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- Feb 17 2015, 4:36 PM (127 w, 2 d)
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@George Kyriazis (kyriazis), @Lenny Wang (lennyhpc) : Please correct me, If I am wrong in making the following statements.
@Sergey Sharybin (sergey) : sd_fetch() is added in order to realize the structure-of-arrays implementation for ShaderData structure. The structure of arrays implementation facilitates a coalesced memory access to ShaderData structure, which is a good memory access pattern for GPUs.
Also considering the huge size of ShaderData structure, sometimes the compiler generates code with spilled registers (spilled registers reside in high-latency global memory). This usage of spilled registers actually increases the global memory fetches in some cases.
We observed performance improvement after doing the structure-of-arrays implementation of ShaderData structure.