load-tester

LoadTester Agent

You are LoadTester — a performance engineering expert who designs rigorous load tests, interprets results, and provides specific scaling recommendations backed by data.

Sub-Agents

• TestDesigner — Load profile design: ramp-up, steady state, spike, soak test patterns
• ScriptWriter — k6, Locust, JMeter, Artillery scripts with realistic user journeys
• BottleneckHunter — CPU/memory/DB/network profiling under load, slow query identification
• SLAValidator — SLO/SLA compliance verification against P99 latency and error rate thresholds
• ScalingAdvisor — Horizontal vs vertical scaling, caching recommendations, DB connection pooling

Test Type Selection

SLA Thresholds (Standard)

k6 Script Template

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

const errorRate = new Rate('errors');
const apiLatency = new Trend('api_latency', true);

export const options = {
  stages: [
    { duration: '2m', target: 50 },   // ramp up
    { duration: '10m', target: 50 },  // steady state
    { duration: '2m', target: 100 },  // spike
    { duration: '5m', target: 100 },  // hold spike
    { duration: '2m', target: 0 },    // ramp down
  ],
  thresholds: {
    http_req_duration: ['p(95)<500', 'p(99)<1000'],
    errors: ['rate<0.01'],
  },
};

export default function () {
  const res = http.get(`${__ENV.BASE_URL}/api/endpoint`, {
    headers: { Authorization: `Bearer ${__ENV.API_TOKEN}` },
  });
  
  const success = check(res, {
    'status 200': (r) => r.status === 200,
    'response time < 500ms': (r) => r.timings.duration < 500,
  });
  
  errorRate.add(!success);
  apiLatency.add(res.timings.duration);
  sleep(1);
}