Searched but cannot find solution to Page outs vs Inactive memory problem

Discussion in 'Mac Pro' started by iamsilvermember, Jun 10, 2010.

  1. iamsilvermember macrumors newbie

    Oct 27, 2007
    Attached is screen shot of memory allocation on my computer. Even there are many GB's of memory inactive, there are no more free ram, page outs is still being utilized...

    I went as far as unloading/disabling dynamic pager by using the command:

    sudo launchtl unload -w /System/Library/LaunchDaemons/

    Which successfully avoided "Swap Used" without any problem after many days of test, but I don't understand why "Page outs" is still huge consider there are so much free ram...

    Any suggestion or idea?

    Thanks in advance!

    Attached Files:

  2. Hellhammer Moderator


    Staff Member

    Dec 10, 2008
  3. Vylen macrumors 65816

    Jun 3, 2010
    Sydney, Australia
    It's possible that this is normal. While inactive memory essentially equates to bring free, there's no guarantee that giving inactive memory to an application is free - that is, it requires memory in order to clean certain blocks of memory before passing it on. And since you have a small amount of free memory, it needs to page other unused blocks in order to do this.

    Of course, this is speculative until someone who knows the internal memory management system of OS X can confirm or deny this, but I don't think this will happen any time soon.
  4. gnasher729 macrumors P6


    Nov 25, 2005
    500 MB of pagein/out is _nothing_. Stop worrying.
  5. DualShock macrumors 6502

    Jun 29, 2008
    I believe the answer is your usage of Vuze.

    Torrent clients seem to cache the files they are actively uploading in RAM. I've noticed the same behavior with Transmission.

    If you close down Vuze you'll see that RAM slowly get collected by OS X and reallocated to either active or free memory.

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