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name: Performance

on:

pull_request:

branches: [main]

push:

branches: [main]

workflow_dispatch:

inputs:

base:

description: Baseline commit/ref (empty uses the candidate's first parent)

required: false

type: string

permissions:

contents: read

concurrency:

group: performance-${{ github.event.pull_request.number || github.run_id }}

cancel-in-progress: ${{ github.event_name == 'pull_request' }}

jobs:

tooling:

name: Validate performance tooling

runs-on: ubuntu-24.04

steps:

- uses: actions/checkout@v5

with:

persist-credentials: false

- name: Test comparison and publication logic

run: python3 -m unittest discover -s .github/performance/tests -v

compare:

name: JMH comparison (Java ${{ matrix.java }})

needs: tooling

runs-on: ubuntu-24.04

timeout-minutes: 45

strategy:

fail-fast: false

matrix:

java: ['21', '25']

steps:

- uses: actions/checkout@v5

with:

ref: ${{ github.event.pull_request.head.sha || github.sha }}

fetch-depth: 0

persist-credentials: false

- uses: actions/setup-java@v5

with:

distribution: corretto

java-version: ${{ matrix.java }}

- uses: actions/cache@v4

with:

path: ${{ runner.temp }}/performance-maven

key: performance-${{ runner.os }}-${{ runner.arch }}-java${{ matrix.java }}-${{ hashFiles('**/pom.xml') }}

restore-keys: performance-${{ runner.os }}-${{ runner.arch }}-java${{ matrix.java }}-

- name: Build and compare immutable revisions

env:

PR_BASE: ${{ github.event.pull_request.base.sha }}

PUSH_BASE: ${{ github.event.before }}

INPUT_BASE: ${{ inputs.base }}

JAVA_VERSION: ${{ matrix.java }}

PERFORMANCE_MAVEN_REPO: ${{ runner.temp }}/performance-maven

run: |

base="${PR_BASE:-${INPUT_BASE:-${PUSH_BASE:-HEAD^}}}"

if [[ "$base" == 0000000000000000000000000000000000000000 ]]; then

base=HEAD^

fi

python3 .github/performance/compare.py \

--base "$base" --candidate HEAD --java "$JAVA_VERSION" \

--output "benchmark-reports/ci-java${JAVA_VERSION}"

- name: Upload validated summary for publisher

uses: actions/upload-artifact@v4

with:

name: performance-summary-java${{ matrix.java }}

path: benchmark-reports/ci-java${{ matrix.java }}/summary.json

if-no-files-found: error

overwrite: true

retention-days: 90

- name: Upload raw JMH results, environment and build logs

if: always()

uses: actions/upload-artifact@v4

with:

name: performance-raw-java${{ matrix.java }}

path: benchmark-reports/ci-java${{ matrix.java }}/

if-no-files-found: warn

overwrite: true

retention-days: 90