Debian :: How Debian 5 Manage Physical Memory
Jan 1, 2011i need some information about how Debian 5 manage the physical memory . such as the memory management algorithms. i have googled it a lot but i couldn't find it.
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Server :: Clear Cache Memory ( RHEL 5.1 ) As It Consumes Almost 100% Physical Memory?
Jan 11, 2010let me know how to clear cache memory ( RHEL 5.1 ) as it consumes almost 100% physical memory.
View 3 Replies View RelatedDebian Configuration :: How To Best Manage Partitioning When Install Programs Not From Debian Repositories
Dec 4, 2010How to best manage partitioning when install programs not from debian repositories?I just discovered that Debian installs applications not from repositories to /opt and /lib. Both directories or folders reside in root (/) partition.Having made my root (/) partition (which is only around 500MB) -- more than sufficient for holding a couple of linux images but NOT good for holding application.What is the best solution for resolving this? It's annoying and worrying that my system always reminds of a close to full capacity root partition.
View 7 Replies View RelatedHardware :: Why Dmesg / Grep Memory Gives Two Different Physical Memory Amounts
Oct 20, 2010I am monitoring physical memory in a server I administer, and my hardware provider told me they had increased physical memory size to 4Gb... However, using several tools (free -m; top; dmesg | grep Memory; grep MemTotal /proc/meminfo I discovered that I actually have 3Gb, not 4... But, my doubt comes from the fact that dmesg | grem Memory tells me I have 3103396k/4194304k available The first number is effectively 3Gb, but the second one, is 4! so, why I am looking at this two different numbers?
View 1 Replies View RelatedDebian Installation :: Moving Debian Install From Virtual Machine To Physical
Feb 20, 2010I have been learning Debian by using a virtual machine. After fine-tuning my installation procedure, I decided to copy that installation to my physical system. The hard drive already has another Linux based system installed. I plan to dual boot.After copying files I updated fstab and menu.lst.The partition scheme between the virtual and physical environments are similar, but the partitions are not mapped exactly the same.Thus the Debian system on the physical hard drive fails to boot simply because the initrd is created for the root partition location on the virtual machine. The initrd created in the virtual machine is looking for the root file system on /dev/hda1 whereas on my physical drive the new location is /dev/sda7.How can I rebuild the initrd on the physical system? I started to use the installation DVD in rescue mode, but I did not get too far.
View 6 Replies View RelatedDebian :: Moving Debian From Virtual System To Physical
Feb 19, 2010I have been learning Debian by using a virtual machine. After fine-tuning my installation procedure, I decided to copy that installation to my physical system. The hard drive already has another Linux based system installed. I plan to dual boot.After copying files I updated fstab and menu.lst.
The partition scheme between the virtual and physical environments are similar, but the partitions are not mapped exactly the same.Thus the Debian system on the physical hard drive fails to boot. I think the initrd created in the virtual machine is looking for the root file system on /dev/hda1 whereas on my physical drive the new location is /dev/sda7.How can I rebuild the initrd on the physical system? Or how can I build an initrd in the virtual system that will function on the physical system.I started to use the installation DVD in rescue mode, but I did not get too far.
Debian Hardware :: Debian Squeeze Memory Amount Incorrect?
Feb 23, 2011Fresh install of Debian 6.0 (squeeze) and the memory shows 3.8 GB. I have 6 sticks of 2 gb on the board.
Pertinent dmesg lines: AMI BIOS detected: BIOS may corrupt low RAM, working around it.
3083MB HIGHMEM available.
883MB LOWMEM available.
Bios tests 12 gb of ram fine.
Programming :: Data Structure To Manage Memory?
Oct 1, 2010I have a mxn matric (which is my simplified way of saying it is RAM with bytes on it) Some of the locations on this metric is filled with some data and some places are empty. The mxn are very big numbers in size. I am trying to make a program so that if a system call wants to write some thing on empty locations on this mxn metric it should be able to do so without any problem. The thing which I want to understand or logic of a data structure is what data structure do you people feel should I be maintaining so that I can allocate the requested space immediately from the above mxn matric when some system call requests for some (k) number of locations from above metrics.
The logic initially I thought was to maintain a hashtable
1bytes requested----------> location 1,location 2,location 3.........location n
2bytes requested----------> location 1,location 2,location 3.........location n
3bytes requested----------> location 1,location 2,location 3.........location n
[code]....
but the problem with above logic is size of the pointers where I will be writing this problem is unsigned 64 byte.So to know location of one free byte if I am maintaining one pointer of type u64 this is not a feasible solution.
Programming :: Manage Memory To Speed Up Program?
Nov 18, 2008I wrote a program in lcc in windows and I have to write it in gcc in unix. In lcc there was an option to use more memory than the default for the stack. The following code is working in lcc but in gcc it gives segmentation fault:
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <time.h>
int main()
{
Hardware :: How To Increase Physical Memory
Jan 23, 2011I'd like to ask you how install new physical memory in my hp ml350 g6 server with linux redhat operating system>
i sugess it is easy like in windows operating system but there is frind told me you must make mount , i am new with linux os .
General :: Configure Physical Memory Map?
May 18, 2010I am trying to build and bring-up Linux (embedded) for a piece of hardware which have MIPS 74K proccessor 16MB Flash, 128MB DDR and network/usb support. How to configure/set into the kernel the exact addresses of the physical memory map? How does the kernel know where is the system ram, i/o memory, root FS? I have read some book and I found how the applications can go and read some special files like /proc/iomem to find out info about memory but what I need is how to set those addresses at the beginning when I build the kernel and FS in order to boot the kernel on my h/w.
View 3 Replies View RelatedDebian :: Gui In XFCE To Manage Users And Groups?
Aug 26, 2011Running Wheezy with an XFCE desktop. Is there anything I can install to manage users and groups from a gui
View 2 Replies View RelatedDebian Multimedia :: How To Manage KDE Panel / Taskbar
Jan 30, 2016I tried Google and searching here to no avail...
Running Debian Jessie 8.3
Linux 3.16.0-4-amd64
KDE SC Version 4.14.2 with plasma
I am trying to remove some icons from the "taskbar"/panel and find the only real options are adding MORE widgets, adding another panel, or deleting the whole panel.I simply want to remove a duplicate and re-arrange the icons without having to delete the panel, add another panel, and careful add, in the order I want the icons, the widgets right-click on the panel and I get "Task Manager Settings ALT+D,S" and "Panel Options" which offers no visible means of managing the panel.I condemned to deleting the panel and starting over?
General :: Why Set Swap Space Twice Big As Physical Memory
Sep 12, 2010When we want to setup a linux system, there is a common a suggestion like set the swap space as twice as big than your physical memory, I want to know why do we need this and how is this suggestion come from?
View 4 Replies View RelatedGeneral :: Get The Physical Memory Used By A Couple Of Processes?
Sep 3, 2010I am doing a test to get the memory used by apache`s apache2 processes. I used a script to get VmSize and VmRss from /proc/pid/status, and loop through that to get the sum of VmSize and VmRss of all the apache2 processes.
I found the VmSize (about 4GB) and VmRss (about 3.4GB) are much larger than the physical memory (1GB) when apache server was saturated. It was said because of the multi-counted libiraries size used by many processes simultaneously. Then , how to get the physical memory used by apache2 processes? Or how to get a more reasonable memory data?
Server :: Why VMrss Is Larger Than The Physical Memory
Aug 30, 2010I got the VMrss used by a process as about 2GB, but the physical memory of my computer is only 1G.
View 10 Replies View RelatedSlackware :: Prioritize The Use Of Physical Memory Instead Of Swap?
Oct 24, 2010I have a system with 2G of memory and swap memory of 4G.
This is the output from :
PHP Code:
How could they do to the memory cache to be used as much? Because, occasionally, swap is used and note that the system could use the memory cache does not swap ...
Slackware current 64 multilib.
Debian Configuration :: Manage GNOME Keyrings In Wheezy?
Jun 8, 2011Last week I upgraded from Squeeze to Wheezy. Everything seems to be in order, except now launching empathy will get my 4 separate GNOME keyring prompts in a row. I guess my keyring got copied for some reason, but I can't figure out what package to install to deal with my keyrings, as gnome-keyring-manager is only in sid...
View 2 Replies View RelatedDebian :: Manage Clients Over Central Management System
Sep 16, 2010We would like to setup Lenny (Gnome) clients and need Desktop Mgmt Software, to manage clients over central management system.
View 1 Replies View RelatedServer :: Manage Files And Sites With Debian System
Feb 1, 2011I have a linux server with debian system. I want to put in my debian server a site. I installed apache php mysql and phpmyadmim. I really thought that was more difficult for me to put my site database. But now i can load on server my database with phpmyadmin after a very simply installation. I could not believe. I'm studying how make ftp work (apt-get site-ftp?) and waiting from my host directadmin installed. But i try to manage linux console and was very exciting for a newbiest like me!
Now I can write text on my site server with echo etc,etc, I have a database, but I have not site files. While I was studying tutorial to make apache work, I frequently read the directory /var/www and my debian console confirm that is an existing directory. How can use this directory?
Any listing debian linux server commands to:
copy, delete, paste from my pc desktop a file TO folder /var/www ?
It is possible without ftp? Another question. Which bad errors can make a newbie like me configuring apache with linux? I ask this because I read all where that I could not manage a server system if I'm not a sysadmin, but I have only to put in a site... what the real risk?
General :: Virtual Address To Physical Memory Access ?
Feb 21, 2010A process is trying one access to memory, for example through an array (ex.: vect[0]=123. What happens?
Here below what I guess but I'm not sure and accept any comment (please, distinguish between "the system" and "the CPU" in case).
Let's suppose swapping to disk disbled.
We have two scenarios: without and with cache.
If no cache is present in the system:
1. The CPU must discover the phys addr of vect[0] virtual addr. To do that, has to read from 3 (or 2 depending on the system?) pages tables, stored in memory as well.
2. The CPU writes to the final address.
These mean 4 memory accesses.
If cache is present:
1. Like above but, if the pages tables are in cache, we have 3 accesses to that.
2. If the req. page is not in cache, it's reads from ram and transferred to it. Afterwards, cache is written.
In the best case we have 4 cache accesses.
Hardware :: RHEL5.3 Is Not Showing Total Physical Memory?
Aug 27, 2010I have rhgel5.3 installed on IBM blade server having 16 GB of physical memory. But it showing only 4GB.
#cat /proc/meminfo
#free -m
#top
[code]...
General :: Physical And Virtual Memory Upper Limit For 32 Bit?
Jun 26, 2010I have a 32 bit Ubuntu installed and my Laptop has 4GB RAM, but only 3GB is considered by Linux. My question is: what is the reason for the upper limit on physical memory ?
Code:
dmesg | grep Memory [0.000000] Memory: 3052428k/3112960k available (4673k kernel code, 56364k reserved, 2121k data, 656k init, 2200904k highmem) I am familiar with the virtual memory concept where linux splits upper 1GB for kernel and lower 3GB for user processes. In total, linux 32bit can address 4GB virtual addresses. Does this meant that 1GB of physical memory is already mapped to 1GB of kernel space and Linux only shows the remaining 3GB physical memory left for the user in the above command.
I did some searching on the internet and found some articles related to this, but it only confused me further since some articles suggest 4GB is the upper limit with mentioning whether it's virtual or physical memory, some bring in the concept of PAE, etc. I'm relative new to Linux's memory management, so it'd be really helpful if someone could answer this.
Server :: Free Physical Memory Available Then Why Swap Space Used
Jun 20, 2010Why linux uses swap space, even if there are free physical memory available.
View 4 Replies View RelatedServer :: Physical Memory Lost After Running SOSreport?
Jan 2, 2011Before running SOSreport, the free physical memory is 5389Mb out of 8Gb.
After running SOSreport, the free physical memory is 3229Mb.
Why is this so? how we can free up the physical memory.
Debian Multimedia :: Compiz Failed To Manage Screen After Upgrade
Jun 16, 2011I have upgrade my debian sid and after the new kernel update, xorg can't start because I need to rebuild the module. After the build, xorg start, but not compiz, who say :
[cubox@cubox-fixe:~]$ compiz (core) - Fatal: Root visual is not a GL visual
compiz (core) - Error: Failed to manage screen: 0
compiz (core) - Fatal: No manageable screens found on display :0
Launching fallback window manager
OpenSUSE :: Created A Tab To Look That The Physical Memory In The System? Monitor Program?
May 11, 2010I have a system with 1 GB RAM. I'm running KDE 4. I created a tab to look that the Physical Memory in the System Monitor program, which I assume appears to look at the same stats that "top" looks at. In that Physical Memory tab I have 3 tables: Used Memory, Free Memory, and Application Memory.The Used Memory table shows that the system is using .94 of .98 GiBytes. The Free Memory table shows that the system has .5 GiBytes of RAM free.
However the Application Memory shows that only 339 M-Bytes of RAM is being used.Note that "top" shows the same info.So where is the other .6 GiBytes of RAM that the Used Memory table shows as being used?If I look at the process table which is supposed to encompass all of the processes running, including the ones for the OS, then it appears to add up to the 339 M-Bytes being used in the Application Memory table. Is the rest of the memory being held in reserve by the OS to be used as needed? If so, then why when another application is opened the Free Memory goes down instead of staying constant?I also noticed this memory "black hole" when I was running 11.0 on a system with 4 GB of RAM. The OS appeared to "take up" a large chunk of memory that was NOT being used by any applications and making it "disappear" - meaning that the applications were using about 1.3 GiBytes of RAM and Free Memory was showing only .7 GiBytes instead of the over 2 GB of RAM that should be free.
Programming :: Find Physical Address Of Memory Provided By Kmalloc
Oct 22, 2009I allocated a chunk of memory using kmalloc in a Device Driver. Kmalloc provides a pointer to the allocated memory. This is one of my first few drivers.
I assume that the address returned is a Virtual address. I need to find the physical address of the memory location. I am working on an Intel 64 bit Fedora machine. I used the virt_to_phys() routine present in <asm/io_64.h>. I found that this routine returns an unsigned long value (32 bit) instead of an unsigned long long value (64 bit). Moreover, it seems that it simply returns the address - OFFSET instead of extracting the value in the page tables.
So is there any function / system call in Linux which will allow me to see the actual physical address on the Intel 64 arch.
Debian Configuration :: Can Migrate From Virtual Machine To Physical System?
Oct 6, 2015I've been experimenting with Debian coming up with a system with suits my needs. I have done this and I'm wondering, "Do I have to start from scratch on my physical machine or can I convert an existing VDI to IMG and possibly port it to the physical machine?"
System: Debian Testing
General :: Mapping Kernel Virtual Address Space To Physical Memory Zones?
Nov 4, 2010As i undertsand - out of 1GB of the virtual Address space for Kernel from 3GB to 4GB of the process address space, Kernel image (code, data, bss, stack, heap) resides staring @0x0 address. Vmalloc area starts either at the end of Physical ram size or at 896M. This 896M cap is mandated to ensure that minimum of 128MB is reserved as vmalloc_reserve for vmalloc,kmap etc.
Is the understanding correct? Now trying to map Physical Zones into this 1GB address space
Initial 16MB is mapped to ZONE_DMA
16MB - 896MB is mapped to ZONE_NORMAL
896MB - 1024MB is mapped to ZONE_HIGHMEM
Does this mean that Kernel image is residing in ZONE_DMA area? Any call to vmalloc() in kernel code will return address beyond 896M? insmod of any LKM will internally invoke vmalloc() to obtain contiguous area - where will this code physically located along with rest of kernel code in ZONE_DMA or in ZONE_HIGHMEM?