real memory 12gb used, 15gb total

  • VPS USING hyper vm
  • Operating system Ubuntu Linux 14.04
  • Webmin version 1.740
  • Virtualmin version 4.14
  • Processor information Intel® Xeon® CPU E5-2620 v2 @ 2.10GHz, 8 cores
  • Real memory 12.13 GB used, 15.25 GB total
  • ran almost 1yr

i have already moved my site to other vps.
but the old one , memory always 12.XX gb, is it wrong msg or?
my new vps (centos 7), also increase memory every day, it is used 1gb / total 15gb, already.

thanks for help.

$ free -m
             total       used       free     shared    buffers     cached
Mem:         15618      15261        357         66        535       2320
-/+ buffers/cache:      12405       3213
Swap:        16383        141      16242
ID   	Owner   	Size   	Command   
1593	mysql	2731604 kB	/usr/sbin/mysqld
1451	bind	720592 kB	/usr/sbin/named -u bind
10111	www-data	516408 kB	/usr/sbin/apache2 -k start
10114	www-data	516400 kB	/usr/sbin/apache2 -k start
12420	www-data	516388 kB	/usr/sbin/apache2 -k start
10382	www-data	516372 kB	/usr/sbin/apache2 -k start
10110	www-data	516348 kB	/usr/sbin/apache2 -k start
10112	www-data	516244 kB	/usr/sbin/apache2 -k start
10113	www-data	516244 kB	/usr/sbin/apache2 -k start
22198	www-data	516236 kB	/usr/sbin/apache2 -k start
52990	www-data	516060 kB	/usr/sbin/apache2 -k start
28714	root	515488 kB	/usr/sbin/apache2 -k start
2519	clamav	444888 kB	/usr/sbin/clamd
44224	opendkim	419620 kB	/usr/sbin/opendkim -x /etc/opendkim.conf -u opendkim -P /var/run/opendkim/opendk ...
10483	yoovcom	419200 kB	/usr/bin/php5-cgi
35959	shoptonecom	418320 kB	/usr/bin/php5-cgi
12819	chungtaigmtcomhk	415168 kB	/usr/bin/php5-cgi
1219	syslog	256616 kB	rsyslogd
10108	www-data	241144 kB	/usr/sbin/apache2 -k start