I try to create a script, where each user sends a request with a fake first name in the body. For this activity, I used a faker. In my script are 2 vus, which send requests, but each request has the same name, which was generated using faker. Which elements I should fix when I want to send a different name on each request, not the same?
My script with a test case:
Hi @Mada
I was testing and example based on GitHub - grafana/k6-example-data-generation: Example repository showing how to utilise k6 and faker to load test using generated data, and what I find is that each VU iteration the faker data changes for me:
import { sleep } from 'k6';
import http from 'k6/http';
import { Rate } from 'k6/metrics';
import { vu } from 'k6/execution';
import faker from 'https://cdnjs.cloudflare.com/ajax/libs/Faker/3.1.0/faker.min.js'
export const options = {
discardResponseBodies: true,
scenarios: {
form: {
executor: 'per-vu-iterations',
vus: 2,
iterations: 30,
maxDuration: '100s',
},
},
thresholds: {
'failed form submits': ['rate<0.1'],
'failed form fetches': ['rate<0.1'],
'http_req_duration': ['p(95)<400']
}
};
export const generateSubscriber = () => ({
name: `${faker.name.firstName()} ${faker.name.lastName()}`,
title: faker.name.jobTitle(),
company: faker.company.companyName(),
email: faker.internet.email(),
country: faker.address.country()
});
const baseUrl = 'https://httpbin.test.k6.io/anything';
const urls = {
form: `${baseUrl}/form`,
submit: `${baseUrl}/form/subscribe`,
};
const formFailRate = new Rate('failed form fetches');
const submitFailRate = new Rate('failed form submits');
const getForm = () => {
const formResult = http.get(urls.form);
formFailRate.add(formResult.status !== 200);
}
const submitForm = () => {
const person = generateSubscriber();
console.log('vu: ', vu.idInTest, 'iteration: ', vu.iterationInScenario, 'person.name: ', person.name);
const payload = JSON.stringify(person);
const submitResult = http.post(urls.submit, payload);
submitFailRate.add(submitResult.status !== 200);
}
export default function () {
getForm();
submitForm();
sleep(1);
}
The output:
/\ |‾‾| /‾‾/ /‾‾/
/\ / \ | |/ / / /
/ \/ \ | ( / ‾‾\
/ \ | |\ \ | (‾) |
/ __________ \ |__| \__\ \_____/ .io
execution: local
script: test.js
output: -
scenarios: (100.00%) 1 scenario, 2 max VUs, 2m10s max duration (incl. graceful stop):
* form: 30 iterations for each of 2 VUs (maxDuration: 1m40s, gracefulStop: 30s)
INFO[0000] vu: 2 iteration: 0 person.name: Georgette Cole source=console
INFO[0000] vu: 1 iteration: 0 person.name: Georgette Cole source=console
INFO[0002] vu: 2 iteration: 1 person.name: Rory Reichel source=console
INFO[0002] vu: 1 iteration: 1 person.name: Rory Reichel source=console
INFO[0003] vu: 2 iteration: 2 person.name: Raymond Parker source=console
INFO[0003] vu: 1 iteration: 2 person.name: Raymond Parker source=console
INFO[0004] vu: 2 iteration: 3 person.name: Palma Mills source=console
INFO[0004] vu: 1 iteration: 3 person.name: Palma Mills source=console
INFO[0005] vu: 2 iteration: 4 person.name: Henry Koelpin source=console
INFO[0005] vu: 1 iteration: 4 person.name: Henry Koelpin source=console
INFO[0006] vu: 2 iteration: 5 person.name: Lauretta Schulist source=console
INFO[0006] vu: 1 iteration: 5 person.name: Lauretta Schulist source=console
INFO[0008] vu: 2 iteration: 6 person.name: Russ Carter source=console
INFO[0008] vu: 1 iteration: 6 person.name: Russ Carter source=console
INFO[0009] vu: 2 iteration: 7 person.name: Brenna Gislason source=console
INFO[0009] vu: 1 iteration: 7 person.name: Brenna Gislason source=console
INFO[0010] vu: 2 iteration: 8 person.name: Eulah Stark source=console
INFO[0010] vu: 1 iteration: 8 person.name: Eulah Stark source=console
INFO[0011] vu: 1 iteration: 9 person.name: Maxie Bartoletti source=console
INFO[0011] vu: 2 iteration: 9 person.name: Maxie Bartoletti source=console
INFO[0013] vu: 2 iteration: 10 person.name: Foster Stroman source=console
INFO[0013] vu: 1 iteration: 10 person.name: Foster Stroman source=console
INFO[0014] vu: 2 iteration: 11 person.name: Jerel Howe source=console
INFO[0014] vu: 1 iteration: 11 person.name: Jerel Howe source=console
INFO[0015] vu: 2 iteration: 12 person.name: Noah Christiansen source=console
INFO[0015] vu: 1 iteration: 12 person.name: Noah Christiansen source=console
INFO[0016] vu: 2 iteration: 13 person.name: Drake Ankunding source=console
INFO[0016] vu: 1 iteration: 13 person.name: Drake Ankunding source=console
INFO[0018] vu: 2 iteration: 14 person.name: Furman Boyer source=console
INFO[0018] vu: 1 iteration: 14 person.name: Furman Boyer source=console
INFO[0019] vu: 2 iteration: 15 person.name: Darien Murphy source=console
INFO[0019] vu: 1 iteration: 15 person.name: Darien Murphy source=console
INFO[0020] vu: 2 iteration: 16 person.name: Kristina Hyatt source=console
INFO[0020] vu: 1 iteration: 16 person.name: Kristina Hyatt source=console
INFO[0021] vu: 2 iteration: 17 person.name: Dimitri Krajcik source=console
INFO[0021] vu: 1 iteration: 17 person.name: Dimitri Krajcik source=console
INFO[0022] vu: 2 iteration: 18 person.name: Else Leffler source=console
INFO[0022] vu: 1 iteration: 18 person.name: Else Leffler source=console
INFO[0024] vu: 2 iteration: 19 person.name: Isaac Leuschke source=console
INFO[0024] vu: 1 iteration: 19 person.name: Isaac Leuschke source=console
INFO[0025] vu: 2 iteration: 20 person.name: Ashlee Bradtke source=console
INFO[0025] vu: 1 iteration: 20 person.name: Ashlee Bradtke source=console
INFO[0026] vu: 2 iteration: 21 person.name: Keenan Weber source=console
INFO[0026] vu: 1 iteration: 21 person.name: Keenan Weber source=console
INFO[0027] vu: 1 iteration: 22 person.name: Norris Mraz source=console
INFO[0027] vu: 2 iteration: 22 person.name: Norris Mraz source=console
INFO[0029] vu: 2 iteration: 23 person.name: Torrey Moore source=console
INFO[0029] vu: 1 iteration: 23 person.name: Torrey Moore source=console
INFO[0030] vu: 2 iteration: 24 person.name: Lucas Schuppe source=console
INFO[0030] vu: 1 iteration: 24 person.name: Lucas Schuppe source=console
INFO[0031] vu: 2 iteration: 25 person.name: Verna Heathcote source=console
INFO[0031] vu: 1 iteration: 25 person.name: Verna Heathcote source=console
INFO[0032] vu: 2 iteration: 26 person.name: Damaris Jacobi source=console
INFO[0032] vu: 1 iteration: 26 person.name: Damaris Jacobi source=console
INFO[0033] vu: 2 iteration: 27 person.name: Keyon Wehner source=console
INFO[0033] vu: 1 iteration: 27 person.name: Keyon Wehner source=console
INFO[0035] vu: 2 iteration: 28 person.name: Thalia Cormier source=console
INFO[0035] vu: 1 iteration: 28 person.name: Thalia Cormier source=console
INFO[0036] vu: 2 iteration: 29 person.name: Chadd Nader source=console
INFO[0036] vu: 1 iteration: 29 person.name: Chadd Nader source=console
running (0m37.0s), 0/2 VUs, 60 complete and 0 interrupted iterations
form ✓ [======================================] 2 VUs 0m37.0s/1m40s 60/60 iters, 30 per VU
data_received..................: 105 kB 2.8 kB/s
data_sent......................: 26 kB 704 B/s
✓ failed form fetches............: 0.00% ✓ 0 ✗ 60
✓ failed form submits............: 0.00% ✓ 0 ✗ 60
http_req_blocked...............: avg=3.72ms min=2µs med=7µs max=224.96ms p(90)=16.1µs p(95)=18µs
http_req_connecting............: avg=1.77ms min=0s med=0s max=107.73ms p(90)=0s p(95)=0s
✓ http_req_duration..............: avg=112.05ms min=106.66ms med=109.68ms max=141.92ms p(90)=117.96ms p(95)=129.6ms
{ expected_response:true }...: avg=112.05ms min=106.66ms med=109.68ms max=141.92ms p(90)=117.96ms p(95)=129.6ms
http_req_failed................: 0.00% ✓ 0 ✗ 120
http_req_receiving.............: avg=89.82µs min=19µs med=76.5µs max=301µs p(90)=152.19µs p(95)=171.74µs
http_req_sending...............: avg=34.21µs min=7µs med=32µs max=103µs p(90)=55µs p(95)=60µs
http_req_tls_handshaking.......: avg=1.91ms min=0s med=0s max=115.83ms p(90)=0s p(95)=0s
http_req_waiting...............: avg=111.93ms min=106.54ms med=109.55ms max=141.8ms p(90)=117.77ms p(95)=129.52ms
http_reqs......................: 120 3.239677/s
iteration_duration.............: avg=1.23s min=1.21s med=1.22s max=1.47s p(90)=1.24s p(95)=1.25s
iterations.....................: 60 1.619838/s
vus............................: 2 min=2 max=2
vus_max........................: 2 min=2 max=2
I do not use your local faker, is it based on https://cdnjs.cloudflare.com/ajax/libs/Faker/3.1.0/faker.min.js as well? I also don’t have the fakeData.js you are importing. If you can share more details on those we can have a look.
Let me know if my example works on your side as well.
I hope this helps.
Cheers!
Ok, thx for your help. But VU 1 and VU 2 have the same person name. How to achieve the result that each user on each interaction has the different name?
Hi @Mada
If you need to change the values each VU is taking you might try initializing faker with a different seed. Similar to:
import { sleep } from 'k6';
import http from 'k6/http';
import { Rate } from 'k6/metrics';
import faker from 'https://cdnjs.cloudflare.com/ajax/libs/Faker/3.1.0/faker.min.js'
import { vu } from 'k6/execution';
import { randomIntBetween } from 'https://jslib.k6.io/k6-utils/1.2.0/index.js';
export const options = {
discardResponseBodies: true,
scenarios: {
form: {
executor: 'per-vu-iterations',
vus: 2,
iterations: 30,
maxDuration: '100s',
},
},
thresholds: {
'failed form submits': ['rate<0.1'],
'failed form fetches': ['rate<0.1'],
'http_req_duration': ['p(95)<400']
}
};
export const generateSubscriber = () => ({
name: `${faker.name.firstName()} ${faker.name.lastName()}`,
title: faker.name.jobTitle(),
company: faker.company.companyName(),
email: faker.internet.email(),
country: faker.address.country()
});
const baseUrl = 'https://httpbin.test.k6.io/anything';
const urls = {
form: `${baseUrl}/form`,
submit: `${baseUrl}/form/subscribe`,
};
const formFailRate = new Rate('failed form fetches');
const submitFailRate = new Rate('failed form submits');
const getForm = () => {
const formResult = http.get(urls.form);
formFailRate.add(formResult.status !== 200);
}
const submitForm = () => {
const person = generateSubscriber();
console.log('vu: ', vu.idInTest, 'iteration: ', vu.iterationInScenario, 'person.name: ', person.name);
const payload = JSON.stringify(person);
const submitResult = http.post(urls.submit, payload);
submitFailRate.add(submitResult.status !== 200);
}
export default function () {
faker.seed(randomIntBetween(1, 1000));
getForm();
submitForm();
sleep(1);
}
Then I get:
scenarios: (100.00%) 1 scenario, 2 max VUs, 2m10s max duration (incl. graceful stop):
* form: 10 iterations for each of 2 VUs (maxDuration: 1m40s, gracefulStop: 30s)
INFO[0001] vu: 2 iteration: 0 person.name: Kyler Boyer source=console
INFO[0001] vu: 1 iteration: 0 person.name: Monserrat Bogisich source=console
INFO[0002] vu: 2 iteration: 1 person.name: Garrett Mayer source=console
INFO[0002] vu: 1 iteration: 1 person.name: Freda Farrell source=console
INFO[0003] vu: 1 iteration: 2 person.name: Diana Funk source=console
INFO[0003] vu: 2 iteration: 2 person.name: Leopoldo Cartwright source=console
INFO[0005] vu: 1 iteration: 3 person.name: Elise Ryan source=console
INFO[0005] vu: 2 iteration: 3 person.name: Carissa Daniel source=console
INFO[0006] vu: 2 iteration: 4 person.name: Damien Connelly source=console
INFO[0006] vu: 1 iteration: 4 person.name: Jamaal Hayes source=console
...
I hope this helps.
Cheers!
thank you very much 