Memory that once was swapped out, is swapped back in but still also is in the swap file.

In-memory cache for files read from the disk (the page cache). Relatively temporary storage for raw disk blocks that shouldn’t get tremendously large (20MB or so). (since Linux 3.14) An estimate of how much memory is available for starting new applications, without swapping. Total usable RAM (i.e., physical RAM minus a few reserved bits and the kernel binary code). Understanding memory utilization parameters Fields description table Parameter Use the cat command/ less command or grep command/ egrep command as follows on your Linux box:Įach line of the /proc/meminfo file consists of a parameter name, followed by a colon, the parameter value, and an option unit of measurement. The /proc/meminfo file reports statistics about memory usage on Linux. It would be best if you kept an eye on buffers and caches used by the kernel too. A developer or seasoned sysadmin must know the total amount of free and used physical, including swap memory in the server.

Memory plays a critical role in a Linux system. Your Linux system must run at an optimal level. Commands to check memory utilization in Linux

Linux memory usage monitoring