[Bf-blender-cvs] [374c4f168d6] master: Mesh evaluate: Tweak threadability criteria

[Sergey Sharybin]

Commit: 374c4f168d6278c100cb88d192d1eec6e243247b
Author: Sergey Sharybin
Date:   Thu Jan 11 15:04:13 2018 +0100
Branches: master
https://developer.blender.org/rB374c4f168d6278c100cb88d192d1eec6e243247b

Mesh evaluate: Tweak threadability criteria

Gives measurable speedup on layout scenes from Spring.

Actual value for chunk size is a subject for more scientific research.

===================================================================

M       source/blender/blenkernel/intern/mesh_evaluate.c

===================================================================

diff --git a/source/blender/blenkernel/intern/mesh_evaluate.c 
b/source/blender/blenkernel/intern/mesh_evaluate.c
index b321065d84c..76c629912ac 100644
--- a/source/blender/blenkernel/intern/mesh_evaluate.c
+++ b/source/blender/blenkernel/intern/mesh_evaluate.c
@@ -287,12 +287,11 @@ void BKE_mesh_calc_normals_poly(
         int numLoops, int numPolys, float (*r_polynors)[3],
         const bool only_face_normals)
 {
-       const bool do_threaded = (numPolys > BKE_MESH_OMP_LIMIT);
        float (*pnors)[3] = r_polynors;
 
        ParallelRangeSettings settings;
        BLI_parallel_range_settings_defaults(&settings);
-       settings.use_threading = do_threaded;
+       settings.min_iter_per_thread = 1024;
 
        if (only_face_normals) {
                BLI_assert((pnors != NULL) || (numPolys == 0));

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