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use bevy_ecs::Resources;
use bevy_tasks::{AsyncComputeTaskPool, ComputeTaskPool, IOTaskPool, TaskPoolBuilder};
#[derive(Clone)]
pub struct TaskPoolThreadAssignmentPolicy {
pub min_threads: usize,
pub max_threads: usize,
pub percent: f32,
}
impl TaskPoolThreadAssignmentPolicy {
fn get_number_of_threads(&self, remaining_threads: usize, total_threads: usize) -> usize {
assert!(self.percent >= 0.0);
let mut desired = (total_threads as f32 * self.percent).round() as usize;
desired = desired.min(remaining_threads);
bevy_math::clamp(desired, self.min_threads, self.max_threads)
}
}
#[derive(Clone)]
pub struct DefaultTaskPoolOptions {
pub min_total_threads: usize,
pub max_total_threads: usize,
pub io: TaskPoolThreadAssignmentPolicy,
pub async_compute: TaskPoolThreadAssignmentPolicy,
pub compute: TaskPoolThreadAssignmentPolicy,
}
impl Default for DefaultTaskPoolOptions {
fn default() -> Self {
DefaultTaskPoolOptions {
min_total_threads: 1,
max_total_threads: std::usize::MAX,
io: TaskPoolThreadAssignmentPolicy {
min_threads: 1,
max_threads: 4,
percent: 0.25,
},
async_compute: TaskPoolThreadAssignmentPolicy {
min_threads: 1,
max_threads: 4,
percent: 0.25,
},
compute: TaskPoolThreadAssignmentPolicy {
min_threads: 1,
max_threads: std::usize::MAX,
percent: 1.0,
},
}
}
}
impl DefaultTaskPoolOptions {
pub fn with_num_threads(thread_count: usize) -> Self {
let mut options = Self::default();
options.min_total_threads = thread_count;
options.max_total_threads = thread_count;
options
}
pub fn create_default_pools(&self, resources: &mut Resources) {
let total_threads = bevy_math::clamp(
bevy_tasks::logical_core_count(),
self.min_total_threads,
self.max_total_threads,
);
log::trace!("Assigning {} cores to default task pools", total_threads);
let mut remaining_threads = total_threads;
if !resources.contains::<IOTaskPool>() {
let io_threads = self
.io
.get_number_of_threads(remaining_threads, total_threads);
log::trace!("IO Threads: {}", io_threads);
remaining_threads = remaining_threads.saturating_sub(io_threads);
resources.insert(IOTaskPool(
TaskPoolBuilder::default()
.num_threads(io_threads)
.thread_name("IO Task Pool".to_string())
.build(),
));
}
if !resources.contains::<AsyncComputeTaskPool>() {
let async_compute_threads = self
.async_compute
.get_number_of_threads(remaining_threads, total_threads);
log::trace!("Async Compute Threads: {}", async_compute_threads);
remaining_threads = remaining_threads.saturating_sub(async_compute_threads);
resources.insert(AsyncComputeTaskPool(
TaskPoolBuilder::default()
.num_threads(async_compute_threads)
.thread_name("Async Compute Task Pool".to_string())
.build(),
));
}
if !resources.contains::<ComputeTaskPool>() {
let compute_threads = self
.compute
.get_number_of_threads(remaining_threads, total_threads);
log::trace!("Compute Threads: {}", compute_threads);
resources.insert(ComputeTaskPool(
TaskPoolBuilder::default()
.num_threads(compute_threads)
.thread_name("Compute Task Pool".to_string())
.build(),
));
}
}
}