Random-access memory (RAM) is a form of computer data storage. Today, it takes the form of integrated circuits that allow stored data to be accessed in any order with a worst case performance of constant time.

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Questions regarding RAM wiping using Sdmem on logout

I have a few questions regarding the thread. 1) Would executing sdmem before i log out wipe rests of my encryption key out of the RAM of my laptop so that i can let the camera record and be secured ...
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4answers
55k views

MicroSD card is set to Read-only state. How can I write data on it?

I have a MicroSD card reader in my notebook. When I insert a MicroSD memory card into it, I can't write any data on it - it's read-only. The same thing happens when I try to do it under root. And I ...
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2answers
406 views

How do I run memtest86+?

If I encounter a situation where I suspect my machine's RAM might be going bad, I might need to launch memtest86+ to check it. How can I do this using Ubuntu? Are there different methods for launching ...
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451 views

VMware Player RAM memory problem

I've installed windows 7 on ubuntu using vmware player. I have a 6 GB ram memory, so the amount of memory I've allocated for this virtual machine is 2520 MB. But when I look in the "system monitor" on ...
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5answers
819 views

How to log memory usage per minute on Ubuntu Server?

I checked few programs such as htop or top command but couldn't find any features for logging per minute. Is there a way to do that for tracking memory issues ? edit: I was using linode and decided ...
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2answers
27 views

record of swap/memory usage - how to do it?

Here is a quick intro to the problem, but if you're interested only on the question, I think you may skip to the last paragraph. I have installed Ubuntu Mate on my laptop with the recommended amount ...
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0answers
11 views

Virtualization hardware review

I'm running an home server based on Ubuntu 14.10 for running some services that I need on my LAN such as: mysql db, LAMP stack, NFS share, Squid proxy and so. My machine is built on Intel(R) ...
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0answers
16 views

see how much virtual memory is assigned to a process-bash

I have written a script which assigns virtual or "simulated" memory to a process that I have created. What I want to know is, how can I then list how much memory the process has? I want it to return ...
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0answers
13 views

My laptop very slow, Is the problem with Hard Disk or RAM ( very low Timing cached reads value)

My laptop has been running very slow, I reinstalled Ubuntu and also tried windows but didnt find any difference. I thought this could be a problem with my HD . tried the below tests with hdparm sudo ...
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1answer
15 views

Real & accurate memory usage statistics (top)?

Need accurate memory usage statistics to figure out what size matrix I can work with without choking the RAM on this laptop. ;) I am using top to figure out how much memory an app I'm working on is ...
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1answer
36 views

How do I know how much RAM can I upgrade my laptop?

I have a HP Pavilion laptop quite old (2008) which I would like to increase the RAM. Ideally I would like to have 8Gb but I have no idea how to check if hardware could support this extension. These ...
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0answers
12 views

Desktop computer slowdown on heavy loads

In Linux generally, is it possible to limit cpu, ram and iops(hdd,nic..) given for processes not belonging to core operating system, including system libraries, X server, system utilities, user ...
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2answers
27 views

Gluglug ThinkPad X200 Ubuntu?

I'm looking at buying the Lenovo ThinkPad X200 from Gluglug (http://shop.gluglug.org.uk/product/libreboot-x200/) and they say they have Libreboot so you can install any OS, but I'm wondering if the ...
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0answers
10 views

Virtual address to physical address

Please can some one tell me how to use a virtual address to find the physical address on the RAM. for example I have a 32 bit virtual address 0xabcdefgh. How do I access the physical address this ...
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0answers
26 views

Why my memory is shooting to nearly 100 percent which makes my laptop unable to work?

I am a newbie. I am currently using xubuntu 14.04 on my old dell laptop (~8-9 years old). When ever i watch any video on YouTube or similar site the video is not coming properly. I am not able to do ...
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0answers
10 views

Ubuntu VM shows different RAM then what vCenter is showing

I created a 64-bit VM with 4 GB of RAM and installed Ubuntu 14.04 64-bit The command, free –g, shows a total of 3GB The details screen on the desktop shows 3.9 GB vCenter Server Performance Monitor ...
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0answers
28 views

Wrong amount of memory show in Settings -> Details in Ubuntu 14.04 [duplicate]

I have installed 4Gb as two modules but only 2.9Gb is shown in Settings.
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3answers
5k views

Why is my /dev/loop0 showing full?

I have sufficent memory , but somehow I get my /dev/loop0 showing usage of 9 GB here's my df-h. Filesystem Size Used Avail Use% Mounted on /dev/loop0 12G 10G 1.4G 88% / udev ...
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0answers
17 views

Zcache Usage in Lubuntu

Recently I appended zcache to my grub configuration: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash zcache" But I am at a loss as to whether zcache is working or if I need to do something else. There is ...
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2answers
2k views

Why runs evolution-calendar-factory?

Why runs evolution-calendar-factory? Here are some processes (created with ps aux --forest) lightdm \_ /usr/bin/X -core :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch \_ lightdm ...
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0answers
22 views

Jave heap space error appearing Linux ubuntu 12.04

I'm running my program and this error appears after some time java.lang.OutOfMemoryError: Java heap space at HadoopMyapp.HistogramPair.<init>(HistogramPair.java:25) at ...
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0answers
6 views

osx vmware on dual boot ubuntu and windows 7

I already tried rebooting and suspending multiple times. The problem is when i run vm on windows 7 its much more faster and snappier as compared to ubuntu Actually installation of osx in vm ware gets ...
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2answers
172 views

Why do programs (including Xorg) close when out of RAM but Swap is near empty?

I have some swap configured and I believe activated... Filename Type Size Used Priority /dev/sda5 partition 7811068 1124912 200 ...
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0answers
19 views

java.lang.OutOfMemoryError: Java heap space

I'm using Hadoop in my application, but just before the program exits I get this error java.lang.OutOfMemoryError: Java heap space I already modified the mapred-site.xml and added this property to it ...
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1answer
26 views

How to free up my laptop's RAM?

I have an old DELL laptop with 2GB of RAM and Ubuntu 14.04 (64-bit) as its OS. Many times I am out of RAM and thus every thing goes very slow! I think there is many background programs (services or ...
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2answers
87 views

Gnome System Monitor shows only 5.7 GiB RAM of 8GB installed

Some time ago, I reinstalled Ubuntu, like I did a lot of time before. Since then, Gnome System Monitor and System Information (and any other graphical tool I tried, for that matter) show only 5,7 GiB ...
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1answer
29 views

RAM memory size info confusion; F2 key or “System Setting”?

I am receiving two different figures for my RAM size. I have installed 2x2GB RAM and F2 key says I have 4028MB but Ubuntu System Setting "Detail" aka "About this computer" says I only have 2,9G. I ...
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2answers
2k views

Ubuntu 14.04 (amd64) not detecting all of my memory

I've got 4gb of RAM installed in my machine but Ubuntu only detects 2.8gb of RAM If I run uname -a I get: Linux DeLillo 3.13.0-24-generic #46-Ubuntu SMP Thu Apr 10 19:11:08 UTC 2014 x86_64 x86_64 ...
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1answer
30 views

Can I install 8gb of memory to full Macbook 5,1 Ubuntu install?

Seems that 8gb of memory is not stable in original Macbook 5,1 if I'm not running "Mac OS X 10.6 "Snow Leopard" or higher and have Boot ROM Version MB51.007D.B03" ...
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1answer
24 views

Theoretical question about memory usage

I'm wondering about following issue: Taken some abc console(no matter if bash,zsh or something) in some *nix system. If I start some process stuff which uses 2MB of memory and then launch second ...
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0answers
59 views

X.org is allocating more than 900MB of RAM but xrestop says ~1/40th of that is actually used; how I force it to free the rest without restarting X?

So X.org is allocating an insane amount of RAM: right now 910MB (according to the RES column in htop), second only to Firefox (really Nightly) (at just over 1GB) and trailed by GNOME Shell (at only ...
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1answer
157 views

4GB out of 8GB total reserved 64bit 12.04 why

Can anyone explain why 50% of my ram is being reserved and for what? I do have two radeon 7990 cards but surely the ram is not reserved for them? root@stan-desktop:/home/stan# cat /etc/issue Ubuntu ...
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0answers
25 views

httpd process high memory utilization

My httpd process is utilizing high memory per process. My site is php coded and create on drupal as a content management system. We have a high end server with 8 cores and 16 gb RAM. my per process ...
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0answers
18 views

problem using mmap() using linaro running on zynq SOC with ARM processor

I am trying to execute the following code in linaro on zed board. My problem is that I am trying to access the Physical locations by mapping them to virtual locations and the problem is I am trying to ...
0
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2answers
393 views

How to increase video memory in Wine? (Wine version 1.6.2)

I'm trying to run a program(BeamNG.drive) on Wine 1.6.2, and there seems to be a problem. See, here's the thing: I can actually get it to load most of the way. But just before it would have finished ...
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0answers
45 views

swap memory value / percentage meaning

Swap memory can be set between 0 to 100 What Does It means when we set swap memory to .. ? swappiness= 0 Tells the kernel to avoid swapping processes out of physical memory for as long as ...
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4answers
29k views

How to check video memory size?

Is there a way to check the size of the video memory? Specifically, is there one that works accurately for both integrated GPU's as well as PCI/AGP graphics cards? Many integrated GPU's have ...
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1answer
133 views

Ubuntu 14.04 detects 4 out of 8GB of ram

I've been dual-booting my laptop for about six months now, on one side Ubuntu 14.04 and on the other Windows 7. When I bought this computer two and a half years ago, it had 8GB of ram. My Windows ...
14
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4answers
31k views

How do I clean or disable the memory cache?

After the system starts, in a few minutes my memory cache fills up and it starts using the swap. Here's a screenshot of /proc/meminfo. However, if I can disable this process / clean the cache once ...
49
votes
7answers
86k views

How can I monitor the memory usage?

I have used top to see the memory usage at the moment. But I would like to monitor the memory usage over a period of time. E.g start monitoring and then execute a few commands, and final stop the ...
0
votes
1answer
137 views

Ubuntu 14.04 LTS 64-bit only shows 4GB RAM out of 8GB recognized [closed]

I have two memory cards of 4GB = 8GB RAM installed and Ubuntu 14.04 LTS 64-bit only shows 4GB RAM. How can I make it show the whole 8GB? You can see the details below, I have also included some ...
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votes
1answer
80 views

4GB RAM installed, Ubuntu shows 2.5GB

Lenovo ThinkPad E430, hardware is straight from the vendor, untouched. There are 4GB RAM installed, one card. Yesterday I discovered Ubuntu sees only 2.5GB. BIOS detects 4GB RAM. The system is 64bit ...
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votes
1answer
72 views

ubuntu 14.04 server memory problems

I'm getting this weird memory problem that causes massive slow down on any programs but doesnt want to go away till reboot. so when i do htop the memory usage shows half my ram is used but if i do ...
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votes
2answers
64 views

Can i use Ubuntu 14.04 32bit on 4GB ram? [duplicate]

like the title, if yes it can use all my RAM if needed ? or max just 2GB
10
votes
2answers
48k views

How do I change Java Runtime Parameters?

On Windows, I could change how much RAM Java could use by typing something like -Xincgc -Xmx2048M in the Java Runtime Parameters. How can I do that in Ubuntu?
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1answer
36 views

Xubuntu won't start when using 4Gb Ram

So here is the situation, I was using Ubuntu 14.04 32 bits. Removed everything from the partition I had and created an additional Swap partition and installed Xubuntu 14.04 64 bits. When booting I can ...
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1answer
49 views

WIn7 & Ubuntu fail, replaced RAM, now error no. 5 while installing ubuntu, XP install fails & win 7 BSODs

I had a dual boot system with Windows 7 and Ubuntu, everything was fine, but recently something went wrong, both the os began to hang, then the system was completely dead. I had to change the ram / ...
3
votes
1answer
102 views

How to Setup tempfs/RAM Disk (Generally and for LuaLaTeX)?

I've spent the past several hours (not few, several!) reading different pages and questions on how to setup a tmpfs/RAMDisk. They all say different things and say what filesystems I should and ...
10
votes
2answers
58k views

How much memory (RAM) should I allocate to the Virtual Machine?

I'm installing Ubuntu in a Virtual Box; my host OS is Windows 7, and I have 6GB of RAM on my system. One tutorial on setting up Ubuntu on a virtual machine (this one, on step 14: ...
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0answers
51 views

Linux kernel: page substitution policy

I am supposed to answer for homework which algorithm is implemented in Linux for the virtual memory page substitution and also give some extracts of the code to prove that. After some research I have ...