RAM (random access memory), either RAM hardware or software and operating system use of RAM.

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Attempting to access RAM /dev/mem… says “Operation not permitted”

I am using Ubuntu 12.04 I read the following tutorial on how to access the contents of RAM in Linux.... http://www.rootninja.com/using-dd-to-search-for-strings-in-memory-or-devices/ Code: dd ...
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Down-clock 1600Mhz RAM on Macbook Pro Mid 2009

My Mac (Mid 2009- MacBookPro5,5) installing OS 10.8.2. Currently, it is using 2 x 1GB (1066 Mhz). My friend gave me 2 x 2GB (1600 Mhz) of his 2012 Mac. After installing 2 x 2GB (1600 Mhz) on my ...
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64 views

Seemingly inconsistent output from `top` re: Swap header vs. SWAP column

How should I interpret this seemingly inconsistent output from top re: swap? Running free confirms that no swap space is in use: $ free -m total used free shared ...
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672 views

Is it possible to use GPU memory as more main memory?

I have a ATI Graphics Card with 1G of RAM. GPU-Z says that 143MB (dedicated) and 75MB (dynamic) is being used on the card (GPU). Is it possible to get your PC to use GPU as more RAM (main memory) for ...
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16 views

Pagefile usage fluctuating with zero paging I/O

I fired up the Performance Monitor and noticed that the % Usage on the 4GB pagefile fluctuates between 4-10% while the computer is sitting "idle." (I calculate that to be approx. ~160-400MB.) Memory ...
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34 views

Memory tests fail with 2 memory modules but work with either module individually. HP laptop with AMD Radeon HD 6520G

I'm getting recent memory test failures in an HP Pavilion g7-1303sa laptop (one month out of warranty :( ). The memory is the factory installed 6GB installed as a 2GG module in the top slot and 4GB in ...
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282 views

Not enough memory error with Microsoft Word

Friend's computer (Dell, running Windows 8 64-bit) has been getting a weird error recently; whenever he tries to open a Microsoft Word file from Windows Explorer his computer tells him that there is ...
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112 views

Process tree CPU history usage, process tree memory usage (aggregated) on Windows 8.1

This question is general for Windows OS, but I would like to see a software for Windows 8.1, since this is what I use. I'm looking for software, that will take a process tree (e.g. Chrome.exe ...
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206 views

How to force the Linux kernel reclaiming cache memory rather than using swap?

I have a PostgreSQL-driven web service on two Debian servers, one a vhost running Linux kernel 3.2.0-2 with 2GB RAM and the other a dedicated server running Linux kernel 2.6.26-1 with 6 GB RAM. ...
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54 views

MemTest86+ bad adresses constant despite swapping sticks, processor/MOBO to blame?

(Sorry for the wall of text, but people seem equally critical of missing details) After about 2 years without trouble, I've been having issues recently with system instability, BSODs, random ...
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263 views

Computer suddenly won't detect half the RAM

I have a System76 wilp9 machine running Ubuntu 14.04 which came with 32GB of RAM installed. When I rebooted it today, it displayed a warning that the memory decreased, and now both the bios and linux ...
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3k views

Perf samples too long, lowering kernel.perf_event_max_sample rate to

My machine freezes from time to time and I can get it working back by pressing the space key. I have this problem since two weeks now, but it was just once per day max. Now it's starting to be many ...
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79 views

Utilizing the full power of my workstation

I am not a gamer. Used to be, 10+ years ago. My workstation is strictly for business: Quickbooks Excel Access General Business QuickBooks is tied to a synchronization engine that is synchronizing, ...
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120 views

What desktop computer hardware specifications are most important for database heavy applications?

I am purchasing a new personal desktop computer with the hope of improving performance for database-heavy applications (mostly data mining). I will want versatile hardware for all sorts of future ...
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346 views

Sony Vaio VPCEE2E1E memory upgrade issue

I own Sony Vaio laptop VPCEE2E1E and I recently upgraded RAM MEMORY from default 3GB to 4GB after that operation I'm facing serious problem with performance.Windows shows that I have only 1.74GB ...
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Random BSOD crashes when all RAM slots are occupied

Although I'm a long term user of other StackExchange sites this is my first question on SuperUser, so please let me know if I've neglected any community customs I am experiencing regular BSOD crashes ...
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252 views

Apache memory usage never goes above 5%

I'm deploying an application that uses ImageMagick into VPS server. I tested in on two different OS: Centos6 and Ubuntu Server 12.04. On Centos6, the application is working properly and when ...
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571 views

What's so special about `hal.dll+12a3b`?

I have a BSOD/STOP 0x124 problem that keeps haunting me for a very very long time: It always happens at address hal.dll+12a3b. In my searches for an explanation/solution, I found suggestions that ...
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380 views

Mac suddenly says I'm out of space, and terminal says low on swap space

I'm running a pretty dated Mac but its what I have and can't afford throwing hardware at the issue. I am on Mac 10.6.8 Suddenly Terminal says Terminal has detected the system is running low on ...
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362 views

Random freezing caused by khugepaged?

I have a fairly beefy Arch Linux computer, kernel 3.7.7-1-ARCH. However, recently it's been having random freeze ups. Never common, but it'd freeze for a good 15 seconds where no program is ...
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55 views

Using the heap command line tool

I am getting a crash while using libgmalloc and I get a complain which says something like Failed to VM allocate XYZ bytes Explicitly trapping into debugger!!! Now I when I encounter this ...
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413 views

Seagate external hard disk does not power down

When my computer is off, this external hard disk remains on, consuming power. It is permanently warm, and inside components are active (perhaps the fan?). I have a UPS for the system so a complete ...
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302 views

Overheating RAM, ddr2 motherboard 2 slots

Recently, I bought a new memory stick to speed up my machine, which is the exact product that I have been using. The problem is either of the RAM overheats like after 5 minutes once my computer turns ...
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174 views

Unusual memory usage spike

Ok, on Windows 7 64 bit, I basically use Firefox to browse the web, with a DSL broadband connection.Sometimes while surfing, I see the computer slows to a crawl for a few minutes and then goes all ...
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77 views

How big is PATA throughput on original Macbook Air (Rev A)?

I still have one of the original Macbook Air's that I use sometimes. It's got 2Gb of RAM and whenever it's filling up and starts paging, the whole things becomes barely responsive. I've heard SSD's ...
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201 views

System Memory: Only half is being displayed

Using multiple tools, I have verified that my computer can "see" that 8GB of RAM is installed, but only is using 4GB of ram. I've seen this behavior with: Memtest86+ 4.20: Memory SDP Information ...
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472 views

How many RAM Hardfaults is too many?

Trying to play BF3, sometimes seemingly randomly, it will start lagging. I assumed despite 4GB of RAM, it might be hitting its max. I just however noticed a lot of RAM Hardfaults. Is this a lot, or ...
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210 views

Asus P4B SDRAM Upgrade

I have to fix a PC for a friend - and - bought RAM because 256 MB SDRAM PC133 is not enough for WinXP. I bought 2x 512 MB SDRAM PC133. If I insert one stick, it doesn't matter which one, the PC won't ...
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29 views

Memory to CPU bandwidth limitations

(sorry for weak english I am not native english) We have now parallelised SIMD arithmetic (like 8 float mulls or divisions in one step) theoretical (but also nearly practical) arithmetical bandwidth ...
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18 views

Are there any memory tests that will identify the slot where an error occured?

I'm experiencing symptoms that in the past have always led to a RAM issue, but in the past have had to go through the incredibly tedious process of working through a variety of lengthy RAM tests that ...
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31 views

Can't boot from any source

I recently tried to install the Windows 10 developer preview on my laptop. The installer seemed to hang immediately after I selected my install partition, but I left it for about an hour to make sure ...
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42 views

Interpreting memtest results - 0 MHz?

I have tried to install Ubuntu on a laptop width damaged Windows, and it gave me an error. After some checks, the only that give some strange results is memtest86+. I don't know how to interpret ...
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78 views

Macbook Pro very slow despite normal memory and CPU usage

My MBP (OS X Mavericks) with 4G RAM has been slow ever since I bought it last year, but now it's getting ridiculous with the loading symbol showing up each time I open a new tab in Chrome or even ...
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29 views

Is there a way to 'clean out' physical memory (RAM) that is tied up on my Centos/Apache webserver?

I am developing something that requires Server-side javascript, and as such am using PhatomJS to run the JS. It uses up about a 1GB of physical memory when all is well, but if I screw up some ...
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49 views

Is MemTest86+ Testing All My Memory?

I have a Lenovo D20 workstation that's crashing on boot. 64GB of memory are installed, but /proc/meminfo reports only 2.94GB available, so I'm running memtest86+ to check for memory errors. The system ...
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27 views

GIMP fails to load large image

I have an approximately 7 gigabyte .ppm image, which I wish to open with GIMP. My computer (Windows 8) has 16GB of RAM, so I figured that GIMP should be able to open it fairly easily, as I have set ...
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72 views

PHP exec() causing memory usage to stay high?

I am quite new to using exec() command in php. I am using it along with this script called phantomJS (http://phantomjs.org/) to run a process which creates a pdf of my website's pages. The problem ...
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38 views

Delayed Boot Time & Memory/RAM Issues

I have an older Gateway GT5662, I'm having two specific issues that I think are related. I'll explain each separately and hopefully someone has come across this before. Break down of booting issue ...
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207 views

IIS 8.5 PHP 5.6.2 x64 Fatal error: Allowed memory size of… if imagick is enabled

I changed from PHP 5.6.2 x86 (nts) to x64 (nts) on IIS 8.5 and I got almost every extension to work except imagick. I tried to update imagick binaries to the latest x64 dll version ...
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13 views

Can vSwap and Burst RAM coexist on an openz container

I notice some VPS hosts offer vSwap or Burst. I was wondering if possible that a container could and would use both vSwap and Burst. How would this work in allocating which RAM space is used?
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94 views

Memory not compatible with motherboard?

I've been getting BSODS on my computer and have tried everything that I can think of to find out what's causing... My motherboards memory compatibility list is: ...
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37 views

Java without Java (not just a koan)

I noticed my Ubuntu server was bumping against its RAM limit and using its swap despite not doing a whole heck of a lot, so I checked top and the first thing I noticed was that Java, run by root, was ...
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67 views

How to diagnose dual channel memory / motherboard?

I have ASUS P7P55-M with 12GiB of memory, but it sees only half of it: dims@sagittarius-a:~$ cat /proc/meminfo | grep MemTotal MemTotal: 6102272 kB Simultaneously, it is visible from OS ...
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102 views

My PC blacks out randomly. Screen says “No Signal”, fans and LEDs are running

My PC blacks out randomly. After running for maybe 1hr or so the monitor blacks out and displays "No Signal". Audio also stops and I am unable to turn off the PC with keyboard shortcuts. The green LED ...
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154 views

BSOD that started today: MEMORY_MANAGEMENT, 0x0000001A and 0x0000001E

first of all, this is my system: MOBO Gigabyte G1 Sniper M3. Intel i5 2310. Gigabyte GTX 650 Ti Boost. 4 GB of RAM 1333, Kingston. PSU Corsair TX550M. Windows 7 Ultimate 64 bits. Ok, to the issue. ...
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IOMMU cache coherency

In today's x86/x64 motherboards there can be found IOMMU's from Intel and AMD. They allow peripheral devices to perform DMA (direct memory access) operations into system RAM using virtual instead of ...
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Computer froze with black screen when viewing (not editing) video card's memory in Cheat Engine

I was looking at my computer's physical memory in Cheat Engine (a memory editor/debugger application) and I decided to look at the addresses that Device Manager says are used by my video card. When I ...
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Is there a way to “undercommit” memory in Linux (VPS burst memory woes)?

I've been noticing occasional drastic performance hiccups in my application hosted on a VPS. My VPS plan has 1GB guaranteed RAM and 1GB "burst" RAM. Occasionally the app will become extremely ...
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111 views

How to keep Linux kernel responsive while having high memory usage?

Sometimes I have a lot of programs running and despite of 16GB 8GB of memory my ubuntu linux 14.04 LTS turns out to be not responsive at all. I won't be able to get a TTY to kill some processes to ...
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Increase maximum locked memory for unprivileged user

I am trying to configure Ardour3 for Ubuntu Trusty 64. I get the following error: I have tried: root ulimit editing limits.conf This is my /etc/security/limits.conf: # ...