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ubuntu - What is using up my RAM in VPS?

I'm running top and I see that out of 502968 KB, 48064 KB
is used leaving 16884 KB free. But then when I look at the individual processes I see
that mysql is consuming 9.4% of my RAM on occasion - but nothing else seems to be
consuming anything. What is consuming all my
RAM?



Here is a screen capture from
top:




top - 20:46:07 up
            1 min, 1 user, load average: 0.18, 0.05, 0.02
Tasks: 81 total, 1 running, 80
            sleeping, 0 stopped, 0 zombie
%Cpu(s): 0.0 us, 0.4 sy, 0.0 ni, 99.6 id, 0.0
            wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem: 502968 total, 241236 used, 261732 free,
            10488 buffers
KiB Swap: 524284 total, 0 used, 524284 free, 106756
            cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+
            COMMAND
1584 dmackey 20 0 20508 1372 1000 R 0.4 0.3 0:00.01 top
1
            root 20 0 26664 2456 1340 S 0.0 0.5 0:00.69 init

2 root 20 0 0 0 0
            S 0.0 0.0 0:00.00 kthreadd
3 root 20 0 0 0 0 S 0.0 0.0 0:00.01
            ksoftirqd/0
4 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kworker/0:0
5 root 0
            -20 0 0 0 S 0.0 0.0 0:00.00 kworker/0:0H
6 root 20 0 0 0 0 S 0.0 0.0 0:00.00
            kworker/u:0
7 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/u:0H
8 root
            rt 0 0 0 0 S 0.0 0.0 0:00.00 migration/0
9 root 20 0 0 0 0 S 0.0 0.0 0:00.00
            rcu_bh
10 root 20 0 0 0 0 S 0.0 0.0 0:00.24 rcu_sched
11 root rt 0 0
            0 0 S 0.0 0.0 0:00.00 watchdog/0

12 root 0 -20 0 0 0 S 0.0 0.0
            0:00.00 cpuset
13 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 khelper
14 root
            20 0 0 0 0 S 0.0 0.0 0:00.00 kdevtmpfs
15 root 0 -20 0 0 0 S 0.0 0.0 0:00.00
            netns
16 root 20 0 0 0 0 S 0.0 0.0 0:00.00
            bdi-default


And here
is one from free:



 total used free
            shared buffers cached

Mem: 502968 355252 147716 0 10816
            111548
-/+ buffers/cache: 232888 270080
Swap: 524284 0
            524284

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