Virtual memory is a technique to provide more address space than the available physical memory. Each process can be given its own virtual memory, and the hardware translates every virtual memory reference to a physical memory address. To accommodate situations when more virtual memory is in use ...

learn more… | top users | synonyms

2
votes
2answers
11k views

what differences and relations are between logical and virtual memory?

I was wondering what differences and relations are between logical and virtual memory? How do their purposes differ? Are the relations and differences the same for logical and virtual addresses?
0
votes
0answers
11 views

Calculating average working set size

Say I want to calculate the average working set size (WSS) of this reference page string considering that the window size, delta = 3 : 1 2 310 (1 3)5 2 3 (2 4 1)10 5 5 1 1 1 2 2 5 (5 2)5 1 2 I ...
-2
votes
3answers
21 views

What size for Virtual Memory [duplicate]

I am a total novice when it comes to hardware settings. I am using Windows Server 2012 64 Bit. It has 12GB RAM. I have a C and virtual D drive. The build is i5-2400 3.10 GHz. There is no current ...
48
votes
8answers
7k views

Should I disable swap file if I have lots of RAM or should I move it to a virtual RAM drive?

Imagine I have tons of RAM. Let's say 64GB. That's a lot for even gaming PCs. Now the default location of a pagefile in Windows is on the main OS drive, be it HDD or SSD, which are faster in general, ...
1
vote
1answer
36 views

Windows 8 Automatic Page File Size vs Windows 7

I've noticed that Windows 8 sets smaller page files by default. Windows 7 systems seem to create a page file the size of the RAM (eg 4GB of RAM means that Windows makes a 4GB page file). In Windows 8 ...
13
votes
6answers
6k views

What is virtual memory?

I was double checking my notes for 'Virtual Memory' and the definition in my text book is: Process of allocating a section of secondary storage to act as part of the main memory Where as ...
-1
votes
1answer
396 views

Will a swap file not slow down the system so much if a Solid State Drive is used?

When RAM runs out on a computer, the swap file is used, and then the system can become quite slow. But if the notebook or desktop is using SSD nowadays, will it be less of a concern? (Updated Oct ...
7
votes
3answers
22k views

What are the dangers of manually setting IncreaseUserVA?

I run visual studio 2010 on a 32bit system and regularly run into issues with running out of virtual memory so I can no longer do things like copy / paste in VS. I checked out a few options and the ...
1
vote
1answer
56 views

All memory go's to “Standby” and no memory left on “Free” issue (Win 8.1)

Problem on my win 8.1 the memory does not go's to free memory when another apps or game are on..it is causing my pc work extrimly slow even when it says 13GB available..what should i do? (All forms i ...
0
votes
1answer
121 views

TLB access in SMT processors

In SMT (simultaneous multithreading) processors in which threads share the TLB, how does the TLB differentiate one thread's access from the other one? Each thread has its own set of pages loaded into ...
1
vote
1answer
39 views

Is there a way to choose which applications go to virtual memory?

The way I understand virtual memory is that when an application is not being used for a period of time, the memory being used gets written to disk. When I use an application (netbeans), it seems to be ...
-1
votes
1answer
154 views

How can I use a flash drive to increase my virtual memory?

My computer has 8gb of physical memory. I'm running some memory intensive processes that quickly eat up that 8gb. When the physical memory runs out, it starts using the virtual memory and I see ...
1
vote
4answers
1k views

Force a process to run in virtual memory? Ubuntu

I am running a series of tests for an implementation of a remote pager that sends page faults to other computers in a network. Long story short, I was wondering if there is an easy way to force a ...
1
vote
1answer
26 views

Open programs take forever to reload after another program used-up all the memory

I have the following phenomena: I have 4GB RAM, and sometimes I use a program (program A) which uses up all the available memory, say 3.9GB. If there are more open programs, then their memory is ...
11
votes
5answers
2k views

How much swap is a given Mac application using?

Is there any way to tell whether a particular application running on Mac OSX (10.2+) has some of its memory swapped out (i.e., to one of the /private/var/vm/swapfile* files)? And how much? Bounty ...
5
votes
2answers
487 views

What is the difference between virtual memory and built-in memory (RAM)?

I allocated ~24GB of my hard-drive as "virtual memory" -- what I understand to be extra space that the computer can use as RAM. My system has 8GB RAM built in, so my assumption is that I'm pumping a ...
0
votes
0answers
88 views

Recommended paging file size formula

Is there a formula by which Windows calculates recommended paging file size? (see picture). This is definitely not 1,5 x RAM (this PC has 8 GB or RAM). I need to implement this calculation in my ...
2
votes
1answer
28 views

How big are copy on write pages in linux?

We used RHEL 5.8 at my office. Our program relies on fork for parallelism. The application is very memory hungry (up to hundreds of GB) so we're relying on copy-on-write functionality to make this ...
0
votes
3answers
95 views

How to increase swap memory in Windows? [duplicate]

I bought a new system with 4 GB of RAM. I don't know how do I check how much swap memory I have allocated. I know that we can increase RAM physically. I want to increase swap memory on windows. How ...
2
votes
2answers
86 views

Should I/Need I set the virtual memory on system parition or not?

I have a single drive(500Gb) divided into 2 partitions C:(98 Gb, system partition) and D:(368 Gb). Where should I set my virtual memory(manual input) ? Do need I to set it on system partition to ...
0
votes
1answer
47 views

Why memory can't be collected cleanly after a process terminats?

After long time running, computers always become slow. Rebooting generally make them faster. But how does this happen? Initally I thought this might be related to memory usage. But recently I learned ...
1
vote
3answers
1k views

Windows application to monitor virtual memory activity

Is there a windows application that shows a graphical representation of virtual memoey, along with which pages are resident, which are being moved in or out, and so on. What I"m looking for is some ...
12
votes
2answers
6k views

Commit charge is 100% full but physical memory is just 60% when using no page file

I have disabled the page file in my system (hard disk is too slow, cannot buy a new one right away, cannot move page file to another partition). When I see into Resource Monitor, using memory ...
1
vote
1answer
723 views

Why does Windows always use as much Virtual Memory as there is RAM installed?

And why does it want to have a maximum of twice as much of that amount? My System has 32GB of RAM and Windows, by default, sets a minimum of 16MB Virtual Memory, allocated 32GB(!) and recommends ...
0
votes
0answers
235 views

What is the exact difference between the parameters (pgpgin, pswpin) and (pswpout, pgpgout) in /proc/vmstat?

Please note that this question is specific to linux only. And by swap space, I mean the dedicated swap partition. I did google a bit on this, and found these definitions: Paging refers to writing ...
1
vote
3answers
3k views

Disable virtual memory in Windows 8 is good?

I have an ultrabook hybrid with a SSD (mSata) and HDD working with intel rapid storage and my PC has 6 GB of ram. So I want to know if I can disable virtual memory and what other things should I do to ...
1
vote
0answers
46 views

How can I see the correct “private bytes” value in process explorer?

I have a process that intentionally uses large amounts of memory. When I view this process in Process Explorer's list view with all memory-related columns enabled, this is what I see: Note that all ...
0
votes
0answers
33 views

Cannot start site on IIS-Express

Some background: I Am developing a website that uses a BI layer that relays on Matlab. In order to make the logic layer available across my site I am creating it when the site starts (in ...
0
votes
1answer
1k views

Top command cache vs free memory

When I am running top command (on embedded system with 64 MB RAM) I am getting below description on total memory usage: "Mem: 43468K used, 968K free, 0K shrd, 1280K buff, 21896K cached" It looks ...
1
vote
4answers
3k views

Will allocating too much virtual memory have any negative effect on your laptop?

Like will it slow down your boot-up? Also what problems will arise if you allocate more hard drive memory for virtual memory than what is available, will that cause any issues?
1
vote
3answers
365 views

Do I need Readyboost and page file if I have lots of free RAM?

I have 12 GB RAM installed in my laptop. I have currently both page file and ready boost disabled. Most of the time my RAM usage are under 6 GB. So, I still have 6 GB RAM all the time. Considering ...
0
votes
1answer
2k views

How to increase Virtual Machine disk space?

I am trying to increase the available disk space of the VM, but no use, tried many things written here and on other websites, mainly saying that this is possible through the Virtual Media Manager , I ...
1
vote
0answers
73 views

Virtually Indexed Physically Tagged Cache

I have been going through the four types of data cache used in virtual memory, I came across this problem and I could not solve it. Consider a Virtual Memory system with 20-bit virtual byte address, ...
1
vote
1answer
86 views

How to know the size of page frame used by my OS?

How to know the size of page frame used by my OS ? This could be useful for some optimizations when I code. (Allocate big buffer that fit in a page frame for example). Page frame is determined by ...
0
votes
1answer
27 views

what is a word-length boundary?

I'm reading this article: http://en.wikipedia.org/wiki/Struct_%28C_programming_language%29 And it states the following: "The C struct directly corresponds to the Assembly Language data type of the ...
0
votes
0answers
86 views

Windows 8 will not boot after set virtual memory to 9999MB

To increase the performance of an ASUS X551M I increased the virtual memory 9999MB. In the past I would determine the max available virtual memory by typing in 9999. I expected to see something like ...
11
votes
6answers
3k views

Do I still need to use virtual memory?

I would have thought this was already asked but I can't seem to find it. At what point do I no longer need virtual memory enabled? With 4GB of RAM I see that the computer rarely uses anywhere near ...
0
votes
1answer
229 views

I want to increase the swappiness in my windows 7

as I have 60% RAM usage every time. I have already increased Virtual Memory (Increased Swap Size) but want to increase swappiness too. see my RAM usage:
0
votes
0answers
28 views

Prevent a closed source chosen process from swapping on Windows [duplicate]

When I run VirtualBox If I don't use VirtualBox for some time and then I come back to using it the virtual machine runs very slowly, obliviously all subsequent operation go enough fast. How I can ...
1
vote
0answers
81 views

Windows tells me there isn't enough memory and asks to close Firefox, but why this actually happens is unclear

My system has 4GB of physical memory, and a system managed paging file on an SSD. It seems like the paging file's size is capped to 12GB for a total of 16GB memory, which should be more than enough, ...
0
votes
1answer
72 views

Is CPU cache (L1 - Ln) equal to TLB

If we are talking about CPU cache. Is Ln synonym for saying 'TLB (translation lookaside buffer) of type Ln' or does Ln include also somethin else than just TLB?
0
votes
0answers
15 views

Hardware support of windows 7

To accomplish the mapping of process memory, perhaps virtual, hardware support is often used. This is normally done via process base registers. The windows 7 operating system may also need base ...
0
votes
0answers
19 views

Why was overlaying suppose to be done by the programmer?

I was reading about OS memory organization, and the first entry in the Virtual Memory(VM) chapter refers to overlaying and how when it was used at a large scale (up to the 60s) the process memory ...
0
votes
0answers
36 views

virtual memory view in windows server 2008

AFAIK, Task Manager in windows 2008 shows the physical memory. I have a program that sums up the FREE physical & FREE virtual memory in MG. How can I confirm it has the right output of this sum? ...
0
votes
1answer
246 views

Windows - How can I flush modified memory?

This is a follow up on my previous question, here: Windows modified memory without a pagefile - Super User I have no pagefile and a lot of modified memory according to resource monitor (Win 7 x64). ...
0
votes
1answer
111 views

Windows modified memory without a pagefile

How does Windows' modified memory work without a pagefile? The physical memory is modified and then...? I'm running Windows 7 with 16GB of RAM and no pagefile. I have about 2.5GB of modified memory, ...
2
votes
2answers
2k views

Why does increasing Virtual Memory not helping game performance? [closed]

My RAM has a pathetic 2GB and most of my applications and background services take up at least 25% to 35% of it and thus causing the game to be laggy and all. I've tried adding virtual memory, from ...
1
vote
1answer
636 views

Changing virtual memory using batch

I am making a program using batch to boost pc performance and I have now come to the stage where I need to edit windows virtual memory to a size that I can change in the code. if needed it can be done ...
0
votes
5answers
216 views

Why aren't all the disks contents in virtual memory?

For simplification let's only talk about hard disks and RAM. In a nut shell, virtual memory is when "memory addresses used by a program.. [are mapped] into physical addresses in computer memory". By ...
8
votes
2answers
11k views

How to suppress “low memory” warnings in Vista Home Premium when running without paging file?

A few weeks ago I disabled all paging files on my Media Center. I figured that it only ever runs AVG, Media Center, Logmein, Chrome and sundry services to support these and never gets above 1.4-1.5GB ...