Skip navigation

Activity Monitor not showing all RAM

2733 Views 22 Replies Latest reply: Dec 27, 2012 7:42 AM by Stephen Johnson RSS
1 2 Previous Next
Stephen Johnson Calculating status...
Currently Being Moderated
Sep 13, 2012 7:02 PM

I just upgraded to 10.6.3 and then 10.6.8 on my Mac Mini. With 10.6.3 Activity Monitor started showing total of 3 GB of RAM instead of 4 GB as System Profile does show. I ran Rember and all tests passed. It showed 4 GB total memory and 1690 MB available memory which seems consistent with AM's Free memory.

Any ideas why the system seems to "see" (System Profiler) all the memory but not be using it (AM)?

 

Stephen

Mac mini, Mac OS X (10.6.8), 1.83Ghz, 4 GB RAM
  • BobHarris Level 6 Level 6 (12,480 points)
    Currently Being Moderated
    Sep 14, 2012 8:01 AM (in response to Stephen Johnson)

    Chances are your Mac mini can ONLY use 3 of the 4GB you have installed.  My 1.83GHz Core 2 Duo Mac mini has two 2GB DIMMs installed, HOWEVER, I can ONLY use 3GB of that RAM.

     

    My guess is System Profiler is telling you the physical RAM installed, but Activity Monitor is telling you want the operating system is able to see.

     

    This is ONLY a guess, as maybe your Mac mini is different from mine.

  • WZZZ Level 6 Level 6 (11,875 points)
    Currently Being Moderated
    Sep 14, 2012 8:27 AM (in response to BobHarris)

    I have a related question about the pie chart.

     

    Here's mine:

     

    Screen shot 2012-09-14 at 11.10.07 AM.png

     

    I have 12GB installed. Free at 9.72 + Used at  2.28 adds up to 12GB.

     

    But adding up Wired at 957.4MB, Active at 754.1MB, and Inactive at 632.4MB comes to 2.3GB (rounded). Adding that to the pie chart figure of 11.75 gives a total of 14.05GB, which isn't possible. What does the pie chart figure at 11.75GB represent? It can't be the 12GB minus the Wired, Active and Inactive either, since that would be much less than 11.75. And if it's supposed to be the total of installed Memory, why the missing .25GB?

  • Jeffrey Jones2 Level 6 Level 6 (8,425 points)
    Currently Being Moderated
    Sep 14, 2012 9:00 AM (in response to Stephen Johnson)

    Check out the VM size, too. 144 GB. My harddrive is not big enough for that much VM!

    VM size has nothing to do with your disk size. Don't confuse it with swap space -- it's only using 57 MB of swap space. VM size is pretty much an abstract concept that you should ignore. 144 GB is unremarkable.

  • baltwo Level 9 Level 9 (59,145 points)
    Currently Being Moderated
    Sep 15, 2012 2:10 PM (in response to WZZZ)

    WZZZ wrote:

    I have a related question about the pie chart.

     

    I have 12GB installed. Free at 9.72 + Used at  2.28 adds up to 12GB.

     

    But adding up Wired at 957.4MB, Active at 754.1MB, and Inactive at 632.4MB comes to 2.3GB (rounded). Adding that to the pie chart figure of 11.75 gives a total of 14.05GB, which isn't possible. What does the pie chart figure at 11.75GB represent? It can't be the 12GB minus the Wired, Active and Inactive either, since that would be much less than 11.75. And if it's supposed to be the total of installed Memory, why the missing .25GB?

    Wired+Active+Inactive = Used. Thus, 9.72+2.28 ≃ 9.7.2+2.3 ≃ 12. The 11.75 is a mucked up AM reading. Check the memory via About this Mac->More info. Mine shows exactly 12 GB.

     

    Screen shot 2012-09-15 at 2.09.29 PM.png

  • WZZZ Level 6 Level 6 (11,875 points)
    Currently Being Moderated
    Sep 15, 2012 3:08 PM (in response to baltwo)

    System Profiler sees all 12GB. I was concerned I might be in the same boat as the OP, losing some off the top. Either that or AM is messed up. It's always showing 11.75, even on a restart. But, interestingly, Free and Used always adds up to 12.

     

    I can see what the breakdown is later using top, and if it agrees with AM. I might trust top to be more accurate.

  • baltwo Level 9 Level 9 (59,145 points)
    Currently Being Moderated
    Sep 15, 2012 3:17 PM (in response to WZZZ)

    top shows:

     

    PhysMem: 696M wired, 1871M active, 1309M inactive, 3876M used, 8405M free.

     

    I didn't add them up, being too lazy and since AM's always been accurate.

    27" i7 iMac SL, Lion, OS X Mountain Lion (10.8.1), G4 450 MP w/Leopard, 9.2.2
  • WZZZ Level 6 Level 6 (11,875 points)
    Currently Being Moderated
    Sep 15, 2012 3:21 PM (in response to baltwo)

    I'm supposing if Free and Used always adds up to 12, I can disregard the pie chart.

  • baltwo Level 9 Level 9 (59,145 points)
    Currently Being Moderated
    Sep 15, 2012 3:30 PM (in response to WZZZ)

    That's what I'd do. However, you could nuke the activity monitor plist file and relaunch it.

    27" i7 iMac SL, Lion, OS X Mountain Lion (10.8.1), G4 450 MP w/Leopard, 9.2.2
  • WZZZ Level 6 Level 6 (11,875 points)
    Currently Being Moderated
    Sep 15, 2012 4:46 PM (in response to baltwo)

    AM plist nuked, no difference. I have now filed this under useless dead-end investigations of glitches and anomalies.

  • baltwo Level 9 Level 9 (59,145 points)
    Currently Being Moderated
    Sep 15, 2012 5:09 PM (in response to WZZZ)

    thumbsup.gif

    27" i7 iMac SL, Lion, OS X Mountain Lion (10.8.1), G4 450 MP w/Leopard, 9.2.2
1 2 Previous Next

Actions

More Like This

  • Retrieving data ...

Bookmarked By (0)

Legend

  • This solved my question - 10 points
  • This helped me - 5 points
This site contains user submitted content, comments and opinions and is for informational purposes only. Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site. All postings and use of the content on this site are subject to the Apple Support Communities Terms of Use.