This system is quite busy, but the used RAM seems high. In figure 1 above, the total is 94 GB, used is 44 GB, and free is 49 GB. In the case of RHEL 6, the focus should be on the -/+ buffers/cache column. However, as with most commands, the relevant columns to check which may be of interest to the system administrator when doing housekeeping or troubleshooting an issue are explained below. It also seeks to display the memory held in cache and buffers as well. The various columns, displayed by the various releases above, seek to identify the Total, used, free, shared memory. Please run free -help for more information on the options. You can also use free -h to show output in human-readable output. To make the output above more readable, the command provides various options:įree -b, -k, -m, -g: Display the amount of memory in bytes, kilobytes, megabytes, gigabytes respectively. RHEL 8 will have an output similar as below: ~]# free -h Total used free shared buff/cache available RHEL 7/8 displays information similar to the ~]# free -h On RHEL 6, typing free -h (I used the -h option for human-readable format) shows output similar to the following: ~]# free -h However, in all these versions, there are key parameters that do not change. In Red Hat Enterprise Linux (RHEL) 6, the output is somewhat different from that of RHEL 7 and 8. Like any other command, free has gone through revisions over time to make its output meaningful and accurate for decision making. The information is gathered by parsing /proc/meminfo. The man page for this command states that free displays the total amount of free and used memory on the system, including physical and swap space, as well as the buffers and caches used by the kernel. It's a powerful tool that gives insight into the memory usage in human-readable format. Linux system administration skills assessmentįree is a popular command used by system administrators on Unix/Linux platforms.A guide to installing applications on Linux.
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