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Thread: Where's all my memory going?

  1. #1
    suburbancow NNTP User

    Default Where's all my memory going?


    I'm a fairly new openSUSE and linux user, first time posting to these
    forums, so I apologize in advance if this is the wrong forum, but here
    goes.

    I have noticed my machine is not quite as zippy as I was hoping and
    noticed strange (to me) patterns in my memory usage. Here's the output
    from top:

    john@linux-yq5y:~> top
    top - 22:56:25 up 1 day, 15:23, 1 user, load average: 0.63, 0.44,
    0.34
    Tasks: 111 total, 3 running, 108 sleeping, 0 stopped, 0 zombie
    Cpu(s): 5.0%us, 2.3%sy, 0.0%ni, 92.6%id, 0.0%wa, 0.0%hi, 0.0%si,
    0.0%st
    Mem: 449624k total, 286388k used, 163236k free, 8912k
    buffers
    Swap: 2096472k total, 222504k used, 1873968k free, 92780k
    cached

    PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
    20475 john 20 0 76540 19m 13m R 2.7 4.4 0:29.40 konsole
    2108 root 20 0 271m 48m 1832 R 2.3 11.1 67:37.86 Xorg
    2932 john 20 0 85096 23m 2692 S 1.7 5.2 27:39.11
    knetworkmanager
    2886 john 20 0 160m 9.9m 4116 S 1.0 2.3 28:58.37 knotify4
    1648 messageb 20 0 2696 896 528 S 0.3 0.2 5:38.38
    dbus-daemon
    2810 john 20 0 74768 4708 2372 S 0.3 1.0 2:21.31 kded4
    1 root 20 0 772 64 40 S 0.0 0.0 0:02.74 init
    2 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 kthreadd
    3 root RT -5 0 0 0 S 0.0 0.0 0:00.00
    migration/0
    4 root 15 -5 0 0 0 S 0.0 0.0 0:01.00
    ksoftirqd/0
    5 root 15 -5 0 0 0 S 0.0 0.0 0:09.54 events/0
    6 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 khelper
    7 root 15 -5 0 0 0 S 0.0 0.0 0:02.42 kblockd/0
    8 root 15 -5 0 0 0 S 0.0 0.0 0:16.72 kacpid
    9 root 15 -5 0 0 0 S 0.0 0.0 0:01.40
    kacpi_notify
    10 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 cqueue
    11 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 kseriod
    12 root 15 -5 0 0 0 S 0.0 0.0 0:23.70
    kondemand/0
    15 root 15 -5 0 0 0 S 0.0 0.0 0:14.98 kswapd0
    16 root 15 -5 0 0 0 S 0.0 0.0 0:00.00
    aio/0

    If you add up all the memory use, it comes out to 24.2%. As you can
    see, my total memory is 449624k. 449624k * 24.2% = 108809k. So why is
    my memory listed as 286388k used?

    Also, I realize (after previewing my post) that the top output is
    pretty tough to read - all the spaces seem to get stripped out by the
    forum software. If it's hard to read and you can suggest a way to make
    it more readable, I can repost it.


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  2. #2
    caf4926 NNTP User

    Default Re: Where's all my memory going?


    Most of the time you should see very little free memory as mostly it is
    cached


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  3. #3
    suburbancow NNTP User

    Default Re: Where's all my memory going?


    Oh, I'm running openSUSE 11.0, KDE 4.0.4, pretty much an out-of-the-box
    install.


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  4. #4
    suburbancow NNTP User

    Default Re: Where's all my memory going?


    Pardon my ignorance, but what do you mean by it being cached?


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  5. #5
    nzlbob23 NNTP User

    Default Re: Where's all my memory going?


    I think used includes memory set aside as buffer memory. You can also
    use -ksysguard- to monitor activity which is a lot easier to read with
    its pretty graphs!


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  6. #6
    caf4926 NNTP User

    Default Re: Where's all my memory going?


    suburbancow;1918892 Wrote:
    > Oh, I'm running openSUSE 11.0, KDE 4.0.4, pretty much an out-of-the-box
    > install.


    Ick

    Either upgrade that kde4 or use kde3

    Stable kde4 upgrade you need to add these repos

    'Index of /repositories/KDE:/KDE4:/STABLE:/Desktop/openSUSE_11.0'
    (http://tinyurl.com/3ttxs3)

    'Index of /repositories/KDE:/KDE4:/STABLE:/Extra-Apps/openSUSE_11.0'
    (http://tinyurl.com/6ysprc)

    'Index of
    /repositories/KDE:/KDE4:/Community/openSUSE_11.0_KDE4_STABLE_Desktop'
    (http://tinyurl.com/58c7on)

    You can install kde3 from Yast -Software Management - Patterns

    add
    kde3base
    kde3desktop

    disable auto login and you can choose to use kde3 or kde4 at the login
    screen


    --
    Box: Linux 2.6.25.18-0.2 x86_64 | OS 11.0 | (KDE4.1.86) "5.1" | M2N4-SLI
    | AMD 64 X2 5200+ | nVidia 8500GT | 2GB RAM
    http://tinyurl.com/985fp2
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  7. #7
    swerdna NNTP User

    Default Re: Where's all my memory going?


    suburbancow;1918887 Wrote:
    > Also, I realize (after previewing my post) that the top output is pretty
    > tough to read - all the spaces seem to get stripped out by the forum
    > software. If it's hard to read and you can suggest a way to make it
    > more readable, I can repost it.

    Hope that helps


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  8. #8
    ab@novell.com NNTP User

    Default Re: Where's all my memory going?

    -----BEGIN PGP SIGNED MESSAGE-----
    Hash: SHA1

    For example:

    <quote>
    ab@ablaptop:~> free
    total used free shared buffers cached
    Mem: 4043336 2529728 1513608 0 208 1408152
    - -/+ buffers/cache:1121368 2921968
    Swap: 1052216 0 1052216
    </quote>

    As you can see from my box I have 1.5 GB free space in RAM.... but I
    don't have a whole lot open (a dozen or so user-space apps besides
    whatever the system and Gnome load on their own)... so, where has all my
    space gone? In the last category you can see I have 1.4 GB cached data,
    which means data that are on the filesystem but which is beind held in
    excess RAM to speed things up. This is a very good thing since it means
    an instance performance boost any time my system needs a file that is
    already in cache (libraries, documents, executables, etc.) since there
    is no need to go all the way to the super-slow (relatively speaking)
    hard drive to fetch the data. Cache is also instantly dumped if an
    application needs it for something that can't be done outside RAM so
    there really aren't any downsides.

    Good luck.





    suburbancow wrote:
    > Pardon my ignorance, but what do you mean by it being cached?
    >
    >

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  9. #9
    suburbancow NNTP User

    Default Re: Where's all my memory going?


    Thanks for your quick responses, caf4926, nzlbob23, and ab@novell.com.
    And swerdna, thanks for the formatting help.

    caf, I'm installing KDE3 as we speak. This has been a good learning
    experience, now I'll see what kind of trouble I can get into playing
    around with different window managers.

    There's no reason I can't install, say, KDE3, 4, and, say Xfce and try
    them all out, right? (Other than obvious disk space limitations.)


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  10. #10
    caf4926 NNTP User

    Default Re: Where's all my memory going?


    suburbancow;1919198 Wrote:
    > Thanks for your quick responses, caf4926, nzlbob23, and ab@novell.com.
    > And swerdna, thanks for the formatting help.
    >
    > caf, I'm installing KDE3 as we speak. This has been a good learning
    > experience, now I'll see what kind of trouble I can get into playing
    > around with different window managers.
    >
    > There's no reason I can't install, say, KDE3, 4, and, say Xfce and
    > try them all out, right? (Other than obvious disk space limitations.)


    Quite correct to the above.


    --
    Box: Linux 2.6.25.18-0.2 x86_64 | OS 11.0 | (KDE4.1.86) "5.1" | M2N4-SLI
    | AMD 64 X2 5200+ | nVidia 8500GT | 2GB RAM
    http://tinyurl.com/985fp2
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