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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My MacBook Pro gets a kernel panic on shutdown or reboot

My Macbook Pro (Retina, Mid 2012) kernel panic every time when shutdown or reboot. I'm currently using OS X 10.11 El Capitan. How can I solve this issue? Here is the panic report *** Panic Report ***...
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1answer
23 views

Does a page table itself have a virtual address?

If not, how does the kernel build a page table when creating a new process, and modify a page table entry when swapping in/out a page of a process? I think that instructions, running in either user ...
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5answers
195 views

Why doesn't a SSD improve the speed of running applications compared to a HDD?

In articles/forums about pc gaming I always see people saying how Solid State Drives only make games load faster at startup (of the applciation) than they would with a Hard Disk Drive, and that an SSD ...
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46 views

Virtual memory on windows 10

I've read on many articles and i've seen on my previous PC that the default Windows virtual memory formula is : 1.5 X RAM Size (for initial size). But on my new Pc with 6GB of RAM , with windows 10 ...
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2answers
28 views

Verify there's enough memory and storage to compile a file?

I'm testing a C++ library under Solaris 11 with Sun Studio 12.5. The library is trouble free under Sun Studio 12.2 through 12.4, but its having trouble under 12.5. Under 12.5, the pain point appears ...
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16 views

Virtual Machine RAM Allocation

I want to know if I can use a 32 bit Host OS to run Virtual Machines (VM) using the remaining RAM installed on the host environment. I am specifically interested in VirtualBox, Windows 10 32 bit, and ...
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0answers
37 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 ...
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0answers
22 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, ...
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1answer
113 views

What is the Optimal Virtual Memory Size For 8 GB RAM | WIN 10?

I would like to ask experts that What is the optimal Virtual Memory Size For 8 GB RAM | WIN 10 and how you calculate? I know the system says 1906 MB is recommended but is it enough or I should set ...
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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 ...
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1answer
37 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 ...
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31 views

Windows 7: Set Physical Memory Limit [closed]

Where can we set the maximum physical memory an Application/Process can use. I am not trying set a cap on Maximum memory, rather the amount allowed on physical memory before switching to virtual ...
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3answers
50 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 ...
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1answer
48 views

How to detect thrashing on an SSD-equipped system?

With spinning hard disks it was relatively common to hear disk thrashing when some process, Windows or otherwise, was making a bad fist of things. Quite often this was an indicator that a process was ...
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0answers
8 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 ...
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2answers
25 views

What is the primary reason more RAM makes a computer faster?

Whilst studying for an exam I read that more RAM decreases the number of page faults. Given that handling a page fault can cost many millions of CPU cycles is this the primary reason more RAM will ...
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0answers
17 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. (...
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0answers
70 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 ...
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1answer
73 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....
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2answers
53 views

Is data from a usb device stored in ram while getting same ( etc explorer listing items )?

Does it go first in ram then to software? Or does some programs like Windows explorer have "VIP" permission cause they are child of OS, for direct access? EDIT Does it possible to make kernel, to ...
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0answers
33 views

Getting “Watch Dog Time out” when starting VMWare Workstation

I had installed VMWare Workstation at my windows 8.1 but whenever I am starting the VMWare Workstation I am getting error "Watch Dog Timeout" could please suggest us what to do now. I have 4 GB of RAM,...
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1answer
64 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....
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33 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 ...
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0answers
17 views

Does virtualization reduce disk trashing?

If a program does a lot of disk trashing (like Chrome), can this be reduced by running it inside a virtual machine? How does a VM host handle disk writes that requested by the virtualized OS?
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33 views

how does a process know it's pages have been swapped out?

Let's assume I have several processes running, a1 and a2. a2 takes so much space that physical pages belonging to a1 start to get swapped out. a1's page table has to be modified to reflect this. how a ...
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1answer
57 views

Is it possible to manually send programs to virtual memory in windows?

If you have many open programs and your machine is going too high on memory/cpu utilization you might want to close a program without loosing its state (sending it to virtual memory) and then resume ...
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1answer
54 views

What does the content of the page table look like after a page has been swapped out to the disk?

From what I understand, the page table maps virtual addresses to physical addresses. But what if a page has been swapped out to the disk? Wouldn't the location of the data take more bits to write ...
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2answers
159 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 ...
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0answers
171 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 ...
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1answer
328 views

Change virtual memory size in Windows 10

How do you change the page file size on Windows 10? Note: The last Windows operation system I've used is Windows 7.
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1answer
41 views

Processors and virtual/physical addresses

In nutshell, as I understand memory management, processor produces virtual addresses. These addresses are translated to corresponding physical addresses using per-process address table by MMU (with ...
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1answer
74 views

What is Windows virtual memory allocation policy?

I set the size of the virtual memory to be managed by system. While there is ample space on the disk, I ran into the 'out of memory' error, contrary to my assumption that the system should just ...
2
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1answer
714 views

How to diagnose low memory on Windows 10?

2 weeks ago I upgraded Windows 8.1 to Windows 10 on my system; Core i5, 4GB RAM. It was working fine, Now I am getting “Windows on low memory." messages. System process is taking too much memory. If ...
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2answers
44 views

Disable win7 harddisk ram for a specific software

Sometimes when you ask matlab to create a very large array, it exceed actual ram and tries to go into harddisk, which slows down the computer so much that it becomes impossible to close matlab, only ...
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1answer
4k views

Operating VirtualBox 5 on old Pentium 4 32bit CPU with 4GB RAM

Trying to operate VirtualBox 5 on old Pentium 4 32bit CPU with 4GB RAM. But spinning up 32bit Linux/Ubuntu VMs is so slow. Have adjusted allocation of RAM and hard drive settings and still too slow. ...
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0answers
30 views

What's the internal operations for a PC to copy data from an external flash drive to an internal HD?

I was asked about the operations on how data is copied from an external storage to an internal storage in a computer. The info I could find is about how a CPU fetches data from RAM. I don't have ...
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2answers
611 views

Why does my CPU only support 32GB RAM when it has 39 address bits?

The following is the output of cat /proc/cpuinfo user@localhost:~$ cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 60 model name : Intel(R) Core(TM) i3-...
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1answer
86 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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2answers
57 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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2k 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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1answer
251 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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0answers
111 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
426 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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1answer
165 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 ...
2
votes
1answer
710 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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0answers
168 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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3answers
71 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
221 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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1answer
483 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 ...