https://github.com/hargoniX/Flame

https://github.com/hargoniX/Flame

Last synced: about 2 months ago
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• Host: GitHub
• URL: https://github.com/hargoniX/Flame
• Owner: hargoniX
• License: mit
• Created: 2023-03-25T20:54:30.000Z (almost 2 years ago)
• Default Branch: main
• Last Pushed: 2023-05-11T20:19:32.000Z (over 1 year ago)
• Last Synced: 2024-11-19T02:11:51.490Z (2 months ago)
• Language: Lean
• Size: 193 KB
• Stars: 9
• Watchers: 2
• Forks: 1
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# LeanFlame

View your Lean 4 compiler trace as a flamegraph.

## How does it work

You compile the tool using `lake build`, then you run it like so:

```

$ cat trace.txt | ./build/bin/flame > out.txt

```

where `trace.txt` is output from your Lean infoview with the options:

```lean

set_option trace.profiler true

set_option pp.oneline true

```

enabled either just in some block of your code or the entire file.

Alternatively you can also run:

```

$ lake env lean -D trace.profiler=true -D pp.oneline=true file.lean > trace.txt

```

or also directly!

```

$ lake env lean -D trace.profiler=true -D pp.oneline=true file.lean | /path/to/flame > out.txt

```

To obtain a trace for an entire file without editing it.

You can also concatenate multiple traces into one big file if you desire:

```

$ cat trace1.txt trace2.txt > trace.txt

```

LeanFlame will print its output in the [collapsed stack format](https://github.com/BrendanGregg/flamegraph#2-fold-stacks)

you can use them with for example the `flamegraph.pl` script from the original

flamegraph implementation repository or use an online viewer like

[speedscope](https://www.speedscope.app).

## Example

This example shows how to obtain a trace from the file with (currently) the most lines in

`std4`:

```

$ lake env lean -D trace.profiler=true -D pp.oneline=true Std/Data/List/Lemmas.lean | ../flame/build/bin/flame > trace.txt

$ wc -l trace.txt

1007 trace.txt

$ flamegraph.pl trace.txt > test.svg

```

Resulting in ![this](./img/test.svg)