Store resources on sparse sets

benches/benches/bevy_ecs/main.rs

@@ -15,6 +15,7 @@ mod fragmentation;
 mod iteration;
 mod observers;
 mod param;
+mod resources;
 mod scheduling;
 mod world;
 
@@ -28,6 +29,7 @@ criterion_main!(
     iteration::benches,
     fragmentation::benches,
     observers::benches,
+    resources::benches,
     scheduling::benches,
     world::benches,
     param::benches,

benches/benches/bevy_ecs/resources.rs

@@ -0,0 +1,69 @@
+use std::{alloc::Layout, hint::black_box, ptr::NonNull};
+
+use benches::bench;
+use bevy_ecs::{
+    change_detection::MaybeLocation,
+    component::{ComponentCloneBehavior, ComponentDescriptor, StorageType},
+    prelude::*,
+    ptr::OwningPtr,
+};
+use criterion::{criterion_group, Criterion};
+
+criterion_group!(benches, get, get_mut, insert_remove);
+
+fn create_world() -> World {
+    let mut world = World::new();
+    for _ in 0..500 {
+        // SAFETY: Uses zero-sized value, never drops
+        unsafe {
+            let resource_id =
+                world.register_component_with_descriptor(ComponentDescriptor::new_with_layout(
+                    "",
+                    StorageType::SparseSet,
+                    Layout::new::<()>(),
+                    None,
+                    true,
+                    ComponentCloneBehavior::Default,
+                    None,
+                ));
+            world.insert_resource_by_id(
+                resource_id,
+                OwningPtr::new(NonNull::dangling()),
+                MaybeLocation::caller(),
+            );
+        }
+    }
+    world
+}
+
+#[derive(Resource)]
+struct R;
+
+pub fn get(criterion: &mut Criterion) {
+    let mut world = create_world();
+    world.insert_resource(R);
+    criterion.bench_function(bench!("get"), |bencher| {
+        bencher.iter(|| world.get_resource::<R>());
+    });
+}
+
+pub fn get_mut(criterion: &mut Criterion) {
+    let mut world = create_world();
+    world.insert_resource(R);
+    criterion.bench_function(bench!("get_mut"), |bencher| {
+        bencher.iter(|| {
+            black_box(world.get_resource_mut::<R>());
+        });
+    });
+}
+
+pub fn insert_remove(criterion: &mut Criterion) {
+    let mut world = create_world();
+    criterion.bench_function(bench!("insert_remove"), |bencher| {
+        bencher.iter(|| {
+            world.insert_resource(R);
+            black_box(&mut world);
+            world.remove_resource::<R>()
+        });
+    });
+}

crates/bevy_ecs/macros/src/resource.rs

@@ -1,4 +1,4 @@
-use bevy_ecs_macro_logic::component::DeriveComponent;
+use bevy_ecs_macro_logic::component::{DeriveComponent, StorageTy};
 use proc_macro2::TokenStream;
 use quote::quote;
 use syn::{DeriveInput, Path};
@@ -9,6 +9,7 @@ pub fn derive_resource(ast: &mut DeriveInput) -> TokenStream {
         Ok(value) => value,
         Err(e) => return e.into_compile_error(),
     };
+    derive_component.storage = StorageTy::SparseSet;
 
     let struct_name = &ast.ident;
     let (_, type_generics, _) = &ast.generics.split_for_impl();