Issue #14599: Create performance regression test CI

.ci/check-performance-regression.sh

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+#!/bin/bash
+
+set -e
+
+# max difference tolerance in %
+THRESHOLD_PERCENTAGE=10
+# baseline of execution time in seconds
+BASELINE_SECONDS=415.72
+
+# sample project path
+SAMPLE_PROJECT="./.ci-temp/jdk17"
+CONFIG_FILE="./config/benchmark-config.xml"
+
+# execute a command and time it
+# $TEST_COMMAND: command being timed
+time_command() {
+  # execute the command and time it
+  /usr/bin/time -o time.temp -q -f "%e" "$@" &>result.tmp
+
+  cat time.temp
+}
+
+# execute the benchmark a few times to calculate the average metrics
+# $JAR_PATH: path of the jar file being benchmarked
+execute_benchmark() {
+  local JAR_PATH=$1
+  if [ -z "$JAR_PATH" ]; then
+      echo "Missing JAR_PATH as an argument."
+      exit 1
+  fi
+
+  local TOTAL_SECONDS=0
+  local NUM_EXECUTIONS=3
+
+  [ ! -d "$SAMPLE_PROJECT" ] &&
+    echo "Directory $SAMPLE_PROJECT DOES NOT exist." | exit 1
+
+  # add suppressions to config file
+  sed -i '/  <!-- Filters -->/r ./config/projects-to-test/openjdk17-excluded.files' \
+        ./config/benchmark-config.xml
+
+  for ((i = 0; i < NUM_EXECUTIONS; i++)); do
+    local CMD=(java -jar "$JAR_PATH" -c "$CONFIG_FILE" \
+      -x .git -x module-info.java "$SAMPLE_PROJECT")
+    local BENCHMARK=($(time_command "${CMD[@]}"))
+    TOTAL_SECONDS=$(echo "$TOTAL_SECONDS + $BENCHMARK" | bc)
+  done
+
+  # average execution time in patch
+  local AVERAGE_IN_SECONDS=$(echo "scale=2; $TOTAL_SECONDS / $NUM_EXECUTIONS" | bc)
+  echo "$AVERAGE_IN_SECONDS"
+}
+
+# compare baseline and patch benchmarks
+# $EXECUTION_TIME_SECONDS execution time of the patch
+compare_results() {
+  local EXECUTION_TIME_SECONDS=$1
+  if [ -z "$EXECUTION_TIME_SECONDS" ]; then
+        echo "Missing EXECUTION_TIME_SECONDS as an argument."
+        exit 1
+    fi
+  # Calculate percentage difference for execution time
+  local DEVIATION_IN_SECONDS=$(echo "scale=4; \
+    ((${EXECUTION_TIME_SECONDS} - ${BASELINE_SECONDS}) / ${BASELINE_SECONDS}) * 100" | bc)
+  echo "Execution Time Difference: $DEVIATION_IN_SECONDS%"
+
+  # Check if differences exceed the maximum allowed difference
+  if (( $(echo "$DEVIATION_IN_SECONDS > $THRESHOLD_PERCENTAGE" | bc -l) )); then
+    echo "Difference exceeds the maximum allowed difference (${DEVIATION_IN_SECONDS}% \
+     > ${THRESHOLD_PERCENTAGE}%)!"
+    exit 1
+  else
+    echo "Difference is within the maximum allowed difference (${DEVIATION_IN_SECONDS}% \
+     <= ${THRESHOLD_PERCENTAGE}%)."
+    exit 0
+  fi
+}
+
+# package patch
+mvn -e --no-transfer-progress -Passembly,no-validations package
+
+# start benchmark
+echo "Benchmark launching..."
+AVERAGE_IN_SECONDS="$(execute_benchmark "$(find "./target/" -type f -name "checkstyle-*-all.jar")")"
+
+# print the command execution result
+echo "================ MOST RECENT COMMAND RESULT ================="
+cat result.tmp
+
+echo "===================== BENCHMARK SUMMARY ===================="
+echo "Execution Time Baseline: ${BASELINE_SECONDS} s"
+echo "Average Execution Time: ${AVERAGE_IN_SECONDS} s"
+echo "============================================================"
+
+# compare result with baseline
+compare_results "$AVERAGE_IN_SECONDS"
+
+exit $?

.github/workflows/check-performance-regression.yml

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+#####################################################################################
+# GitHub Action to test performance regression.
+#
+# Workflow starts when:
+# 1) push to master
+# 2) PR created or pushed
+#
+#####################################################################################
+name: Check-Performance-Regression
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches: '*'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up JDK 11
+        uses: actions/setup-java@v4
+        with:
+          java-version: 11
+          distribution: 'temurin'
+
+      - name: Checkout patch
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
+          path: ./checkstyle
+
+      - name: Clone JDK 17 Repo
+        uses: actions/checkout@v4
+        with:
+          repository: openjdk/jdk17
+          path: ./checkstyle/.ci-temp/jdk17
+
+      - name: Setup local maven cache
+        uses: actions/cache@v4
+        with:
+          path: ~/.m2/repository
+          key: checkstyle-maven-cache-${{ hashFiles('**/pom.xml') }}
+
+      - name: Run performance test
+        run: |
+          cd checkstyle
+          bash ./.ci/check-performance-regression.sh