Hi all,
I have a server that I think is having problems with memory usage but when I
try to analize with different tools I´m not sure if I having problems with
it
If I run sar -r:
...
04:50:01 kbmemfree kbmemused %memused kbbuffers kbcached kbswpfree
kbswpused %swpused kbswpcad
09:05:01 748036 3401232 81,97 448672 599232
3768868 327664 8,00 40456
09:10:01 749596 3399672 81,93 480028 560856
3768868 327664 8,00 40456
09:15:01 749020 3400248 81,95 481144 559740
3768868 327664 8,00 40456
09:20:01 749516 3399752 81,94 481812 559332
3768868 327664 8,00 40456
09:25:01 749676 3399592 81,93 481928 559216
3768868 327664 8,00 40456
...
free
total used free shared
buffers cached
Mem: 4149268 3407624 741644 0 481084 566300
-/+ buffers/cache: 2360240 1789028
Swap: 4096532 327664 3768868
vmstat 1
procs -----------memory---------- ---swap-- -----io---- --system--
----cpu----
r b swpd free buff cache si so bi bo in cs us sy id
wa
0 0 327664 741412 481444 566200 1 1 10 56 0 2 2 1 96
1
0 0 327664 741412 481452 566192 0 0 0 24 1017 880 1 0 99
1
0 0 327664 741428 481460 566184 0 0 0 60 1012 812 0 0 99
1
0 0 327664 741428 481460 566184 0 0 0 0 1008 835 0 0 100
0
2 1 327664 741428 481464 566180 0 0 0 12 1020 859 0 0 100
0
top -b -d 1 -n 1
top - 09:37:02 up 141 days, 20:15, 1 user, load average: 0.00, 0.02, 0.03
Tasks: 115 total, 1 running, 114 sleeping, 0 stopped, 0 zombie
Cpu(s): 1.6% us, 0.6% sy, 0.2% ni, 96.4% id, 1.2% wa, 0.0% hi, 0.0% si
Mem: 4149268k total, 3408280k used, 740988k free, 481752k buffers
Swap: 4096532k total, 327664k used, 3768868k free, 566152k cached
I have read that linux try to allocate all the RAM memory, so the real free
memory is the free + buffers/cache, is it true? if so, the %memused shown by
sar -r is not true?
Can anybody give a light to understand this (docs, tools...)? with the
commands I have post do you think that I´m having problems with the memory
or can I be calm?
Thanks in advance
ESG
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