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opencl: Add support for multiple devices #12622

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linehill
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... but limited to one platform for now. A platform with a GPU will be preferred.

Additionally:

  • Filter out devices that lack capabilities needed by the backend implementation (half support, OpenCL 2.0+, etc).

  • Make ggml_backend_opencl_reg() thread-safe.

@github-actions github-actions bot added the ggml changes relating to the ggml tensor library for machine learning label Mar 28, 2025
@linehill linehill marked this pull request as draft March 28, 2025 11:40
@linehill linehill marked this pull request as ready for review April 7, 2025 09:44
@max-krasnyansky
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@lhez please take a look. It makes sense to add multi-device support.

@linehill please rebase once we merge #12886 when you get the chance

... but limited to one platform. A platform with a GPU will be preferred.

Additionally:

* Filter out devices that lack capabilities needed by the backend
  implementation (half support, OpenCL 2.0+, etc).

* Make ggml_backend_opencl_reg() thread-safe.
... when there is only one OpenCL device available.
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