How to Check VPS RAM Usage with SSH

There are a few tools built-in to most Linux distros for gauging and fine-tuning your server's RAM (memory) usage.

The first is a command called free. To use it, simply run:

# free -m

You will see an output like this:

total used free shared buffers cached

Mem: 512 462 49 0 46 127

-/+ buffers/cache: 287 224

Swap: 2047 0 2047

The important figure to look at is the "used" number in the "buffers/cache" row. This will tell you how much memory your processes are currently using. Memory allocation errors will occur if this number is higher than the total amount of memory and swap space. To see how much RAM is free, check the "free" column in the "buffers/cache" row.


Another useful tool is ps, which will show you all of your running processes with RAM usage as a percent of total RAM:
# ps aux
The output will look like this:
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.0 0.1 10368 632 ? Ss Jan07 0:00 init [3]
root 2 0.0 0.0 0 0 ? S< Jan07 0:00 [migration/0]
root 3 0.0 0.0 0 0 ? SN Jan07 0:00 [ksoftirqd/0]

One of the benefits of a VPS is that, in the case of a memory shortage, you can upgrade RAM on-the-fly with little (Xen) to no (OpenVZ) downtime. Open a support ticket, or find us on live chat, if you need an upgrade!

Was this answer helpful?

 Print this Article

Also Read

How to Setup Ruby on Rails on a CentOS or Fedora VPS

This tutorial will walk you through the setup of a basic Ruby on Rails environment, including:...

How to Install Webmin on Debian

This article will outline the process of installing Webmin, a free hosting control panel, on a...

How to Install CSF on a VPS

  ConfigServer Firewall, or CSF, is a common Linux security suite. Log in to your VPS as the...

Virtualmin Getting Started Guide

After deploying one of the Bitronic Technologies Virtualmin templates we recommend the following...

How to Install OpenVPN on CentOS VPS

  OpenVPN is an open source virtual private network (VPN) software. Follow the steps below...