How to monitor web application performance in Linux

In Linux, a popular operating system, there are many useful tools that can help us monitor web application performance. Whether it is a commercial company or a personal project, monitoring application performance is a vital link. It can help us discover, analyze and solve potential problems, thereby making our web applications more reliable and efficient. This article will introduce some commonly used, easy-to-learn Linux performance monitoring tools and techniques to help readers monitor and optimize their web applications.

1. top

The first introduction is the top command. top is a very common Linux performance monitoring program that displays CPU and memory usage in a terminal window. When using top, you can easily sort processes based on CPU or memory usage to identify which processes are using system resources. It is very convenient to use the top command. Just enter the following command in the Linux terminal:

top

If you want to view the processes with the highest CPU usage in the system, you can press the shift P key to sort. In the same way, use shift M to view the processes taking up the most memory.

2. htop

htop is an upgraded version of the top command. It provides more functions and a more user-friendly interface, making performance monitoring more convenient. When you use htop, you can very easily view the running processes, CPU usage, and memory usage in your system. When using the htop command, just enter the following command:

htop

Using the htop command can help you quickly identify which processes are consuming resources, so as to make further optimization and adjustments.

3. vmstat

vmstat is a tool for monitoring memory, CPU and IO usage. It provides details about system performance, including the number of times a specified action is performed per second, the total amount of free memory in the system, and the number of inter-process switches. When using vmstat, you can use the following command to monitor the specified number of actions:

vmstat 5

This command will update the monitoring data at 5-second intervals. You can change the time interval by modifying the value of timer in the command.

4. iostat

iostat is a tool that can monitor disk space usage. It can provide users with information about disk read and write speeds, transfer rates, and the number of requests performed by the disk per second. When using iostat, you can monitor it through the following command:

iostat 5

This command will update the data record every 5 seconds.

5. lsof

lsof can help you find which files are open and which processes are using them. This tool gives us a deeper understanding of what processes and systems are currently doing. When using lsof, you can monitor it through the following command:

lsof -p <pid>

This command will display all open files with the specified pid and their current status.

Summary

This article introduces some commonly used and easy-to-learn Linux performance monitoring tools and techniques. They help users better understand how their web applications are running, thereby improving performance by identifying and resolving issues. Of course, the above tools and techniques are not all. There are other powerful tools that can be used to monitor web application performance, such as Nagios and Zabbix. Hopefully this article can help readers better monitor and optimize their web applications.

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