How Windows uses physical memory
in [Device Drivers]
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From: Thomas on 21 May 2008 20:48 I'm trying to settle a debate with someone about how Windows (32bit) allocates memory. In short, my opponent seems to think that ALL applications will be swapped in and out of the SAME 2 GB of *physical* memory. I suggested that this was nonsense and instead the OS will use whatever physical memory it has available. Thus, in theory, if you have a 4 GB system with no swap file, you could run three applications that take 1 GB assuming that the OS is consuming no more than 1 GB. Can I get an engineer at Microsoft to confirm that this is how it works and if so, can I get a link that outlines that architecture?
From: Tim Roberts on 22 May 2008 01:52 Thomas <Thomas(a)discussions.microsoft.com> wrote: > >I'm trying to settle a debate with someone about how Windows (32bit) >allocates memory. In short, my opponent seems to think that ALL applications >will be swapped in and out of the SAME 2 GB of *physical* memory. I suggested >that this was nonsense... It is nonsense. The system does not partition physical space. Pages are assigned as needed. >...and instead the OS will use whatever physical memory >it has available. Thus, in theory, if you have a 4 GB system with no swap >file, you could run three applications that take 1 GB assuming that the OS is >consuming no more than 1 GB. Right. >Can I get an engineer at Microsoft to confirm >that this is how it works and if so, can I get a link that outlines that >architecture? Nope. However, this is fundamental to all virtual memory architectures. It is not specific to Windows. -- Tim Roberts, timr(a)probo.com Providenza & Boekelheide, Inc.
From: Leo Havmøller on 22 May 2008 03:28 > I'm trying to settle a debate with someone about how Windows (32bit) > allocates memory. About virtual memory: http://en.wikipedia.org/wiki/Virtual_memory The Virtual-Memory Manager in Windows NT: http://msdn.microsoft.com/en-us/library/ms810616.aspx Leo Havmøller.
From: Thomas on 22 May 2008 11:07 Thanks Leo! "Leo Havmøller" wrote: > > I'm trying to settle a debate with someone about how Windows (32bit) > > allocates memory. > > About virtual memory: > http://en.wikipedia.org/wiki/Virtual_memory > > The Virtual-Memory Manager in Windows NT: > http://msdn.microsoft.com/en-us/library/ms810616.aspx > > Leo Havmøller. >
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