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  • Minimizing Java Thread Context Switching Overhead

    - by binil
    I have a Java application running on Sun 1.6 32-bit VM/Solaris 10 (x86)/Nahelem 8-core(2 threads per core). A specific usecase in the application is to respond to some external message. In my performance test environment, when I prepare and send the response in the same thread that receives the external input, I get about 50 us advantage than when I hand off the message to a separate thread to send the response. I use a ThreadPoolExecutor with a SynchronousQueue to do the handoff. In your experience what is the acceptable delay between scheduling a task to a thread pool and it getting picked up for execution? What ideas had worked for you in the past to try improve this?

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  • Help deciding on an area of study for a PhD [closed]

    - by ale
    I am going to start a PhD in about 1 year. My undergraduate degree is in computer science and my master's is in artificial intelligence. I want to get ideas about what's going to be hot in say 5 years i.e. what could I spend 3-4 years studying to potentially have expertise that will be applicable to industry and the computing world ? Impossible to answer factually but some ideas and thoughts would be great. I have narrowed my ideas down to AI (yes, even more AI) and information security. AI seems to becoming popular again but security is always a going to be useful. From a career point of view, if I were to stay working in software development then this might actually be the best move but I've always wanted to do a PhD! Many thanks :).

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  • Help reinstalling Ubuntu on macbook pro

    - by pipsqueaker117
    Ok. I recently installed ubuntu on my macbook pro. Unfortunately, while trying to install the nvidia graphics drivers the system wouldn't reboot, the screen grey for hours. I concluded that I had broken ubuntu, and proceeded to boot into osx and remove the ubuntu partitions. After I had done that, after a reboot, I noticed that "boot linux from hd" was still listed in the bootloader (i'm using rEFIT). I dismissed it. Now, I'm trying to reinstall ubuntu, using the same USB that I successfully installed with earlier. Now, however, when the ubuntu installer is on the "copying files" part this error (more or less) pops up. ERRNO 5: We're sorry, the installer crashed. This error frequently is caused by faulty installation media, the hard disk being too hot... and so on and so forth. I'm not sure what's causing the problem, but I have a hunch that whatever's the reason that's causing linux to show up in rEFIT is the root reason. If anyone could respond, that would be great. PS, and unfortunately no, i do not have a time machine backup.

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  • help me with my wine, it doesn't work properly

    - by Sebastian Raun Mikkelsen
    When I try to run something with wine, nothing happens! I have many had problems with Ubuntu so I have tried to get Windows 8 back on the computer, but because Ubuntu can't run exe files I can't open the installer. Furthermore my computer can't boot from a CD/DVD anymore after I installed Ubuntu, it turns up with a black screen with a blinking marker at the upper left corner of the screen and after 10 minutes it says something like Can't boot from the selected media device - select another How do I get Windows back?

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  • HELP! Problem Can't do anyting on ubuntu 13.10

    - by Perbasilopou
    I upgraded from ubuntu 13.04 to 13.10 but when i open my laptop it freezes before i can login ant the gnome 3 splash screen. alt ctrl + f(any) not working. the only thing i can do is manualy power off. I tryied everything on recovery mode screen and some stuff about grub (nomodeset quiet splash stuff i found at this forum) but nothing is working. I can't reach tty's to login so i can't reinstall drivers for my ati radeon mobility hd 5xxx. that is my secs http://www.sony.co.uk/support/en/product/VPCEB2E1E_WI/specifications .

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  • Bitmap & Object Collision Help

    - by MarkEz
    Is it possible to detect when an object and a bitmap collide. I have an arraylist of sprites that I am shooting with an image. I tried using this method here but as soon as the bitmap appears the sprite disappears, this is in the Sprite class: public boolean isCollision(Bitmap other) { // TODO Auto-generated method stub if(other.getWidth() > x && other.getWidth() < x + width && >other.getHeight() > y && other.getHeight() < y + height); return true; }

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  • JAVA: Can't get context parameters in Filter

    - by DaTval
    Hello, I have a filter and parameters in web.xml web.xml is like this: <filter> <description> </description> <display-name>AllClassFilter</display-name> <filter-name>AllClassFilter</filter-name> <filter-class>com.datval.homework.AllClassFilter</filter-class> <init-param> <param-name>DB_URL</param-name> <param-value>jdbc:derby:C:/Users/admin/workspace/homework03/homework/databases/StudentsDB;create=true</param-value> </init-param> <init-param> <param-name>DB_DIALECT</param-name> <param-value>org.hibernate.dialect.DerbyDialect</param-value> </init-param> <init-param> <param-name>DB_DRIVER</param-name> <param-value>org.apache.derby.jdbc.EmbeddedDriver</param-value> </init-param> </filter> mapping is working well. But I can't get this parameters in my filter. public void init(FilterConfig config) throws ServletException { // TODO Auto-generated method stub debugMessage = config.getInitParameter("debugMessage"); ctx = config.getServletContext(); } public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { // TODO Auto-generated method stub // place your code here ctx.log("Start - " + debugMessage); String myDbUrl = ctx.getInitParameter("DB_URL"); String DB_DIALECT = ctx.getInitParameter("DB_DIALECT"); String DB_DRIVER = ctx.getInitParameter("DB_DRIVER"); Map<String,String> pr = new HashMap<String,String>(); pr.put("hibernate.connection.url", myDbUrl); pr.put("hibernate.dialect", DB_DIALECT); pr.put("hibernate.connection.driver_class", DB_DRIVER); EntityManagerFactory emf = Persistence.createEntityManagerFactory("students",pr); EntityManager em = emf.createEntityManager(); request.setAttribute("em", em); chain.doFilter(request, response); em.close(); ctx.log("end - " + debugMessage); } I have checked and myDbUrl is null. What I'm doing wrong? Any idea? Sorry about code, I will change it later :)

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  • Writing a program in C++ and I need help [migrated]

    - by compscinoob
    So I am a new to this. I am trying to write a program with a function double_product(vector< double a, vector< double b) that computes the scalar product of two vectors. The scalar product is $a_{0}b_{0}+a_{1}b_{1}+...a_{n-1}b_{n-1}$. Here is what I have. It is a mess, but I am trying! #include<iostream> #include<vector> using namespace std; class Scalar_product { public: Scalar_product(vector<double> a, vector<bouble> b); }; double scalar_product(vector<double> a, vector<double> b) { double product = 0; for (int i=0; i <=a.size()-1; i++) for (int i=0; i <=b.size()-1; i++) product = product + (a[i])*(b[i]); return product; } int main() { cout << product << endl; return 0; }

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  • jQuery Running a function in a context and adding to a variable

    - by Mark
    For this question I'm going to give a simplified example of what I want to do, and the function I want to learn to write. var collection = ''; <div id='container'> <span>1</span> <span>2</span> <span>3</span> </div> What I want to do this, for every span in the div, take its text, add it to the collection. So ideally it would look like: $('#container').addtoCollection(collection); The method would be something like: $(this).find('span').each(function () { collection = collection + $(this).text(); }). Where the first this would equal #container. So in the end you can do: console.log(collection); and get: 123 How do I write the function that does this? Thanks!

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  • T-SQL Tuesday #34: HELP!

    - by merrillaldrich
    I owe my career to the SQL Server community, specifically the Internet SQL Server community, so this month’s T-SQL Tuesday is especially poignant. I changed careers “cold” about eight years ago, and, while I had some educational background in computer science, I had relatively little real-world DBA experience. Someone gave me a shot in the form of an entry level job, for which I am grateful, but I also had to make the argument to him that I would figure out whatever I needed to do to be successful...(read more)

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  • Help with deleted components registry keys (2 replies)

    Hello, I did a big mistake and I deleted the path of these files in windows xp registry: System.Workflow.Activities.dll PresentationFramework.Luna.dll RedistList\\FrameworkList.xml The keys that should contain the paths are: [HKEY LOCAL MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S 1 5 18\Components\300DC0511590697408C9B53F71E7AB4A] &quot;0DC1503A46F231838AD88BCDDC8E8F7C&quot; &quot;&quot; [H...

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  • Ubuntu crashed during the update to 12.04, not I can't recover my files, help please

    - by mrah
    I'm pretty new to Linux and I've only installed Ubuntu as I couldn't afford to buy Windows, worked well and I liked it. But I chose to upgrade it to the newest version after a prompt. The update froze and the machine was unresponsive which forced me to hard reboot it. Now nothing seems to load and I've reached my wits end (mainly cos I'm lost in all the command lines). I've decided to try and recover my data from the hard drive, only two folders, by selecting the try Ubuntu option when I insert the OS CD into the machine. The problem I'm experiencing now is it won't let me copy my folders, I get a 'The folder contents could not be displayed. You do not have the permissions necessary to view the contents of "folder_name".' Does anyone know how I can recover this data?

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  • 3D Mesh Collision Help

    - by BlackAfricano
    I am new to XNA (I have only been working in it for a countable number of weeks) as well as to these forums (I have only made 1-2 other posts), so this may seem like a strange request, but I am wondering if anybody knows about more advanced collision in XNA. So far I have only been able to figure out BoundingSphere's which seem to be the simplest of the methods, and I was thinking of looking more into BoundingBoxes because the game I have is a 2-3D platformer. The problem I realized was that if I wanted to get any more advanced than stages in the shape of a box, I would face some immediate dilemmas. I was hoping somebody here was knowledgeable on the subject and could inform me where I could get started learning how to do something like this: https://www.youtube.com/watch?v=ekMD_Gtt8d4 Although the game in this video isn't very pretty, the mesh collision looks like what I'm looking for. I am hoping for the most complete solution, if possible.

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  • Please help with samba, can't access files from other computer

    - by user254074
    Maybe I am missing something but all I want to do is be able to access and transfer files from one folder on my main computer to my htpc. Both computers are running Ubuntu 14.04. I followed the instructions on this video but I am not sure if I need to do something on the HTPC to access my Movie folder. I went into nautilus then Browse Network Windows Network Workgroup but I get an error and it won't let me access it. Is there something I am doing wrong?

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  • How SEO Could Help Business

    Search engine optimisation, often abbreviated to SEO, is the process of increasing the volume of targeted traffic to your website using search engines and specifically their natural listings. Online marketers often use search engine optimisation as one branch of an online marketing campaign.

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  • Help: Visual Basic Setup Problems (26 replies)

    I picked up a book to learn Visual basic but cannot install it on my system after I download it from this site: http://www.microsoft.com/express/Windows/. I'm assuming my pc is the problem, but have no idea where to start. It seems to stat installing, but then I get a pop up that says: &quot;Microsoft Visual Basic 2008 Express Edition with SP1 ENU has encountered a problem during setup. Setup did not c...

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  • Help me choose an engine

    - by Gjorgji
    So far i've been trying to make a RTS in pygame but, i feel like 2d is not enough and pygame has me do a lot of stuff that i would not like doing. What i would like doing is working on the AI gameplay and such and not worying too much about how to display stuff,physics and the like too much. So far Unity has boo which is supposed to be similar to python i wonder if that could work. How similar is it to python should i use this? Other options as far as i can see are ogre3d python bindings and UDK. Which would best suit my needs?

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  • Help converting to C++ (6 replies)

    I have two lines of basic C# code System.IO.Directory.CreateDirectory(path); return System.IO.Directory.Exists(path); I want to bury this in a C Win32 Project. My effort so far (that does not work and I do not understand the error messages) is: #using mscorlib.dll using namespace System; using namespace System::IO; bool* clrcall;bool CDirectory(String path) { DirectoryInfo d Directory::CreateDirec...

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  • Help us improve SQL Source Control

    We've been working really hard on SQL Source Control, and need your input. We're currently working on suggestions from our user forum and on an updated migrations feature that supports all source control systems and works across branches. We'd love it if you could spare 10 minutes to complete this survey. If you complete the survey by Friday June 14, you could win a $100 Amazon voucher. There are two up for grabs!

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  • SEO Help - Top 3 Things For High Rankings

    If you're interested in what you can do in order to bring more quality traffic to your website, then this might be some of the most helpful information you'll ever hear. First of all, before you even start to build your website, there is something else you should keep in mind. And no, I'm not talking about keyword research.

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  • [Using $this when not in object context in] php error

    - by JasonS
    I have solved this problem, I just need to know what to do. I get the above error because I just realised that the class is being run as class::function($values) instead of class-function($values). Does anyone know how to convert this function to instantiate the class then run the function with values? private function _load($values=null) { define('LOADED_CONTROLLER', $this->controller); define('LOADED_FUNCTION', $this->function); $function = $this->function; $controller = new $this->controller; ($values == null) ? $controller->$function() : call_user_func_array(array($this->controller, $function), $values); }

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