Check if Linux system memory usage is exhausted? These 5 commands are awesome! Detailed explanation!

In Linux systems, there are a variety of commands that can be used to check the memory usage of the system to help identify potential memory exhaustion issues. Here are five common commands you can use to check your Linux system memory usage with detailed instructions:

1. free command:

   • The free command is used to display the usage and free status of system memory.
   • Run
     The free command can obtain the total memory, used memory, free memory, and cache and buffer usage.
   • Command example:
     free -h, this command will display memory usage in human-readable format.

2. top command:

   • The top command is a utility that dynamically monitors system resources, including memory usage.
   • Run
     topAfter command, you can view the process occupying the most memory in the system and the detailed information of memory usage.
   • exist
     topIn the interface, press
     Shift MYou can sort the process list according to memory usage.

3. vmstat command:

   • The vmstat command is used to report virtual memory statistics, including memory usage.
   • Run
     The vmstat command can obtain memory usage statistics, including the number of active pages, free pages, and swap-out/swap-in of memory.
   • Command example:
     vmstat -s, this command will display more detailed memory statistics.

4. ps command:

   • The ps command is used to display the status information of the currently running process, including memory usage.
   • Run
     The ps command can get the memory usage of the process and sort or filter as needed.
   • Command example:
     ps aux --sort=-%mem, this command will list all processes in order from high to low memory usage.

5. htop command:

   • The htop command is an interactive process viewer that provides real-time information about processes and system resources, including memory usage.
   • Run
     htopAfter executing the command, you can view the processes running in the system and their memory usage, CPU usage and other detailed information.
   • htopThe interface is intuitive and easy to use, and you can easily check memory usage and related processes.

Using these five commands, you can have a comprehensive understanding of the memory usage of the Linux system to determine whether there is a memory exhaustion problem. These commands provide multiple levels and perspectives of memory information to help you locate and resolve memory performance-related issues.

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