I have a cloud CentOS 5.5 server running Apache. I notice that my memory is very low:
total used free shared buffers cached
Mem: 496 484 12 0 15 266
-/+ buffers/cache: 201 294
Swap: 1023 33 990
Top shows that nothing is swallowing the memory:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
23925 apache 20 0 320m 24m 4404 S 0.0 5.0 0:00.32 httpd
23924 apache 20 0 318m 24m 3744 S 0.0 4.9 0:00.39 httpd
23919 apache 20 0 318m 24m 3740 S 0.0 4.9 0:00.52 httpd
23920 apache 20 0 318m 24m 3636 S 0.0 4.8 0:00.37 httpd
23921 apache 20 0 318m 24m 3596 S 0.0 4.8 0:00.53 httpd
23922 apache 20 0 318m 24m 3612 S 0.0 4.8 0:00.37 httpd
23923 apache 20 0 318m 23m 3668 S 0.0 4.8 0:00.48 httpd
23926 apache 20 0 318m 23m 3600 S 0.0 4.8 0:00.20 httpd
2324 root 20 0 274m 12m 7172 S 0.0 2.6 0:18.74 httpd
1700 root 39 19 226m 3040 1100 S 0.0 0.6 0:02.24 yum-updatesd
1307 root 20 0 71620 1884 548 S 0.3 0.4 0:24.04 munin-node
13551 root 20 0 40960 1124 744 S 0.0 0.2 0:00.44 bash
24420 root 20 0 12800 1012 744 R 0.3 0.2 0:00.22 top
When i restart Apache, memory seems to get freed up:
total used free shared buffers cached
Mem: 496 357 139 0 16 267
-/+ buffers/cache: 73 422
Swap: 1023 33 990
It seems to fall rather quickly.. I dont know what is causing this..
An input guys?
Thanks in advance..
Answer
5% of 496 = 24.8
You have 8 httpd processes using about 5% each Thats pretty much 200mb of memory right there.
and then you have 266MB of memory cached.
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