Fedora Hardware :: Cannot Use All Of System Memory?
Jun 6, 2010
I just installed Fedora 13 onto a "new" (to me) box, and everything seems mostly fine, except that I only seem to be able to use about 900.2 MiB of 991.4 MiB of RAM memory, according to System Monitor. I haven't set up a swap partition yet, so the problem became very, very, very obvious. When I get to about 890 MiB usage, everything goes very quickly downhill, locking up, etc. The peak I saw was 900.2 MiB. What's going on? Does this have anything to do with the system being 64-bit? Might the memory be bad?
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May 22, 2011
I have worked in linux for a long time but never managed the system until I got my own server, which is running Fedora 14. I have a 3 TB Drive and apparently can only handle 2 TB. At least the Disk Analyzer is telling me that 2TB is 100% max capacity. Also viewing disk analyzer, I am only using 50GB of my 2TB but I am out of memory in the Root file system. If I run df -h, I get he following:
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_dev1-lv_root
50G 40G 7.2G 85% /
[code]....
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Jul 18, 2011
I had Fedora 13 64 bit before which was correctly reporting memory as 4GB. After I wiped off Fedora 13 and did a fresh install of Fedora 15 32 bit, the memory is reported as 3.2 GB in the system Info and also in free -mt command code...
Where is 600MB memory gone missing? I checked the BIOS setting and it correctly says total memory is 4GB.
The hardware is exactly same and I did not change anything.
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May 9, 2009
I have been using for over a year now, my 64-bit computer first with Fedora 8 and now with Fedora 10 with 2Gb of RAM just fine. Today I purchased an extra 2Gb for the system and upon installation from the GRUB screen Fedora 10 simply won't boot. It does boot with 3Gb, and it doesn't matter which stick I use for the 3Gb configuration, or what slot do I put the sticks into the motherboard, however if I place the four sticks, F10 simply won't boot. Should I pass a command line argument tot he kernel? If so, which?
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Jun 24, 2009
i have a RAM of 1 Gb & swap of 1Gb with fedora11 installed, initially in RAM programme memory uses around 300 Mb & cache uses 600-700 Mb , but after some time it starts using swap memory though my programme memory is still around 300 mb, it keeps on increasing swap memory as a result my system keeps on slowing down & finally when swap memory is 100% system almost stops responding but programme memory is still around 300mb.
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Dec 5, 2009
I just noticed this in my "df" output:
[Code]...
There's an entry in /etc/fstab which mounts this automatically. If I interpret that correctly, that's a 224 mbyte ramdisk that is consuming 224 mbytes of system memory whether or not I use it. Is that correct? If so, will anything break if I unmount it and delete it from /etc/fstab? Do programs typically depend on it? I'd like to reclaim the system memory (low DRAM machine) for other uses.
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May 5, 2011
My server is keep on hanging So I have rebooted several times in the last couple of weeks, the system is eating more memory and the usage is keep on increasing and at particular time it became saturated and my server hungs. I could not find which process is eating more memory. I have used the below commands to check if any process is eating more memory but no luck. No such process are using high memory.
1) Top
2) ps -eo pcpu,pmem,user,args
[Code]....
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Apr 20, 2011
Is there a system admin tool for RHEL on montioring and logging system memory used and released that can dump to a log file?I'm having an issue with memory not being released when an application is closed. I need to have a tool monitor and log so I can troubleshoot to verify that it's an application not the OS.
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Feb 7, 2011
Fedora 14 xfce
HP Mini 210
I am looking to buy some memory for my netbook. Currently I have 1 GB of DDR3 memory. However, the specification says that 2 GB of memory is the max. However, when I do the following it says that 4GB is the max:
[Code].....
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Aug 4, 2010
I have Mythbuntu 10.04 installed on an exclusive HTPC and working great... until tonight. After letting the system update some packages (161 packages if I remember right), I suddenly have an issue where the graphical system won't start. After researching I found three error messages that might be causing that.
1. At the start of splash screen I see "UUID=xxxxxxxCD7 not ready yet or not present" I checked in /etc/fstab and found that this is the swap partition. I don't remember seeing this before so this could be the culprit.
2. I'm not at the computer in question right now but I saw a Plymouth error about "mountall" and then the message "plymouth command failed". Not sure if this could be the main error.
3. after a while (usually ca. 1-2 min) I receive thousands of errors of the kind "out of memory"... "kill process XXXX" (process vary wildly e.g. dbus-daemon, mysql, etc)... "process killed"..."respawning"
After error 3, I'm not able to switch to graphical console (ctrl-alt-F7). If I was in the graphical console at this moment, I simply can't switch to the CLI console. I'm always afraid of updating my system since I've seen lots of things breaking afterwards (usually the proprietary graphic drivers) but this is really strange.
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Feb 21, 2010
I need a Linux distribution which has got drivers for pendrives and could play the music.
What version could you recommend for me?
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Feb 26, 2010
Can I add memory to the Linux box without rebooting the system? I think Linux check the hardware at booting time. But if I need to add more memory to the server while I do not want to stop the service. Is there some method to make Linux use the new added memories?
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Mar 29, 2011
I have a new lenovo thinkserver hardware. I was configuring my newly installed kernel (slackware 13.1 - kernel 2.6.33.4) maybe to weeks now. I was testing the configuration of the kernel parameters.Suddenly out of the blue my BIOS started to report memory error. I have 6 Fully buffered memories in pairs. Four has no advanced ECC and two supports ECC.It is possible to damage the memory by some wrong kernel configuration???I cannot believe that this is possible but I cannot see any other explanation how can a two weeks old hardware get wrong.
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Jan 26, 2011
I have 4G memory, but linux can only detect 3.5G. The graphics card is a 128M one, even if this is shared there should still be more than 3.5G memory.
What is the problem in here? code...
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Mar 16, 2011
I use a Debian Squeeze system running off a flash drive, i.e. based on a custom Live image running in persistent mode. It runs great and I am grateful for the existence of Debian . However, I have a question. A lot of the machines I use this pen drive on are quite old, often with 512 MB RAM and old processors. I specifically built my system using XFCE and lightweight apps off an initial live image using the standard-x11 package list (basically just Xorg with drivers and the base system). At first things ran very well, blazing fast even on the oldest systems and could comfortably run Firefox along with LibreOffice side by side (I need LO as all of my colleagues use Word docs, often with track changes, which Abiword can't handle properly). However, over time, I've found that memory usage has risen, tot he point where Firefox is now automatically killed on the older systems every time I start LibreOffice.how does one figure out why memory usage is going up? I've checked for inessential services and turned them off with "insserv -r". I've used only lightweight apps, as mentioned before. Are there other general tips on reducing memory usage?
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Nov 11, 2009
I have a server running samba process and there are about 70 samba users connected at a time. The system has 4Gb of memory and it seems each samba process is utilizing only 3352Kb of memory.
When I run the command
pmap -d (pid of samba)
It gives as:
b7ffa000 4 rw-s- 0000000000000000 0fd:00003 messages.tdb
bfe46000 1768 rw--- 00000000bfe46000 000:00000 [ stack ]
ffffe000 4 r-x-- 0000000000000000 000:00000 [ anon ]
mapped: 33384K writeable/private: 3352K shared: 20504K
But when I run the top command, it results as below:
Tasks: 163 total, 1 running, 162 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.9% us, 4.9% sy, 0.0% ni, 93.3% id, 0.8% wa, 0.2% hi, 0.0% si
Mem: 3895444k total, 3163192k used, 732252k free, 352344k buffers
Swap: 2097144k total, 208k used, 2096936k free, 2487636k cached
Why could the system be utilizing such high memory? By the way, the server is not running other processes. The samba version running in it is 3.0.33-0.17.
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Sep 12, 2011
How can i get the RAM Memory on system in terminal when i have 3 GB with an output like this:
3072
or
3145728
[code]....
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Feb 15, 2011
Ubuntu 10.10
How do I clear the System cache memory.
For the past few days , I am facing problem in opening websites (firefox & Chrome).
I have to restart the laptop and then access the web sites.
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Mar 7, 2011
Is there something similar to the windows TSR thing in Linux? (terminate & stay resident)
The reason I ask is that after replacing my HD and reinstalling Maverick I've noticed the PC freezing up afew times. It seems that memory gets used up and then doesnt free up after the application is closed. The last couple of times this happened today I was doing
1. Copying a number of photos from my flash drive to the HD
2. Burnt a disk with Brasero.
After doing this it froze and I had to crash the system and reboot. I don't remeber this happening before.
Apart from this memory problem it's working OK I think. My system specs are below
Code:
mbdb@M2000:~$ sudo lshw
m2000
description: Notebook
product: Presario M2000 (EK823EA#ABU)
vendor: Hewlett-Packard
[Code].....
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Mar 15, 2011
The more context the better. So far it does not look like it has anything to do with memory.
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Jun 13, 2011
I'm aware of Linux ECC project, but how to detect ECC errors/warnings under Linux? Do I need to load additional modules in order to get this information?
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Jul 19, 2011
In system monitor, there are numerous processes. Some such as metacity and nautilus are using 12-21 mb memory. Since my server is a 512 mb computer, which services or processes can I safely remove or end ?
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Jul 16, 2010
I have set swappiness to 0:
# sysctl vm.swappiness
vm.swappiness = 0
According to various sources, this should mean that applications have priority over file chaches, and swap should only be used when the applications themselves need more memory than is physically available. So I naively took the value free provides in the '-/+ buffers/cache' line as 'free' as the amount of memory to be available on the server. Unfortunately this is not even close to true: On a server with 20GB RAM, memory utilization by this measure never reached 50%, yet the system swaps.
I then figured out that I could use 'sync; echo 3 > /proc/sys/vm/drop_caches' to drop cached stuff. I was very surprised to still have 12.5 GB cached data after doing that. I am figuring that it's those 12.5 GB which force the system to start swapping. I also tried to use /proc/meminfo to figure out how that cached memory is used (by comparing its content before and after dropping caches). However, I don't see the correlation between the numbers provided there and what part of the cache can be dropped.
The closest match seems to be the 'Mapped' line, which was 10GB. I am pretty sure that being mmapped keeps the kernel from dropping cache. However, the value is 2.5 GB less than the cache which can't be dropped. So it is not the whole answer. What I am looking for is some way to determine how much memory the kernel could provide by dropping stuff if he needs to because of memory pressure. Is there maybe a way to simulate drop_caches without actually doing so?
The amount of potentially available memory does not have to be scientifically correct, but the number should at least be always in the right ballpark, which right now, it ain't... The point here is that it's a productive system. Sy doing stuff like dropping caches or filling memory until the system starts to swap is not a permanent solution to figure out the value. By the way, it turned out that postgres was the culprit in this concrete case, stopping it made dropping all caches possible, but that does not answer the general question of how to estimate available memory...
1. Is my assumption correct that I can subtract 'Mapped' from the freeable cache memory completely?
2. Where could the other 2.5 GB be used?
3. Is there a way to get a better guess of how much memory the system can free if necessary, before swap has to be used?
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Nov 8, 2010
I need to allocate a % of the total system memory for a buffer but what is the best method to determine how much memory is in the system? So far the only way I have found is to get the pages of memory:
Code:
long sysconf(_SC_PHYS_PAGES)
Is that the only option?
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Jan 7, 2010
I have a Red Hat 5.3 virtual machine that has 3GB memory. I just upgraded the memory to 4GB, however when I run free -m it still only recognizes 3GB. Is there something else I need to do?
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Jan 11, 2010
We have a four socket amd machine, running barcelona processors, with 64gb ram.The system runs for extended periods just fine when the system is running up to or below the 64gb memory limit. A typical load on the machine has short periods where the machine uses heavy amounts of swap space (30+ Gb). We have a swap partition of around 96Gb. When we push the machine into heavy swapping, the machine will fail within 24hrs. Has anyone experienced this problem and is there a solution other than buying more physical memory? Or am I wrong and maybe the physical memory is the issue? I thought maybe it was the memory itself, and after stripping the memory down, I get the same problem...failure upon heavy swapping
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Jan 27, 2010
openSUSE 11.2 installed on machine with 5GB memory but System Information in KDE desktop shows only 3GB total memory. Just added a further 4GB but no change shown in System Information.
Is there something I must do to have sysinfo report true value and does this mean that memory not shown is not being used?
POST BIOS check shows 9GB installed.
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Feb 1, 2010
in this example, my memory 993.4 MiB memory is said to have 575.9 MiB of it used and 163.4MiB of my 2.8 GiB swap memory used. but in my processes tab, the most memory hogging program is 98.3 MiB, and Pidgin, 25.9 MiB, and 18.9 MiB, 14.9, 6.2,6.1,5.2,3.4,3.3,1.8,1.8,1.7, etc. I'm certain these don't add up to 575.9 MiB so where is all this extra memory usage coming from?
also, why is data measured in MiB?
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Mar 6, 2010
I have a problem with recognising my mobile phone's memory card in Ubuntu 9.10. When I plug the phone in it starts the mass storage mode, but nothing happens in the PC. I suspect that I may have deleted phone's icon from the desktop, and I don't know how to bring it back. Also the memory card doesn't appear anywhere: nor in the Places tab, nor in Media folder.The phone is Samsung U900 Soul.
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Sep 1, 2010
Rhythmbox stalls my computer. I start it and within 10-20 seconds it starts to search something (i.e. in the right bottom there appears a box with a red box sliding left and right). It consumes all my memory (1 giga) and the only thing it does is identify text files in a general directory, NOT in Music. I have completely removed the install, installed it again, the same text files earlier IDed are still there? Is there an alternative?
Computer details: Intel dual core, Nvidia, 64 bit Lucid. The flaw is that it runs on single memory.
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