To find out what processes are using swap space on a Linux system, you can use the top or htop command. These commands display real-time information about the processes running on the system, including their memory usage.
To use top, open a terminal and type top. This will display a list of the currently running processes, along with their CPU and memory usage. To sort the processes by their swap usage, press the f key and then press s. This will display a list of processes sorted by their swap usage, with the processes using the most swap space at the top of the list.
To use htop, open a terminal and type htop. This will display a similar list of processes, but with a more user-friendly interface. To sort the processes by their swap usage, press the F6 key and then select the SWAP column. This will display a list of processes sorted by their swap usage, with the processes using the most swap space at the top of the list.
Both top and htop allow you to view additional information about the processes, such as their PID, user, and command line arguments. You can use this information to identify which processes are using the most swap space and take appropriate action, such as killing the process or reconfiguring it to use less memory.
Alternatively, you can use the free command to view summary information about the system's memory usage, including the amount of swap space being used. To view this information, open a terminal and type free -m. This will display the total amount of swap space, the amount of swap space being used, and the amount of swap space available.