Version: Unity 6.1 Alpha (6000.1)
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SystemInfo.computeSubGroupSize

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public static int computeSubGroupSize;

Description

Size of the compute thread group that supports efficient memory sharing on the GPU (Read Only).

The most efficient thread group size for a set of compute shader calls. This value takes synchronization and shared data into account. This value is a subset of the total workgroup size. It is also known as a "warp" or a "wavefront".

Additional resources:ComputeShader class, supportsComputeShaders.