Ramping VUs

Description

A variable number of VUs execute as many iterations as possible for a specified amount of time. This executor is equivalent to the global stages option.

Options

In addition to the common configuration options this executor also adds the following options:

When to use

This executor is a good fit if you need VUs to ramp up or down during specific periods of time.

Example

In this example, we'll run a two-stage test, ramping up from 0 to 100 VUs for 5 seconds, and down to 0 VUs over 5 seconds.

1import http from 'k6/http';
2
3export let options = {
4  discardResponseBodies: true,
5  scenarios: {
6    contacts: {
7      executor: 'ramping-vus',
8      startVUs: 0,
9      stages: [
10        { duration: '5s', target: 100 },
11        { duration: '5s', target: 0 },
12      ],
13      gracefulRampDown: '0s',
14    },
15  },
16};
17
18export default function () {
19  http.get('https://test.k6.io/contacts.php');
20}

Note the setting of gracefulRampDown to 0 seconds, which could cause some iterations to be interrupted during the ramp down stage.