General :: Memory Figures Add Up In Top?
Feb 11, 2010
I'm a bit confused on how the memory figures add up in top. If I've understood correctly, the amount of "really" used memory is total - free - buffers - cached. In the example below that would be 14370248k - 75736k - 178892k - 10459552k = 3656068k, which is 25% of the total memory (3656068/14370248). Again, if I've understood correctly, the numbers shown in RES and %MEM columns show the amount of physical memory a process "really" uses. The sum of the RES values of just httpd processes is 7254m, or 7428096k (7254*1024), which is 52% of the total memory (7428096/14370248). The sum of %MEM values of httpd processes is 53%, close enough. How come the summary part shows just 25% of memory being used, while httpd processes alone claim to use over 50% of memory? What am I missing here?
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Mar 25, 2010
I have made some plots in gnuplot that I wanted to include in a document. I have tried both OpenOffice and Kile.
In openoffice the plots are shown when they are imported, but when I save the document and open it up again the plots are gone (unable to read).
In Kile I can't even import them, It cant find the file in the folder. I tried changing the formats from jpg to png - didn't work. Tried just taking a snapshot of the original plot and saving it, didn't work either (but have used the same method earlier today without problems for a different image).
When i move the cursor across the file, it fades away as if it's not registered correctly. Does anybody have a solution for this?
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Oct 5, 2009
I am creating a document using Latex and I am using the existing article class "documentclass[twocolumn]{article}" The paper needs to have a two column format, but I have figures that I would like to include in a landscape orientation, possibly on a new page, (they appear too small even if I have them span either 1 or both columns).
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Apr 20, 2010
I am using malloc and frees a lot in my program. It shows its allocated but when i remove it doesnt show as the memory is removed(I am using the top command to view VIRT memory usage). If this continously grows what would happen to my program (Will it go out of memory?)
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Mar 18, 2011
I have a computer with 16GB of ram. At the moment, top shows all the RAM is taken, (NOT by cache), but the RAM used by the various processes is very far from 16GB.I have seen this problem several times, but I don't understand what is happening.My only remedy so far has been to reboot the machine.
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Aug 22, 2010
This is my first post in these forums. I'm still quite new to Linux (using Mint 9) so please bear with my not-very-articulate question(s)When I boot up and open up a tty terminal I get a message saying "Memory corruption detected in low memory." I've done an extensive google search about the issue and it seems not uncommon. I ran a memtest with no errors returned, so I'm sure that there's nothing really wrong with the memory; apparently it's a bug in the kernel that's causing this.
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Jan 17, 2010
I found from command 'top' that 8GB memory are used. However, using command 'ps' with some options to grep the running processes and then summing up the memory used by the running processes are less than 2 GB. Where has the used memory gone ?
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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:
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Jan 11, 2010
let me know how to clear cache memory ( RHEL 5.1 ) as it consumes almost 100% physical memory.
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May 3, 2011
I am looking for free database that has low memory usage and innodb and memory like engins that has C API and support trigger and client/server support for using in embedded linux systems.
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Mar 21, 2011
I am new to C and linux. My code below does arbitary writes but I cant figure out where or how it does it.
I am calling the insertNode() function with seq = 'MISSISSPPI$' and alphabets = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ$'
Code:
Weird behaviour I should mention is that when I check for NULL pointer in node->child[index], the unassigned values are not null anymore, they point to arbitary memory.
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Feb 3, 2010
we found that if we use 'top' to show the memory usage of a server (SuSe Linux 10), we can get virtual memory usage as well as 'Resident memory' usage. For virtual mem or a particular process, it is around 1.1GB, which is large but for resident memory, it only consumes 300MB. Are there anyone who knows what the differences are? I would also like to know whether the difference (1.1GB - 300MB) = 800MB are actually available for use by other applications in the system.
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Apr 19, 2010
I get this error when I run "sudo apt-get install python-software-properties"
Preconfiguring packages ...
dpkg: unrecoverable fatal error, aborting:
fork failed: Cannot allocate memory
E: Sub-process /usr/bin/dpkg returned an error code (2)
I'm trying to install deluge via ssh and my vps has 512mb ram and is only using 11% of it prior to running the code.
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Apr 13, 2010
How do I write a script for my Linux that can show me total memory vs used memory and have it email me results if it's over 70 percent?
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Oct 20, 2010
I 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?
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Jan 29, 2011
I have had a fresh install of Ubuntu 9.10 and installed some software after that.Since third some, some process is eating half of my memory.I have checked processes running in system manager but everything is normal.Maximum is consumed by compiz which is about 26 mb, seems very normal.I did restarted my computer several times, and in the start for 5 mins, its fine after that again my cpu fans runs at very fast speed and my one cpu is used up 95 % (I have dual core).Please help me out, this invisible thing is driving me crazy.I am attaching my htop screen shot (sorted by cpu %), now the cpu is not used by completely but fan is still struggling hard and fast.
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Nov 22, 2009
I am writing an application that wants to access periphals registers outside the standard (allowed) memory area.
Doing so gets me "segmentation fault".
I know, this is natural behaviour.
One way of getting around this is writing the module which has to be loaded by linux. I will consider this some time later.
For now, I want to come to some quick result and allow linux or gcc compiler to write to those memory areas of periphals. Is there a direct way to do so?
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Aug 25, 2010
Is that possible that SHM shared memory is counted as cache memory on Linux with kernel 2.6.18?If find it really odd since this memory is not file backed, but I have a piece of code that loads data using shm_open+mmap, and it generates an amount of cache memory in /proc/meminfo that corresponds exactly to the amount of shared memory (I load that data from a file but I am using posix_fadvise(fd,0,0,POSIX_FADV_DONTNEED) to ensure this file is not cached and I made sure that it is working as expected). As far as I know SHM memory was not tagged as cache memory with kernel 2.6.9.If it is the case it is really unfortunate since normally cache memory can be considered to be part of the "available" memory since it can be flushed promptly but this is clearly not the case with SHM memory... Is there an easy way to get the total amount of used SHM memory on a system?
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Jan 8, 2011
I have been setting up a vps I got out with bhost.net, with CentOS installed. I've been learning and have set up everying I need with the exception of ftp/sftp.
Using yum I installed vsftpd and ran into problems, thinking it was something I might of done I did a fresh install of CentOS and I still recieve the same problem on a fresh install so it is nothing I have done to the server.
The problem is when connecting via a sftp client I get an out of memory error. This error is listed in the putty faq ( url ) under A.7.5, there is a brief explaintion of the cure under A.7.6.
there is mention of a login script but I don't know where this is located. I'm a novice at Linux but by no means incompotent when it comes to computing.
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Sep 22, 2010
Fairly new to Linux, using Red Hat ES 5.5 with 16GB of memory.Looking at migrating the server to a VMWare VM, but I need to figure out how much of the 16GB I am actually using.What are some ways to tell the true amount that I need.I know that Red Hat allocates most of the memory just so it is ready to be used, so that throws me off a bit.
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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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May 4, 2011
I'm running a quite complex model, and it's taking me around a week to complete the run, and one of my colleagues says that he can run it in one-two days. After looking to several forums to know how does it work, I've seen how the memory is used (using the command ps -A --sort -rss -o comm,pme), and the model run just takes 0,3% of the memory. I bought a 4 cores and 8gb of RAM laptop to be able to run the model fast, but I don't know how to allocate the use of the memory to concentrate it in developing that task. Is that possible?
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Mar 26, 2010
I am using a machine I SSH into to do some processing over very large files, but I am now unable to access it through ssh.The shell I had opened is not responsive, and when I try to connect again, it hangs even before asking for the password.I suspect this to be a memory problem as a couple of processes need to load a lot of the data to process it.Is there an emergency way of going back into this machine, or killing some processes to free the memory up ? I tried ssh ... 'kill -9 pid' but it is not even able to do this.Do you reckon the processing is still happening or is the machine completely idle ? How would you advise me to go back to it ? It's for my final year project, and I'm starting to stress !
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Jul 11, 2010
how do i use a memory stick
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Feb 20, 2010
I am getting "out of memory" error when i am trying to format 8GB pen drive in ntfs format .So, i added two swap partition 64MB (as my device has 32MB RAM)to increase mem.but swap space used is max 1000Kb.
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Aug 5, 2009
I would not exactly consider myself a newbie but this is a bit of a newbie question so here it goes.
When I run top I see used memory and free memory. When I first boot the system there is lots of free memory in about a day or two that memory whittles down from 2GB of Free mem(of 4GB) to 20MB and then maintains 20-50MB of free memory. This seems to be consistent across different servers. At first I thought there had to be some major memory leaks but it just seemed to prevalent to not have been noticed before.
I found a better way to gauge memory usage is the use of the free command. Now I am confused though, what is Free memory as it is defined and monitored in top?
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May 9, 2010
I have a moderately old laptop, with an AMD Turion 64 X2 TL-50 processor and 438 MB RAM (after the graphics takes a fair old chunk it seems). I've currently got lubuntu 64-bit on it, and am not 100% happy with the performance. (Though I'm very pleased with the system in other respects). I'm wondering whether 32-bit GNU/Linux might use less RAM, and thus result in better performance.Or should I be more focussed on other things if I'm looking to boost performance, like maybe the hard drive, or stopping the CPU throttling down (/proc/cpuinfo reports 800MHz)?
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May 4, 2010
I have a query regarding top & virtual memory. When we run top it show VIRT (Virtual Mem), RES (Resident Mem) & SHR (Shared Memory). The total virtual memory of my machine is 4 GBs (2 GB RAM + 2 GB Swap), but still I am able to see a process showing 4000m virtual memory column. what it means, as its show VIRT Mem more than actual available VIRT memory
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Nov 18, 2009
I am having a Oracle server installed on Linux server. I want to clear the buffers after a certain time interval. I use the following command for the same.
echo 3 > /proc/sys/vm/drop_caches
Can I have a script which will execute the above script after certain time interval OR a script which will execute the above command when certain memory size is reached.
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Feb 23, 2011
There are plenty of tools for umounting/mounting/automounting usb flash/pen drives/dongles/hard drives. There's the Device Notifier on kde 4, for example.
But what about other devices like headphones, mice, keyboards, modems, etc? A tool for doing this would be very handy.
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