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.

learn more… | top users | synonyms (1)

6
votes
1answer
2k views

Only 3.2 Gb of memory being used on a 64-bit system

I have ubuntu 11.10 64 bit: Linux 3.0.0-12-generic #20-Ubuntu SMP Fri Oct 7 14:56:25 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux I have installed 4 Gb of RAM: $ sudo dmidecode --type 17 | grep -E ...
6
votes
1answer
2k views

How large of a swap partition is needed to hibernate?

I've read this question, but it doesn't definitively answer my question. If I want my computer to be able to hibernate, do I need to have a swap partition as large as my RAM, or will Ubuntu wisely be ...
6
votes
1answer
8k views

fork: Cannot allocate memory

I am frequently getting: fork: Cannot allocate memory when running commands over ssh. I have 4 GB of RAM and usually 2 GB free. This started happening since I upgraded to Ubuntu 11.10. I then need ...
5
votes
2answers
16k 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 ...
5
votes
4answers
14k views

How to impove Ubuntu performance on netbook

Most recent Ubuntu 12.04 seems to be quite nice and Unity (3D/2D) works fine for me, however not on my old Acer Aspire One any more. There was a times, when I switched from Windows XP to Ubuntu and ...
5
votes
4answers
15k views

Why is the cache in my memory always full?

I have 6GB RAM, i5 2.4GHZ Processor running Ubuntu 11.10. I partitioned my HD so that I have 8GB swap. When streaming online or opening several tabs in Chromium I soon have 4GB Memory in the cache. ...
5
votes
2answers
2k views

11.10 x86 - memory RAM problem (shows 3.4 GB when 8 GB are installed)

I recently installed Ubuntu 11.10 x86 on a new computer that has 2 x 4 GB RAM installed (8 GB total). But when I go to the Ubuntu system monitor it only shows 3.4 GB of memory (and ...
5
votes
3answers
12k views

Why am I frequently getting this “Cannot allocate memory” error?

I'm using Ubuntu 12.10 with Gnome-Classic. I am getting this error frequently and with almost all programs, big and small. When I try to open them, they don't start, and instead I get an error message ...
5
votes
3answers
1k views

How do I know which RAM I'm using?

I want to buy some extra RAM but Hardinfo wont tell me which brand, model, latency and speed I'm currently using to buy the same kind. What else can I use?
5
votes
2answers
4k views

Automatically kill a process if it exceeds a given amount of RAM

I work on large-scale datasets. When testing new software, a script will sometimes sneak up on me, quickly grab all available RAM, and render my desktop unusable. I'd like a way to set a RAM limit ...
5
votes
2answers
608 views

How can I measure how much RAM has been used by a command

I'm trying to measure the memory of a process that I call via the command line (i.e., I want to find out much RAM it takes to for the process ). Is there any command that I can add to the command ...
5
votes
2answers
1k views

How to wipe RAM on shutdown (prevent Cold Boot Attacks)?

My system is encrypted using Full Disk Encryption, i.e. everything except /boot is encrypted using dmcrypt/luks. I am concerned about Cold Boot Attacks. Prior work: ...
5
votes
2answers
1k views

Exclude bad ram bytes

I have 5 bytes (or bits, don't know) of bad Ram. How can I exclude these bytes so my Ubuntu 11.10 don't use them. My PC randomly freez, and when I ran memtest it reported 5 errors.
5
votes
2answers
160 views

Is hypermemory available?

I have a Radeon HD 4550 which supports up to 512 MB of shared memory. When I open the catalyst panel, in the information tab I see that my video memory is only 128 MB which is the base memory or the ...
5
votes
2answers
448 views

Slow Resume After suspend having chrome running with many tabs

I usually use chrome and Firefox for browsing. I also open many tabs (around 40 in both some times). The problem I have occurs when I resume the PC after having suspended it: It takes from 2 to 5 ...
5
votes
2answers
860 views

OS only reports 4.1GB of RAM and not the 6GB that is installed… why?

My ubuntu 64-bit 11.10 installed box has 6GB RAM but Ubuntu only uses 4.1GB. I have read various things about the 4GB limit etc, but all those talk about using less than 4GB. What could be causing ...
5
votes
2answers
914 views

How can I make an existing persistant live USB installation load more of the OS to RAM?

A while back I installed (a permanent installation, not a Live USB) Ubuntu on my USB thumb drive. Unfortunately, the transfer rates are too slow for a smooth and responsive experience, so I'd like to ...
5
votes
2answers
1k views

How to make ubuntu use more RAM?

After 2 weeks of trying, failing, trying again, still failing, I finally got Ubuntu stable and operational. My hard disk is quite old and slow but I have excessive RAM (16 GB 2133 mhz), so I was ...
4
votes
2answers
7k views

Ubuntu Memory Test

Several months ago I was having issues with a Windows PC. I booted from and Ubuntu CD, performed a memory test, and found that I had some bad RAM. I'm having some issues with another PC, so I ...
4
votes
1answer
717 views

Max ram for computer 16GB or 8GB

Manufacturer's specifications for my notebook say memory can be extended from 4GB to 8GB. Whereas, running sudo dmidecode suggests the computer can use 16GB as below: Handle 0x0037, DMI type 16, 15 ...
4
votes
1answer
4k views

How can I check how much space there is left on WUBI versus how much space it takes on my HDD?

Using 11.10 for the record. It would be easiest to do it on the Terminal.
4
votes
2answers
3k views

How to use a compressed ramdisk (ramzswap)? Huge speed gain

Since I don't use my laptop's CD-drive I want to put a small (8 GB) SSD into the CD-drive slot (I'll use a caddy similar to this one). I want to use compressed btrfs on the SSD and put all the data on ...
4
votes
2answers
3k views

Change swap memory size after adding RAM?

I ordered some addon RAM a few days ago to install on my Ubuntu 10.10 stationary computer and while giving it some thought, I remember that I previously did change the SWAP memory file size on a XP ...
4
votes
1answer
1k views

laptop crashed: why? [closed]

my linux (ubuntu 12.04) laptop crashed, and I am trying to figure out why. # last sds pts/4 :0 Tue Sep 4 10:01 still logged in sds pts/3 :0 ...
4
votes
2answers
697 views

2 GB Ram, but Ubuntu runs slowly and hangs if doing too much

I think my system more than meets the minimum/recommended requirements for Ubuntu, but its still running slowly. Especially when I try to multitask by having 4-6 windows open, then it becomes quite ...
4
votes
1answer
3k views

How to give more RAM to wine Applications

Hi I think my system is not allocating enough RAM to WINE applications . I am using WINE to play games but they are loading slowly and RAM usage is normal. So how can I improve reserve memory of WINE? ...
4
votes
3answers
699 views

Installed 11.10, but it's not detecting all 8GB of RAM, only 3.9GB. BIOS sees 8GB

Just installed 11.10, but it's not detecting all 8GB of RAM. System Info says there are 3.9GB. Bios doesn't have a problem recognizing all 8. free -m results in: total used ...
4
votes
1answer
263 views

Ubuntu gets slower by the day

Ive noticed that Ubuntu has been getting slower and slower to boot, launch programs, etc. I installed 12.04 about 4 months ago,now 12.10, running on a quad-core Q8300 Intel, 4GB Ram, and an 80GB WD ...
4
votes
2answers
2k views

large tmpfs /run partition - must it be so big?

I am running Ubuntu 11.10 desktop on a couple of 8G RAM Wintel boxes. Both have been created automatically by the default installer with a 1.6GB tmpfs /run partition, where I suspect this amount of ...
4
votes
1answer
357 views

What is the normal metacity and nautilus memory consumption?

uptime 07:07:32 up 13 days, 4:01, 2 users, load average: 0.47, 0.28, 0.21 System Monitor shows that metacity uses 1.2 Gib and Nautilus 450.1 Mib. Everything has gotten pretty slow-ish so I ...
4
votes
2answers
1k views

Ubuntu 13.10 freezes at times; *ERROR* stuck on render ring

My ubuntu 13.10 laptop freezes relatively frequently, after I recently installed it. It is most common while I am playing Minecraft, but I have also had it happen at other times. I think it may be a ...
4
votes
1answer
4k views

Why doesn't Ubuntu detect all of my RAM on 64-bit? [duplicate]

Possible Duplicate: Ubuntu only detects 3.1 GB of ram on Ubuntu 64 bit ISSUE IDENTIFIED: BIOS bug. See dmesg output below. Question is: How to resolve this? Change made since 2.6.32 have ...
3
votes
6answers
25k views

Is there a program that tells ram usage? [duplicate]

Possible Duplicate: How can I monitor the memory usage? I have Ubuntu 12.4 LTS and I need a program that will be able to monitor my ram usage. Any suggestions?
3
votes
3answers
1k views

When I have 6 GB of RAM installed, why is just 3 GB available on Ubuntu?

I'm using a laptop with 32-bit Ubuntu 10.04. I used to have only 2 GB of RAM. Today, our IT-support upgraded my laptop to a total of 6 GB of RAM. They told me "Though you do now have 6 GB, when you ...
3
votes
4answers
11k views

Using usbdrive as ram in ubuntu

In windows it is possible to use usb flash drive as a virtual ram. I wonder if it is possible to do so in ubuntu? If it is, how could one do it? [Edit]: I mean Ready boost equivallent for ubuntu. I ...
3
votes
2answers
2k views

tmpfs vs. ext4 ramdisk

I would like to know which of both is faster; a tmpfs or a ext4 ramdisk. If someone knows a good way to benchmark disk perfomance on ubuntu, I will gladly do the test myself and post the results. ...
3
votes
3answers
3k views

Will adding more RAM increase my computer's performance?

I am looking to increase my computer's performance. Will upgrading my RAM by 12GB or upgrading to a 7,200 RPM Hard Drive increase my computer's performance more? I can only do one, which one will make ...
3
votes
2answers
212 views

When your web server starts paging memory to disk and slows to a crawl, what's the best way to recover?

I've been shutting down and restarting the server, but is there something short of that you can do to quickly recover from a high-paging situation?
3
votes
4answers
354 views

Execute a script when memory peaks?

I don't have a lot of memory and sometimes, when I play video games, its get full and my computer start freezing, anything I do take more than 1 minutes before getting done that include mouse move and ...
3
votes
1answer
4k views

Good way to run Java and Eclipse from a ramdisk

It is often suggested to me that to improve the performance of the Eclipse development environment, that I should move the Java JDK/JVM (and possibly Eclipse) to a Ramdisk. I know that the Ubuntu has ...
3
votes
1answer
1k views

How to give all available resources to VirtualBox?

Is there a way to push all available resources to the program(VirtualBox) when running Ubuntu?
3
votes
1answer
1k views

How to impose memory limits to a shell script?

I have a PHP script that while a folder contains XML files, it will process them onto the database. Currently, the server is running the PHP version 5.3.10 and there's a bug report about memory ...
3
votes
2answers
2k views

Memtest86: Has my RAM gone bad?

I did a memory test with memtest86 on boot, and I'm seeing this: Is my RAM defective? PS : My Ubuntu PC doesn't boot. Shows options in GRUB and then says there are errors in / and failed loading ...
3
votes
2answers
2k views

Does Ubuntu support 8Gb of RAM?

I've a motherboard that can accept 8G RAM, But Window only see and use 4G RAM. If I put in my 8G RAM sticks, Will installing a 64bit version of Ubuntu really access most of the 8G's, Or is this a pipe ...
3
votes
1answer
199 views

Which processes with daemon are unnecessary?

I saw 3 processes which have "daemon.py" at the end of them and use 10 MB of memory each of them. What do they make? Also there are a lot of processes which have daemon inside. Are they really ...
3
votes
1answer
1k views

How to increase the disk space of an Ubuntu VMWare guest, without the cd?

I powered off the VM and on the VMware side increased the allocated disk space. I did this by Edit Virtual Machine Settings -> Hard Disk -> Utilities and so forth. It then warned me that I should ...
3
votes
2answers
1k views

Used memory in Linux? [duplicate]

Possible Duplicate: How can I monitor the memory usage? I see in System Monitor, used memory only 332MB, so free memory is ~3.4GB, but when I use command line: free -m, used memory is 1GB, ...
3
votes
1answer
984 views

zeitgeist-daemon excessive RAM usage

I have installed last week Ubuntu 11.04 64 on a new machine. I am running the GUI using Unity. However I have noticed that after 1-2 hours the process zeitgeist-daemon starts using excessively the ...
3
votes
1answer
2k views

Moving files to /dev/shm ramdisk doesn't increase RAM usage?

I've been wanting to make us of a ramdisk on my Ubuntu system for a while, and have done a bit of reading online. Most of the advice centres around using /dev/shm to move files into RAM. I wanted to ...
3
votes
4answers
1k views

what is the nm-applet and why does it take so much memory?

I was wondering why my memory useage was so high, what is this thing that take a whopping 1.2GB of memory. Please and thank you.