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 ...

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18 views

How does Windows deal with process memory or resource exhaustion?

The other day I was working on a Windows 7 32-bit PC, with a few applications running including Firefox. Over time I kept opening new tabs in Firefox until, suddenly, the Firefox window started ...
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0answers
17 views

How to set heap size (-Xmx) more than 1 gb in Windows 64 bit machine with 4gb ram?

I got the error as below: Error occurred during initialization of VM Could not reserve enough space for object heap Could not create the Java virtual machine. I can set maximum heap size 1gb. After ...
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2answers
22 views

High VIRT memory used by file manager

I'm using elementary OS and it's default file manager Files. I've noticed that after a while of usage, htop shows that pantheon-files (how the app is named) consumes over 10Gb of VIRT memory. This ...
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3answers
5k views

Disable virtual memory in Windows 8 is good? [duplicate]

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 ...
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3answers
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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 ...
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1answer
72 views

How do I know how much swap is used on Windows 7?

Apparently, as per Commit charge is 100% full but physical memory is just 60% when using no page file and http://brandonlive.com/2010/02/21/measuring-memory-usage-in-windows-7/, the Commit numbers in ...
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3answers
8k views

What are the benefits of Virtual Memory?

So I've been reading up on virtual memory and it all seems pretty straight-forward and practical. However, I'm choking on one major concept. If virtual memory is stored in main memory, then why even ...
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2answers
11k views

How to diagnose ballooning OS X kernel_task and wired memory usage?

I have a very strange issue, which I'm having a hard time diagnosing as to the root cause. I have a Mac Pro (2008, 8-core 2.8 GHz, 8800GT) with 14 GB of RAM (recently upgraded because of this ...
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1answer
698 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 ...
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0answers
78 views

Application to Automatically Free Modified Memory

Is there a Windows application or script that can free modified memory belonging to a given application. I have tried Flush File Cache which is great as a big ol' hammer to clean out all modified ...
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2answers
116 views

Does Windows reclaim RAM right after a process quits?

When we quit a process (e.g. using Task Manager etc), Does Windows reclaim the RAM used immediately? Or does Windows still retain the RAM used for that process?
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48 views

Size of page table and number of entries

Suppose on 32 bit OS, we have 4 GB of available virtual address space. So, that means we need to map 2^32 = 4,294,967,296 addresses. If you calculate the size to store all the 4,294,967,296 addresses ...
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2answers
191 views

Why does Windows 7 intentionally make itself slow?

I've encountered this oddity with 5 different machines, running different versions of Windows 7. I've seen the same issue in Home Premium, Professional and Ultimate. The System Allocates Less Virtual ...
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0answers
24 views

Is there a way to set a paging file on a folder-mounted volume in Windows 7?

I have a physical volume mounted to an NTFS folder in Windows 7 that I would like the system to use for paging. Is this possible and, if so, how do I enable it? Thanks in advance.
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3answers
1k views

Does it matter about the amount of the swap area in Linux system

Does it matter if the amount of a swap area in Linux was set too small (say 1Gb), and the main RAM is 128Gb? Should we always set the amount of swap area to be twice the amount of RAM? UPDATED: Hi, ...
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2answers
4k views

imDisk: Create physical memory drive (not virtual memory drive) from command-line

I'm using imDisk (http://www.ltr-data.se/opencode.html/#ImDisk) to create a virtual drive in Windows 7. I use it as temp drive for documents and will be created every time the computer/windows ...
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1answer
167 views

What does it mean to have a swap partition mounted at /dev/null?

I ran swapon -s on a VPS that I’m using and discovered that there’s a swap partition pointing at /dev/null. # swapon -s Filename Type Size Used Priority /dev/null partition ...
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11answers
16k 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, ...
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0answers
44 views

Windows 7 connected to LCD monitor (using HDMI cable) reports low virtual memory if left idle too long

My Windows 7 laptop that is connected to my LCD monitor using an HDMI cable often reports low virtual memory if left idle for more than an hour or so - if it is left in that state long enough, the ...
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0answers
134 views

Win8.1 Bad Virtual Memory Managment?

For the last couple weeks I'm facing a serious problem with my Win 8.1 32bit (64x CPU) 4G RAM, having "System Managed size" setting for virtual memory (then win allocates 1.8G), minimizing even light ...
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2answers
13k 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?
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0answers
43 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 ...
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3answers
36 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 ...
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1answer
107 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 ...
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6answers
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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 ...
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1answer
453 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 ...
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3answers
26k 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 ...
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1answer
214 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 ...
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1answer
132 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
42 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 ...
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votes
1answer
660 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 ...
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4answers
2k 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 ...
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1answer
31 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
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5answers
3k 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 ...
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2answers
750 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 ...
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0answers
175 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
33 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 ...
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3answers
124 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
139 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
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1answer
53 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 ...
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3answers
2k 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 ...
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1answer
2k 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 ...
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0answers
64 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 ...
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0answers
45 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 ...
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votes
1answer
2k 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 ...
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4answers
4k 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?
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2answers
504 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 ...
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1answer
8k 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 ...
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0answers
165 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, ...
2
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1answer
178 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 ...