Is it possible to distribute data based on percentages in K6?
For instance, can you demonstrate how to do this using a .csv file?
Is it possible to distribute data based on percentages in K6?
For instance, can you demonstrate how to do this using a .csv file?
There are two potential solutions that come to mind for addressing this issue:
--execution-segment featureThe k6 tool offers the capability to divide your test run into segments by running multiple k6 instances concurrently.
import papaparse from 'https://jslib.k6.io/papaparse/5.1.1/index.js';
import { SharedArray } from 'k6/data';
const csvData = new SharedArray('csv', function () {
return papaparse.parse(open(__ENV.datafile), { header: true }).data;
});
export default function () {
// utilize csvData[...]
}
To execute, launch 3 tests in parallel (on distinct hosts or as background tasks) and specify the data file path for each one:
$ k6 run -e datafile=data_set_01.csv --execution-segment '50%' loadtest.js &
$ k6 run -e datafile=data_set_02.csv --execution-segment '30%' loadtest.js &
$ k6 run -e datafile=data_set_03.csv --execution-segment '20%' loadtest.js &
References:
Load all three files into memory and then use a random variable to determine which file to access. While this method may not offer perfect distribution, it only requires initiating a single k6 process.
import papaparse from 'https://jslib.k6.io/papaparse/5.1.1/index.js';
import { SharedArray } from 'k6/data';
const csvData = new SharedArray('csv', function () {
return [
'data_set_01.csv',
'data_set_02.csv',
'data_set_03.csv',
].map(file => papaparse.parse(open(file), { header: true }).data);
});
function rnd() {
const x = Math.random();
if (x < 0.5) return 0;
if (x < 0.8) return 1;
return 2;
}
function selectRandomCsv() {
return csvData[rnd()];
}
export default function () {
// utilize selectRandomCsv()[...]
}
No additional precautions are necessary when executing this method:
$ k6 run loadtest.js
References:
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