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Virtual Memory Necessary?

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eccentric   11-16-2008 at 06:21:26 PM

With 4 GB of RAM nowadays and using a 32 bit Windows XP, does having a virtual memory page file even necessary? Will there also be a slight performance increase if I set the page file to like 20 MB or zero?

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dagger   11-16-2008 at 06:56:26 PM
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You have enough ram, turn off page file.

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Scarchunk   11-16-2008 at 07:36:56 PM
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You won't see a performance increase or decrease. I've tried it. Only issue is that a few apps from Adobe and others like to reserve paging file space even if they don't use it. So a few apps may complain but no biggie.

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aziraphale   11-16-2008 at 07:46:59 PM
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@ dagger

Wouldn't it be advisable to leave just a reasonable amount of VM available for just these very few instances, where some programs or maybe even win might need (want) it? Just to be sure to avoid strange problems?

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jitpublisher   11-16-2008 at 08:19:02 PM
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You can turn it off. But then there is really no reason to.
Windows is meant to have a page file, but you can go in and set it to like 20-50 meg if you want it to use minimal space.

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I   11-16-2008 at 08:23:31 PM
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Disable virtual memory then use system... if any apps complain, re-enable VM. There's no point in setting a very low amount of VM as an upper limit, if it's enabled then leave it 1GB or larger.

It is false that there is no reason not to disable VM if you can, because if it is enabled windows will allocate space to it, the system continually pauses waiting for the must slower disk subsystem to write out (even a few bytes of allocation that is never used is much slower than only waiting on real memory).

Windows is not "meant" to have virtual memory, virtual memory was just a feature allowing less-endowed systems to run more demanding applications, and a way to make it run, have sales for MS. It's a great feature to have if you need it, and a great feature to disable if you don't.

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Scarchunk   11-16-2008 at 08:31:42 PM
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I wrote :

It is false that there is no reason not to disable VM if you can, because if it is enabled windows will allocate space to it, the system continually pauses waiting for the must slower disk subsystem to write out (even a few bytes of allocation that is never used is much slower than only waiting on real memory).



I have 4GB of RAM and have ran benchmarks as well as running without a pagefile for extended periods. I noticed no performance increase or decrease. If you have a small amount of RAM you can increase performance by placing the pagefile on a separate disk from the OS, but that is only because you have a small amount of RAM and are actually using your pagefile. AFAIK if you have enough RAM, Windows will allocate, but not actually use a pagefile, thus no performance hit. Do you have any experience otherwise? However, I do set a static pagefile to avoid fragmenting.

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mikrev007   11-17-2008 at 09:31:14 AM
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Scarchunk wrote :

Only issue is that a few apps from Adobe and others like to reserve paging file space even if they don't use it. So a few apps may complain but no biggie.



An application cannot directly allocate space in the paging file. It a allocate memory, and that memory will be backed by physical ram or the paging file (controlled by the memory manager), the app doesn't care about it.

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Scarchunk   11-17-2008 at 04:46:10 PM
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mikrev007 wrote :

An application cannot directly allocate space in the paging file. It a allocate memory, and that memory will be backed by physical ram or the paging file (controlled by the memory manager), the app doesn't care about it.



I'm not sure of the technical reasoning behind it, all I know is that if you install, for instance, Photoshop without a pagefile enabled the app will complain about it. No big deal, but worth noting that some apps are "pagefile aware" and like to have one for whatever reason.

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mikrev007   11-17-2008 at 07:17:34 PM
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Photoshop knows it uses a lot of memory, and knows that if the user has no paging file, the system might run out of memory. The app can check if one exists, but that it all

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