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Commands
benchmarking (#2334)
# Objective - Currently the `Commands` and `CommandQueue` have no performance testing. - As `Commands` are quite expensive due to the `Box<dyn Command>` allocated for each command, there should be perf tests for implementations that attempt to improve the performance. ## Solution - Add some benchmarking for `Commands` and `CommandQueue`.
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@ -16,6 +16,11 @@ name = "system_stage"
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path = "benches/bevy_ecs/stages.rs"
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harness = false
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[[bench]]
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name = "commands"
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path = "benches/bevy_ecs/commands.rs"
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harness = false
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[[bench]]
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name = "iter"
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path = "benches/bevy_tasks/iter.rs"
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177
benches/benches/bevy_ecs/commands.rs
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177
benches/benches/bevy_ecs/commands.rs
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@ -0,0 +1,177 @@
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use bevy::ecs::{
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system::{Command, CommandQueue, Commands},
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world::World,
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};
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use criterion::{black_box, criterion_group, criterion_main, Criterion};
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criterion_group!(
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benches,
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empty_commands,
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spawn_commands,
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fake_commands,
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zero_sized_commands,
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medium_sized_commands,
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large_sized_commands
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);
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criterion_main!(benches);
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struct A;
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struct B;
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struct C;
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fn empty_commands(criterion: &mut Criterion) {
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let mut group = criterion.benchmark_group("empty_commands");
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group.warm_up_time(std::time::Duration::from_millis(500));
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group.measurement_time(std::time::Duration::from_secs(4));
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group.bench_function("0_entities", |bencher| {
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let mut world = World::default();
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let mut command_queue = CommandQueue::default();
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bencher.iter(|| {
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command_queue.apply(&mut world);
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});
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});
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group.finish();
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}
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fn spawn_commands(criterion: &mut Criterion) {
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let mut group = criterion.benchmark_group("spawn_commands");
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group.warm_up_time(std::time::Duration::from_millis(500));
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group.measurement_time(std::time::Duration::from_secs(4));
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for entity_count in (1..5).map(|i| i * 2 * 1000) {
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group.bench_function(format!("{}_entities", entity_count), |bencher| {
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let mut world = World::default();
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let mut command_queue = CommandQueue::default();
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bencher.iter(|| {
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let mut commands = Commands::new(&mut command_queue, &world);
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for i in 0..entity_count {
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let mut entity = commands.spawn();
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if black_box(i % 2 == 0) {
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entity.insert(A);
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}
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if black_box(i % 3 == 0) {
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entity.insert(B);
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}
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if black_box(i % 4 == 0) {
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entity.insert(C);
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}
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if black_box(i % 5 == 0) {
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entity.despawn();
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}
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}
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drop(commands);
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command_queue.apply(&mut world);
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});
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});
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}
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group.finish();
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}
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struct FakeCommandA;
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struct FakeCommandB(u64);
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impl Command for FakeCommandA {
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fn write(self: Box<Self>, world: &mut World) {
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black_box(self);
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black_box(world);
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}
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}
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impl Command for FakeCommandB {
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fn write(self: Box<Self>, world: &mut World) {
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black_box(self);
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black_box(world);
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}
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}
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fn fake_commands(criterion: &mut Criterion) {
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let mut group = criterion.benchmark_group("fake_commands");
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group.warm_up_time(std::time::Duration::from_millis(500));
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group.measurement_time(std::time::Duration::from_secs(4));
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for command_count in (1..5).map(|i| i * 2 * 1000) {
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group.bench_function(format!("{}_commands", command_count), |bencher| {
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let mut world = World::default();
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let mut command_queue = CommandQueue::default();
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bencher.iter(|| {
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let mut commands = Commands::new(&mut command_queue, &world);
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for i in 0..command_count {
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if black_box(i % 2 == 0)
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commands.add(FakeCommandA);
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} else {
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commands.add(FakeCommandB(0));
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}
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}
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drop(commands);
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command_queue.apply(&mut world);
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});
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});
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}
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group.finish();
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}
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#[derive(Default)]
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struct SizedCommand<T: Default + Send + Sync + 'static>(T);
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impl<T: Default + Send + Sync + 'static> Command for SizedCommand<T> {
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fn write(self: Box<Self>, world: &mut World) {
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black_box(self);
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black_box(world);
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}
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}
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struct LargeStruct([u64; 64]);
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impl Default for LargeStruct {
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fn default() -> Self {
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Self([0; 64])
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}
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}
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fn sized_commands_impl<T: Default + Command>(criterion: &mut Criterion) {
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let mut group =
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criterion.benchmark_group(format!("sized_commands_{}_bytes", std::mem::size_of::<T>()));
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group.warm_up_time(std::time::Duration::from_millis(500));
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group.measurement_time(std::time::Duration::from_secs(4));
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for command_count in (1..5).map(|i| i * 2 * 1000) {
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group.bench_function(format!("{}_commands", command_count), |bencher| {
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let mut world = World::default();
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let mut command_queue = CommandQueue::default();
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bencher.iter(|| {
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let mut commands = Commands::new(&mut command_queue, &world);
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for _ in 0..command_count {
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commands.add(T::default());
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}
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drop(commands);
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command_queue.apply(&mut world);
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});
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});
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}
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group.finish();
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}
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fn zero_sized_commands(criterion: &mut Criterion) {
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sized_commands_impl::<SizedCommand<()>>(criterion);
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}
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fn medium_sized_commands(criterion: &mut Criterion) {
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sized_commands_impl::<SizedCommand<(u32, u32, u32)>>(criterion);
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}
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fn large_sized_commands(criterion: &mut Criterion) {
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sized_commands_impl::<SizedCommand<LargeStruct>>(criterion);
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}
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