Introduce PR Benchmark Workflow #18

	name: Benchmark PR

	on:
	pull_request:
	branches: [main]
	workflow_dispatch:
	env:
	PYTHON_VERSION: "3.10"
	WORKING_DIR: ${{ github.workspace }}/benchmarks

	FAIL_THRSHOLD: 1.1

	jobs:
	benchmark-pr:
	runs-on: ubuntu-latest
	if: contains(github.event.pull_request.labels.*.name, 'run_benchmarks') \|\| github.event_name == 'workflow_dispatch'

	defaults:
	run:
	working-directory: ${{ env.WORKING_DIR }}

	steps:

	- name: Checkout repository
	uses: actions/checkout@v3
	with:
	fetch-depth: 0

	- name: Set up Python
	uses: actions/setup-python@v4
	with:
	python-version: ${{ env.PYTHON_VERSION }}

	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install asv virtualenv lf-asv-formatter

	- name: Create ASV machine config file
	run: asv machine --machine gh-runner --yes

	- name: Save comparison of PR against main branch
	run: \|
	# prepare main branch for comparison
	git remote add upstream https://github.com/${{ github.repository }}.git
	git fetch upstream main

	# Run benchmarks, writing comment contents to ./output
	asv continuous upstream/main HEAD \
	--sort ratio --split --interleave-rounds -a repeat=3
	asv compare upstream/main HEAD --sort ratio --split \| tee output
	mv output ${{ env.ARTIFACTS_DIR }}

	- name: Upload benchmark results
	uses: actions/upload-artifact@v2
	with:
	name: benchmark-results-${{ github.sha }}
	path: ${{ env.ARTIFACTS_DIR }}

	- name: Set benchmark output
	run: \|
	echo "Success: [Benchmark Results](${{ github.server_url }}/${{ github.repository }}/actions/artifacts/${{ steps.upload.outputs.artifactId }})"

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