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docs: add a section about profiling #2253

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Sep 15, 2023
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docs: add a section about profiling #2253

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18 changes: 18 additions & 0 deletions docs/contributing.md
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Expand Up @@ -320,3 +320,21 @@ you can submit a PR based on the `gh-pages` branch of

The `.rs` files generated from `.proto` files are included in the repository,
and there is a GitHub CI check that will complain if they do not match.

## Profiling

One easy-to-use sampling profiler
is [samply](https://github.com/mstange/samply). For example:
```shell
cargo install samply
samply record jj diff
```
Then just open the link it prints.

Another option is to use the instrumentation we've added manually (using
`tracing::instrument`) in various places. For example:
```shell
JJ_TRACE=/tmp/trace.json jj diff
```
Then go to `https://ui.perfetto.dev/` in Chrome and load `/tmp/trace.json` from
there.