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Weird memory usage in Oracle Linux

I have a oracle linux 7 running Pentaho (an java
application).

This machine has 23 GB of ram and improve pentaho
performance I'm trying to configure java to alocate 10 GB of RAM to pentaho ( -Xms10240m
). But after I start pentaho I get
this.



biserver-ce]# free
            -g
 total used free shared buff/cache available
Mem: 23 4 0 0 18
            18
Swap: 9 0
            9


The math don't match
(4GB used memory + 0 free memory isn't equal to
23G).




The swap memory is unused and I
don't understand why of 18G of data in cache. In another machine with the same config
but for test this not happening.



The java
process running 



 root 12409 1 2
            Jul26 ? 00:21:16 java -
            Djava.util.logging.config.file=/opt/pentaho/server/biserver-ce/tomcat/conf/logging.properties
            -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Dserver -Xmx10240m
            -Xms10240m -XX:MaxPermSize=1024m -Dsun.rmi.dgc.client.gcInterval=3600000
            -Dsun.rmi.dgc.server.gcInterval=3600000 -Dsun.jnu.encoding=utf-8 -Dfile.encoding=utf-8
            -Djava.awt.headless=true
            -Djava.endorsed.dirs=/opt/pentaho/server/biserver-ce/tomcat/endorsed -classpath
            /opt/pentaho/server/biserver-ce/tomcat/bin/bootstrap.jar
            -Dcatalina.base=/opt/pentaho/server/biserver-ce/tomcat
            -Dcatalina.home=/opt/pentaho/server/biserver-ce/tomcat
            -Djava.io.tmpdir=/opt/pentaho/server/biserver-ce/tomcat/temp
            org.apache.catalina.startup.Bootstrap
            start


limits
config



#ulimit
            -a

core file size (blocks, -c) 0
data seg size (kbytes,
            -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f)
            unlimited
pending signals (-i) 190821
max locked memory (kbytes, -l)
            64
max memory size (kbytes, -m) unlimited
open files (-n)
            1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q)
            819200

real-time priority (-r) 0
stack size (kbytes, -s)
            8192
cpu time (seconds, -t) unlimited
max user processes (-u)
            190821
virtual memory (kbytes, -v) unlimited
file locks (-x)
            unlimited


EDIT:




After
clear the cache with 



echo 3 >
            /proc/sys/vm/drop_caches


I
can start the service with 10Gb of RAM, but if I stop the service the cache grow up
again. Is there a way to avoid manually clear the cache every time I stop/start the
service?

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