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Re: VM figures [message #39753 is a reply to message #39752] |
Wed, 27 February 2013 15:51 |
Dan
Messages: 89 Registered: April 2008
Karma: 0
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At 8:28 PM +0000 02/27/2013, geraldcornish wrote:
> Just looking for clarification about virtual memory.
>
> Mac OS 10.4.11, Pismo with 1GB memory
>
> Right now I have Activity monitor saying VM size is 8.11 GB but
> Terminal ls command shows only two 1GB vm swapfiles. Why is there
> this discrepancy?
The swap files hold only *dirty* pages. Those are r/w pages that
have been written. When paged out, their contents are saved in the
swap file. Clean pages (r/o, r/w but unused) are simply deleted when
paged out. When needed again, they are re-obtained from their
original source, eg code in an app or framework.
HTH,
- Dan.
--
- Psychoceramic Emeritus; South Jersey, USA, Earth.
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Re: VM figures [message #39799 is a reply to message #39753] |
Thu, 28 February 2013 04:52 |
geraldcornish
Messages: 39 Registered: August 2012
Karma: 0
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Thanks for the explanation Dan, it makes sense now.
Ged
On 27 /02/ 2013, at 20:51, Dan wrote:
> At 8:28 PM +0000 02/27/2013, geraldcornish wrote:
>> Just looking for clarification about virtual memory.
>>
>> Mac OS 10.4.11, Pismo with 1GB memory
>>
>> Right now I have Activity monitor saying VM size is 8.11 GB but
>> Terminal ls command shows only two 1GB vm swapfiles. Why is there
>> this discrepancy?
>
> The swap files hold only *dirty* pages. Those are r/w pages that
> have been written. When paged out, their contents are saved in the
> swap file. Clean pages (r/o, r/w but unused) are simply deleted
> when paged out. When needed again, they are re-obtained from their
> original source, eg code in an app or framework.
>
> HTH,
> - Dan.
> --
> - Psychoceramic Emeritus; South Jersey, USA, Earth.
>
> --
> --
> You received this message because you are a member of G-Group, a
> group for those using G3, G4, and G5 desktop Macs - with a
> particular focus on Power Macs.
> The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our
> netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml
> To post to this group, send email to g3-5-list@googlegroups.com
> For more options, visit this group at http://groups.google.com/
> group/g3-5-list
>
> --- You received this message because you are subscribed to the
> Google Groups "G-Group" group.
> To unsubscribe from this group and stop receiving emails from it,
> send an email to g3-5-list+unsubscribe@googlegroups.com.
> For more options, visit https://groups.google.com/groups/opt_out.
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>
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