System Load Average on Netdata

Linux Load Average Spikes: IO Wait & Bottlenecks

Tue, 19 Aug 2025 00:00:00 +0000

An alert fires: “High load average on production server.” Your heart rate quickens. You SSH into the machine and run a command like top, only to be confused. The CPU usage is hovering at 10%, but the load average is sky-high. What’s going on? If the CPU isn’t busy, what is the system “loaded” with? This common scenario highlights one of the most misunderstood metrics in Linux performance troubleshooting: the system load average.

Linux Load Average Myths and Realities

Sun, 03 Nov 2024 00:00:00 +0000

When it comes to monitoring system performance on Linux, the load average is one of the most referenced metrics. Displayed prominently in tools like top, uptime, and htop, it’s often used as a quick gauge of system load and capacity. But how reliable is it? For complex, multi-threaded applications, load average can paint a misleading picture of actual system performance.

In this article, we’ll dive into the myths and realities of Linux load average, using insights from Netdata’s high-frequency, high-concurrency monitoring setup. Through this journey, we’ll uncover why load average spikes can occur even under steady workloads, and why a single metric is rarely enough to capture the true state of a system. Whether you’re a system administrator, developer, or performance enthusiast, this exploration of load average will help you interpret it more accurately and understand when it may—or may not—reflect reality.

Linux CPU Consumption, Load & Pressure Explained

Tue, 02 May 2023 00:00:00 +0000

As a system administrator, understanding how your Linux system’s CPU is being utilized is crucial for identifying bottlenecks and optimizing performance. In this blog post, we’ll dive deep into the world of Linux CPU consumption, load, and pressure, and discuss how to use these metrics effectively to identify issues and improve your system’s performance.

CPU Consumption and Utilization

CPU consumption refers to the amount of processing power being used by applications running on your system. The system.cpu chart in Netdata represents the Total CPU utilization of your Linux system, broken down into different dimensions. Each dimension provides insight into how the CPU is being used by various tasks and processes. Here’s a brief explanation of each dimension:

How to find out which application is causing server load

Wed, 26 Oct 2022 00:00:00 +0000

We often hear the term load used to describe the state of a server or a device, but we’re here to tell you what it means, precisely, and how to monitor it.

What is server load?

We often hear the term “load” used to describe the state of a server or a device. But what does it really mean?

System load is a measure of the amount of computational work that a system performs. An overloaded system, by definition, isn’t able to complete all its tasks per schedule - this affects the performance and productivity of the system. And while “load” often gets conflated with CPU usage there’s a lot more to it.