All metrics are updated at a predefined interval of three seconds. This includes CPU usage, memory and swap utilization, running processes, and their respective resource consumption, and so on. The top command shows a summarized view of various resource utilization metrics. Let's start with the most commonly used monitoring command that is top command. You may need sudo privileges to execute some commands. We will look at some common tools used to get CPU usage details. In this recipe, we will focus on tracking CPU performance. Most of the time, you will find higher CPU use, but in reality, the CPU is waiting for data to become available.
Tracking exact CPU usage is quite a confusing task. Generally, the CPU spends a big part of processing time waiting for synchronous IO to fetch data from the disk or from a network device. The processing power is still far ahead of the data transfer speeds of I/O devices and networks.
Modern CPUs generally do not become bottlenecks for performance.
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