Vulkan Subgroup Functionality

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Vulkan 1.1 adds subgroups that let invocations share data without shared memory, speeding reductions and cutting atomics; subgroup size ranges 1 to 128 (common: 32 on NVIDIA, 64 on AMD). Built-ins include ballots returning a uvec4, shuffle/shuffle_xor/shuffle_up/down, inclusive/exclusive scans, clustered and partitioned subgroup ops, quad (2×2) helpers, plus execution and memory barriers. NVIDIA maps these to fast native shuffle instructions and recommends workgroup sizes that are integer multiples of the subgroup.

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" chapters (21)

1. 0:00Intro
2. 0:51Motivation
3. 2:26What are Subgroups?
4. 4:46Vulkan 1.1 API: Subgroup Properties
5. 10:05Subgroup Vote Operations
6. 11:17Subgroup Basic and Vote Examples
7. 13:10Subgroup Arithmetic Operations
8. 15:23Subgroup Arithmetic Examples
9. 17:03Subgroup Ballot Operations
10. 22:03Subgroup Ballot Examples
11. 23:56Subgroup Shuffle Operations
12. 25:42Subgroup Shuffle Examples
13. 26:27Subgroup Shuffle Relative Operations
14. 28:03Subgroup Clustered Operations
15. 30:08Subgroup Quad Operations
16. 31:41Subgroup Quad Examples
17. 32:20Subgroup Partitioned Operations (NV)
18. 34:14Subgroup Partitioned Examples
19. 36:38NVIDIA Implementation Details
20. 39:45HLSL SM 6.0 Wave Ops Comparison
21. 42:18References