[Merged by Bors] - Speed up Query::get_many and add benchmarks
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alice-i-cecile
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james7132
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crates/bevy_ecs/src/query/state.rs
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| last_change_tick, | ||
| change_tick, | ||
| )?; | ||
| values[i] = MaybeUninit::new(item); |
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This does a bounds check. It's a bit more verbose, but slice::get_unchecked_mut might further speed things up a bit. We know the index must be valid because i must be less than N.
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I ended up using an iterator to remove the bounds checks -- I measured the same performance for both iterators and get_unchecked_mut.
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Oct 29, 2022
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Here's another run:
Criterion output: https://github.com/JoJoJet/files/blob/c4b99129978e2566b2139efb5e96462094c77aed/get-many-benches-output.zip |
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# Objective * Add benchmarks for `Query::get_many`. * Speed up `Query::get_many`. ## Solution Previously, `get_many` and `get_many_mut` used the method `array::map`, which tends to optimize very poorly. This PR replaces uses of that method with loops. ## Benchmarks | Benchmark name | Execution time | Change from this PR | |--------------------------------------|----------------|---------------------| | query_get_many_2/50000_calls_table | 1.3732 ms | -24.967% | | query_get_many_2/50000_calls_sparse | 1.3826 ms | -24.572% | | query_get_many_5/50000_calls_table | 2.6833 ms | -30.681% | | query_get_many_5/50000_calls_sparse | 2.9936 ms | -30.672% | | query_get_many_10/50000_calls_table | 5.7771 ms | -36.950% | | query_get_many_10/50000_calls_sparse | 7.4345 ms | -36.987% |
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Query::get_many and add benchmarksQuery::get_many and add benchmarks
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# Objective * Add benchmarks for `Query::get_many`. * Speed up `Query::get_many`. ## Solution Previously, `get_many` and `get_many_mut` used the method `array::map`, which tends to optimize very poorly. This PR replaces uses of that method with loops. ## Benchmarks | Benchmark name | Execution time | Change from this PR | |--------------------------------------|----------------|---------------------| | query_get_many_2/50000_calls_table | 1.3732 ms | -24.967% | | query_get_many_2/50000_calls_sparse | 1.3826 ms | -24.572% | | query_get_many_5/50000_calls_table | 2.6833 ms | -30.681% | | query_get_many_5/50000_calls_sparse | 2.9936 ms | -30.672% | | query_get_many_10/50000_calls_table | 5.7771 ms | -36.950% | | query_get_many_10/50000_calls_sparse | 7.4345 ms | -36.987% |
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Objective
Query::get_many.Query::get_many.Solution
Previously,
get_manyandget_many_mutused the methodarray::map, which tends to optimize very poorly. This PR replaces uses of that method with loops.Benchmarks