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author | Jacques Lucke <jacques@blender.org> | 2021-11-26 13:05:47 +0300 |
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committer | Jacques Lucke <jacques@blender.org> | 2021-11-26 13:06:16 +0300 |
commit | 658fd8df0bd2427cd77e7fc4bcca8a102f67b626 (patch) | |
tree | 574c5a6f4c11db7047a98ca38c6d6f129a4b10e2 /source/blender/editors | |
parent | 004172de38d5483b715a5b13d06c2aa5dd3de3f5 (diff) |
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
```
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