How to Limit CPU and RAM Usage in Linux: A Guide to cpulimit, cgroups, systemd, and ulimit
By
Ravi Saive
Pure flour-power. Hearty enough to carry you through lunch.
Summary
This article provides a practical guide for Linux users and system administrators on how to prevent and control high CPU and RAM usage by processes. It covers four main methods: cpulimit (for limiting CPU usage of a single process), cgroups (for resource management at the group level), systemd (for service-level resource limits), and ulimit (for user-level shell limits). The guide includes real-world examples and use cases such as backup jobs, software builds, and misbehaving applications, emphasizing proactive resource management over simply killing processes.
Key quotes
· 3 pulledA process suddenly consuming 99% of your CPU at 2 AM can turn a stable server into a slow, unresponsive mess.
The good news is that Linux gives you several ways to prevent this from happening before it becomes a problem.
In many cases, killing the process isn't the best solution. You may simply want to limit how much CPU or memory it can use so the rest of the system continues running normally.
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