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Use radsort for Transparent2d PhaseItem sorting #9882
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rparrett
added
A-Rendering
Drawing game state to the screen
C-Performance
A change motivated by improving speed, memory usage or compile times
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Sep 21, 2023
Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
superdump
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Sep 21, 2023
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I think this is fine as-is. But a couple of comments anyway.
rparrett
changed the title
Use radsort for Transparent2d PhaseItems sorting
Use radsort for Transparent2d PhaseItem sorting
Sep 21, 2023
Co-authored-by: Robert Swain <robert.swain@gmail.com>
alice-i-cecile
approved these changes
Sep 21, 2023
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rdrpenguin04
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Jan 9, 2024
# Objective Fix a performance regression in the "[bevy vs pixi](https://github.com/SUPERCILEX/bevy-vs-pixi)" benchmark. This benchmark seems to have a slightly pathological distribution of `z` values -- Sprites are spawned with a random `z` value with a child sprite at `f32::EPSILON` relative to the parent. See discussion here: bevyengine#8100 (comment) ## Solution Use `radsort` for sorting `Transparent2d` `PhaseItem`s. Use random `z` values in bevymark to stress the phase sort. Add an `--ordered-z` option to `bevymark` that uses the old behavior. ## Benchmarks mac m1 max | benchmark | fps before | fps after | diff | | - | - | - | - | | bevymark --waves 120 --per-wave 1000 --random-z | 42.16 | 47.06 | 🟩 +11.6% | | bevymark --waves 120 --per-wave 1000 | 52.50 | 52.29 | 🟥 -0.4% | | bevymark --waves 120 --per-wave 1000 --mode mesh2d --random-z | 9.64 | 10.24 | 🟩 +6.2% | | bevymark --waves 120 --per-wave 1000 --mode mesh2d | 15.83 | 15.59 | 🟥 -1.5% | | bevy-vs-pixi | 39.71 | 59.88 | 🟩 +50.1% | ## Discussion It's possible that `TransparentUi` should also change. We could probably use `slice::sort_unstable_by_key` with the current sort key though, as its items are always sorted and unique. I'd prefer to follow up later to look into that. Here's a survey of sorts used by other `PhaseItem`s #### slice::sort_by_key `Transparent2d`, `TransparentUi` #### radsort `Opaque3d`, `AlphaMask3d`, `Transparent3d`, `Opaque3dPrepass`, `AlphaMask3dPrepass`, `Shadow` I also tried `slice::sort_unstable_by_key` with a compound sort key including `Entity`, but it didn't seem as promising and I didn't test it as thoroughly. --------- Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com> Co-authored-by: Robert Swain <robert.swain@gmail.com>
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Labels
A-Rendering
Drawing game state to the screen
C-Performance
A change motivated by improving speed, memory usage or compile times
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Objective
Fix a performance regression in the "bevy vs pixi" benchmark.
This benchmark seems to have a slightly pathological distribution of
z
values -- Sprites are spawned with a randomz
value with a child sprite atf32::EPSILON
relative to the parent.See discussion here: #8100 (comment)
Solution
Use
radsort
for sortingTransparent2d
PhaseItem
s.Use random
z
values in bevymark to stress the phase sort. Add an--ordered-z
option tobevymark
that uses the old behavior.Benchmarks
mac m1 max
Discussion
It's possible that
TransparentUi
should also change. We could probably useslice::sort_unstable_by_key
with the current sort key though, as its items are always sorted and unique. I'd prefer to follow up later to look into that.Here's a survey of sorts used by other
PhaseItem
sslice::sort_by_key
Transparent2d
,TransparentUi
radsort
Opaque3d
,AlphaMask3d
,Transparent3d
,Opaque3dPrepass
,AlphaMask3dPrepass
,Shadow
I also tried
slice::sort_unstable_by_key
with a compound sort key includingEntity
, but it didn't seem as promising and I didn't test it as thoroughly.