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[Merged by Bors] - Docs: Show how to compare two different traces in Tracy #6869

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[Merged by Bors] - Docs: Show how to compare two different traces in Tracy #6869

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4 changes: 4 additions & 0 deletions docs/profiling.md
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Expand Up @@ -48,6 +48,10 @@ Or you can select an individual system and inspect its statistics (available thr

![A graph and statistics in the Tracy GUI showing the distribution of execution times of an instrumented span in the application](https://user-images.githubusercontent.com/302146/163988464-86e1a3ee-e97b-49ae-9f7e-4ff2b8b761ad.png)

If you save more than one trace, you can compare the spans between both of them by clicking the `Compare` button at the top of the UI. This will open a dialog box asking to load a second trace. From there, it's possible to select any family of spans to more closely compare the timing and distribution of a particular span.

![A graph and statistics in the Tracy GUI comparing the distribution of execution times of an instrumented span across two traces](https://user-images.githubusercontent.com/3137680/205834698-84405b2f-97b5-43a3-9dba-385167ac1db5.png)

### Adding your own spans

Add spans to your app like this (these are in `bevy::prelude::*` and `bevy::log::*`, just like the normal logging macros).
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