Page in/Page out ratio - is 2GB RAM enough?

Discussion in 'MacBook Air' started by zub3qin, Nov 8, 2010.

  1. zub3qin macrumors 65816

    zub3qin

    Joined:
    Apr 10, 2007
    #1
    On my 2GB RAM macbook, with normal use, it seems I get about a 4:1 ratio - page ins/page outs.

    Are ANY pageouts bad, or is there a certain ratio to look at? If my page-outs are 25% of Page ins, does it suggest I am OK with my existing RAM?

    I think this is the best way to determine the RAM needs for your future MBA, no?
     
  2. Scott6666 macrumors 65816

    Scott6666

    Joined:
    Feb 2, 2008
    #2
    Since an ssd is practically ram maybe swapping is not that big a deal to performance.
     
  3. zub3qin thread starter macrumors 65816

    zub3qin

    Joined:
    Apr 10, 2007
    #3
    This is true in the short term, but my understanding is that these SSD drives slow down dramatically the more they are "written" to- as would happen with swapping.
     
  4. fyrefly macrumors 6502a

    Joined:
    Jun 27, 2004
    #4
    Not true. Tests have shown that the RAM is 20x faster than the SSD (even the speedy SSD in the new 2010 MBA). The SSD reads/writes around 200mb/s but the RAM read/writes at 4000mb/s.

    SOURCE: http://barefeats.com/mbpp27.html
     
  5. SidBala macrumors 6502a

    Joined:
    Jun 27, 2010
    #5
    Haha. No.
     
  6. Flynnstone, Nov 8, 2010
    Last edited: Nov 8, 2010

    Flynnstone macrumors 65816

    Flynnstone

    Joined:
    Feb 25, 2003
    Location:
    Cold beer land
    #6
    Ideal situation is 0 (zero) page outs.

    I jut upgraded my iMac to 8G. Haven't paged out yet. Once it started to page out with 4G, the system was kind of a dog.
     
  7. SidBala macrumors 6502a

    Joined:
    Jun 27, 2010
    #7
    Actually, RAM is even faster than that depending on the configuration. The fastest DDR3 in tripple channel mode can hit over 16000MB/s

    I suspect that the MBA might use dual channel memory. Still, it is like comparing a horse to a jet airplane in terms of speed.
     

Share This Page