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Document SYCL backend behavior with no selected GPU architecture #620

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Document SYCL backend behavior with no selected GPU architecture #620

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5 changes: 5 additions & 0 deletions docs/source/keywords.rst
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Expand Up @@ -734,6 +734,11 @@ Kokkos will attempt to autodetect the architecture flag at configuration time.
Intel GPUs
~~~~~~~~~~

If the SYCL backend is enabled and no GPU architecture is specified,
Kokkos will use Just-In-Time (JIT) compilation and select the first visible device for the default execution space instance.
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Although the discussion about device selection is important, I am not sure it belongs here

There is no restriction to a particular SYCL device type.
Thus, this is the only option to target a CPU with the SYCL backend (which is experimental, untested, and not optimized for).
Comment on lines +737 to +740
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Does that imply we define Kokkos_ARCH_INTEL_GEN=ON if no Intel GPU arch is enabled or is it more subtle than that?

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No, we can't assume that we are building for an Intel GPU so we don't define enable any extra Kokkos_ARCH* options.


.. list-table::
:widths: 25 35 40
:header-rows: 1
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