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Git Commits -> Revision 658fd8d

Revision 658fd8d by Jacques Lucke (master)
November 26, 2021, 10:06 (GMT)
Geometry Nodes: refactor multi-threading in field evaluation

Previously, there was a fixed grain size for all multi-functions. That was
not sufficient because some functions could benefit a lot from smaller
grain sizes.

This refactors adds a new `MultiFunction::call_auto` method which has the
same effect as just calling `MultiFunction::call` but additionally figures
out how to execute the specific multi-function efficiently. It determines
a good grain size and decides whether the mask indices should be shifted
or not.

Most multi-function evaluations benefit from this, but medium sized work
loads (1000 - 50000 elements) benefit from it the most. Especially when
expensive multi-functions (e.g. noise) is involved. This is because for
smaller work loads, threading is rarely used and for larger work loads
threading worked fine before already.

With this patch, multi-functions can specify execution hints, that allow
the caller to execute it most efficiently. These execution hints still
have to be added to more functions.

Some performance measurements of a field evaluation involving noise and
math nodes, ordered by the number of elements being evaluated:
```
1,000,000: 133 ms -> 120 ms
100,000: 30 ms -> 18 ms
10,000: 20 ms -> 2.7 ms
1,000: 4 ms -> 0.5 ms
100: 0.5 ms -> 0.4 ms
```

Commit Details:

Full Hash: 658fd8df0bd2427cd77e7fc4bcca8a102f67b626
Parent Commit: 004172d
Lines Changed: +264, -163

1 Added Path:

/source/blender/functions/intern/multi_function_params.cc (+44, -0) (View)

2 Deleted Paths:

/source/blender/functions/FN_multi_function_parallel.hh (+0, -39)
/source/blender/functions/intern/multi_function_parallel.cc (+0, -93)

10 Modified Paths:

/source/blender/functions/CMakeLists.txt (+1, -2) (Diff)
/source/blender/functions/FN_multi_function.hh (+28, -0) (Diff)
/source/blender/functions/FN_multi_function_params.hh (+14, -15) (Diff)
/source/blender/functions/FN_multi_function_procedure_executor.hh (+3, -0) (Diff)
/source/blender/functions/intern/field.cc (+2, -8) (Diff)
/source/blender/functions/intern/multi_function.cc (+133, -0) (Diff)
/source/blender/functions/intern/multi_function_procedure_executor.cc (+9, -1) (Diff)
/source/blender/nodes/geometry/nodes/node_geo_transfer_attribute.cc (+4, -4) (Diff)
/source/blender/nodes/shader/nodes/node_shader_tex_noise.cc (+8, -0) (Diff)
/source/blender/nodes/shader/nodes/node_shader_tex_voronoi.cc (+18, -1) (Diff)
Tehnyt: Miika HämäläinenViimeksi päivitetty: 07.11.2014 14:18MiikaH:n Sivut a.k.a. MiikaHweb | 2003-2021