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

1
vote
1answer
732 views

Page pool and cache memory

It is subtly mentioned on this article, that the page- and non-page pool, are used for contiguous memory allocations which are sub-page size. It then goes on to list the differences. I am not sure ...
1
vote
1answer
393 views

Is virtual memory related to virtual address space of a process?

I have understood that Paging is a memory management technique which allows computer to bring data from secondary storage to main memory for executing process. It gives an impression to process that ...
1
vote
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 ...
1
vote
3answers
3k views

tweak windows 7 virtual memory and cache / caching settings

im on windows 7 64 bit, with 4gb of memory whenever i copy or deal with a big ammount of data, windows swaps out everything from memory to the virtual memory swapfile, to make room to data cache. ...
1
vote
0answers
63 views

Allow windows to use more than 64GB of virtual memory

I am running a process that will take a lot of memory (far more than I have physically), and I want it to finish. Currently, when the committed memory amount reaches 64GB for the system, windows ...
1
vote
0answers
141 views

Linux on iMX6 and CMA memory

We have a embedded linux system(yocto 1.8) running on a i.MX6 board with 1GByte of RAM. The kernel is configured to have 320MByte of CMA reserved and no swap. Kernel 3.10.53 When we run a small test ...
1
vote
0answers
102 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 ...
1
vote
1answer
48 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
vote
0answers
286 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
0answers
123 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, ...
1
vote
0answers
988 views

16GB RAM. Is it OK to turn off virtual memory? [duplicate]

Possible Duplicate: Do I still need to use virtual memory? I have a windows 7 64 bit machine with 16GB. Memory usage will never reach anywhere near that. Therefore I don't see why Windows ...
1
vote
0answers
459 views

improving swapping strategy

I'm finding linux's swapping strategy to be somewhat less than ideal. In general I have a ton of processes running, maybe 40 or more big ones, and only end up using a few regularly. Nonetheless, I ...
1
vote
0answers
261 views

swapping or trashing with vast amounts of unmapped pagecache

I'm using kubuntu jaunty (i386 32bit), kernel 2.6.28-13-generic. I've 4Gb of RAM, of which only 3317Mb are seen by the system (I guess because of the 32bit system). I'm seeing that the pagecache ...
0
votes
5answers
533 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 ...
0
votes
6answers
4k views

How much RAM will Windows 7 consume or reserve for cache if I install 16 GB of RAM? [closed]

I have a pc with 4 gb of ram. I am thinking of buying 16 gb of ram because it might help windows 7 cache more "stuff" and I would browse stuff faster and maybe it would allow games to cache all data ...
0
votes
1answer
108 views

Is that true that Windows can eventually address executable files as if they were parts of virtual memory?

I've once read somewhere that Windows can treat programs' executables and DLL files as parts of swap file rather than duplicating their content into pagefile.sys when swapping them out of physical ...
0
votes
2answers
620 views

sizes of RAM, of virtual memory and of swap for 32-bit OS

If I understand correctly, a 32-bit OS (Ubuntu) can only address 4GiB memory, so RAM with size larger than 4Gib will only be used 4Gib of itself and the rest is a waste. I am now confused about this ...
0
votes
2answers
4k views

Virtual memory usage vs resident set size

When I launch php-script and do ps aux and have huge number for VSZ, about 450MB. Whilst RSS -- Resident set size -- is about 10MB. From wikipedia, Resident set size is is the portion of a process's ...
0
votes
2answers
92 views

When is virtual memory not so virtual anymore?

On Windows, Mac & Linux there's virtual memory underway for every application software process in a RAM stack. But in regards to the actual use of my memory accessing data types, where exactly ...
0
votes
1answer
105 views

Fastest storage for virtual memory

I want to know which is the fastest storage medium like hd, fd, sd card.... to be used as virtual memory as my RAM is only 1GB and I didn`t want to spend too much on purchasing a new one.
0
votes
3answers
6k views

Can Windows 7 pagefile be turned off if 4GB of hi-speed RAM present? [duplicate]

Possible Duplicate: Any reason not to disable the Windows pagefile given enough physical RAM? I believe that there is enough of memory for everything used at the moment to be stored and that ...
0
votes
1answer
58 views

Virtual memory running out when there are free physical memory?

My firefox suddenly become sluggish and then froze. I opened Process Explorer to see what's going on and noticed the main thread of firefox.exe was stuck in the kernal function NtAllocateVirtualMemory....
0
votes
2answers
123 views

The instruction at X referenced memory at Y. The memory could not be written

TFG (Total Files Gaurd) is a software that used in offices to protect client's data from thief by malware and users. It encrypt some types of files(Network's Admin selects which type he/she want to be ...
0
votes
2answers
55 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 ...
0
votes
1answer
61 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 ...
0
votes
1answer
152 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 ...
0
votes
1answer
794 views

System thinks it is swapping, but isn't

I have a linux server (Ubuntu 10.04) which has no swap space (swapon -l reports nothing, 0kb swap memory listed in /proc/meminfo). The beginning of the output of top (sorted by %mem) is reproduced ...
0
votes
1answer
2k views

Can I disable virtual memory? [duplicate]

Possible Duplicate: Do I still need to use virtual memory? Suppose I have a system with 8 gigs of RAM. I have used systems with less than that including physical RAM and virtual memory. So, ...
0
votes
1answer
35 views

How much of logical memory is actually allocated for each process on disk?

Suppose the processor is 32 bit. So each process running on that processor gets 2^32 bits of logical memory. If the system is having n processes, is n*2^32 bits allocated on disk? where is it ...
0
votes
1answer
32 views

big pagefile for a windows system with low RAM

My Windows Server 2012 - 64 bit has nothing more than 4 GB of RAM. Unfortunately I am in need to open and keep in memory files of around 40 GB. To make sure this happens can I just increase the size ...
0
votes
1answer
84 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 ...
0
votes
1answer
248 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 ...
0
votes
1answer
1k 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
1answer
956 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
262 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, ...
0
votes
2answers
591 views

What is the point of loading a program into RAM if virtual memory is just going to put it back on the disk?

After reading this question about virtual memory, I was inspired to ask: it seems like walking in a circle when a program is run it is loaded into memory from disk but then there's not enough space in ...
0
votes
1answer
107 views

Linux virtual memory consumption after parsing log file

I wrote a parser to read the auth.log. For some reason while parsing auth.log I get that VSZ is larger than the total physical memory, which is 2GB. Depending on the size of auth.log and how long ...
0
votes
2answers
931 views

Empty/dump modified memory to pagefile in windows

I use process hacker to clear out a few gigs of ram before loading large files such as 2GB stack traces so that everything does not freeze up for an hour as stuff gets swapped back and forth. However ...
0
votes
1answer
843 views

Is there an alternative memory allocator that uses separate swapfile?

Is there alternative allocator that can be LD_PRELOADed into a process, overrides "malloc", "calloc", etc. and allocates things using it's own swap files (mmaped to files instead of MAP_ANONYMOUS)? I ...
0
votes
1answer
630 views

Virtual Memory and SSDs [duplicate]

Possible Duplicate: Virtual Memory and SSD On a Windows 7 system, isn't it more beneficial to leave the page file ON the SSD versus moving it over to a HDD? I've heard some say if you move it ...
0
votes
1answer
27 views

Why Does my VM Keep Vanishing?

I have a Windows XP SP3 Professional OS running on a Dell Optiplex GX270. When I'm working with Visual Studio Express (a programming IDE), Google SketchUp, or any other resource-heavy program, my ...
0
votes
1answer
125 views

Virtual memory paging

If the page size is 512 bytes and the paging table has 64 elements, each 11 bit. Howmany bits is the physical address then? - What does '11 bit' mean in this case? Is it the number of the frame (2^11) ...
0
votes
1answer
5k views

Need for page file with 12 GB RAM [duplicate]

Possible Duplicate: Windows 7 pagefile size with large RAM and SSD I recently got my new PC with 12 GB RAM (running Windows 7 64bit). The default installation suggests a 12 GB page file on the ...
0
votes
0answers
20 views

Two pagefile.sys files, each on different drives. Can i delete one of them?

I have my main 250GB SSD C drive, saved over where my Windows 8.1 OS resides. On it's root directory i have all the files OS uses, like pagefile.sys, swapfile.sys, BOOTNXT and others. Everything's ...
0
votes
0answers
10 views

how to allow python script program use virtual memory to avoid can not allocate memory error

i find this question, but solution not available, it seems not set overcommit policy, how to use virtual memory for python to use more memory than existing memory for example, if i have 70GB memory, ...
0
votes
0answers
35 views

PC locks up when RAM oversubscribed

As occasionally happens, my computer locked up today. The screen was frozen, the mouse unresponsive, and there was no response when I pressed Ctrl+Alt+Del and Shift+Ctrl+Esc. In this case it was the ...
0
votes
3answers
46 views

Linux server just as RAMdisk

I want to setup an anti-forensic Linux server to protect my users. My aim is to have the Linux distro and everything inside of it running from RAM, never storing anything permanently. It is possible ...
0
votes
0answers
6 views

Virtual memory size same Python application on Centos 7 and RH 5.2

Is there a reason why the same python app and code consumes about 90MB of virtual memory size in Red Hat 5.2 32bits python 2.4 and abut 300MB in Centos 7 64 bits with python 2.7? Both app's versions ...
0
votes
0answers
12 views

Virtual Memory Management in El Capitan (10.11.1)

Recently, I've learned a little about both Windows and Linux approaches to virtual memory management, finding the ability to tune Linux's VMM system for particular purposes particularly interesting. (...
0
votes
1answer
67 views

Kernel threads and process virtual address

If the kernel is spawned as threads and resides in the memory then how could the ps command identify them if those are not normal process and i give you more look here: root 2 0 0 févr....