Apr 20

When your computer is running a bit slowly, how can you tell if getting more memory will help?  The short answer is that if you have little or no ‘free memory’ or if your ‘page-out’ count is high, then you need more RAM. Here’s how to check those two things on any Macintosh running OS X.

  1. Go to your Applications/Utilities folder. (Click on your desktop so that the finder is active then hold down Apple-Shift-U, this will open your ‘utilities folder.)
  2. Open ‘Activity Monitor’ – it will probably be the top-most application in the Utilities Folder.
  3. Press Apple-1 to make sure that the main window of Utility Monitor is open.
  4. Click on the ‘System Memory’ tab at the bottom of the window. This will display a little pie graph of how much memory you are currently using. It will look something like this:

There are two important items to take note of ‘Free:’ and ‘Page outs:’

Free tells you how much free memory you currently have available to use –  the higher the better.  If you have no free memory you should get more RAM.

A Page out  means your computer has run out of memory and had to use some of the Hard Disk instead of RAM. (This is the equivalent of your brain being too full so you have to write your thoughts down on paper to free up some headspace) This DRAMATICALLY slows down your computer.

To quote from Apple:

Moving data from physical memory to disk is called paging out (or swapping out); moving data from disk to physical memory is called paging in (or swapping in)… Extended periods of paging activity reduce performance significantly; such activity is sometimes called disk thrashing.

Tip: Page outs occur when your Mac has to write information from RAM to the hard drive (because RAM is full).  Adding more RAM may reduce page outs.

 

Some Examples:

Here’s a mac with plenty of RAM (12G) – lots of Free RAM (green) and zero Page outs.

Here’s a mac with just enough RAM (8G) – a relatively little Page out Count (339MB) and some free memory (green).

Here’s a Mac that needs more RAM (it only has 640M!) – note the High Page Out Count (1010524) even though it currently has some ‘free’ RAM.

This Mac definitely needs some more RAM! Practically no free memory  AND High Page-out Count. (1GB!)  Performance will be suffering badly. I would add at least another 4G Ram, maybe 8G more to bring it up to 12G.

In OSX Leopard rather than giving a ‘count’ of page in and page outs, it gives a size in GB  of the amount of RAM that has been paged in or out. The numbers are smaller but the same principals apply.

In OSX Lion there is a new entry called ‘Swap Used’. (See the last picture above). This  is a count of how much Disk Space your computer is using as RAM and it’s a good rough estimate of the minimum amount of  extra RAM you need. Eg If your Swap used is 4G then get AT LEAST 4G more RAM.

Where to buy more RAM.

If you do need more memory  I recommend buying it from Crucial. They have good prices and reliable RAM. I’m in Australia and it usually arrives in about a week. They have a great memory lookup tool for all Apple Computers where you choose your model and it shows you exactly what memory you need.  The memory chooser tool looks like this:

First choose ‘Apple’ where it says ‘Choose Manufacturer’

Secondly select your mac when it says ‘select product line’ (e.g. iMac or Macbook etc)

Finally select the exact model (e.g. Early 2011 i7 27″ iMac”)

It will then show you the options you can buy.

 

Note (Jan 2013): I have signed up as a Crucial affiliate partner.

Click here and I get 2% commission!

112 Responses to “Does my mac need more memory?”

  1. wayne says:

    I just received this by email,
    look at how high the page in/out count it!

    Glen.jpg

    Time for memory upgrade!

    • HaWook says:

      My Page ins and Page outs are expressed in megabytes (960 and 325, respectively). How can I figure out the actual number?

      Please and thank you.

    • Andrew says:

      The blue section reads ‘Inactive’ for a reason. A program has claimed it, but is not using it. Your mac should page these out because it is essentially empty space. Windows does this as well, its called scrubbing.

      Want proof, go to the apple store and run Activity monitor on one of the showroom macs. There will be tons of page outs despite the fact these macs only have the programs that come with your mac (and your mac was designed to handle without slow downs).

      This is Apple marketing bull trying to make you pay $400 for overpriced RAM. Get iFreeMem and see what I mean, this will page out all inactive memory, essentially turning all your blue memory green and speeding up your Mac.

      • Anna says:

        Thank you Andrew. I’ve had a ‘start up disk almost full message’ for the last few days, and my laptop is very slow opening things. Yesterday it couldn’t start and showed a flashing question mark instead. I’ve got it started & running now (with help from the installation CD), but that was a great worry and wonder if the lack of space is stuffing up hard disk (=startup disk) somehow.

        I’ve got somewhere between 8 and 45 MB free memory on System Memory in Activity Monitor, fluctuating up and down. I’ve got about 233 MB inactive memory, and the pages out is slowly climbing up, currently about 420 MB. In disk usage I’ve got about 12 GB free and about 99 GB utilised.

        So I wonder if paging out the inactive memory can help, I’ll give iFreeMem a try.

        Ps. I can see that the Chrome browser appears to occupy a massive amount of working memory, does anyone else have that experience?
        It does also frequently crash, which could be because I am in the habit of having too many tabs open at once.

      • Anna says:

        Follow up: I downloaded and ran iFreeMem. It doesn’t make a difference and doesn’t tell me anything that Activity Monitor doesn’t already show. Also, it is just a 15 days trial of a paid product and whenever you start it up you have to select to ‘continue trialling’ – slightly annoying.

        Re. the inactive memory, I found below in another forum:

        “don’t worry about that “inactive” ram, that’s as good as “free”. it means that osx has at some point loaded something in the ram and later on decided that it is no longer needed. of course the ram could be “freed” (completely) but unix systems have made such a decision that the content is kept in the memory in case it is needed in the future. but because that memory is flagged as “inactive”, it can be deleted as soon as some other app needs to have that memory. so it is just one kind of an optimization- .” –
        ( JFreak in http://forums.macrumors.com/showthread.php?t=73631 )

        Makes sense.

      • Rod says:

        Operating systems (not only Unix systems such as OS X) currently cannot return RAM to the system pool, where it can be used by an application, until the application is exited. I’m not sure of the reason for this, but it appears to be a technical one.

        When an app needs more RAM, it first looks in its own pool, that is, RAM it used and released. If it doesn’t find enough RAM, it takes more from the system pool.

        This means an app ties up the maximum amount of RAM it has needed since it last opened. If you’re running out RAM, exit and re-enter the app(s) that are using the most. It’s also wise to avoid opening too many documents in the same app. I have a friend who opens 20 or more tabs in Firefox and never closes one when he’s done with it.

  2. Patrick says:

    I was googling around to see what excessive paging was as I was worried my mac was on the high side. After 1 day my Page in/outs are at 1376201/486790. Time for a MacPro since I’m already at the 2GB limit on my CD iMac. *Yikes*

  3. Brent says:

    Well my page ins/outs count is also very high along with having only 18MB of free memory. I had running Finder, Firefox, Microsoft Word, Preview, Safari, and Activity Monitor. I tried closing Word, Preview, and Safari and now it is up to around 180MB free. Now my question is this…lately I’ve been having slow-downs alot and my computer will freeze for a few seconds and I get the beachball. This happens even after a reboot with only Firefox (and sometimes one more program open). Should I get more memory? If so, how do I know what kind to get. I’m a newbie to the MacBook and OSX.

    Thanks!

  4. admin says:

    If it is slow straight after a reboot, and there are no page ins, and there is lots of free memory still, then the slow-down is probably not a memory problem, unless you have Leopard, it needs lots of memory, like 2 Gig at least.

  5. stuart says:

    Hello,

    I have also been noticing that my computer lately, slows down alot. Usually, I run Mail, iTunes, Safari, Newsfire, Adium and maybe sometimes transmission. I notice that my page in’s and out’s are quite high. Just yesterday it was the highest that I have ever seen. Today I rebooted and immediately after reboot my page ins were 45,023.

    I am at a loss on what to do. Alot of times my page outs exceed my page ins after a day of running.

    Please help

  6. stuart says:

    Hello again, I just wanted to give an update. I rebooted last night before I went to bed. Again right after start up I has an extreme amount of page in’s. Similar to my above comment. Now less the 16hrs later I now have this
    Swap 2.01GB(3.00GB)
    Page in: 157,558
    Page out: 273,764

    I really am having a hard time grasping what is actually wrong since I have not had this problem until just recently. My warranty is not yet finished for my iMac.

    Please help shed a light on this for me.

    Kind regards,

    Stuart

  7. Drew says:

    @ Stuart,
    If your mac is restarted & not running any apps and you are getting page ins/outs make sure there are no applications running in the background such as iTunes helper, iCal helper menu items dashboard widgets third party apps…
    They should be listed in the activity monitor window.

    It could just be the load that the OS places on your system. You may need more RAM, just keep an eye on the amount of paging and contact Applecare if it concerns you. You don’t say what version of Mac OS or the amount of RAM you have, but more should help. 2 – 4 GB should keep it running smoothly for basic tasks.

    PS the Leopard Activity Monitor specifies the paging in MB/GB units, Im unsure if the units are Kb, MB or GB in your comment.

    Nice article, it helps clarify what is going on with memory.

  8. admin says:

    Stuart,
    how much RAM do you have?
    Have you recently upgraded to Leopard?

    Wayne

  9. George says:

    MacBook (Generation 3)
    1GB RAM

    Free: 11.52MB
    Page in: 1218997
    Page Out: 736528

    Page in/Page out are increasing when I went to a website on FireFox.

    Applications in use:

    FireFox
    Safari
    Microsoft Word
    Mail
    Activity Monitor
    Grab
    Preview

    I also use a lot of Photoshop, iMovie and iPhoto.

    For me, it always seems like FireFox that is creating the whole mess. But I need it because of it’s tools that Safari doesnt have.

    But my main question is obviously, Do I Need More RAM??

  10. sarah says:

    My computer is super slow! My page in/outs are: 74840/25909 and ‘ins’ keep going up. Also the Free is 80 MBs. I just rebooted too? Reboot again? I was just running word and excel and I’m soooo frustrated.

  11. Ben D. says:

    “Free tells you how much free memory you currently have, the higher the better”.

    Actually you should never expect “free” to be high. See this article from Apple for more information: http://support.apple.com/kb/HT1342?viewlocale=en_US

  12. Dunwell says:

    recently, I deleted some file and my ibook G4 wouldnt boot. I rebooted it with “Leopard” (it was Tiger before). now it is so slow I have towait onit to open some firefox pages. It is even doing things I didnt comand it to do.
    I have 512ram 1.33 processor and 60G HD. what can I do?
    Dunwell

  13. juelz says:

    I am confused because from your comments it seems as if my system isn’t doing what it is supposed to- my page in is 258.08 and increasing but my page outs is 0 and swap used is 0- is this good or bad? I have 1.04 memory used out of 2 GB but it seems as if an update im trying t o get for my microsoft office is not letting me download because of lack of memory. I am quite confused at this point

    • Athena says:

      Page ins SHOULD increase with every file you open – they occur when data is loaded into RAM.

      Page outs occur when you run out of RAM to be used.

      If your page outs are 0, that’s great! I’d say your download is failing for a reason other than RAM – perhaps hard drive space?

  14. bamakodaker says:

    I wonder if everyone is forgetting something very simple – what about HOW RAM is used? Is your desktop crowded with items using up that RAM? Keep everything IN your harddrive. ONLY have ALIAS’ on your desktop!~ Keep that RAM free.

  15. Aayush says:

    Hi,

    I have been noticing that my computer lately, slows down alot. Usually, I run Mail, iTunes, Safari/firefox (though safari makes it more slow), word and excel. I notice that my page in’s and out’s are quite high. Today I rebooted and immediately after reboot my page ins were 36,458.

    I am at a loss on what to do. Alot of times my page outs exceed my page ins after a day of running.

    I have a macbook 2.2Ghz core 2 duo with 1GB RAM and recently upgraded to snow leopard.

    I never faced this problem earlier, although i started having the problem in my leopard only thats why i upgraded to snow leopard.

    Please help

  16. Aayush says:

    will upgrade and try it out…………..thanks………….

  17. Eve says:

    Cheers for that, helped a lot.

  18. Zev says:

    my mac is slow i got 2 gigs of ram mostly use imovie ichat itunes and itenternet and windows,

  19. Nabeel Khan says:

    does anybody know what the conversion is for page ins & outs from Mb’s to just the large numbers you all have showing in your activity monitor?
    Mine shows the amount only in megabytes

    thanks

  20. HaWook says:

    My Page ins and Page outs are expressed in megabytes (960 and 325, respectively). How can I figure out the actual number?

  21. Roman says:

    Thanks for sharing, guys. Now I’m sure I need to upgrade with no doubts!

  22. charlie says:

    I have a imac osx 10.4.11 (so about 5 years old i think) it has a 2GHz intel core duo and a 1GB 667 MHz.

    When i run the folllowing I have 70MB free and 87660 page in and 43569 page out. Things get slow.

    firefox
    word
    photoshop
    finder
    macmail

    what im wondering is, is it worth me buying more memory or is my mac reaching the end of its life.i have been told by 2 people that they only have about 5 years in them.
    also if i move my iphoto library(and my lge amount of saved psd documents) onto an external then will this have any effect on the ram or is that totally seperate.
    any advice would be gteat.thankyou!!!

  23. Sanjay says:

    I liked the discussion here. My MAC is also 660 Mhz Intel dual core with 1 GB RAM. It has also gone very slow and I was thinking of upgrading to Snow leopard. It seems that is not the solution. My activity monitor shows just 7 GB free when just 4 programs are running (no video or iTunes) and also the page ins are 276 MB. Is this page on per session or year till date? One observation in activity monitor: pmtool and kernel_task (root) have sent more than a million messages (under messages sent). Anybody has any idea why?

  24. milo says:

    my g4 mac won’t even open the “activity monitor”! the icon pops up but disappears straight away. Doesn’t see the additional internal hard drive either ,not on the desktop. In the system profiler it appears ,but grey!

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