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# Profiling LibSass
## Linux perf and pprof
On Linux, you can record the profile with `perf` and inspect it with `pprof`.
### Install required tools
Pre-requisites:
1. Linux `perf`, commonly found in the `linux-tools-generic` package.
2. [go], for installing `pprof`.
3. [bazel], for installing `perf_to_profile`.
[go]: https://golang.org
[bazel]: https://bazel.build
First, install `pprof` with:
```bash
go get -u github.com/google/pprof
```
Then, build and install `perf_to_profile`:
```bash
git clone https://github.com/google/perf_data_converter
cd perf_data_converter
bazel build -c opt src:perf_to_profile
sudo cp bazel-bin/src/perf_to_profile /usr/local/bin/
```
Finally, in your libsass repository, clone and build `sassc`:
```bash
git clone https://github.com/sass/sassc.git
make sassc
```
### Record perf data
```bash
sudo perf record sassc/bin/sassc input.scss > /dev/null && sudo chown $USER:$USER perf.data
```
This will create a `perf.data` file that you can vizualize with `pprof`.
### Inspect perf data
A web server with various visualization options:
```bash
pprof -http=localhost:3232 sassc/bin/sassc perf.data
```
Simple text output:
```bash
pprof -text sassc/bin/sassc perf.data
```
Example output:
```
flat flat% sum% cum cum%
24651348 6.97% 6.97% 24651348 6.97% [[kernel.kallsyms]]
20746241 5.87% 12.84% 20746241 5.87% Sass::SharedPtr::decRefCount
18401663 5.20% 18.04% 20420896 5.78% __libc_malloc
15205959 4.30% 22.34% 15205959 4.30% [libc-2.27.so]
12974307 3.67% 26.01% 14070189 3.98% _int_malloc
10958857 3.10% 29.11% 10958857 3.10% Sass::SharedPtr::incRefCount
9837672 2.78% 31.89% 18433250 5.21% cfree
```
|
