Does subgroup/wave size matter?
This week, I had a conversation with one of my coworkers about our subgroup/wave size heuristic and, in particular, whether or not control-flow divergence should be considered as part of the choice. This lead me down a fun path of looking into the statistics of control-flow divergence and the end result is somewhat surprising: Once you get above about an 8-wide subgroup, the subgroup size doesn't matter.
Before I get into the details, let's talk nomenclature. As you're likely aware, GPUs often execute code in groups of 1 or more invocations. In D3D terminology, these are called waves. In Vulkan and OpenGL terminology, these are called sugroups. The two terms are interchangeable and, for the rest of this post, I'll use the Vulkan/OpenGL conventions.
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