[Merged by Bors] - [ecs] Improve Commands performance
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NathanSWard
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A-ECS
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Here is a list of the minimal performance tests I created. |
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I have a feeling that since this is a pretty specialized structure I should probably just move it into |
NathanSWard
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Jun 11, 2021
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Hmm, should we maybe pull the commands benchmark into a separate PR and merge it earlier? It's far less controversial than the unsafe anystack impl, and reducing the scope of PR s with unsafe is usually a good thing |
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DJMcNab
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I'll go ahead and run miri with this sometime today/tomorrow and report back the results. |
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Here are the most recent benchmarks (taken from #2334). |
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As @mockersf suggested I created a benchmark that utilized |
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benchmarks for the most recent version. (with special casing for 0 sized commands and ensuring the vector isn't null). |
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@cart this should be good to go now :) |
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bors r+ |
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# Objective
- Currently `Commands` are quite slow due to the need to allocate for each command and wrap it in a `Box<dyn Command>`.
- For example:
```rust
fn my_system(mut cmds: Commands) {
cmds.spawn().insert(42).insert(3.14);
}
```
will have 3 separate `Box<dyn Command>` that need to be allocated and ran.
## Solution
- Utilize a specialized data structure keyed `CommandQueueInner`.
- The purpose of `CommandQueueInner` is to hold a collection of commands in contiguous memory.
- This allows us to store each `Command` type contiguously in memory and quickly iterate through them and apply the `Command::write` trait function to each element.
bors
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Commands performanceCommands performance
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Jul 27, 2021
# Objective
- Currently `Commands` are quite slow due to the need to allocate for each command and wrap it in a `Box<dyn Command>`.
- For example:
```rust
fn my_system(mut cmds: Commands) {
cmds.spawn().insert(42).insert(3.14);
}
```
will have 3 separate `Box<dyn Command>` that need to be allocated and ran.
## Solution
- Utilize a specialized data structure keyed `CommandQueueInner`.
- The purpose of `CommandQueueInner` is to hold a collection of commands in contiguous memory.
- This allows us to store each `Command` type contiguously in memory and quickly iterate through them and apply the `Command::write` trait function to each element.
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Objective
Commandsare quite slow due to the need to allocate for each command and wrap it in aBox<dyn Command>.will have 3 separate
Box<dyn Command>that need to be allocated and ran.Solution
CommandQueueInner.CommandQueueInneris to hold a collection of commands in contiguous memory.Commandtype contiguously in memory and quickly iterate through them and apply theCommand::writetrait function to each element.