LoaderIO

LoaderIO module provides Drupal users a way to test their website for performance.
This module, having an insight into your Drupal installation, generates an insight about your site using Loader.IO API

Sample API:

curl -X POST
-H 'loaderio-auth: API_KEY'
-H 'Content-Type: application/json'
--data-binary '{"test_type":"cycling", "total": 6000, "duration":60, "urls": [ {"url": "http://mysite.com"} ]}'
https://api.loader.io/v2/tests

For anonymous users you are allowed to:
- Specify the maximum amount of concurrent anonymous users that will be simulated in the load test. You can further specify the list of pages, each anonymous user will access one after the other.

For authenticated users you are allowed to specify:
- Number of concurrent authenticated users that will be simulated in the load test and the list of pages they will access.
- Number of unique authenticated users.
- Number of users in the site with credentials that will be used for the load test.