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Author Topic: Virtual Memory?  (Read 1482 times)

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Offline Kie99

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Virtual Memory?
on: December 19, 2004, 03:12:25 pm
What does it do, I know it says windows uses it as RAM but is it as good as RAM, i.e. if I had a PC with 128mb of RAM and I changed my virtual memory to 896MB would that give me the same performance as someone with 1024MB of RAM not using any virtual memory, given equal system specs apart from RAM
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Offline Sandwich

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Virtual Memory?
Reply #1 on: December 19, 2004, 03:21:36 pm
Nope. Virtual Memory is just using hard disk space as memory, with all the inherent slowness that comes with it.
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Offline MatthewPapa

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Virtual Memory?
Reply #2 on: December 19, 2004, 03:58:03 pm
It is essential to be able to run Fsopen with some options if you dont have much ram I have found. I keep at least 2000 mb win my system at all times.
 

Offline Clave

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Virtual Memory?
Reply #3 on: December 19, 2004, 05:07:44 pm
Virtual memory is an abomination.  

Maybe when RAM was expensive and slots were few, then it could be excused, but now, when you have 8 slots with 256MB in each, or a gig in each if you have extra cash, what is the reason to continue with VM?.....
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Offline Stealth

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Virtual Memory?
Reply #4 on: December 19, 2004, 05:08:56 pm
... because you can.
 

Offline Taristin

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Virtual Memory?
Reply #5 on: December 19, 2004, 05:10:30 pm
Quote
Originally posted by Clave
Virtual memory is an abomination.  

Maybe when RAM was expensive and slots were few, then it could be excused, but now, when you have 8 slots with 256MB in each, or a gig in each if you have extra cash, what is the reason to continue with VM?.....


Err... you're the only one with 8 RAM slots :p

My PC only has 3 RAM slots, and my parents have only 2...
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Offline Unknown Target

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Virtual Memory?
Reply #6 on: December 19, 2004, 05:26:10 pm
Mine has 3 slots of RAM and I only have 256 Megs of it :D
 

Offline Taristin

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Virtual Memory?
Reply #7 on: December 19, 2004, 05:46:25 pm
I still have one open slot...
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Offline diamondgeezer

Virtual Memory?
Reply #8 on: December 19, 2004, 06:04:05 pm
Ph34r my 1.25GB of memory

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Offline vyper

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Virtual Memory?
Reply #9 on: December 19, 2004, 06:17:20 pm
Virtual Memory is required because you'll never have such a thing as enough RAM - it's impossible to have enough physical memory for every possible load configuration. Example:
Your memory = 256MB. Memory load = 240MB (hell knows how) then you launch an application which adds about 120MB (say a 3D modeller) to the memory load. If you don't have any VM to put the overflow into, you get a million access violations and then a complete crash. Bye bye everything.
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Offline Kamikaze

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Virtual Memory?
Reply #10 on: December 19, 2004, 06:34:40 pm
Virtual memory is, in more efficient operating systems, used to keep stuff that won't be used for a while.

For example, if I'm playing a game I don't want my browser or IRC client in RAM. I want my game to get all the resources.

If I'm running a huge compile I don't want other applications wasting RAM.

This is why when you're running very resource intensive applications and then quit and switch over to other applications they seem to be stuck or very slow until the paged stuff comes back to RAM.

If you don't like the slowness you get from virtual memory you can reduce it and force the operating system to swap less. This means you'll get overall worse performance though (though GUI applications might feel a bit snappier).
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Offline Kosh

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Virtual Memory?
Reply #11 on: December 20, 2004, 02:21:04 am
Quote
Originally posted by Clave
Virtual memory is an abomination.  

Maybe when RAM was expensive and slots were few, then it could be excused, but now, when you have 8 slots with 256MB in each, or a gig in each if you have extra cash, what is the reason to continue with VM?.....



Because not all of us do. My laptop has 384 MB of RAM and my desktop has 256 MB. I could not play FSO without virtual memory. They won't do away with it because they need that kind of flexibility.



And a system board with 8 slots sounds quite a bit more like a high end server board to me. I've seen $150+ desktop boards that only have 4 slots. :p

Windows will only use your virtual memory when it has to as I understand it.
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Offline Clave

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Virtual Memory?
Reply #12 on: December 20, 2004, 07:44:34 am
It's a G5, and yeah, it does use virtual memory - I'm using the G4 at the office right now, so here are the settings for that:  (Only 4 slots)

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Offline Kie99

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Virtual Memory?
Reply #13 on: December 20, 2004, 01:06:45 pm
SO any yes or no answers
BTW I have 40GB of VM and 512MB of RAM
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Offline aldo_14

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Virtual Memory?
Reply #14 on: December 20, 2004, 01:29:59 pm
No, your performance with VM would be nowhere near as good as someone with the equivalent amount RAM.
 

Offline Clave

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Virtual Memory?
Reply #15 on: December 20, 2004, 03:40:05 pm
Yep..

For example take EDO RAM with a 50nS access speed, and a 7,200rpm HD with 15mS access time.

Your speed differential is about 300,000:1 - basically your memory will have done 300,000 things by the time your HD has done one.

It's slow, very slow....
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Offline diamondgeezer

Virtual Memory?
Reply #16 on: December 20, 2004, 04:30:37 pm
Remind me, wise man say virtual RAM should be set to same size as physical RAM yesno

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Offline vyper

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Virtual Memory?
Reply #17 on: December 20, 2004, 04:34:24 pm
Should be twice physical ram size... or something like that.
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Offline Clave

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Virtual Memory?
Reply #18 on: December 20, 2004, 04:51:28 pm
Just let your OS manage it, that usually works.  

Something like 'recommended settings'  ??  

I don't use Windows much....
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Offline diamondgeezer

Virtual Memory?
Reply #19 on: December 20, 2004, 05:08:33 pm
Let Windows manage itself? Surely you jest...

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