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Fix a bad path and simplify one of the examples #520

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Feb 27, 2020
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Fix a bad path and simplify one of the examples #520

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5 changes: 2 additions & 3 deletions posts/inside-rust/2020-02-25-intro-rustc-self-profile.md
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Expand Up @@ -208,11 +208,10 @@ Which shows this `optimized_mir` query was processing the `regex::compile::{{imp

By using the `RUSTFLAGS` environment variable, we can profile every `rustc` invocation, not just the final crate's.
`crox` can then combine all of the profiles together into one output file.
Since this will create a lot of files, we'll first create a folder to put all the traces in.
Since this will create a lot of files, we'll tell `rustc` to create a folder to put all the traces in.

```sh
$ rm regex-17088.* regex-23649.* # clean up the old trace files since we're done with them
$ mkdir profiles
$ cargo clean
$ RUSTFLAGS="-Zself-profile=./profiles -Zself-profile-events=default,args" cargo build
```
Expand All @@ -221,7 +220,7 @@ This creates quite a few trace files in the working directory.
Now, we'll tell `crox` to combine all of the trace files in the current directory together:

```sh
$ crox --dir .
$ crox --dir profiles
```

Opening this file shows all of the crates compiled:
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