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

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

  1. zub3qin macrumors 65816


    Apr 10, 2007
    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


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


    Apr 10, 2007
    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

    Jun 27, 2004
    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.

  5. SidBala macrumors 6502a

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

    Flynnstone macrumors 65816


    Feb 25, 2003
    Cold beer land
    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

    Jun 27, 2010
    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