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.
21
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5answers
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Why does Ubuntu only show 3GB of RAM?
I have an Asus G50vt-x5 laptop with 4GB of RAM installed. But Ubuntu 10.10 shows only 3GB of RAM. Why is it only showing 3GB of RAM instead of the full 4GB?
output of free command is :
neal@ubuntu:~$ ...
74
votes
17answers
24k views
I have 16GB RAM. Do I need 32GB swap?
I read many places that the rule of thumb for swap space is to double the amount of physical RAM. However, 32 GB does seem a LOT. Do I need that much? Do I need it at all with this high amount of ...
24
votes
1answer
28k views
14
votes
5answers
15k views
7
votes
3answers
3k views
Why is more than 3GB of RAM not recognised when using amd64?
Why does Ubuntu 10.10 amd64 not addresses more of 3GB ram? Please if somebody knows about that, tell me the solution.
My machine is a Toshiba P205-S6287 Intel centrino duo 64 bits procesor and 4GB ...
6
votes
1answer
1k 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 ...
16
votes
3answers
4k views
What is a segmentation fault?
In Ubuntu I have faced the segmentation fault error many times. What is a segmentation fault and when does it occur?
8
votes
1answer
3k views
Ubuntu detects only 3.2GB RAM on a 64bit OS [duplicate]
Possible Duplicate:
Only 3.2 Gb of memory being used on a 64-bit system
I have been running 64 bit version of 11.10 which was upgraded from 11.04 and wasn't a fresh install. I earlier had ...
12
votes
2answers
2k views
Memory limiting solutions for greedy applications that can crash OS?
I use my computer for scientific programming. It has a healthy 8GB of RAM and 12GB of swap space. Often, as my problems have gotten larger, I exceed all of the available RAM. Rather than crashing ...
13
votes
6answers
11k 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 ...
2
votes
1answer
2k 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.
6
votes
2answers
4k views
For a 32-bit kernel, what are the pros/cons of PAE vs. non-PAE?
I am using Ubuntu 12.04 32-bit. My kernels are PAE kernels. I know these are the kernels we can use for 32-bit OS which have 4 GB RAM, to utilize all 4GB of RAM.
My system is a 32-bit system. So I ...
8
votes
3answers
5k views
How to permanently enable compressed ram swap? What version to use?
EDIT: In precise there's now zram-config. It's an upstart job compressing up to half of your ram spread over $(number of CPU cores) swap devices. It didn't allways start at boot but issuing sudo ...
18
votes
6answers
2k views
8 GB RAM on 64 bit processor using 32 bit Ubuntu
I'm going to repeat the title in a longer word. Can a 32 bit Ubuntu address more than 4 gb of RAM on a 64 bit processor?
3
votes
4answers
7k 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. ...
25
votes
5answers
4k views
Drawbacks of using preload? Why isn't it included by default?
I would like to know what are the drawbacks of using preload? If there would be no downside, preload would be enabled by default, so I guess there are some.
Okay you need a bit more RAM, but most ...
11
votes
3answers
4k views
How to create RAM drive?
How do i create RAM drive under ubuntu. And would he automounted at startup?
4
votes
2answers
2k 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 ...
3
votes
4answers
712 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.
3
votes
2answers
1k views
Can I use all my RAM for application data?
I have yet another question about "where is my Linux memory"
Question goes: can I use cache for application data?
On my laptop I have 1GB ram. Situation after some time of work: browser takes 400MB ...
2
votes
1answer
290 views
Can i automatically kill any application that uses more than a certain percentage of the CPU and/or RAM?
What i need from my computer, now that it's summer at least, should never use a lot of resources - when applications do so it's because of some kind of bug or memory leak.
Is there any way to ...
7
votes
6answers
1k views
How to determine where biggest files/directories on my system are stored?
I was wondering how do you know where the largest files in my system are stored.
For example---
Disk Space Used: 1GB
Java: 500MB
Java Percentage: 50% maybe represented in a pie chart. Maybe?
I know ...
4
votes
4answers
8k 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 ...
4
votes
1answer
3k 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
2answers
12k 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: ...
1
vote
1answer
1k views
Ubuntu only detects 3.1 GB of ram on Ubuntu 64 bit
I am using Ubuntu Linux 64 bit. Recently, I was using Ubuntu 32 bit, and discovered through the command grep --color=always -iw lm /proc/cpuinfo that my processor is capable of 64-bit. The output of ...
14
votes
2answers
1k views
Is it possible to query maximum ram my mobo takes?
Is it possible to query through Terminal how much ram my motherboard can take?
I'm looking to see if i can even upgrade.
5
votes
2answers
2k 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 ...
6
votes
5answers
6k views
How do I use zRam?
I installed zRam as described on webupd8.org. I installed it from the terminal. Is that all I have to do or do I have to do some configuration or something? Does the zram-enabler do everything by ...
6
votes
1answer
6k views
How can I use RAM storage for the /tmp directory and how to set a maximum amount of RAM usage for it?
After seeing the comment by Anonymous on this question: How is the /tmp directory cleaned up? I found it a great idea to implement on my system, since I have 16GB of RAM and I never used all of it.
...
4
votes
2answers
405 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 ...
13
votes
3answers
11k 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 ...
4
votes
2answers
134 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 ...
8
votes
2answers
5k views
How to stop the Unity Desktop [duplicate]
Possible Duplicate:
How does one exit the X server?
I would like to shutdown the graphical interface and every related graphical application on my Ubuntu 11.10 (with 4 GiB memory and 4 GiB ...
6
votes
2answers
332 views
How to configure how much RAM usage should to start swapping on Ubuntu
I always notice that Ubuntu start using swap, as soon as the RAM usage is around 60-70%.
How to configure it so it should wait so RAM usage became 80-90%.
And is there a way to empty the swap, as soon ...
5
votes
2answers
603 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.
3
votes
4answers
328 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 ...
2
votes
4answers
5k 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 ...
8
votes
9answers
1k views
What are the available browsers for 128 MB of RAM PC?
Running 12.04 with VirtualBox and I set it for 128MB of RAM. I cannot use more than 128MB of RAM.
Since the browsers I know like Firefox, Google Chrome and Chromium seem to eat more RAM, could ...
4
votes
0answers
886 views
Error when running memtest86+ [closed]
I just installed Ubuntu 11.10 on a 64-bit PC. When I try to check RAM with memtest86+, I got this error: unknown command linux16. I also tried to load memtest86+.bin with linux command, but I got ...
3
votes
2answers
6k 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 ...
2
votes
3answers
2k views
Why is my system showing Less Memory (RAM) than is actually installed? [closed]
Yesterday I bought a new laptop with 4GB RAM. When I installed Ubuntu 11.10 (beta) it is showing 1.5GiB (2GB-512MB graphics) ignoring the 2GB.
uname -a:
Linux js 3.0.0-11-generic-pae #17-Ubuntu SMP ...
1
vote
1answer
191 views
Ubuntu installation in VirtualBox - not using base memory in RAM
I am installing Ubuntu right now under VirtualBox in Windows 7. It is going extremely slow and VirtualBox is only using about 128 MB of RAM out of the 1024 MB I set as Base memory to it.
Is it ...
1
vote
2answers
592 views
Ubuntu detects only 3.6GB RAM (of 8 gigas) on a 64bit OS (11.04 )
The BIOS detects it fine and shows 8GB. Even lshw shows 8GB memory but somehow only 3.6GB is usable.
Output of uname -a
Linux Prod 2.6.38-15-generic #59-Ubuntu SMP Fri Apr 27 16:03:32 UTC 2012 ...
1
vote
2answers
1k views
12.04 64bit detects 7.7 GB Of RAM Out Of 8 GB
I've Dell Inspiron N5110 with 8 GB of RAM, I installed Ubuntu 12.04 64-Bit.
The problem is that all things are working fine but Ubuntu detects only 7.7 GB of RAM, I've checked & noticed that I've ...
1
vote
1answer
679 views
Computer crashes (segfaults?) after upgrading from 1GB RAM to 2GB
I have a HP Compaq Presario F500 (an F579WM). I replaced the 1GB(2x512MB) of RAM in it with 2GB(2x1GB). Since this upgrade the computer will switch to a text screen, with what looks like a backtrace ...
1
vote
2answers
1k views
System Monitor and top reporting wildly different memory usage
Lately, while browsing, I often get that the computer comes to a crawl. At the same time I notice memory consumptions of close to 90% by programs/ 10% as cache as indicated by the System Monitor ...
0
votes
2answers
57 views
How do I change how much disk space Ubuntu has?
I installed ChruBuntu on my Chomebook Acer C7 about 2 weeks ago and I chose to allocate 10 gigs. I didn't know that that would be my amount of disk space I would be allowed to use. I want to install ...
0
votes
0answers
168 views
xubuntu 12.04 boot issue
I finally go a distro of ubuntu (xubuntu 12.0.4) installed on my old laptop. After the restart the GRUB menu appears and I pick my install then all that shows is
[9.274169] [drm:drm_mm_takedown] ...
0
votes
0answers
359 views
Eclipse: Constant, different out of memory errors
I'm having trouble with my Eclipse (or more likely with my java vm) at the moment.
After 5 min of running Eclipse, I'm having constant (different) 'out of memory' errors, mainly saying 'collecting ...
