[C/C++ Utility Tools] Comparison of CPU Usage Monitoring Tools

Directory title

  • Comparison of CPU usage monitoring tools
    • Tool function comparison table
    • pidstat
      • Functions and features
        • code example
      • deep insights
    • vmstat
      • Functions and features
        • code example
      • deep insights
    • mpstat
      • Functions and features
        • code example
      • deep insights
    • top
      • Functions and features
        • code example
      • deep insights
    • sar
      • Functions and features
        • code example
      • deep insights
    • htop
      • Functions and features
        • code example
      • deep insights
    • Summary
  • Conclusion

Comparison of CPU usage monitoring tools

In Linux systems, there are a variety of tools that can be used to monitor CPU usage. Each of these tools has advantages and disadvantages and is suitable for different scenarios and needs. This article will compare the following commonly used CPU usage monitoring tools: pidstat, vmstat, mpstat, top, sar and htop.

Tool function comparison table

Tools Real-time monitoring Historical data Multi-core support Process-level monitoring Memory information Interface
pidstat ? ? ? ? ? Text
vmstat ? ? ? ? ? Text
mpstat ? ? ? ? ? Text
top ? ? ? ? ? Text
sar ? ? ? ? ? Text
htop ? ? ? ? ? Graphics

pidstat

Functions and features

pidstat is a tool for monitoring process-level CPU usage. It supports real-time monitoring but does not provide historical data. Additionally, it supports multi-core CPUs.

Code example
pidstat 1

This will update the CPU usage of the process every second.

In-depth insights

As Bjarne Stroustrup said in “The C++ Programming Language”: “A program must do the right thing, but it must also do it right.” 1 pidstat is a tool that does things right. It focuses on process-level monitoring, allowing you to accurately understand which process is the main consumer of CPU.

vmstat

Functions and features

vmstat is mainly used to display system status information including CPU. It provides real-time monitoring but does not support multi-core and process-level monitoring.

Code example
vmstat 1

This will update the system status every second.

In-depth insights

vmstat is a comprehensive tool that not only focuses on the CPU, but also other system resources. This gives you a high-level view of the overall performance of your system.

mpstat

Functions and features

mpstat is a tool for multiprocessor usage monitoring. It supports real-time monitoring and multi-core CPUs, but does not provide process-level monitoring.

Code example
mpstat -P ALL 1

This will update the usage of all CPU cores every second.

In-depth insights

In multi-core systems, it is very important to understand the usage of each core. mpstat is like a granular observer, giving you insight into the performance of each core.

top

Functions and features

top is a very popular real-time system status monitor. It supports real-time monitoring, multi-core CPU and process-level monitoring.

Code example
top

This will open a live updated system status interface.

In-depth insights

top is an all-round tool that provides rich information and flexible operations, allowing you to fully understand the system status.

sar

Functions and features

sar is a system activity reporting tool that can provide a large amount of historical data.

Code example
sar -u 1 3

This will show the CPU usage for the last 3 seconds.

In-depth insights

Historical data is extremely valuable and can help us understand how the system has performed in the past for better planning and optimization.

htop

Functions and features

htop is an enhanced version of top, providing more functions and a friendlier interface.

Code example
htop

This will open a graphical interface showing the system status in real time.

In-depth insights

htop is like an advanced monitoring dashboard. It not only provides rich information, but also has an intuitive graphical interface, allowing you to understand the system status more easily.

Summary

Each tool has its own unique uses and benefits, and which one you choose depends on your specific needs and scenario. Hopefully this article will help you make a more informed choice.

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Conclusion

In our programming learning journey, understanding is an important step for us to move to a higher level. However, mastering new skills and ideas always requires time and persistence. From a psychological point of view, learning is often accompanied by constant trial and error and adjustment, which is like our brain gradually optimizing its “algorithm” for solving problems.

This is why when we encounter mistakes, we should view them as opportunities to learn and improve, rather than More than just an obsession. By understanding and solving these problems, we can not only fix the current code, but also improve our programming skills and prevent making the same mistakes in future projects.

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  1. Bjarne Stroustrup, “The C++ Programming Language”, 4th Edition, Addison-Wesley, 2013.