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Full Discussion: Memory issue on My CentOS 5.8 x64 bit server
Operating Systems Linux Memory issue on My CentOS 5.8 x64 bit server Post 302770766 by sunnysthakur on Monday 18th of February 2013 08:52:02 AM
Old 02-18-2013
Memory issue on My CentOS 5.8 x64 bit server
Hello,

I am using CentOS 5.8 x64 server for our one of internal application which is developed on PHP and Mysql as DB.
Currently there are 8-10 instances deployed on this server some of them are rarely used.

Below is the H/W specification fort the same :-

PHP Code:
[B]Procesor :-[/B] Intel(R) Xeon(R) CPU           X3470  @ 2.93GHz [7 cores]
[B]RAM :-[/B] 15GB 

Now the issue is when i check my RAM it shows 15GB all in user how ever there are no instances running and server load is also OK.

PHP Code:
[root@server]# free -g
             total       used       free     shared    buffers     cached
Mem:            15         15          0          0          0         14
-/+ buffers/cache:          0         15
Swap:           15          0         15
[root@server]# 
Below is the top output
PHP Code:
top - 18:28:01 up 65 days,  7:04,  1 user,  load average: 0.08, 0.14, 0.10
Tasks: 194 total,   1 running, 187 sleeping,   6 stopped,   0 zombie
Cpu(s):  0.1%us,  0.2%sy,  0.0%ni, 99.6%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:  16622452k total, 16162080k used,   460372k free,   215596k buffers
Swap: 16386292k total,       84k used, 16386208k free, 15405992k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
    1 root      15   0  2160  644  556 S  0.0  0.0   0:01.12 init
    2 root      RT  -5     0    0    0 S  0.0  0.0   0:00.05 migration/0
    3 root      34  19     0    0    0 S  0.0  0.0   0:00.00 ksoftirqd/0
    4 root      RT  -5     0    0    0 S  0.0  0.0   0:00.00 watchdog/0
    5 root      RT  -5     0    0    0 S  0.0  0.0   0:00.03 migration/1
    6 root      39  19     0    0    0 S  0.0  0.0   0:00.00 ksoftirqd/1
    7 root      RT  -5     0    0    0 S  0.0  0.0   0:00.00 watchdog/1
    8 root      RT  -5     0    0    0 S  0.0  0.0   0:00.03 migration/2 

Please help me out how to figure out why OS is using huge amount of RAM
 

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