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[Merged by Bors] - Use more ergonomic span syntax #4246

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@cart cart commented Mar 17, 2022

Tracing added support for "inline span entering", which cuts down on a lot of complexity:

let span = info_span!("my_span").entered();

This adapts our code to use this pattern where possible, and updates our docs to recommend it.

This produces equivalent tracing behavior. Here is a side by side profile of "before" and "after" these changes.
image

@github-actions github-actions bot added the S-Needs-Triage This issue needs to be labelled label Mar 17, 2022
@cart cart added C-Code-Quality A section of code that is hard to understand or change A-Diagnostics Logging, crash handling, error reporting and performance analysis and removed S-Needs-Triage This issue needs to be labelled labels Mar 17, 2022
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Are those performance gains real? It looks like the second tracing result is about 10% faster :)

@alice-i-cecile alice-i-cecile added the S-Ready-For-Final-Review This PR has been approved by the community. It's ready for a maintainer to consider merging it label Mar 18, 2022
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cart commented Mar 18, 2022

The one on the right is scaled differently than the one on the left. Combine that with per-frame variance and I think that explains everything :)

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cart commented Mar 18, 2022

bors r+

bors bot pushed a commit that referenced this pull request Mar 18, 2022
Tracing added support for "inline span entering", which cuts down on a lot of complexity:

```rust
let span = info_span!("my_span").entered();
```

This adapts our code to use this pattern where possible, and updates our docs to recommend it.

This produces equivalent tracing behavior. Here is a side by side profile of "before" and "after" these changes.
![image](https://user-images.githubusercontent.com/2694663/158912137-b0aa6dc8-c603-425f-880f-6ccf5ad1b7ef.png)
@bors bors bot changed the title Use more ergonomic span syntax [Merged by Bors] - Use more ergonomic span syntax Mar 18, 2022
@bors bors bot closed this Mar 18, 2022
aevyrie pushed a commit to aevyrie/bevy that referenced this pull request Jun 7, 2022
Tracing added support for "inline span entering", which cuts down on a lot of complexity:

```rust
let span = info_span!("my_span").entered();
```

This adapts our code to use this pattern where possible, and updates our docs to recommend it.

This produces equivalent tracing behavior. Here is a side by side profile of "before" and "after" these changes.
![image](https://user-images.githubusercontent.com/2694663/158912137-b0aa6dc8-c603-425f-880f-6ccf5ad1b7ef.png)
ItsDoot pushed a commit to ItsDoot/bevy that referenced this pull request Feb 1, 2023
Tracing added support for "inline span entering", which cuts down on a lot of complexity:

```rust
let span = info_span!("my_span").entered();
```

This adapts our code to use this pattern where possible, and updates our docs to recommend it.

This produces equivalent tracing behavior. Here is a side by side profile of "before" and "after" these changes.
![image](https://user-images.githubusercontent.com/2694663/158912137-b0aa6dc8-c603-425f-880f-6ccf5ad1b7ef.png)
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