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BLI: Let to know about prefix sum to weighted parallel function #120322

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Iliya Katushenock wants to merge 5 commits from mod_moder:parallel_for_weighted into main
pull from: mod_moder:parallel_for_weighted
merge into: blender:main

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Iliya Katushenock commented 2024-04-05 19:57:59 +02:00
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Prefix sum (or offsets, in term of blender library) can provide total sum
of some range in O(1). This is useful for cases where we want to split range
in segments with the same average weigh of elements of range. Currently,
weighted parallel function build such prefix sum on the fly. But in case prefix
sum is already there (for example, offsets of curves), binary search can
reduce overhead by check weigh of range of curves, instead of check each
curve in loop to accumulate total.

This done by adding template overload to parallel_for_weighted.

Prefix sum (or offsets, in term of blender library) can provide total sum of some range in O(1). This is useful for cases where we want to split range in segments with the same average weigh of elements of range. Currently, weighted parallel function build such prefix sum on the fly. But in case prefix sum is already there (for example, offsets of curves), binary search can reduce overhead by check weigh of range of curves, instead of check each curve in loop to accumulate total. This done by adding template overload to `parallel_for_weighted`.
test weight parallel prefix sum.blend
981 KiB
Iliya Katushenock added the
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Iliya Katushenock added 1 commit 2024-04-05 19:58:09 +02:00
Iliya Katushenock added this to the Core Libraries project 2024-04-05 19:58:14 +02:00
Iliya Katushenock added 1 commit 2024-04-05 20:39:25 +02:00
Iliya Katushenock added 1 commit 2024-04-05 21:00:33 +02:00
Iliya Katushenock commented 2024-04-05 21:05:09 +02:00
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I added benchmark file to simplify speed up check compared to per-element overload.
There is a lot of possible distributions / sizes to check, so this file are suitable to be customized for different settings, but there is no something to just open and run. Reviewers will need to manually check things that they think need to be checked. I checked and think this is good, but this will be better to know if this is also good for anyone else.
Changes in node_geo_sort_elements.cc will be revert before commit and right now used as just way to check.

I added benchmark file to simplify speed up check compared to per-element overload. There is a lot of possible distributions / sizes to check, so this file are suitable to be customized for different settings, but there is no something to just open and run. Reviewers will need to manually check things that they think need to be checked. I checked and think this is good, but this will be better to know if this is also good for anyone else. Changes in `node_geo_sort_elements.cc` will be revert before commit and right now used as just way to check.
Iliya Katushenock requested review from Jacques Lucke 2024-04-05 21:05:27 +02:00
Iliya Katushenock added 2 commits 2024-04-06 11:55:37 +02:00
Iliya Katushenock commented 2024-04-26 23:50:48 +02:00
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#121127

#121127
Iliya Katushenock deleted branch parallel_for_weighted 2024-04-26 23:56:40 +02:00

Pull request closed

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