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VM figures [message #39752] Wed, 27 February 2013 15:28 Go to next message
geraldcornish is currently offline  geraldcornish
Messages: 39
Registered: August 2012
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Hi

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?

It seems odd to me and I wonder if I'm missing something important
about vm & swapfiles.

Ged

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Re: VM figures [message #39753 is a reply to message #39752] Wed, 27 February 2013 15:51 Go to previous messageGo to next message
Dan is currently offline  Dan
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Registered: April 2008
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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 Go to previous message
geraldcornish is currently offline  geraldcornish
Messages: 39
Registered: August 2012
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Member
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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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
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For more options, visit this group at http://groups.google.com/group/g3-5-list

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