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• Ubuntu Boot Slow - Late Drive Access

  - by Mo2

  So I just installed Ubuntu on a brand new Samsung 840 Pro SSD and have noticed that it is slower than expected. The LED access light doesn't start blinking until after 20 seconds or so have passed, after which the boot up seems to actually start. Does anyone have any ideas as to why this is happening? I have Windows 7 installed on a separate SSD and use Windows Loader as the main loader. Windows Loader points to GRUB2, from which I then start Ubuntu up. The 20 seconds count that I mentioned earlier starts AFTER I select Ubuntu 14.04.1 from the GRUB2 menu. Any help is appreciated. EDIT: I forgot to mention that I have only one partition for / and /home. I intend on using a shared NTFS drive for my documents and other personal files, so I had no need for the /home. I did not make a /swap since I have 12 GB of RAM. I also did not make a /boot since I was told that it's not really necessary in my case.

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• Code execution time out occationally

  - by Athul k Surendran

  I am working on an e-commerce website. There is a case where I need to fetch the whole data in database through third-party API and send it to an indexing engine. This third-party API has many functions like getproducts, getproductprice, etc., and each of that functions will return the data in XML format. From there I will take charge, I will use various API calls and will handle the XML data with XSLT. And will write to a CSV file. This file will be uploaded to an Indexing engine. Right now I have details of 8000 products to feed the engine, and almost all time the this process takes about 15 min to complete, and sometimes fails. I can't find a better solution for this. I am thinking about handling the XML data in C# itself and get rid of XSLT. As I think, XSLT is far slower than C#. Is it a good Idea? Or what else I can do to solve this issue?

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• GPU Computing - # of GPUs supported

  - by TehTypoKing

  I currently have a desktop with 6 GPUs ( 3x HD 5970s ) in non-crossfire mode. Unfortunately, it seems that Windows 7 64bit only supports up to 4 GPUs. I have not been able to find a reliable source to deny or confirm this. If windows 7 has this limitation, is there a Linux flavor that supports more than 4 GPUs? In-case you are wondering, this is not for gaming but high-speed single precision computing. With this current setup ( if I can find 6gpu support ) I am looking to reach 13.8 Teraflops. Also, my motherboard does support 3 16x pci-xpress gen2 slots... and I have a 1500w powersupply plugged into a 20amp outlet. Windows is able to detect all 6 cores.. although, 2 of which displays the warning "Drivers failed to load". To recap: - Can windows support 6 GPUs? - If not, does Linux? Thank you.

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• Backing up Windows 2003 Server that has Certificate Authority

  - by Dina

  I want to export and migrate a Certificate Authority CA role from a Windows 2003 machine to a new copy of Windows 2008 R2 virtual machine. I was told that I cannot have 2 CA roles on the same network at the same time. Therefore, I must first export the certificates on the older machine, delete the CA role, then add the CA role on the new machine and import the certificates into it. As a safety precaution, I am tasked to find a backup solution in case this does not work and I need to revert back to the old Windows 2003 CA. My question is: What is the best software for doing this type of backup? I am currently trying out Symantec Backup Exec 2012. Which I hope will allow me to create a backup prior to removing CA role on Windows 2003. If this CA migration fails, the backup will allow me to revert the old machine to a time before I removed its CA role.

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• Does mdadm allow to mix sata drives and USB -> sata drives ?

  - by marc

  Welcome, I have question, i have working array md5 of 5 drives. We are running out of space. Server don't have big usage but it have to be online. We can't add another controller. I got idea to buy a USB drive case ? Does mdadm allow to mix array created on sata drives by controller and virtual usb ? (we don't boot from mdadm) But im not sure is this will work ? Is usb drives are configurated before mdadm demon start ? Regards

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• Genetic Algorithm new generation exponentially increasing

  - by Rdz

  I'm programming Genetic Algorithm in C++ and after searching all kind of ways of doing GA'a operators (selection, crossover, mutation) I came up with a doubt. Let's say I have an initial population of 500. My selection will consist in getting the top 20% of 500(based on best fitness). So I get 100 individuals to mate. When I do the crossover I'll get 2 children where both together have 50% of surviving. So far so good. I start the mutation, and everything's ok.. Now when I start choosing the Next generation, I see that I have a big number of children (in this case, 4950 if you wanna know). Now the thing is, every time I run GA, if I send all the children to the next generation, the number of individuals per generation will increase exponentially. So there must be a way of choosing the children to fulfill a new generation without getting out of this range of the initial population. What I'm asking here is if there is anyway of choosing the children to fill the new generations OR should I choose somehow (and maybe reduce) the parents to mate so I don't get so many children in the end. Thanks :)

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• How do I make a partition usable in windows 7 after power loss?

  - by user1306322

  A few days ago I was installing some software and power went down. When I rebooted, the partition to which the software was installed was not accessible. Disk manager shows that it's there, but doesn't show type, if it's healthy and gives me an error when trying to read its properties. The problem seems to be common after power loss, people recommend solving it by assigning a letter to the partition via DiskPart utility, but partition isn't listed in my case. I can access that partition with bootable OSs (like bootable Ubuntu or winXP) and all the files are there, but another installation of Windows 7 gives me the same results as the original. I could just copy all data to another disk if there was enough space, but unfortunately the size of partition I'm having problems with is 1.1TB. How do I regain access to the partition in my original Windows 7 installation without losing any data?

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• How should I track approval workflow when users at every security level can create a request?

  - by Eric Belair

  I am writing a new application that allows users to enter requests. Once a request is entered, it must follow an approval workflow to be finally approved by a user the highest security level. So, let's say a user at Security Level 1 enters a request. This request must be approved by his superior - a user at Security Level 2. Once the Security Level 2 user approves it, it must be approved by a user at Security Level 3. Once the Security Level 3 user approves it, it is considered fully approved. However, users at any of the three Security Levels can enter requests. So, if a Security Level 3 user enters a request, it is automatically considered "fully approved". And, if a Security Level 2 user enters a request, it must only be approved by a Security Level 3 user. I'm currently storing each approval status in a Database Log Table, like so: STATUS_ID (PK) REQUEST_ID STATUS STATUS_DATE -------------- ------------- ---------------- ----------------------- 1 1 USER_SUBMIT 2012-09-01 00:00:00.000 2 1 APPROVED_LEVEL2 2012-09-01 01:00:00.000 3 1 APPROVED_LEVEL3 2012-09-01 02:00:00.000 4 2 USER_SUBMIT 2012-09-01 02:30:00.000 5 2 APPROVED_LEVEL2 2012-09-01 02:45:00.000 My question is, which is a better design: Record all three statuses for every request ...or... Record only the statuses needed according to the Security Level of the user submitting the request In Case 2, the data might look like this for two requests - one submitted by Security Level 2 User and another submitted by Security Level 3 user: STATUS_ID (PK) REQUEST_ID STATUS STATUS_DATE -------------- ------------- ---------------- ----------------------- 1 3 APPROVED_LEVEL2 2012-09-01 01:00:00.000 2 3 APPROVED_LEVEL3 2012-09-01 02:00:00.000 3 4 APPROVED_LEVEL3 2012-09-01 02:00:00.000

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• unstable / variating sound level (volume) within same song / clip

  - by Bastien

  Hello, I have a pretty standard Acer desktop (I guess a predecessor of the X5900 model). when playing mp3 / radio / youtube clips, the sound level is changing WITHIN the clip, highly annoying. in the case of an mp3, the same mp3 will play at a constant sound level on my iPod, so clearly an issue with the computer. problem existed under vista, I upgraded to windows 7 and have the same issue. I guess it might be soundcard-related, so updated the drivers, no luck neither. any idea ? thanks

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• Running SQL 2008 on a VM

  - by chris.w.mclean

  We are pondering trying to set up a SQL 2008 instance inside a VM for a production environment. All our SQL instances use iSCSI over gigabit ethernet to talk to a NAS, as would this new instance. Any reason this is a bad idea or any considerations to make this work well? The VM would be running in Xen 5.5 or we could set it up in Hyper-V if there's a compelling case for that. And the VM's VHD would be stored on a different NAS then the SQL storage is on.

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• Apache Virtual Host Configuration

  - by Carl

  I have been searching the internet for an hour now, and I was hoping for a quick hint here so that I could solve my problem a wee bit faster. My virtual server is so far only accessible through an IP address, no DNS entry yet, and so far none needed either. The problem I have is with Apache2, the virtual hosts are puzzling me. What I need is: Access to my project (based on Symfony2) from the outside with the IP address Access to my project from localhost What I have got: Access from the outside results in rendering the websites in /var/www/vhosts/htdocs/default, while from the inside results in rendering the websites in /var/www. Why the difference? What is a recommended configuration for my use case?

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• page rank 0 penalty

  - by mark

  I have a wordpress blog and a www-website on the same domain for about one year. Together it is about 170 pages. The page rank is still 0. I understand that page rank 0 is a penalty for duplicate content. The pages are indexed in google but still no page rank. In google webmaster tools there is no indication for any problem. I asked for reconsideration of both blog and website a month ago. Google accepted the reconsideration but it did not change anything. Other pages of similar size and similar audience earn PR 4-6. Is there something I can do in order to get a fair page rank? A coworker told me that it might be the case that a link farm is using the content and I can do nothing about it. Is there a reliable way to check for something like that? I do not like to give up so quickly is there a chance to fix this by for example moving to another domain?

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• Issue with image lightbox and enlargement / Jquery Mobile

  - by Matt

  I'm working on a redesign of my weather website using Jquery Mobile. I have it set up so that you drill down through a series of content containers to get to the weather info (each group of info opens in a dialog display). Everything's worked well, but I've run into an issue with my images. I have them sized so that they fit a mobile device's screen nicely, but because of that, when you look at them in a desktop browser, you can't really make out what the image is. I've tried several image lightbox / enlargement solutions, but for some reason, none of them have worked. Either nothing happens or the images open in a new window. I thought that this might be caused by Jquery Mobile somehow overwriting the scripts and css of the lightbox / enlargements I've tried. I'm not completely sure though that this is the case, and if it is, how I can get around it to be able to enlarge the images to their original size, preferably onclick. Here is a working (for the most part - still some kinks to work out) example. If you look under the "Tropical" section at the "Satellite-Derived Products", you'll see what I mean. http://www.suncoaststormwatch.com/Beta/Index.html

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• How Can I Set the OS X Dock to Show Instantly Instead of Waiting Half a Second in Snow Leopard?

  - by Patrik Björklund

  Having a MacBook Pro 13" I find myself trying to maximize the screen real estate constantly which have led me to put the dock at the right hand corner of the screen. Now in an attempt to save a few more pixels I decided to give autohiding of the dock a go and ran into a problem that have plagued me all night... When you toggle the switch to automatically hide the dock you get stuck with a small delay before it appears when hovering the edge of the screen. I have learnt that this is one of the many design principles Apple have put in use. In this case it appears to be their mission to save me from seeing the dock those few times when it's not intentional to touch the screens edge. In Windows there was a way to tweak this setting to have the menubar appear instantly by altering some registry value. Is there some way I can do this in Mac OS X?

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• Compiz: How can I pin osd-lyrics to the Desktop?

  - by joebuntu

  Hey ya, I have certain applications pinned to my desktop. such as Rainlendar (1), which offers this option in the settings window conky (2), with "own_window_type normal" in my ~/.conkyrc Rhythmbox's Desktop Cover Art plugin (3), a python plugin sticked to the desktop. They all hide nicely below all other Windows. I set Compiz to not minimize them on "show desktop" command using "window rules". I also use [osd-lyrics][1] to display music lyrics. It's default behaviour is to stick always on top, which is irritating sometimes and, in my case, looks rather fugly. (4) See screenshot at: http://i.imgur.com/ie16K.jpg Now how can I tell Compiz to pin the osd-lyrics bar to the desktop below all other windows and not minimize it? I tried all sorts of window rules and exceptions, e.g. using "class=osd-lyrics", "title=osd-lyrics" but the OSD doesn't seem to match any of these. Any ideas? Running: Ubuntu 10.10 Maverick Meerkat, Compiz 0.8.6, osd-lyrics 0.3 from code.google.com/p/osd-lyrics

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• Difference in behavior of reboot

  - by LinuxPenseur

  Hi, I have 2 machines running linux. In one machine, the reboot command is an executable normally found in all linux distributions. In the second machine the reboot command is a shell script customized using some other hardware tool commands to reboot the system. One behavior difference between the 2 machines is that when i execute reboot command on the first machine, it shows another shell prompt and then only reboots. But in the case of second machine, it reboots without showing a shell prompt. I expect the second machine to behave the same way as first machine when reboot command is given. Currently i am analyzing the source code of shutdown.c and halt.c normally found in linux distributions, so that i can find out the implementation which produces the shell propmt on reboot and use that in the shell script in second machine. Kindly give me some pointers on where i should start looking to find the implementation. Thanks

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• Bios wont post unless I restart power supply.

  - by remy

  I have an annoying problem with a computer. The BIOS wont post after it has been turned off and started again unless I turn the switch off/on on the power supply. The fans, cdrom hdd and everything starts running but the bios never beeps and the monitor stays black. I HAVE TRIED: reinstalling windows xp, flashed bios to latest, cmos clear, new power supply, other hdd, new memory sticks, graphics card. I also removed the motherboard from the computer case and laid it on a cardboard box and only connected the PSU, RAM and CPU. Other than this the computer works great but its annoying having to off/on the power supply switch before turning it on after its been off. My guess is that the motherboard is faulty but I would just like to hear what you guys think. Sorry for my english / Remy

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• Most suited technology for browser games?

  - by Tingle

  I was thinking about making a 2D MMO which I would in the long run support on various plattforms like desktop, mac, browser, android and ios. The server will be c++/linux based and the first client would go in the browser. So I have done some research and found that webgl and flash 11 support hardware accelerated rendering, I saw some other things like normal HTML5 painting. So my question is, which technology should I use for such a project? My main goal would be that the users have a hassle free experience using what there hardware can give them with hardware acceleration. And the client should work on the most basic out-of-the-box pc's that any casual pc or mac user has. And another criteria would be that it should be developer friendly. I've messed with webgl abit for example and that would require writing a engine from scratch - which is acceptable but not preferred. Also, in case of non-actionscript, which kind language is most prefered in terms of speed and flexability. I'm not to fond of javascript due to the garbage collector but have learned to work around it. Thank you for you time.

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• Entity system in Lua, communication with C++ and level editor. Need advice.

  - by Notbad

  Hi!, I know this is a really difficult subject. I have been reading a lot this days about Entity systems, etc... And now I'm ready to ask some questions (if you don't mind answering them) because I'm really messed. First of all, I have a 2D basic editor written in Qt, and I'm in the process of adding entitiy edition. I want the editor to be able to receive RTTI information from entities to change properties, create some logic being able to link published events to published actions (Ex:A level activate event throws a door open action), etc... Because all of this I guess my entity system should be written in scripting, in my case Lua. In the other hand I want to use a component based design for my entities, and here starts my questions: 1) Should I define my componentes en C++? If I do this en C++ won't I loose all the RTTI information I want for my editor?. In the other hand, I use box2d for physics, if I define all my components in script won't it be a lot of work to expose third party libs to lua? 2) Where should I place the messa system for my game engine? Lua? C++?. I'm tempted to just have C++ object to behave as servers, offering services to lua business logic. Things like physics system, rendering system, input system, World class, etc... And for all the other things, lua. Creation/Composition of entities based on components, game logic, etc... Could anyone give any insight on how to accomplish this? And what aproach is better?. Thanks in advance, HexDump.

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• Good free software to track and graph memory and CPU usage on Windows?

  - by TheLQ

  There are many questions on Linux memory tracking, but I haven't seen any for Windows. In my case however its a Windows XP Pro box I need to track the memory and CPU usage of. The reason I need it is due to a server program I'm trying that is eating all my processor and some of my memory which is freezing my RDP session and System Explorer and even makes it difficult to login physically. As this is a very constrained server I'm working off of (768 MB RAM with Pentium 4 which disappears with this program), I need a program that doesn't run/require a webserver. I can give it a MySQL database if necessary however. Is there any suggestions for such a program?

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• Should all public methods in an abstract class be marked virtual?

  - by Justin Pihony

  I recently had to update an abstract base class on some OSS that I was using so that it was more testable by making them virtual (I could not use an interface as it combined two). This got me thinking whether I should mark all of the methods that I needed virtual, or if I should mark every public method/property virtual. I generally agree with Roy Osherove that every method should be made virtual, but I came across this article that got me thinking about whether this was necessary or not. I am going to limit this down to abstract classes for simplicity, however (whether all concrete public methods should be virtual is especially debatable, I am sure). I could see where you might want to allow a sub-class to use a method, but not want it overriding the implementation. However, as long as you trust that Liskov's Substitution Principle will be followed, then why would you not allow it to be overriden? By marking it abstract, you are forcing a certain override anyway, so, it seems to me that all public methods inside of an abstract class should indeed be marked virtual. However, I wanted to ask in case there was something I might not be thinking. Should all public methods within an abstract class be made virtual?

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• How to suggest changes as a recently-hired employee ?

  - by ereOn

  Hi, I was recently hired in a big company (thousands of people, to give an idea of the size). They said they hired me because of my rigor and because I was, despite my youngness (i'm 25), experienced as a C/C++ programer. Now that I'm in, I can see that the whole system is old and often uses obsolete technologies. There is no naming convention (files, functions, variables, ...), they don't use Version Control, don't use exceptions or polymorphism and it seems like almost everybody lost his passion (some of them are only 30 years old). I'd like to suggest somes changes but i don't want to be "the new guy that wants to change everything just because he doesn't want to fit in". I tried to "fit in", but actually, It takes me one week to do what I would do in one afternoon, just because of the poor tools we're forced to use. A lot my collegues never look at the new "things" and techniques that people use nowadays. It's like they just given up. The situation is really frustrating. Have you ever been in a similar situation and, if so, what advices would you give me ? Is there a subtle way of changing things without becoming the black sheep here ? Or should I just give up my passion and energy as well ? Thank you. Updates Just in case (if anyone cares): following your precious advices I was able to suggest changes and am now in charge of the team that must create and deploy Subversion :D Thanks to all of you !

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• Recursion in F#

  - by MarkPearl

  Things are slowly coming together – I was able to look at a bit of F# code and intuitively know what it was going to do (yay)… So today I saw a blog post by Bob Palmer on Fibonacci numbers in F# which inspired me to look at bit into recursion. First the C# example… class Program { public static void CountDown(int n) { switch (n) { case 0: Console.WriteLine("End of Count"); break; default: Console.WriteLine(n); CountDown(n-1); break; } } static void Main(string[] args) { CountDown(10); Console.ReadLine(); } }   In F#, the equivalent would look something like this… open System let rec CountDown n = match n with | 0 -> Console.WriteLine("End of Count"); | n -> Console.WriteLine(n); CountDown (n-1); CountDown 10 Console.ReadLine()   Pretty simple stuff. With F# you when making recursive calls you need to explicitly declare that the function is recursive with the “rec” keyword. Otherwise the code is pretty easy to read and self explanatory.

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• My game seems to be incompatible with recording software. What could be causing this?

  - by Lewis Wakeford

  I've just finished a little Game-Dev project for university and I need to record a video to accompany my submission (just in case they can't get my source to work). Basically my game doesn't work at all when FRAPS or Bandicam attempts to attach to it, I get a black screen and a stream of GL INVALID OPERATION messages from my error reporting code. Dxtory can't seem to hook into it correctly at all, it doesn't display it's FPS counter or anything. My game logic appears to be running correctly from the debug traces, it just seems like all the gl library calls break. I don't know a huge amount about how these programs operate so I don't really know what I could be doing to cause this. I've heard they read from the OpenGL frame buffers so maybe I'm doing something wrong there? I'm letting GLFW and GLEW do all the low level initialization, but I have successfully recorded projects with the same setup and recording software. Essentially, has anyone ever run into something like this before or do you know anything about how these programs work that could give a clue as to the cause of the issue?

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• How to access a site in IIS with no DNS mapping

  - by CiccioMiami

  In my IIS 7.5 hosted in a Windows Server 2008 R2 I have several websites with no DNS address assigned. Let's take for instance the site (as named in IIS) with site name mySite. I have for this site the standard binding with no host name. Suppose that my server IP address is, for instance, 101.22.23.01. Therefore it seems logic to me that in order to access the website, I should place in the address bar of my browser: [IP_address]/[sitename] in this case: 101.22.23.01/mySite but it does not work. Shall I specify something else in the bindings?

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