To find out what is using up all the virtual memory (also known as virtual address space or swap space) on a Linux system, you can use the following commands:
free command:free -m
This will show the amount of used and available virtual memory in megabytes (MB).
swapon command:swapon -s
This will show the amount of used and available swap space in kilobytes (KB).
To find out what processes are using the most virtual memory, you can use the top command. Press the M key to sort the processes by virtual memory usage. The processes at the top of the list are the ones that are using the most virtual memory.
To find out more detailed information about the virtual memory usage of a specific process, you can use the pmap command followed by the process ID. For example, to find out the virtual memory usage of the httpd process with the process ID of 1234:
pmap 1234
This will show the virtual memory usage of the httpd process, including the sizes of the different memory regions and the total virtual memory usage.
Note: Virtual memory is a feature of the operating system that allows a process to access more memory than is physically available by temporarily transferring data to a swap file on disk. When the virtual memory usage of a system is high, it can indicate that the system is running out of physical memory and is using the swap file heavily. This can lead to slower performance and increased disk activity. To improve the performance