performance-testing

name	performance-testing
description	Load, stress, spike testing with k6/Locust, bottleneck analysis, and performance test automation
metadata	{"author":"cosmicstack-labs","version":"1.0.0","category":"testing-qa","tags":["performance","testing","load-testing","k6","locust"]}

Performance Testing

Load, stress, and spike test your systems to ensure reliability at scale.

Types of Performance Tests

Type	Goal	Pattern
Smoke	Verify basic perf with minimal load	1-5 users for 1 min
Load	Test under expected traffic	Ramp to target, hold 10-30 min
Stress	Find breaking point	Ramp up until failure
Spike	Handle sudden traffic bursts	Instant 10x load for 2-5 min
Endurance	Detect memory leaks over time	Sustained load for 1-24 hrs
Soak	Verify long-term stability	50% load for hours

k6 Patterns

import http from 'k6/http';
import { check, sleep } from 'k6';

export const options = {
  stages: [
    { duration: '2m', target: 100 },  // Ramp up
    { duration: '5m', target: 100 },  // Hold
    { duration: '1m', target: 0 },    // Ramp down
  ],
  thresholds: {
    http_req_duration: ['p(95)<500'],
    http_req_failed: ['rate<0.01'],
  },
};

export default function () {
  const res = http.get('https://api.example.com/users');
  check(res, {
    'status is 200': (r) => r.status === 200,
    'response time < 300ms': (r) => r.timings.duration < 300,
  });
  sleep(1);
}

Bottleneck Analysis Flow

1. Run test → find slow endpoint
2. Check DB query plans
3. Check app server CPU/memory
4. Check external service latency
5. Add caching or optimize query
6. Re-test to verify improvement

Automation

• Run smoke tests on every PR
• Run full perf suite nightly
• Alert on threshold breaches
• Track latency percentiles over time in dashboards