memory usage free -m | free column is Free + Cached + buffers

By OK -
# free -mt
total used free shared buffers cached
Mem: 7974 7921 53 0 27 2107
-/+ buffers/cache: 5786 2187
Swap: 5945 923 5022
Total: 13920 8844 5075

 You get a similar misleading result, but you get to see the actual server condition too.

 As you can see, the first free value is very low and that’s what is concerning you.

 However I want to draw your attention to the next line. That’s really where you need to watch.
If you look at the buffers/cache line, you can see that used value is 5786mb and we have 2107mb in the free column. That free column is the Free + Cached + buffers (plus/minus rounding error of less than 2 Kbytes). That’s really the line that you need to watch.

 From that line we can tell that we have used 5.79gb out of the 7.97gb of total physical memory already used by programs. We can also see that we have 2.19gb of RAM that is in the cached pool that is available for usage.



To look at how much memory each program is using, I use this line:

# ps aux|head -1;ps aux | sort -nr -k 4 | head -20
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
102 4123 0.4 10.8 1196416 885840 ? Ssl Feb18 25:26 memcached [...]
mysql 17929 7.6 3.0 949372 248040 pts/3 Sl 06:05 23:32 /usr/libexec/mysqld [...]
root 7059 0.0 1.6 204360 138040 ? Ssl Feb18 0:28 /usr/sbin/clamd
apache 26931 1.2 0.8 225096 69956 ? S 11:06 0:05 /usr/bin/php-cgi
apache 26631 1.0 0.8 223304 66856 ? S 11:04 0:05 /usr/bin/php-cgi
apache 26458 1.5 0.8 223488 66824 ? S 11:03 0:09 /usr/bin/php-cgi
apache 23879 0.5 0.8 225068 68376 ? S 10:48 0:08 /usr/bin/php-cgi
root 26404 0.0 0.7 131956 58708 ? S Feb20 0:04 spamd child
root 24156 0.1 0.7 136320 63308 ? S 07:04 0:28 spamd child



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