General :: Sort All Data In Memory?

Jun 11, 2011

For Linux command sort, how do I force sort to load all input into memory and sort assuming I have enough memory? Or is it best to use a RAMDISK to store the input before feeding it to sort?

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General :: Sort A Data According To A Given Criteria?

Dec 19, 2010

I'm struck with the following problem.
I have a data file with following data code...

(I have bigger data that needs to check all the above conditions)

get a code for the above problem
(either a shell code or a c-program)

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General :: Sort Columns Of Data (descending To Ascending)?

Mar 21, 2011

I have an ASCII file containing 3 Columns of descending data as flollows:

3277.233 | 9.032167E-16 | 5.354040E-16
3276.725 | 1.825813E-15 | 7.552098E-16
3276.211| 2.472245E-15 | 8.826818E-16
3275.699| 2.943001E-16 | 3.192112E-16


I want to sort them in ascending order.

Does anybody know how to do it in Ubuntu 10.4.

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General :: Program To View Data In Memory RAM?

Aug 5, 2011

I'm running a java program and to debug the program instead of using a debugger I would like to look to the heap and to the bytes in the memory of the process. I was hoping that the pointers would give me a snapshot of a moment of the application. It exists a program that allow us to look to the details of a process and to the memory ram?

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Fedora :: Unable To See All My Memory In F11 / Sort It?

Sep 22, 2009

Cant see all my memory in fedora 11 I think I need to update my kernel but I don't know how.

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Ubuntu :: Memory Leaking Process Causing Hang After Login / Sort It?

Jun 10, 2011

I'm still pretty new to the linux scene but kubuntu has been a great alternative to ubuntu (unity, ugh) until now.

It only started happening since i started messing around with play on linux but i dont think their related. I dont think its a driver issue either as ive switched between proprietary and default to no avail.

Basically after i log in, it takes over 3-6 minutes getting slower and slower before finally getting back to regular speed. So after a few occurences i decided that immediately after startup i went to system monitor and sure enough;

There is a process title "akonadi_contact" that is slowly growing in memory. There are also multiple occurences of it (usually between 6 and 9). they keep growing usually to the 500000k mark in memory usage before turning gray (swap storage??) and then eventualy the end.

What is "akonadi_contact"
How do i stop this from happening.
Is this a memory leak?

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Ubuntu :: Reading Data From Disk Into Memory

Jun 6, 2011

I have a simple C program that reads a 1 GB file from disk into memory.The first time I run this program, the process takes several seconds. But if I run this program again immediately after it finishes, the read happens almost instantly. What is going on here?My suspicion is that the operating system is realizing that the data I'm trying to read is still uncorrupted in memory (its been freed but not overwritten), so instead of reading it again, it just gives me the same block. I would really like to know what this process is called, or any Googleable keywords that would allow me to research it.

The reason I ask is because the size of my input data has increased. Now I need to read in a 6 GB file (my system has 12 GB of RAM), but I'm not observing the same behavior with the larger file. Each time I run the program the read takes an equally long time.

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Software :: Writing Data Into A Memory Location?

Feb 1, 2010

I am using ARM9(S3C2440) board in which linux kernel is ported and i need to write some 8-bit data(say 0xAA) into the memory location 0x08000000 and i need to trace the data written into the location is correct or not how to do this in linux.

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Programming :: Data Structure To Manage Memory?

Oct 1, 2010

I 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


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.

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Programming :: Bash Script: Sort Files Into Directory Based On Data In The File Name?

Sep 28, 2010

I have very little linux experience. And need some help with a bash script. I need to a script I can set cron to run to sort files out of a holding folder into final folders. It doesn't necessarily have to be bash, but I think it would be sufficient for this. File names are formatted as such when created: Dest-Date-Time-CID-Destination# I want the files to be moved from a all in one holding folder to a folder structure like this.


I would need an if/else if/else statement to say if Dest = A set VarX = B If for example the file name was


I would like the above file to end up moved from




So the script will need to make directories based on information in the file name which is delimited by single dashes. Then move files from the holding folder to the newly created "sorted" folders.

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Software :: Memory Card Data Recovery Program?

May 18, 2009

A friend of mine asked me to try and recover some photos she deleted by accident on her SD memory card. Normally, I would flip over to my Windows box and do this, but I'm wondering if there is a Linux equivalent to a Windows data recovery program. I'm running Fedora 10.

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Ubuntu :: Unmounting USB-drive (flash Memory) - Get Data Back?

Jan 6, 2010

I stupidly unplugget my USB-cable, which was connected to my Nokia music phone, just as if I were in Windows. What do I do? I've lost my music on the phone, or, it seems it may be there (the correct mass of data), but my phone now tells me there is no music... Can I recover this? And - what is the correct way to unplug a USB unit in Ubuntu? To make it work, and find the phone/drive - I just typed "sudo lsusb" in the terminal, and it found and opened the memory automatically... How should you unmount the USB, and maybe even how do I get my data back?

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General :: Application Virtual Address Space Memory Allocation - Memory Does Not Get Free

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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General :: Ubuntu - Memory Full, Process Memory Usage Doesn't Add Up In Top?

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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Software :: Notepad Equivalent - Transfer The Data To Windows Desktop Regularly Via Memory Stick

Sep 27, 2010

I have just started to learn Java programming and need to be able to use a compatible notepad equivalent in Ubuntu i will need to save the data as is,in Ubuntu and be able to transfer the data from my Linux machine to the windows desktop regularly via memory stick i absolutely love Linux and don't want to have to go back to windows to do this.

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General :: Memory Corruption Detected In Low Memory

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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General :: Top Used Memory Versus Ps Processes Memory

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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Server :: Memory Peak Caused Server Crash - Data Interpretation?

Dec 16, 2010

Last week my server crashed. I'm trying to diagnose the cause.

This is the relevant error message in /var/log/messages:


I'm assuming that I can conclude, then, that apache/httpd was the cause of the memory leak?

Next, I've been tracking my memory usage. Using top, this is an average memory load level for my server:


I'd like to confirm if my understanding of this data is correct, because Plesk indicates that my memory usage is only 50% or less. (Though I have read a number of reports indicating that Plesk's measurements are frequently wrong.)

Top says: Of the 2,073,156K total memory, 1,982,572K (95.63%) is being used, 90,584K (4.37%) is free. Of that sum, 421,948K (20.35%) are being used as buffers. Additionally, of the 2,096,472K of Swap, 60K is used, and 887,700K (42.34%) is cached.

My questions: Is my memory actually being 95% used? Or is the buffered quantity (20.35%) not a use of physical/virtual memory? (i.e. is it disk usage?) Does the amount of cached Swap influence the percentage of physical/virtual memory being used?

In other words, who is correct? Plesk says I'm using 40-50% of my memory, whereas top says 85-95%.

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Fedora :: "out Of Memory" Message When Plot Certain Data

Aug 5, 2011

The current Octave 3.4.0 on Fedora 15 is giving me an "out of memory" message when I plot certain data. See example below. It depends on the range, and the particular function. Anyone else get this behaviour?


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General :: Mount: /dev/mapper/gegevens-Data Already Mounted Or /data Busy

Jul 14, 2010

A few months ago I have setup a server with three hard disks. The partition mapping the disks as follows:

Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x7ca36fee


Now I have the following problem the LVM file system don't mount properly.If I open the mount point I see only a few files of the LVM disk. If I want to unmount the disk I get the following error:

umount /data/
umount: /data/: not mounted

If I want to mount the volume I get the following error:

mount -a
mount: /dev/mapper/gegevens-Data already mounted or /data busy

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Programming :: Bash Shell Scripting / Using The Sort Command To Sort The Top 5 CPU Processes?

Feb 28, 2010

What options should I use when I'm using the sort command to sort the top 5 CPU processes (ps -eo user,pid,ppid,%cpu,%mem,fname | sort ??? | head -5) showing max to min usage?

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Programming :: SORT Command Versus Unix SORT

May 4, 2010

We switched from unix to linux and we have an old report that extracted data from a database, output to an ascii file and then sorted the results in the file based on different arguments. The report now blows up when it runs,and I can only guess it is because the options for sort on linux differ slightly from unix.For example, here is one of the commands issued from within the report app that ran on the old unix box:

if sort-sequence = "descending" then
'sort -t~" -f +3.0f -4.0 +5.0r -6.0 -f '
'sort -t~" +3.0f -4.0 +1.0f -2.0 -f'

I will eventually rewrite the report to store the data in a local table, but I can simply adjust the options to suit the requirments of linux. Basically, I need to know if this can be a quick fix for the short term.

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Fedora Hardware :: Checking Computer Memory - Specification Shows 2 GB Of Memory Instead Of GB

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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Server :: Clear Cache Memory ( RHEL 5.1 ) As It Consumes Almost 100% Physical Memory?

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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Software :: Free Database That Has Low Memory Usage And Innodb And Memory Like Engin

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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Programming :: Memory Leaks - Glibc Detected - ./SuffixTree: Malloc() - Memory Corruption - 0x00

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$' and alphabets = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ$'


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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OpenSUSE Install :: Virtual Memory / Resident Memory Of Server?

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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Ubuntu :: Memory Error When Installing Python - Cannot Allocate Memory

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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Programming :: Write A Script That Can Show Me Total Memory Vs Used Memory?

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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Hardware :: Why Dmesg / Grep Memory Gives Two Different Physical Memory Amounts

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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