Introduction

Generate CPU load for one or more cores

Usage

The resources on a host are shared between containers. Running a resource attack for a container is executed in the containers cgroup, but affects the host's resources and all containers running on it.

Use Cases

• Test your application's resilience to high CPU load

Parameters

Parameter	Description	Default
CPU Load	How many CPU should be consumed?	100
Container CPUs	How many workers should be used to stress the CPU?	All Cores
Duration	How long should CPU be consumed?	30s

Frequently Asked Questions (FAQs)

Q: My container has a limit of 500m, set the attack to 100% load but only observe 35-45% CPU usage. Why?

A: stress-ng under the hood generates the load and tries to meet the targeted load, but the Kernel scheduler may assign fewer CPU time slots to the process, resulting in lower CPU usage than desired. For target containers with a higher limit, the desired CPU load is more likely to be met.