r: The number of runnable processes (running or waiting for run time).If you want to understand this in detail, read the field description below. Vmstat does not require special permissions, and it can help identify system bottlenecks. Vmstat reports information about processes, memory, paging, block IO, traps, disks, and cpu functionality. The vmstat command is another useful tool for reporting virtual memory statistics. # cat /proc/meminfoĭirectMap1G: 2097152 kB 3) How to Check Memory Usage on Linux Using the vmstat Command However it contains useful information about memory usage. It shows memory stats in kilobytes, most of which are somewhat difficult to understand. The “/proc/meminfo” file is a virtual file that contains various real-time information about memory usage. available: Estimation of how much memory is available for starting new applications, without swapping.Ģ) How to Check Memory Usage on Linux Using the /proc/meminfo File.cache: Size of the page cache that holds recently used files in RAM.buffers: Memory reserved by the kernel to hold a process queue request.
shared: Memory shared between two or more processes (multiple processes).free: Unused memory (free= total – used – buff/cache).used: Memory is currently in use by running processes (used= total – free – buff/cache).Total used free shared buff/cache available These information is gathered from the “/proc/meminfo” file. But it provides very little information compared to the “/proc/meminfo” file.įree command displays the total amount of free and used physical and swap memory on the system, as well as buffers and caches used by the kernel.
The following commands can help you check memory usage in Linux in different ways.ġ) How to Check Memory Usage on Linux Using the free Commandįree command is the most powerful command widely used by the Linux administrator. In this tutorial, we will show you eight powerful commands to check memory usage on a Linux system, including RAM and swap.Ĭreating swap space on a Linux system is very important. In Linux, there are commands for everything, so use the corresponding commands. If you want to find out the top 10 memory (RAM) consumption processes in Linux, go to the following article. If there are any applications that use too much resources on the system to run your system at the optimum level you need to find and fix. Linux is not like Windows and you will not get a GUI always, especially in a server environment.Īs a Linux administrator, it is important to know how to check your available and used resources, such as memory, CPU, disk space, etc.
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