k6 Performance Test Script - Example

(1) script.js

import { sleep, group, check } from "k6";
import http from "k6/http";

export let options = {
  thresholds: {
    // 95% of requests must finish within 500 ms & 99% within 1500 ms
    http_req_duration: ['p(95) < 500', 'p(99) < 1500'],
  },
};

export default function performanceTest() {
  group("GET: Home Page", function () {
    let res = http.get("https://nakov-mvc-node-app.herokuapp.com/");
	check(res, { 'HTTP status == 200': (r) => r.status == 200 });
    sleep(2);
  });

  group("GET: Students Page", function () {
    let res = http.get("https://nakov-mvc-node-app.herokuapp.com/students");
	check(res, { 'HTTP status == 200': (r) => r.status == 200 });
    sleep(3);
  });

  group("GET, POST: Add Students Page", function () {
    let res = http.get("https://nakov-mvc-node-app.herokuapp.com/add-student");
	check(res, { 'HTTP status == 200': (r) => r.status == 200 });
    sleep(3);
    let uniqueNum = new Date().getTime();
    let body = { name: "New" + uniqueNum, email: uniqueNum + "@gmail.com" };
    http.post("https://nakov-mvc-node-app.herokuapp.com/add-student", body);
    sleep(2);
  });
}

(2) Run the script

k6 --vus 5000 --duration 20s run script.js

(3) Sample output from the script

          /\      |‾‾| /‾‾/   /‾‾/
     /\  /  \     |  |/  /   /  /
    /  \/    \    |     (   /   ‾‾\
   /          \   |  |\  \ |  (‾)  |
  / __________ \  |__| \__\ \_____/ .io

  execution: local
     script: script.js
     output: -

  scenarios: (100.00%) 1 scenario, 500 max VUs, 50s max duration (incl. graceful stop):
           * default: 500 looping VUs for 20s (gracefulStop: 30s)


running (53.0s), 0000/5000 VUs, 378 complete and 4627 interrupted iterations
default ✓ [======================================] 5000 VUs  20s

     █ GET: Home Page

       ✗ HTTP status == 200
        ↳  99% — ✓ 3197 / ✗ 15

     █ GET: Students Page

       ✓ HTTP status == 200

     █ GET, POST: Add Students Page

       ✓ HTTP status == 200

     checks.....................: 99.75% ✓ 6101   ✗ 15
     data_received..............: 200 MB 3.8 MB/s
     data_sent..................: 3.8 MB 71 kB/s
     group_duration.............: avg=15.57s   min=2.21s med=13.44s   max=50.46s   p(90)=29.23s  p(95)=35.13s
     http_req_blocked...........: avg=4.43s    min=0s    med=0s       max=49.38s   p(90)=14.31s  p(95)=23.35s
     http_req_connecting........: avg=694.59ms min=0s    med=0s       max=16.57s   p(90)=1.64s   p(95)=3.37s
   ✗ http_req_duration..........: avg=5.17s    min=0s    med=818.95ms max=44.85s   p(90)=17.79s  p(95)=25.37s
     http_req_receiving.........: avg=2.48s    min=0s    med=0s       max=42.59s   p(90)=9.7s    p(95)=15s
     http_req_sending...........: avg=472.64µs min=0s    med=0s       max=124.99ms p(90)=993.7µs p(95)=1ms
     http_req_tls_handshaking...: avg=3.72s    min=0s    med=0s       max=48.22s   p(90)=11.05s  p(95)=22.27s
     http_req_waiting...........: avg=2.68s    min=0s    med=742.99ms max=43.39s   p(90)=7.78s   p(95)=13.14s
     http_reqs..................: 7781   146.818418/s
     iteration_duration.........: avg=40.58s   min=16s   med=41.88s   max=50.98s   p(90)=48.24s  p(95)=48.99s
     iterations.................: 389    7.339977/s
     vus........................: 0      min=0    max=5000
     vus_max....................: 5000   min=5000 max=5000

ERRO[0103] some thresholds have failed