page file in RAM only

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Re: page file in RAM only

Postby support » Thu Feb 04, 2010 12:13 pm

We did a further test on XP sp3

It seems that the order of paging files to be increased is determined by their order in the "Pagingfiles" value at registry
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\SessionManager\MemoryManagement

Continue with the previous post and let's say two paging files
(harddisk) C:\pagefile.sys 20MB~1000MB
(ramdisk) Z:\pagefile.sys 500MB~1000MB

The "Pagingfiles" value will be
C:\pagefile.sys 20 1000
Z:\pagefile.sys 500 1000

The first one to be increased shall be C:\pagefile.sys when the initial 520MB is used up.

If we change the order to
Z:\pagefile.sys 500 1000
C:\pagefile.sys 20 1000

Then the first one to be increased will be Z:\pagefile.sys

Of course, as jer1956 said, System Tab control always restores the order. To prevent this, you may try the method as jmatwyko provided.
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Re: page file in RAM only

Postby SlimShaggy » Thu Jun 21, 2012 7:54 am

support wrote:The first one to be increased shall be C:\pagefile.sys when the initial 520MB is used up.

This doesn't seem to be exactly the case. I tried to test the pagefile usage by starting a lot of applications in the following configuration:
RAM: 4096 MB;
OS: Windows XP SP3 32 bit;
Paging files:
C: 16 - 4092 MB (physical disk);
Z: 720 - 762 MB (RAM disk using IM).
When the pagefile on C: increased to 900 MB, only 150 MB of the pagefile on Z: and 50 MB on C: were used. So it looks like Windows starts increasing the paging files well in advance, when they still very far from filling up.
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Re: page file in RAM only

Postby support » Fri Jun 22, 2012 12:22 am

Did you change the order in the registry to
Z: 720 - 762 MB (RAM disk using IM)
C: 16 - 4092 MB (physical disk)
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