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Questions tagged [memory-management]

Memory management is the act of managing computer memory at the system level. Questions tagged with Memory Management can cover Applications and Operating Systems

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sqlservr.exe using 24GB of RAM for an inaccessible database [migrated]

A server running SBS 2011 is causing me all kinds of headaches. All but 500MB of the 24GB of RAM is in use, mainly for sqlservr.exe. My first idea was to fix the amount of memory SQL could use. But ...
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1answer
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Very slow server performance at low loads

I use a server at work to run models on modestly large datasets in RAM (think 10GB to 100GB). There are only a few people on this server at any time. The server has lots of RAM (over 1TB) and many ...
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1answer
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How to delete a unaccessible volume on Mac?

Hi do I delete virtual partition on virtualbox? I'm using MacOS Mojave v10.14.3 and once installed virtualbox. I deleted the virtual machine and the app. However, the partition is still there. How ...
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How guarantee a responsive Desktop using cgroup memory limit

I would like to setup a system with limited memory (raspberry pi) in such a way that application can't cause the desktop (x11, LXDE, openbox, mouse driver, video card driver) to be unresponsive. When ...
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Why is VirtualBox Guest Memory allocated in system PTE on Windows?

I recently went on a wild chase to find the memory used by VirtualBox. As you may know, in the task manager, or Process Explorer, the memory used by VirtualBox is only a few hundred Megabytes, not ...
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Memory dump on Ubuntu 18.04 failed on too big /proc/kcore/

There are two great articles about how to aquire memory on Linux using linpmem: SANS holdmybeersecurity Trying the approach from holdmybeersecurity I ran into the following issue, which seems to be ...
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164 views

Understanding OOM killer reason on openwrt system

This is a busybox/openwrt system. OOM-killer are intermittently killing processes. Sometimes collectd, sometimes snmpd and as in example below uhttpd. I could aproximately free up 37% by not ...
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Out of memory error in Matlab

I'm using Matlab (version R2013b on MacOS 10.13.6), and running into a strange memory error. In particular, I've entered the following sequence of commands >> A = rand(2); >> [q,~] = qr(...
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3answers
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How to fix MEMORY_MANAGEMENT and ATTEMPTED_WRITE_TO_READONLY_MEMORY BSOD on Windows 10

So after 3 years of using a fresh install of Windows 7 x64, I've to upgrade to Windows 10 because of job reasons. I downloaded the latest Windows 10 Pro build image (1803) from Microsoft and used ...
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2answers
252 views

Can one use 4-bit, 8-bit, 16-bit, or 32-bit sized pointers on a 64-bit machine?

I just did a rough calculation around the max size of an unsigned 64-bit integer, which is: 18,446,744,073,709,551,615 q5 q4 t b m t h Looking at AWS's hardware specifications on their ...
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Understanding Windows Process Memory Layout [closed]

I find many blogs and documents explaining process memory layout. All of them describe a memory layout of following kind: But when I look at the VMMap tool in windows, I find pages of stack, heap etc....
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Virtual and Physical address mapping in 32 bit Windows

Correct me I am wrong. Q1) My understanding is that in 32 bit mode we get 4GB virtual address space. Is this because 32 bit Windows can only support 4 GB physical RAM.? Q2) Every process get its own ...
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Memory exhaustion with apparently no process exhausting it

I am suffering memory exhaustions on a Windows 10 computer nearly every three days, with no pattern to reproduce (sometimes after PC is powered on for days, sometimes just after power on, sometimes ...
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3answers
170 views

Memory management in 32-bit Windows

In a 32-bit system is the 4GB virtual address space for the whole OS or is it for individual process? If it is for the whole OS, then does the OS fools every process that it has its own 4GB of ...
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Virtualbox consuming all of my memory

System specs are as follows: 62.8GB of RAM 1TB of Hard drive space - Samsung 960 Pro M.2 CPU is an AMD Threadripper 1950x - 16Core Running Ubuntu 17.10 Virtualbox 5.1.34_Ubuntur121010 So I started ...
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What to do about the vmmap process in Mac OS X always hogging the CPU?

Hi I am running Mac OS X 10.13.5 High Sierra, and I have always had my Activity Monitor up. My computer would every now and then freeze for a few seconds completely and then act normal again. When ...
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4answers
781 views

Why turning off Virtual Memory doesn't improve my computer's performance?

I'm studying computer architecture, more specifically, virtual memory. One thing that I can't seem to uderstand is why turning off Virtual Memory doesn't improve my computer's performance? I know ...
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Does VMware Workstation use special large pages/huge pages by default?

According to some pretty old source, ESX is using special large pages by default, but ESX is some kind of OS in itself and therefore has full control of memory management. That is different for VMware ...
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1answer
87 views

Windows 8 High System Memory Usage

My problem seems simple. My computer is using more physical memory than is actually accounted for in the sum of my programs. !(Running windows 8.1, latest patches) I use 7.5 GB. Total usage is 12GB....
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1answer
37 views

I/O and Memory in Windows System Information

How to interpreter I/O and Memory in windows System information Msinfo32? Do I/O addresses represent memory location that mapped I/O device register and how about addresses in memory? If there are ...
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1answer
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Is garbage collection in programming language used for collecting heap memory nothing else? [closed]

The garbage collection to recycle object that is no longer used is to deallocate heap memory? Does Memory leak represent no enough heap memory space for the program to run? So what we normally say "...
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2answers
1k views

rammap issues - does not show up anything (win10 pro build 17120)

I'm having some issues with the windows rammap tool. It used to work fine but by going to recent builds 17115/17120 it stopped working - when i start it up it does not show up anything. Refreshing it ...
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Libvirt memory management host and guest

I have set up two guest oses a ubuntu box dedicated to be a vm host. It has two physical cpus (with 6 cores each), 16 GB RAM, and 3 harddisks. Host os is on a 60GB SSD, while the guest oses are on ...
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376 views

Why is `ulimit` not limiting the memory usage as I expect?

I am trying to limit the memory usage of a process $ulimit -m 2 $/usr/bin/time -l ./myProcess arg1 arg2 The process run without being killed until time outputs 7.00 real 4.83 user ...
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569 views

Installed memory: 8.00 GB (6.00 GB usable) - 2.00 GB is Hardware Reserved

I have a 64-bit windows 10 desktop with 4GB (2x2GB) of memory that I built about nine years ago. A week ago I purchased more memory (2x2GB) of the same brand/model/specs to bring the total up to 8GB ...
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Memory Management stop BSOD

Just now my PC (which runs windows 10 ) experienced a memory management error where it ran (headfirst) into a BSOD. and restarted after the 'we will restart when we are done collecting info' screen. ...
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741 views

“MEMORY MANAGEMENT” error when running/installing Windows 10, boots into Linux fine

I have a Dell Inspiron 5559 laptop that I've had for a few years, dual-boot between Windows 10 and Linux Mint with no issues. I had to remove the hard drive for a test repair on someone else's ...
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262 views

PCIe - Accessing Peer Endpoint's Memory Space

I have two PCIe endpoints connected to two root ports on the same host machine and I am trying to access the memory space allocated for the other endpoint from the first endpoint by sending a 32-bit ...
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0answers
71 views

Is it possible for a program to detect that another is directly reading its memory (using for example ReadProcessMemory)?

I was stumbling through public Github repositories when I came across a program (A) that displays information on screen based on whatever it reads in the memory of another program (B), an online PC ...
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1answer
490 views

Windows 10 unable to re-allocate Unallocated space

I have 23 Gigs of unallocated space on my SSD card. I would like to extend my default drive so that I can have unused space back (failed linux install attempt). The problem is the Extend drive field ...
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1k views

Hard Faults + System process memory usage extremely LOW(!)

I have a brand new Windows 10 machine (Dell Precision 7720) with 32GB RAM. It has not been performing well, and I've noticed some things in the Resource Monitor that seems very strange to me. First ...
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I get Bsod with either Memory Management or Faulty Hardware Corrupted Page error and changes on files are deleted on reboot

I get Blue Screen of Death on Windows 10, most of the times Memory Management related, but also Faulty Hardware Corrupted Page. I also noticed that when I write/delete a file and then restart the ...
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1answer
141 views

Slow Operating System

I am using Linux Mint. My system info is like below. When I tried to open more tabs in Google Chrome browser, I found my Operating System become slow. How can I get rid of the situation? Memory ...
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2answers
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Running a Process That Needs 5GB RAM

I run a python process that needs roughly 5GB of RAM which takes about 5 minutes every day on my laptop. However, now, I would like to automate the process and run it on a server (to be more ...
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2answers
3k views

How do I limit RAM consumption of a particular executable?

Microsoft Edge eats up RAM like crazy and I want to scale it back a bit. I don't care if it makes browsing on it laggyer, I just want to have my RAM distributed evenly to my open programs. The ...
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1answer
395 views

What is the difference between “Total physical memory reserved by individual processes” (Task Manager) and “Used Physical Memory” (Resource Monitor)?

What is the difference between "Total physical memory reserved by individual processes" (Task Manager) and "Used Physical Memory" (Resource Monitor)? "Total physical memory reserved by individual ...
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Memory and CPU usage during a denial of service attack. How to understand statistics?

The crontab file has the line: */2 * * * * echo -e "`date`\n\n`free` \n\n`vmstat`\n" >> /home/hacker/free_vmstat_output.txt I extracted the following data: -e ...
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1answer
321 views

Windows is keeping large files I opened once in physical memory, in standby. How can I stop this?

I'm using Windows 8.1 64-bit, have 16gb of physical memory, and I understand why Windows wants to do this, but my specific case is really odd and annoying. For some reason, on occasion, when I open a ...
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1answer
97 views

What is the cause of my BSOD?

Since yesterday, I got different BSOD on my Windows 7 PC. I can't figure out the exact cause of it. You can see all the BSOD codes that I got below. A few days ago, I tried to update my BIOS, but ...
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1answer
2k views

Committed Bytes and Commit Limit - Memory Statistics

I'm trying to understand the actual difference between committed bytes and commit limit. From the definitions below, Commit Limit is the amount of virtual memory that can be committed without having ...
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355 views

Memory management error. Computer fails to power on

Just now my PC (which runs windows 10 ) experienced a memory management error where it ran (headfirst) into a BSOD. and restarted after the 'we will restart when we are done collecting info' screen. ...
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1answer
52 views

In Windows 7, can the amount of RAM available for all tasks be temporarily limitted?

My less-powerful computer has 6GB of RAM. I am writing software that performs a RAM-intensive task on some large data sets. I would like to establish that it will run on a computer with 3GB of RAM, ...
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1answer
62 views

First OS preventing overwriting of memory arreas allocated to different processes?

recently I was asked this rather specific question: Which was the first OS that prevented a process from overwriting the memory area allocated to a different process? I wasn't able to find an answer ...
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1answer
50 views

Moving things to ram [closed]

My laptop has not been feeling well recently. When I checked​ the reasons, I found out Firefox had been performing read and write operations on the HDD at the limit of it's capabilities. After some ...
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341 views

Used nomodeset while installing Ubuntu now not able to go back to Windows

After a lot of struggle I managed to install Ubuntu by adding nomodeset in grub but now I have realised Ubuntu isn't really my cup of tea. Now that I am planning to go back to Windows 10 whenever I ...
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Measuring memory use in Windows 7

I am trying to use WMMap v3.21 (part of Sysinternals) to measure memory use by a (Mathematica) process on Windows 7. Two questions here: WMMap Help says this, in particular: Viewing Changes ...
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1answer
4k views

How does memory/commit charge work in Windows 10?

This question is prompted by the following regularly observed phenomena I'd like to find an explanation for: Current commit is regularly higher than Physical usage + Pagefile size. What's up with ...
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2answers
818 views

If a process is suspended (swapped to secondary memory), then does the process control block also get swapped to secondary memory?

If a process is suspended (swapped to secondary memory), then does the process control block also get swapped to secondary memory? Or would the process control block remain in main memory, whilst the ...
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1answer
115 views

Where did the “compressed memory” go?

In some older versions of Windows 10 there's a "System and Compressed Memory" process indicating that compressed pages are counted there, after many people complained that their System process ...
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1answer
1k views

Very high ram usage, unusually high non-paged pool use by tag Etwr

I have been running out of RAM as of late and have narrowed down that something is leaking in the non-paged pool. My non-paged pool is almost 4GB. In addition to that, the working set of my paged pool ...