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free -m memstat memory problems

Discussion in 'Web Hosting' started by Mutikasa, Dec 12, 2012.

  1. Mutikasa

    Mutikasa Power Member

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    Hi,
    on Debian squeeze my free -m shows
    Code:
                 total       used       free     shared    buffers     cached
    Mem:           502        476         25          0         83        120
    -/+ buffers/cache:        272        230
    Swap:          871          3        868
    and my memstat shows this
    Code:
         36k(     32k): /sbin/init 1
        156k(    132k): /sbin/udevd 354 529 530 354 529 530 354 529 530
    --------
      74804k (  23216k)
    Why is the difference and why free shows 460MB used when I'm not running any significant process?
    I even stopped Apache and it still shows high usage.
     
  2. t0p3a

    t0p3a Newbie

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    The memory is not used but is cached so don't worry about it.

    type on google "linuxatemyram" and check that page will give you more info about why you see used ram
     
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  3. Mutikasa

    Mutikasa Power Member

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    well, according to that site it means I only have 260MB free, which is still low.
    I guess memstat is the more precise one
     
  4. t0p3a

    t0p3a Newbie

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    You should use top and see which processes is eating your ram in that case.

    post the output of top here
     
  5. Mutikasa

    Mutikasa Power Member

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    Code:
    top - 11:12:21 up 29 days, 12:23,  1 user,  load average: 0.00, 0.00, 0.00
    Tasks:  83 total,   1 running,  82 sleeping,   0 stopped,   0 zombie
    Cpu(s):  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
    Mem:    514564k total,   478984k used,    35580k free,    97076k buffers
    Swap:   892920k total,     3256k used,   889664k free,    69928k cached
    
      PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
        1 root      20   0  2036  276  248 S    0  0.1   0:29.42 init
        2 root      20   0     0    0    0 S    0  0.0   0:00.10 kthreadd
        3 root      RT   0     0    0    0 S    0  0.0   0:01.74 migration/0
        4 root      20   0     0    0    0 S    0  0.0   0:00.85 ksoftirqd/0
        5 root      RT   0     0    0    0 S    0  0.0   0:00.00 watchdog/0
        6 root      RT   0     0    0    0 S    0  0.0   0:02.49 migration/1
        7 root      20   0     0    0    0 S    0  0.0   0:00.51 ksoftirqd/1
        8 root      RT   0     0    0    0 S    0  0.0   0:00.00 watchdog/1
        9 root      20   0     0    0    0 S    0  0.0   0:22.56 events/0
       10 root      20   0     0    0    0 S    0  0.0   0:22.24 events/1
       11 root      20   0     0    0    0 S    0  0.0   0:00.00 cpuset
       12 root      20   0     0    0    0 S    0  0.0   0:00.00 khelper
       13 root      20   0     0    0    0 S    0  0.0   0:00.00 netns
       14 root      20   0     0    0    0 S    0  0.0   0:00.00 async/mgr
       15 root      20   0     0    0    0 S    0  0.0   0:00.00 pm
       16 root      20   0     0    0    0 S    0  0.0   0:05.28 sync_supers
       17 root      20   0     0    0    0 S    0  0.0   0:04.64 bdi-default
    
    I don't see much
     
  6. t0p3a

    t0p3a Newbie

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    True that... somehow your memory is swapped and cached at same time i think that is why you see a lot of used memory

    Swap can also occur when the provide it's overselling.

    But i am not that experienced so probably ask a professional on some linux sites.
     
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    Last edited: Dec 13, 2012
  7. xrfanatic

    xrfanatic Jr. VIP Jr. VIP Premium Member

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    Location:
    http://bit.ly/slb64
    Home Page:
    You can also try htop, a bit more convinient to navigate through processes.
     
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