有在做事嗎？」 (Days 27–29), and are shared so the numbers and the before/after… See the full description on the dataset page: https://huggingface.co/datasets/rich7421/ray-data-gpu-idle-profiles.

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