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Profile par_for_each(_mut) tasks (#4711)

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# Objective
`Query::par_for_each` and it's variants do not show up when profiling using `tracy` or other profilers. Failing to show the impact of changing batch size, the overhead of scheduling tasks, overall thread utilization, etc. other than the effect on the surrounding system.

## Solution
Add a child span that is entered on every spawned task.

Example view of the results in `tracy` using a modified `parallel_query`: 
![image](https://user-images.githubusercontent.com/3137680/167560036-626bd091-344b-4664-b323-b692f4f16084.png)

---

## Changelog
Added: `tracing` spans for `Query::par_for_each` and its variants. Spans should now be visible for all
This commit is contained in:
James Liu 2022-05-13 00:33:13 +00:00
parent 3d8d922566
commit 0166c4f7fc
1 changed files with 30 additions and 6 deletions
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36
crates/bevy_ecs/src/query/state.rs
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@ -11,6 +11,8 @@ use crate::{
world::{World, WorldId},
};
use bevy_tasks::TaskPool;
#[cfg(feature = "trace")]
use bevy_utils::tracing::Instrument;
use fixedbitset::FixedBitSet;
use std::fmt;
@ -856,7 +858,8 @@ impl<Q: WorldQuery, F: WorldQuery> QueryState<Q, F> {
let mut offset = 0;
while offset < table.len() {
let func = func.clone();
scope.spawn(async move {
let len = batch_size.min(table.len() - offset);
let task = async move {
let mut fetch =
QF::init(world, &self.fetch_state, last_change_tick, change_tick);
let mut filter = <QueryFetch<F> as Fetch>::init(
@ -869,7 +872,6 @@ impl<Q: WorldQuery, F: WorldQuery> QueryState<Q, F> {
let table = &tables[*table_id];
fetch.set_table(&self.fetch_state, table);
filter.set_table(&self.filter_state, table);
let len = batch_size.min(table.len() - offset);
for table_index in offset..offset + len {
if !filter.table_filter_fetch(table_index) {
continue;
@ -877,7 +879,17 @@ impl<Q: WorldQuery, F: WorldQuery> QueryState<Q, F> {
let item = fetch.table_fetch(table_index);
func(item);
}
});
};
#[cfg(feature = "trace")]
let span = bevy_utils::tracing::info_span!(
"par_for_each",
query = std::any::type_name::<Q>(),
filter = std::any::type_name::<F>(),
count = len,
);
#[cfg(feature = "trace")]
let task = task.instrument(span);
scope.spawn(task);
offset += batch_size;
}
}
@ -888,7 +900,8 @@ impl<Q: WorldQuery, F: WorldQuery> QueryState<Q, F> {
let archetype = &archetypes[*archetype_id];
while offset < archetype.len() {
let func = func.clone();
scope.spawn(async move {
let len = batch_size.min(archetype.len() - offset);
let task = async move {
let mut fetch =
QF::init(world, &self.fetch_state, last_change_tick, change_tick);
let mut filter = <QueryFetch<F> as Fetch>::init(
@ -902,14 +915,25 @@ impl<Q: WorldQuery, F: WorldQuery> QueryState<Q, F> {
fetch.set_archetype(&self.fetch_state, archetype, tables);
filter.set_archetype(&self.filter_state, archetype, tables);
let len = batch_size.min(archetype.len() - offset);
for archetype_index in offset..offset + len {
if !filter.archetype_filter_fetch(archetype_index) {
continue;
}
func(fetch.archetype_fetch(archetype_index));
}
});
};
#[cfg(feature = "trace")]
let span = bevy_utils::tracing::info_span!(
"par_for_each",
query = std::any::type_name::<Q>(),
filter = std::any::type_name::<F>(),
count = len,
);
#[cfg(feature = "trace")]
let task = task.instrument(span);
scope.spawn(task);
offset += batch_size;
}
}