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• EC2 Image to start

  - by HD.

  I'm starting to test EC2 for a couple of new projects. I need to choose an AMI (Amazon Machine Image) and Amazon offered me as first option Fedora Core 8, which is a very old version of one of my favorites distributions. There is a lot of choices, but it's not clear for me which one is the better option. I have my own reasons in order to choice a distro and a version when I need to install a new server but I don't know If I can apply the same for EC2. I know there is a beta for RHEL, how stable is this beta?, How can I choose between all the CentOS AMIs in the list? So this is my question: Do you recommend an AMI to start with EC2? Thanks

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• Copying large file from SD to HDD via USB failing on Ubuntu

  - by Kent Boogaart

  Hi, I'm attempting to copy some large files from my camera (Canon EOS 500D) to my laptop, which is running 64 bit Ubuntu 9.04. I am using USB to connect the two devices. For most files, it is simply a matter of control-C and control-V. I have done this successfully many times with both photos and small movies (eg. 180MB). However, when I attempt to do this with very large files (eg. 3GB), the copy seems to start with a lot of activity both on the camera and laptop, but after 10 minutes or so the camera is automatically unmounted and the copy fails to complete. I have read that this might be due to the device not mounting as a mass storage device, but I cannot see any obvious way for me to change this behavior. Can anyone offer any direction here? I'll get a USB card reader if necessary, but I'd prefer to be able to just plug my camera in. Thanks

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• How you choose your first job as a programmer? [on hold]

  - by sliter

  For Brief I am a recently graduated CS student. I am looking for a job these days, but I have no idea what kind of software development jobs I like(embedded system,web development or else...). And I am looking for your advice. Here is a little more While I was a student, I had an one year internship experience as a system engineer in a semi-conductor company where I wrote Linux driver, tuned system performance, etc.. I was happy about this experience as it allowed me to deepen my understanding of the operating system and different low level things. And I thought "Em, I will continue in the embedded area after I graduate". At the end of my study, I am doing an another internship in web development, both front-end and back-end. And I also enjoys a lot the process of learning new things and making it work (Backbone, Node, socketio, etc..). Now, when I am looking for a software development position, I do not know what to apply! All I know is that I want a job which allows me to keep up with the trends instead of repeating. But besides this, I've no idea what specific type of job I want to do. Turn back to embedded system? Continue with web development? Change to other promising areas(data mining)? All these development positions makes no big difference to me. But I think this is not good and I need some criteria at choosing. So I am looking for advice and I would really appreciate if you can share your experience.

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• Good resources for learning modern OpenGL (3.0 or later)?

  - by MatterGoal

  I stumble upon the search of a good resource to start with OpenGL (3.0 or later) . Well, I found a lot of books but none of them can be considered a good resource! Here two examples: OpenGL Programming Guide (7th edition) http://www.amazon.com/exec/obidos/ASIN/0321552628/khongrou-20 This is FULL of deprecated material! Almost every chapters begin with a note about that. OpenGL Superbible (5th Edition) http://www.amazon.com/exec/obidos/ASIN/0321712617/khongrou-20 This book uses a library created by the author to explain the main arguments, hiding what you want to learn! I don't want to learn how to use your library! I want to learn OpenGL! I hope that you understand this is not the same question like "hey I'm not able to use Google... tell me how to learn OpenGL". I've just finished a full and deep search but I can't find a good and complete resource to learn the "new" OpenGL avoiding deprecated topics. Can someone heading me in the right direction? I know C++ and I have 10 years of experience in development... where I can find a good resource?! I want to spend time on it and I want to learn deeply. (please feel free to edit my question, my English is terrible!)

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• Why do I have inconsistent network issues with my laptop's wireless?

  - by Jason

  I'm having trouble with my laptop Internet connection. It's patchy at best and resets or freezes a lot. The signal strength is also random. I thought it might be a driver issue but now I don't know. Three other computers using the same wireless network run well. I've switched out wireless routers so I don't think it's the router. I thought it might be the laptop's internal wireless card but I just bought an external USB network card and I'm still having problems. Specs Lenovo T-60p Windows 7 Ultimate Edition Patches/drivers are up to date I only use one of the below at a time, disabling the other: Intel PRO/Wireless 3945ABG v. 13.3.0.137 (Internal wireless) Medialink Wireless-N USB 2.0 Adapter (USB wireless) Any ideas on what might be the problem?

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• Squid gives always tcp_miss reverse proxy

  - by JaakL

  I added installed latest squid3 in front of apache as reverse proxy. The problem is that it gives always tcp_miss, in fact I have not yet found a single TCP_HIT message in the log file, and most of the content is static. Relevant config values for cache_dir and refresh_pattern are default ones, directory /var/spool/squid3 exists and has some files/folders. I have 100+G free storage, but reconfigure gives warning "WARNING cache_mem is larger than total disk cache space!", which does not make any sense to me. I have googled a lot and seen with similar problems, but none of them has helped.

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• Thunderbird very slow with Gmail

  - by koskoz

  I'm using the latest version of Thunderbird with 3 Gmail accounts. Every time I launch it it seems it's downloading all my messages again. I've compacted folders (is the action working for the 3 accounts or do I need to do it for each of them?) and deleted the .msc files but nothing change. It leads to a software using a lot of bandwidth and being very slow when using it. It's a pain to write a message or even to view one. All the software is so slow I've never seen that it's almost unusable. I'm using thses addons : Dictionary Google Calendar Lightning My Gmail accounts are configured to imap.

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• ViewSonic LCD Monitor Touch-input

  - by Synetech inc.

  I bought a used 15" ViewSonic LCD monitor (VP150m) and noticed that it has a 3.5mm connector on the back labeled “touch i/o”. I’m trying to figure out how to use the touch function but am having trouble finding anything useful. First, I cannot find any information on what kind of cable it uses (TS, TRS, TRRS, etc.), or how to connect it to the computer. Second, I cannot find touch drivers for it—though I can find a page that mentions how easy it is to install them. Does anyone have any information on using the touchscreen function of the VP150m? Thanks a lot.

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• Windows W8, L8 and now H8

  - by raccoon_tim

  Windows 8 is having to endure with a lot of headwind at the moment. The weather forecast doesn’t appear to improve in the near future either with prominent game developers and publishers taking to the barricades accusing Microsoft of building a closed ecosystem. I am forced to side with this opinion as I too see services the likes of Steam as playing an important role in the gaming world, which just happens to be an industry that cannot be sidelined. What Microsoft is attempting to do is merge the PC and mobile markets. The Windows Marketplace is to be the only place where you can purchase Windows applications in the future starting now with Metro apps. This is what Apple, Google and Microsoft have been doing with mobile devices for some time now and it’s what we have all come to expect. The PC market is different, however. It has always been open, which has resulted in a diverse market allowing for third parties to build successful distribution and marketing networks. You could argue that Microsoft is just doing something that Steam has been doing for a long time now but the difference is that Microsoft would own both the marketplace AND that operating system, which would eventually give it dominance over the whole Windows application distribution network. Currently there is no real alternative to Windows in the PC gaming world but I would expect to see Mac OS and Linux getting more popular if Microsoft does not notice the signals coming from the gaming industry and choose to once again open up the markets on the PC.

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• Finding which tiles are intersected by a line, without looping through all of them or skipping any

  - by JustSuds

  I've been staring at this problem for a few days now. I rigged up this graphic to help me visualise the issue: http://i.stack.imgur.com/HxyP9.png (from the graph, we know that the line intersects [1, 1], [1, 2], [2, 2], [2, 3], ending in [3,3]) I want to step along the line to each grid space and check to see if the material of the grid space is solid. I feel like I already know the math involved, but I haven't been able to string it together yet. I'm using this to test line of sight and eliminate nodes after a path is found via my pathfinding algorithms - my agents cant see through a solid block, therefore they cant move through one, therefore the node is not eliminated from the path because it is required to navigate a corner. So, I need an algorithm that will step along the line to each grid space that it intersects. Any ideas? I've taken a look at a lot of common algorithms, like Bresenham's, and one that steps at predefined intervals along the line (unfortunately, this method skips tiles if they're intersecting with a smaller wedge than the step size). I'm populating my whiteboard now with a mass of floor() and ceil() functions - but its getting overly complicated and I'm afraid it might cause a slowdown.

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• Windows 7 system CPU bogged by windows services, no explanation

  - by Alex

  I'm looking at a laptop for a colleague which is running terribly slow. A quick look showed that the CPU was 100% used by 2-3 SVCHost processes, which off course doesn't tell much since those are just 'cover' processes with services running underneath them. So I fired up process explorer in hopes of finding a shady rogue service which was bogging the system, but to my suprise I found genuine MS Windows processes (or at least damn-good disguised ones) are bogging down the system: dnscache (DNS Client) IKEEXT (IKE and AuthIP IPSec Keyring modules) iphlpsvc (IP Helper) Seen separately, these processes might seem odd to be using a lot of CPU, but taking a step back one can conclude that all three services are quite closely related to networking. I've tried running: netsh int ip reset log.txt which has helped me save bizarre network-related problems in the past, but this didn't help Off course I though about a virus, but both MS Security Essentials as well as malwarebytes (let both run a full scan).

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• How to record audio in Windows Server 2008 Web SP2?

  - by Aurelio De Rosa

  I face into this problem and before ask here I've searched and read a lot of question but no-one seems to fit to my problem. I have a server running Windows Server 2008 Web with the SP2 and a headset attached to it using audio jack. The server has audio driver since I can listen audio. This OS does not came with the built-in audio record tool (the one I have in Windows 7). I can access physically and remotely (using RDC) to this server with administration permission. My local pc has Windows 7 if it can help. All I want to do is to know if it's possible and how to record audio form the microphone (of the server) and store that file in the server from remote connection. I tried to install several software on the server but everyone fails with a different issues (missing DLL which if I put in the system the error doesn't go away).

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• Best ways to move a server room and 80 desktops to a new building

  - by Marko

  Need to plan the best way to physically move a server room (12 IBM x3400 towers) and all associated networking equipment to a new building. Everything is going, comms (80 strong call centre operation), desktops(80-90) the whole lot and has to be done efficiently over a weekend. What I cant seem to find are the best ways to move equipment, i.e is it best to remove hard drives and pack them separetely, do I pack the chassis' with foam and/or surround them in bubble wrap? Are there specific products designed to move computer equipment and where would I find these. The internet has failed me so far, please help

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• VGA passthrough and desktop virtualization

  - by Zacariaz

  In short, my dream is to have one machine with multiple paravirtualized desktop and server guests, one of which has to be a Windows desktop with powerful graphics. As Windows can't be paravirtualized in the normal sense of the word, I was quite happy when I heard about VGA passthrough, but then I read on. As I understand it, such a setup would mean that the Graphics will be dedicated to one particular guest, thus you wouldn't be able to switch between guests. If this is in fact so, would someone please explain to me what the purpose/use of VGA passthrough is? I can think of no real use for it. Yes it's a cool technology, but to me it seems pointless. It's true that it's possible to passthrough individual VMs to separate GPUs, which is also cool, but in the end I should think that two seperate computers would make life a whole lot simpler. Again it seems rather pointless.

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• What is the best way to store a table in C++

  - by Topo

  I'm programming a decision tree in C++ using a slightly modified version of the C4.5 algorithm. Each node represents an attribute or a column of your data set and it has a children per possible value of the attribute. My problem is how to store the training data set having in mind that I have to use a subset for each node so I need a quick way to only select a subset of rows and columns. The main goal is to do it in the most memory and time efficient possible (in that order of priority). The best way I have thought of is to have an array of arrays (or std::vector), or something like that, and for each node have a list (array, vector, etc) or something with the column,line(probably a tuple) pairs that are valid for that node. I now there should be a better way to do this, any suggestions? UPDATE: What I need is something like this: In the beginning I have this data: Paris 4 5.0 True New York 7 1.3 True Tokio 2 9.1 False Paris 9 6.8 True Tokio 0 8.4 False But for the second node I just need this data: Paris 4 5.0 New York 7 1.3 Paris 9 6.8 And for the third node: Tokio 2 9.1 Tokio 0 8.4 But with a table of millions of records with up to hundreds of columns. What I have in mind is keep all the data in a matrix, and then for each node keep the info of the current columns and rows. Something like this: Paris 4 5.0 True New York 7 1.3 True Tokio 2 9.1 False Paris 9 6.8 True Tokio 0 8.4 False Node 2: columns = [0,1,2] rows = [0,1,3] Node 3: columns = [0,1,2] rows = [2,4] This way on the worst case scenario I just have to waste size_of(int) * (number_of_columns + number_of_rows) * node That is a lot less than having an independent data matrix for each node.

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• Is there a "pattern" or a group that defines *rcs files in *nix environments?

  - by Somebody still uses you MS-DOS

  I'm starting to use command line a little more, and I see there are a lot of ways to configure some config files in my $HOME. This is good, since you can customize it the way you really like. Unfortunately, for begginners, having too many options is a little confusing. For example, I created .bash_alias for some alias I'm using. I didn't even know this option existed, I'm used to simply edit .bashrc. Do exist a pattern, a "good practice", envisioning flexibility and modularity in terms of rc files structure? Do exist a standardization group for this, or every body just creates it's own configuration setup?

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• can't enable share on clients in my network

  - by nahman

  i installed on my subnet a win 2003 server as the domain controller, with dhcp and dns options too. the clients, win xp pro and and win 2003 server. in my clients when i log in via the domain, i don't have the option to share folders in the netwrok! i want to share folders this way: right lcick on the fodler Properties Sharing Share how can i make it appear? (if i log in to the computer as the administrator i do have this option) p.s. please be specific for how to enable it, thanks a lot :) nahman.

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• OS Isolation: Virtualization or Dual-Boot Duplication, a General How To?

  - by Mr_CryptoPrime

  I want to isolate my windows 7 operating system and I have looked into virtualization. This should work with Linux, however, I do want to still have a way to run windows 7 securely, but without significant performance loss, thus eliminating virtualization for that. I know that you can dual boot because I currently do so with my XP/Linux system. Is there a way that I can duplicate my windows 7 system so I can select one at bootup? This way I can ensure that each OS is isolated and not worry about performance loss. However, I am having a lot of trouble finding a solid method for OS duplication?! Is this even possible or must I buy two versions of win7 and somehow install them separately? Any information regarding this would be helpful, thanks! Essentially I want, Two instances of win7 (not necessarily simultaneously running) Each are isolated from one another so that a security breach in one doesn't affect the other. There is no performance loss in either from doing so

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• Utility to record IO statistics (random/sequential, block sizes, read/write ratio) in Unix

  - by Michael Pearson

  As part of provisioning our new server (see other SF) I'd like to find out the following: ratio of random to sequential reads & writes amount of data read & written at a time (pref in histogram form) I can already figure out our reads/writes on a per-operation and overall data level using iostat & dstat, but I'd like to know more. For example, I'd like to know that we're mostly random 16kb reads, or a lot of sequential 64kb reads with random writes. We're (currently) on an Ubuntu 10.04 VM. Is there a utility that I can run that will record and present this information for me?

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• cannot log in to all account except guest after mounting new partition

  - by student

  I really really need help. to do my homework from school, since two days ago, I was installing oracle 11g on my ubuntu. through that process, there was lots of problems also, but searching a lot, in somehow I could go to the next phase installing it. (because it was the first time to install on ubuntu by myself..) but when I was making password for oracle and clicked next, it says there are not enough space for home/oracle folder, So to make another space, I mounted another space after checking Gparted and using Software device management, I mounted it. And when I rebooted it, since then, I cannot log in to my own administrator account and even to oracle account(that I made for oracle 11g on ubuntu ) when I type the passwords for it, it seems to work but it redisplay the first page to log in, without really logging in it.. So I loggined to here as guest account... and even I cannot try gnome console manipulation to restore or fix it.. because it is guest account... I`m struggling for three days and... help me, how do I need to do? and at the time oracle said it needs enough space for its home folder, how I should have done?

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• Dual boot :Windows 7 partition deleted after Kubuntu 14.04 install...Weird!

  - by user292152

  I've bought two new SSD's in order to install Kubuntu on one and Win 7 on the other one. Before I had Linux Mint and Win7 together one just one SSD. So first I installed win7 as recommended, and then used the guided installer of Kubuntu to install Kubuntu. I selected the second SSD, chose the option "use entire disk and install", but to my surprise after rebooting and selecting win7 boot loader from grub2, I got a prompt that my windows installation is damaged, and I need to run the repair option from the installation disk. So I booted into Kubuntu again, fired up kparted and saw that indeed my windows partition got deleted, except the recovery partition. I don't understand what happened. I am not new to this topic, and this was not my first time installing Ubuntu alongside windows. I have never ever had that problem. What can I do to make sure this won't happen again, so I won't waste another 2 hours of my life? ?? Thanks a lot !

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• Is there any script to do accounting for the proftpd's xferlog?

  - by Aseques

  I would like to convert from the xferlog format that proftpd uses into per user in/out bytes, to have a summary on how much traffic does each user use per month. The exact format is this: Thu Oct 17 12:47:05 2013 1 123.123.123.123 74852 /home/vftp/doc1.txt b _ i r user ftp 0 * c Thu Oct 17 12:47:06 2013 2 123.123.123.123 86321 /home/vftp/doc2.txt b _ i r user ftp 0 * c So far I only found a script that makes a nice report but not exactly what I needed, that one can be found here I might create a fork of this one and place it somewhere but it probably has been done a lot of times already. Just found a well hidden page in proftpd site with some more examples here

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• Software Architecture: How to divide work to a network of computers?

  - by Morpork

  Imagine a scenario as follows: Lets say you have a central computer which generates a lot of data. This data must go through some processing, which unfortunately takes longer than to generate. In order for the processing to catch up with real time, we plug in more slave computers. Further, we must take into account the possibility of slaves dropping out of the network mid-job as well as additional slaves being added. The central computer should ensure that all jobs are finished to its satisfaction, and that jobs dropped by a slave are retasked to another. The main question is: What approach should I use to achieve this? But perhaps the following would help me arrive at an answer: Is there a name or design pattern to what I am trying to do? What domain of knowledge do I need to achieve the goal of getting these computers to talk to each other? (eg. will a database, which I have some knowledge of, be enough or will this involve sockets, which I have yet to have knowledge of?) Are there any examples of such a system? The main question is a bit general so it would be good to have a starting point/reference point. Note I am assuming constraints of c++ and windows so solutions pointing in that direction would be appreciated.

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• Ultrabooks and projectors: is there any connectivity issue due to low power on video output? [closed]

  - by sergey

  I need to buy a new laptop for my wife. She travels a lot and I was thinking about an ultrabook (1.5-2 kg). However she says that ultrabooks have problems connecting to projectors. At least some of her colleagues could not connect their ultrabooks to projectors due to “low output issues”. She is in-company consultant and trainer and for her “be able to connect to any client projector” requirement is must. Thus my doubts are: Is this problem well known? Is there any chance to assure connectivity to projector (by checking some specification before buy, etc)?

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• Most effective way to change Linux command prompt for all users?

  - by incredimike

  I have several machines and the hostnames are really long.. i.e. companyname-ux-staging-web1.companyname.com. So my prompt looks something like [root@mycompany-ux-staging-web1 ~]# I'd like to shorten that up for all users on all machines with the least amount of work. From what I read I have a couple options, but they all have their drawbacks. I could change the hostname, but that would likely affect applications. Not a great choice. I could alter also $PS1 at login for all users by editing all .bashrc for existing users, and edit /etc/skel/.bashrc for potential new users. That's a lot of work across 10 machines. What's my best option or what have I overlooked?

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