Performance Test

Goals theo strategy

• Confirm SLA met (p95 latency < 500ms).
• Identify bottleneck.
• Validate scaling.
• Pre-launch confidence.

Tools comparison

Test script ví dụ k6

import http from 'k6/http';
import { check, sleep } from 'k6';
export const options = {
  stages: [
    { duration: '30s', target: 100 },
    { duration: '2m', target: 100 },
    { duration: '30s', target: 0 },
  ],
};
export default function () {
  const res = http.get('https://api.vietnamcos.com/courses');
  check(res, { 'status 200': (r) => r.status === 200 });
  sleep(1);
}

Metrics track

• Response time (avg, p50, p90, p95, p99).
• Throughput (RPS).
• Error rate.
• CPU, memory, disk, network on server.

Common bottleneck

• DB query slow (missing index).
• N+1 query.
• External API blocking call.
• Memory leak under load.
• Connection pool exhausted.

VN benchmark

• E-com normal: 500-5000 RPS.
• Tết spike: 10× normal.
• Banking: 100-1000 TPS, p99 < 1s.

Setup

• Isolated env, not staging shared.
• Production-like resource (or scaled-down with multiplier).
• Realistic data volume (1M+ records, not 100).