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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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 ...
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2answers
1k 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 ...
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340 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 ...
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793 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 ...
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586 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 ...
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26 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 ...
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53 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
6 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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1answer
22 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 ...
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47 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 ...
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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 ...
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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 ...
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0answers
18 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 ...
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26 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? ...
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1answer
40 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?
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1answer
103 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). ...
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1answer
65 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, ...
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0answers
22 views

Copy a page from page cache to kernel space

Is the page cache part of the kernel space or user space? If I need to copy a page from page cache into the kernel space, what is the correct way to do it?
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1answer
456 views

Virtual memory (caching) on Windows 8

I have read a bit about the issue, and I understood that the OS constantly pushes memory to the disk, so later, when another application needs a lot of RAM, it allocates that memory to it and "moves" ...
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0answers
4k views

Create a Virtual USB disk drive and connect it to Virtual Box

I have created a virtual USB removable disk using imdisk http://www.ltr-data.se/opencode.html/ using commands http://diddy.boot-land.net/firadisk/files/imdisk.htm but How I can mount it to Virtual ...
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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 ...
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2answers
544 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 ...
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1answer
99 views

TLB access in SMT processors

In SMT (simultaneous multithreading) processors which threads share the TLB, how does TLB differentiate one thread's access from the other one? Each thread has its own set of pages loaded into memory, ...
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1answer
94 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) ...
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1answer
196 views

Mouse disconnecting and programs not closing and more

My mouse keeps disconnecting and reconnecting as well as my usb modem. My programs don't always close when i tell them to and even when I use task manager. T hey are also using all my RAM for a lot ...
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5answers
130 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 ...
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1answer
116 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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1answer
64 views

Allocation of memory to guest os [closed]

I have 6gb memory on my host OS (Windows 7 64bit), I am planning to install Oracle Linux as guest using Virtual Box. How much memory should I allocate to guest OS? In guest OS I am planning to ...
-1
votes
2answers
345 views

Why does the Windows Task Manager never show more than 80% memory used?

In the Windows Task Manager I have never seen the memory usage close to 100%. If physical memory is never depleted, how come computers have virtual memory? I realize many years ago maybe computers did ...
-1
votes
0answers
17 views

Linux healthy number of major page faults

I have a Solr process which has mapped 100 GB into virtual memory. When I run a load test on the query side, I read from /proc/<pid>/stat that the process has between 200 and 500 page faults per ...
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votes
1answer
186 views

What is Virtual Memory? [closed]

I would like to know what you guys think Virtual Memory is . Also Could you explain to me how the development of Virtual Memory has impacted operating systems and the personal computer.