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However, there is the option to use "Batched" mode. This mode will run multiple shading points via vectorized instructions available on Advanced Vector Extensions 512 (AVX-512) enabled hardware. Speedup with batched OSL is workload dependent -- scenes with a high amount of ray divergence and thus less shader coherence will see less improvement. Scenes with high coherence such as single-bounce or PxrVisualizer and OSL shaders of a significant size will see more improvements. We take care to perform the optimization only when necessary to provide the best performance overall.
It is enabled with the following user option
| Code Block |
|---|
Option "user" "int osl:batched" [1] |
Also, the cost of compiling the shaders and shader networks at runtime can become a significant, especially since this compilation phase will prevent multiple threads from running at their highest efficiency. Normally for scenes that take a while to render, this cost is effectively amortized. However, if there are hundreds of thousands of unique shader instances, that cost can start to impact final render times. The Batched mode may have a greater impact on startup time than non-batched but for complex scenes the overall benefit is worthwhile.
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