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Thread: Memory usage on Ubuntu Desktop 12.04 64 bits

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  1. #1
    Join Date
    May 2012
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    48

    Memory usage on Ubuntu Desktop 12.04 64 bits

    Hello,

    I am running my ubuntu desktop 12.04 to host 1 site on it. The machine is good, but i have a little problem.
    PC Specs:
    CPU: MD FX-6200 /3.8G/X6/BOX AM3+
    RAM: 8GB DDR III 1333Mhz

    When i check my ram usage i got this:
    Code:
                 total       used       free     shared    buffers     cached
    Mem:          7970       6907       1062          0         38       6039
    -/+ buffers/cache:        830       7139
    Swap:         8173          0       8173
    and something the server use all 8 GB ram and the site stop work. Any ideas from where come the problem and i can't understand what is really memory usage Mem or +/-buffers/cache, because the difference is big.

    Thanks !
    Last edited by CharlesA; November 12th, 2012 at 07:29 PM. Reason: code tags

  2. #2
    Join Date
    Dec 2007
    Location
    California
    Beans
    4,958
    Distro
    Ubuntu 16.04 Xenial Xerus

    Re: Memory usage on Ubuntu Desktop 12.04 64 bits

    you have nearly 7 GB's free, install htop, it'll show you more clearly.

    you subtract buffers and cache to find how much ram is free.
    "You can't expect to hold supreme executive power just because some watery tart lobbed a sword at you"

    "Don't let your mind wander -- it's too little to be let out alone."

  3. #3
    Join Date
    May 2012
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    48

    Re: Memory usage on Ubuntu Desktop 12.04 64 bits

    Okay thanks, but then why the site stop work when the first line use all memory ? I restart apache and mysql server and the pc still use 6.5 GB ram ? Is there a way to increase it or from where can come the problem. Thanks !

  4. #4
    Join Date
    Dec 2007
    Location
    California
    Beans
    4,958
    Distro
    Ubuntu 16.04 Xenial Xerus

    Re: Memory usage on Ubuntu Desktop 12.04 64 bits

    I doubt it's your ram, since you have a ton of free ram.

    Check your logs to see if there are any clues in there (when they stop working)
    (I'm just guessing at which logs might be useful, I am neither an apache or a mysql server expert and am just trying help you get some useful info in your thread)
    Code:
    tail /var/log/apache2/error.log
    I'm not sure what mysql's log would be called but it should be somewhere under /var/log
    "You can't expect to hold supreme executive power just because some watery tart lobbed a sword at you"

    "Don't let your mind wander -- it's too little to be let out alone."

  5. #5
    Join Date
    Jun 2011
    Beans
    357

    Re: Memory usage on Ubuntu Desktop 12.04 64 bits

    When you run the "free" command the second line shows you how much RAM is used and how much is free. You have 7GB of free memory, so your RAM isn't full. The problem with your web server is probably unrelated to memory.

    Maybe you're getting a lot of connection attempts? Is it possible the server is still running and is just backed up and slow to respond?

  6. #6
    Join Date
    May 2012
    Beans
    48

    Re: Memory usage on Ubuntu Desktop 12.04 64 bits

    I don't think that the problem comes from apache or mysql I restart both and when i type:
    free -m, the first line show used: 6500 free 1500. What is this and the second line show about 1 use and 7 free.

    Thnaks !

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