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SYCL: Avoid using SYCL-Graph for unsupported nodes #13587

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@EwanC EwanC commented May 16, 2025

Currently on a CUDA backend to SYCL when running
GGML_SYCL_DISABLE_GRAPH=0 ./bin/test-backend-ops -b SYCL0 there are two operations that throw an exception from the blocking waits during queue recording.

We've noticed that ggml-cuda.cu has the
check_node_graph_compatibility_and_refresh_copy_ops method for checking if a graph can be used, even if enabled. I've taken a similar approach in this PR by adding a method to ggml-sycl.cpp for checking if a graph can be used for the operations even if a user has asked for it to be enabled.

Currently on a CUDA backend to SYCL when running
`GGML_SYCL_DISABLE_GRAPH=0 ./bin/test-backend-ops -b SYCL0` there
are two operations that throw an exception from the blocking
waits during queue recording.

* `-o CONCAT` : Use of blocking waits on a queue that's being recorded https://github.com/ggml-org/llama.cpp/blob/master/ggml/src/ggml-sycl/concat.cpp#L185-L187
* `-o MUL_MAT_ID`: Blocking wait on a recording queue for a copy to host memory https://github.com/ggml-org/llama.cpp/blob/master/ggml/src/ggml-sycl/ggml-sycl.cpp#L3072-L3074

We've noticed that `ggml-cuda.cu` has the
[check_node_graph_compatibility_and_refresh_copy_ops](https://github.com/ggml-org/llama.cpp/blob/39e73ae0d69f882d7e29cecc6dd8f5052fca6731/ggml/src/ggml-cuda/ggml-cuda.cu#L2458-L2458)
method for checking if a graph can be used, even if enabled. I've taken a
similar approach in this PR by adding a method to `ggml-sycl.cpp` for checking
if a graph can be used for the operations even if a user has asked for it to be
enabled.
@github-actions github-actions bot added ggml changes relating to the ggml tensor library for machine learning SYCL https://en.wikipedia.org/wiki/SYCL - GPU programming language labels May 16, 2025
@EwanC EwanC changed the title SYCL: Avoid using with SYCL-Graph for unsupported nodes SYCL: Avoid using SYCL-Graph for unsupported nodes May 16, 2025
@EwanC EwanC marked this pull request as ready for review May 16, 2025 12:06
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