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BLI: add chunked list data structure that uses linear allocator #118774

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Jacques Lucke merged 12 commits from JacquesLucke/blender:linear-allocator-unordered-list into main 2024-02-28 22:22:30 +01:00
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Jacques Lucke commented 2024-02-27 01:18:45 +01:00
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This adds a new special purpose container data structure that can be used to gather many elements into many (potentially small) lists efficiently.

I originally worked on this data structure because I might want to use it in #118772. However, also it's useful in the geometry nodes logger already. I'm measuring a 10-20% speed improvement in my many-math-nodes file when I enable logging for all sockets (not just the ones that are currently visible).

This adds a new special purpose container data structure that can be used to gather many elements into many (potentially small) lists efficiently. I originally worked on this data structure because I might want to use it in #118772. However, also it's useful in the geometry nodes logger already. I'm measuring a 10-20% speed improvement in my many-math-nodes file when I enable logging for all sockets (not just the ones that are currently visible).
Jacques Lucke added 7 commits 2024-02-27 01:18:55 +01:00
Hans Goudey reviewed 2024-02-27 03:52:19 +01:00
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Comparing this VectorList, and your old ChunkList container, I guess this makes more sense for a small number of elements? i.e. the goal is to avoid wasting memory than avoiding reallocations?

Comparing this `VectorList`, and your old `ChunkList` [container](https://projects.blender.org/JacquesLucke/blender/compare/main...temp-chunk-list), I guess this makes more sense for a small number of elements? i.e. the goal is to avoid wasting memory than avoiding reallocations?
Jacques Lucke commented 2024-02-27 09:36:34 +01:00
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Yeah, and also to avoid many small allocations when having potentially very many of these vectors. With this new type, they can all share the same few global allocations.

Yeah, and also to avoid many small allocations when having potentially very many of these vectors. With this new type, they can all share the same few global allocations.
Iliya Katushenock reviewed 2024-02-27 14:46:14 +01:00
source/blender/blenlib/BLI_linear_allocator_unordered_list.hh Outdated
@ -0,0 +12,4 @@
namespace blender::linear_allocator {
template<typename T, int64_t Capacity> struct UnorderedListSegment {
Iliya Katushenock commented 2024-02-27 14:46:14 +01:00
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Is there the chance to have structure with ~the same fields (next, size) but with runtime size of values (so kind of raw bits array with header and values)?
It is good to just have template, but sometime you just want to push span with known size in trivial way..

Is there the chance to have structure with ~the same fields (`next`, `size`) but with runtime size of values (so kind of raw bits array with header and values)? It is good to just have template, but sometime you just want to push span with known size in trivial way..
Jacques Lucke commented 2024-02-28 11:39:13 +01:00
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In theory we could have that, but this is a very special purpose data structure, and currently we need the ability you're requesting. Supporting it would cause additional overhead.

In theory we could have that, but this is a very special purpose data structure, and currently we need the ability you're requesting. Supporting it would cause additional overhead.
JacquesLucke marked this conversation as resolved
Jacques Lucke added 2 commits 2024-02-28 12:00:43 +01:00
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Jacques Lucke commented 2024-02-28 12:03:09 +01:00
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@blender-bot build

@blender-bot build
Jacques Lucke requested review from Hans Goudey 2024-02-28 12:03:17 +01:00
Jacques Lucke changed title from WIP: BLI: add unordered list data structure that uses linear allocator to BLI: add unordered list data structure that uses linear allocator 2024-02-28 12:03:27 +01:00
Hans Goudey reviewed 2024-02-28 17:01:35 +01:00
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Looks good to me. Thanks for adding more to the comment. How about calling this ChunkedList? The "unordered" part doesn't seem as important as the fact that multiple items are stored together in small chunks.

Looks good to me. Thanks for adding more to the comment. How about calling this `ChunkedList`? The "unordered" part doesn't seem as important as the fact that multiple items are stored together in small chunks.
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source/blender/blenlib/BLI_linear_allocator_unordered_list.hh Outdated
@ -0,0 +1,190 @@
/* SPDX-FileCopyrightText: 2023 Blender Authors
Hans Goudey commented 2024-02-28 16:59:19 +01:00
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2024

2024
JacquesLucke marked this conversation as resolved
Jacques Lucke added 3 commits 2024-02-28 22:16:50 +01:00
Hans Goudey approved these changes 2024-02-28 22:17:36 +01:00
Jacques Lucke changed title from BLI: add unordered list data structure that uses linear allocator to BLI: add chunked list data structure that uses linear allocator 2024-02-28 22:18:24 +01:00
Jacques Lucke merged commit fe2a47b5a7 into main 2024-02-28 22:22:30 +01:00
Jacques Lucke deleted branch linear-allocator-unordered-list 2024-02-28 22:22:34 +01:00
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