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NOTE: CentOS Enterprise Linux 5 is built from the Red Hat Enterprise Linux source code. Other than logo and name changes CentOS Enterprise Linux 5 is compatible with the equivalent Red Hat version. This document applies equally to both Red Hat and CentOS Enterprise Linux 5.

37.2. Memory Usage

The free command displays the total amount of physical memory and swap space for the system as well as the amount of memory that is used, free, shared, in kernel buffers, and cached.


             total       used       free     shared    buffers     cached
 Mem:        645712     549720      95992          0     176248     224452
 -/+ buffers/cache:     149020     496692
 Swap:      1310712          0    1310712
 

The command free -m shows the same information in megabytes, which are easier to read.


             total       used       free     shared    buffers     cached 
Mem:           630        536         93          0        172        219 
-/+ buffers/cache:        145        485 
Swap:         1279          0       1279

If you prefer a graphical interface for free, you can use the GNOME System Monitor. To start it from the desktop, go to System => Administration => System Monitor or type gnome-system-monitor at a shell prompt (such as an XTerm). Click on the Resources tab.

GNOME System Monitor - Resources tab

Figure 37.2. GNOME System Monitor - Resources tab


 
 
  Published under the terms of the GNU General Public License Design by Interspire