Did 10.8.4 lower inactive RAM usage?

Discussion in 'OS X Mountain Lion (10.8)' started by smithrh, Jun 27, 2013.

  1. smithrh macrumors 68020


    Feb 28, 2009
    For a few major releases now, Mac OS X has been fairly, uh, retentive about keeping inactive RAM around. Over time, it wouldn't be uncommon to see 4, 6 or even 10Gb of RAM labeled as inactive.

    Normally, this is a good thing, as the OS can access information in memory very quickly as opposed to accessing an HDD.

    However, there have been many instances where the amount of free RAM would go to zero, and there would be page outs/swapping even though there was RAM available in inactive form.

    Now, with 10.8.4, all of my Macs (I have 5 atm) all show very low amounts of inactive RAM usage - 20 Mb, 89 Mb, 112 Mb, 220 Mb and the "worst" is only at 660 Mb.

    Nothing has changed about my usage patterns. In fact, since I've noticed this, I've cranked up some activities that used to result in inactive RAM increases.

    Does anyone know if 10.8.4 had any VM fixes put in it?

    In any case, mark me as happy :D (so far). My frustration has been with not only the performance problems with respect to swapping, but also the many people here who dismissed this as a non-issue. :mad:
  2. Bear macrumors G3

    Jul 23, 2002
    Sol III - Terra
    I do know that 10.7.5 with the last security update had some memory management improvements.

    10.8.4 seems to have even more improvements over that. I do see my inactive memory climb to over 3 GBs, however I don't see the endless growth I was getting on 10.7.4 that caused unneeded page outs. I've also noticed that 10.8.4 will clean up inactive memory and free some of it.
  3. smithrh thread starter macrumors 68020


    Feb 28, 2009
    Prior to 10.8.4, if I'd use Safari for a day or two inactive RAM would climb very high, and quitting Safari wouldn't have any impact.

    Now, if I use Safari and inactive RAM has gotten up there, I can simply quit Safari and boom, inactive RAM transitions to free.

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