My File cache is 1.5GB at login

Discussion in 'Mac Basics and Help' started by Redstoneq42, May 15, 2014.

  1. Redstoneq42 macrumors newbie

    Joined:
    Jul 13, 2013
    #1
    My File cache is at 1.5GB as soon as a login. If I run the memory clean app, it reduces it to about 250mb if I have no other apps open. Is this normal? Is there something I can do to reduce it without using memory clean? Thanks.
     
  2. MartinAppleGuy macrumors 68020

    MartinAppleGuy

    Joined:
    Sep 27, 2013
    #2
    Why are you trying to lower it? File Caching allows for apps previously opened to open instantly. If your RAM fills up to being almost full, it will clear all of your file cache, then it will compression around 50-60% of your total RAM before it then page's-out. Just leave it. Free RAM =wasted RAM, and if an app needed more RAM the OS would clear file cache for you.
     
  3. Redstoneq42 thread starter macrumors newbie

    Joined:
    Jul 13, 2013
    #3
    But the more RAM is in use, the more my computer tends to heat up and use the fans. Is that normal?
     
  4. MartinAppleGuy, May 15, 2014
    Last edited: May 15, 2014

    MartinAppleGuy macrumors 68020

    MartinAppleGuy

    Joined:
    Sep 27, 2013
    #4
    By using more RAM (i.e running lots of apps), your computer will get hotter. This is not due to the increased amount of RAM in use, but the more CPU usage due to all of the apps open. File cache on the other hand will not make it hotter.

    ----------

    For you to understand the way OSX manages RAM, it might be best for you to experience it first hand (I also say another thread you made were you were wondering why you were using so much RAM). First, I will tell you my experience:


    Now to do this yourself, open Activty Monitor and look at the memory tab. Now go to your Application folder in finder, then press CMD-A (to select all) and double click one of the apps. This will open every app you have on your computer. Once all are open, then look at Activity Monitor. If the memory pressure bar is still green, you are still not pushing it. If so, try opening a lot of tabs in a web browser (Chrome, Safari...) and watch your usage build up.

    You will notice through doing this, your computer will first go from 4Gb of RAM (while running nothing) to 7.99Gb, then it will clear file cache, then it will compress your RAM to a point where you have pushed it too far and it has to swap. While doing the above, look at the Virtual Memory to see how much data is in RAM (with Mavericks, you can fit 6Gb of data on 4Gb of RAM and, through my tests, 18.5Gb with 8Gb of RAM.

    PS- only open all of your apps if you are comfortable with closing them all down again, it can take a long time to close everything again!
     
  5. MartinAppleGuy macrumors 68020

    MartinAppleGuy

    Joined:
    Sep 27, 2013
    #5
    And just to let you know, I have 3.8Gb of file cache right now.
     
  6. GPap macrumors regular

    GPap

    Joined:
    May 5, 2014
    #6
    You can try Onyx, maybe it's good for your case. Use Automation tab or whatever you want.
     

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