Khronos material explains how subgroups let parallel GPU tasks share and manipulate data, and invites comparison with shared-memory-based approaches.
The Khronos tutorial presents Vulkan 1.1 subgroups, a mechanism for sharing and manipulating data among parallel tasks on a GPU.
Engineers can compare this approach with methods based on shared memory when studying parallelism options. The available excerpt gives no performance results or universal recommendation.
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Test changes in a controlled environment and validate behavior and performance on your own GPU. The tutorial describes a mechanism; it does not replace testing your implementation.