c8a4026984
Tune the grain size used for the parallel_for to alleviate excessive mutex contention inside `handle_fan_result_and_custom_normals`. I happened to notice that the 4004 Moore Lane USD scene[1] experienced a load time regression compared to the prior release. It looks due to the grain size used and here are some 3-run averages for the import: ``` Grain | Time in seconds 256 (main) | (14.6+14.6+14.8)/3 = 14.6667 1024 | (13+12.8+12.9)/3 = 12.9 4096 | (13.3+13.1+13.1)/3 = 13.1667 16384 | (12.2+12+ 12.5)/3 = 12.2333 65536 | (9.4+9.2+9.6)/3 = 9.4 131072 | (7.9+7.7+8)/3 = 7.8667 262144 | (7.3+7.1+7.2)/3 = 7.2 max(16384, #verts/2) (PR) | (7.1+6.9+6.8)/3 = 6.9333 ``` This PR gets the scenario loading in just under 7 seconds now compared to over 14 originally. [1] https://dpel.aswf.io/4004-moore-lane/ Pull Request: https://projects.blender.org/blender/blender/pulls/141249
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