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• Exception in thread "main" java.lang.OutOfMemoryError, How to find and fix??

  - by or.nomore

  hey, I'm trying to programming a crossword creator. using a given dictionary txt file and a given pattern txt file. The basic idea is using DFS algorithm. the problem begin when the dictionary file is v-e-r-y big (about 50000 words). then i recive the : Exception in thread "main" java.lang.OutOfMemoryError: GC overhead limit exceeded i know that there is a part in my program that waists memory, but i don't know where it is, how to find it and how to fix it

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• how to develop a program to minimize errors in human transcription of hand written surveys

  - by Alex. S.

  I need to develop custom software to do surveys. Questions may be of multiple choice, or free text in a very few cases. I was asked to design a subsystem to check if there is any error in the manual data entry for the multiple choices part. We're trying to speed up the user data entry process and to minimize human input differences between digital forms and the original questionnaires. The surveys are filled with handwritten marks and text by human interviewers, so it's possible to find hard to read marks, or also the user could accidentally select a different value in some question, and we would like to avoid that. The software must include some automatic control to detect possible typing differences. Each answer of the multiple choice questions has the same probability of being selected. This question has two parts: The GUI. The most simple thing I have in mind is to implement the most usable design of the questions display: use of large and readable fonts and space generously the choices. Is there something else? For faster input, I would like to use drop down lists (favoring keyboard over mouse). Given the questions are grouped in sections, I would like to show the answers selected for the questions of that section, but this could slow down the process. Any other ideas? The error checking subsystem. What else can I do to minimize or to check human typos in the multiple choice questions? Is this a solvable problem? is there some statistical methodology to check values that were entered by the users are the same from the hand filled forms? For example, let's suppose the survey has 5 questions, and each has 4 options. Let's say I have n survey forms filled in paper by interviewers, and they're ready to be entered in the software, then how to minimize the accidental differences that can have the manual transcription of the n surveys, without having to double check everything in the 5 questions of the n surveys? My first suggestion is that at the end of the processing of all the hand filled forms, the software could choose some forms randomly to make a double check of the responses in a few instances, but on what criteria can I make this selection? This validation would be enough to cover everything in a significant way? The actual survey is nation level and it has 56 pages with over 200 questions in total, so it will be a lot of hand written pages by many people, and the intention is to reduce the likelihood of errors and to optimize speed in the data entry process. The surveys must filled in paper first, given the complications of taking laptops or handhelds with the interviewers.

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• What size paper or white board do you use for brainstorming / planning ?

  - by Naveen

  Use a small notepad, and turning pages interferes with flow of thought. Use a whiteboard and marker, and you write bigger when you are standing up, so you don't necessarily get more ideas on the board... A friend of mine has his entire wall in his office, lab made up of whiteboard material... This is a more specific question on a related topic.

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• Javascript (and HTML rendering) engine without a GUI for automation?

  - by MTsoul

  Are there any libraries or frameworks that provide the functionality of a browser, but do not need to actually render physically onto the screen? I want to automate navigation on web pages (Mechanize does this, for example), but I want the full browser experience, including Javascript. Thus, I'd like to have a virtual browser of some sort, that I can use to "click on links" programmatically, have DOM elements and JS scripts render within it, and manipulate these elements. Solution preferably in Python, but I can manage others.

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• How is "Make Object ID" implemented in the .NET debugger?

  - by Omer Raviv

  Hi, I would like know how this feature is implemented in VS - I understand it holds some sort of weak-reference to the object in the debugged-application's memory, but how exactly is it accomplished? I know simply tracking the address (as in native code) wouldn't work, because the GC might move the object about, invalidating the address. Thanks.

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• Why should I not use an ASP.NET datagrid control in MVC

  - by No Soup for YOU

  I don't want to make this into a "which is better... MVC or WebForms" type of question. Im sure that has been asked a bunch of times here already. My Question: If I am building a MVC web project, why should I not use an ASP.NET datagrid control on one of my "Views" .aspx pages?

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• Cocoa - does CGDataProviderCopyData() actually copy the bytes? Or just the pointer?

  - by jtrim

  I'm running that method in quick succession as fast as I can, and the faster the better, so obviously if CGDataProviderCopyData() is actually copying the data byte-for-byte, then I think there must be a faster way to directly access that data...it's just bytes in memory. Anyone know for sure if CGDataProviderCopyData() actually copies the data? Or does it just create a new pointer to the existing data?

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• Displaying very large images on the iPad

  - by Brodie4598

  I need to display some very large images on the iPad. The files are jpgs and are about 6700x2700 (maps). Is there any way around loading the entire image into memory? Currently I load it int a scroll view for zooming/panning. The images are stored locally on the device.

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• Monitoring my web application performance from the client browser

  - by The Machine

  Hi, I want to be able to monitor the performance(load time of the entire page, load times of individually downloaded js/cs files , amount of memory used by the browser for the page,etc) of my web application from the perspective of the user(i.e the browser client). Is there any tool/plugin , that can help me monitor all of these?

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• how can we avoid allocation done by Marshal::StringToHGlobalAnsi?

  - by KaluSingh Gabbar

  my wrapper from managed to unmanaged is handling a lot of data and this Guy would call new for each of them, which is a big hit for me. So my question is : can I allocate a chunk of unmanaged memory and use it to convert the managed data types to unmanaged by hand.

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• Ruby - Read file in batches

  - by Algorist

  Hi, I am reading a file that is 10mb in size and which contains some id's. I read them into a list in ruby. I am concerned that it might cause memory issues in the future, when the number of id's in file might increase. Is there a effective way of reading a large file in batches? Thank you

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• Where is the most appropriate location to check "Querystring is needed, else redirect"?

  - by Mike

  Hi, I have an ASP.NET application. On some pages it requires a specific querystring to be called with the page, so data can be processed. Where is the most appropriate place to check whether the required querystring is included in the URL, otherwise redirect to somewhere else? I have only used one masterpage. Thoughts and suggestions would be appreciated. Thanks.

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• Data mining google's web search results?

  - by cheesebunz

  Currently, i have a google web search. If a user searches starbucks, I would only want to retrieve the company or product information, not some other weird links like blog pages, using javascript, is it possible to do so? if yes, how am i able to do it? Kind of a newbie in the data mining part..thanks! Added my coding for download for clearer understanding : http://www.mediafire.com/?mzgo233kngm

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• Is Work Stealing always the most appropriate user-level thread scheduling algorithm?

  - by Il-Bhima

  I've been investigating different scheduling algorithms for a thread pool I am implementing. Due to the nature of the problem I am solving I can assume that the tasks being run in parallel are independent and do not spawn any new tasks. The tasks can be of varying sizes. I went immediately for the most popular scheduling algorithm "work stealing" using lock-free deques for the local job queues, and I am relatively happy with this approach. However I'm wondering whether there are any common cases where work-stealing is not the best approach. For this particular problem I have a good estimate of the size of each individual task. Work-stealing does not make use of this information and I'm wondering if there is any scheduler which will give better load-balancing than work-stealing with this information (obviously with the same efficiency). NB. This question ties up with a previous question.

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• PHP Sessions - Locking and Sharing questions

  - by Nuno Peralta

  Hi, I would like to know if it is possible to read $_SESSION attributes without locking it. Currently, session_start() locks SESSION, that means other PHP processes will wait until it is unlocked. But, some processes just want to get some $_SESSION variables, not to write on them. Is that possible to implement some function like session_get(string $id) which doesn't lock SESSION? Also, it is possible to share SESSIONs between browsers, once the user is logged in the same account, for example, using session_id('shared_vars_of_'.$userid). But, is that secure? Is this discouraged? Thanks, Nuno

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• Where to start .NET Entity Framework and ORM?

  - by Freshblood

  Hello I haven't used any database system enough but i believe i know logic of databases and i have learnt little sql so i shouldn't start to learn ORM before learn them well? Where can i start to learn .NET Entity Framework and which version of framework i have to start 3.5 or 4.0 because i heard that 4.0 has strong support for Entity Framework.I am looking sources web pages,e-books or other else.

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• What server side technologies does uefa.com use?

  - by olst

  Hi all. I was wondering if anyone knows in what technology/web platform the uefa.com website was built. Its page suffix is ".html", but I don't see how it could be built with just html, since it probably has a lot of dynamic content... Anyway, it's a great website with fast loading pages and nice design. Does anyone know who built it ? ... thanks ...

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• When does a PHP script end?

  - by allyourcode

  In my mind, a web app something that runs continuously; therefore, I'm confused by documentation pages that talk about the "end" of a PHP script (eg this one). Such references seem to refer to the end of each web request, but if the script ends there, doesn't that mean that the OS has to setup a whole new process for each request? That seems unlikely, because spinning up a whole new process is expensive, and be very inefficient for the whole site.

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• Firefox, prevent rendering between javascript statements.

  - by Erik

  I'm trying to create some kind of zoom around the mouse cursor feature on my website which ultimately runs these two lines (+ the same for height/scrollTop). canvas.style.width = someValue; canvas.parentNode.scrollLeft = someOtherValue; The problem is that in firefox(3.6) the page is re-rendered directly after the first row has been executed and since the view is depending on both values this means that every time i recalculate the view firefox will will render an invalid view before the correct one, in other words creating flicker. I've tried swapping the two rows but get the same problem. In chrome, opera and IE this doesn't happen. Both lines are executed before any rendering is done. Is there any way to lock the rendering manually, maybe something like this? document.disableRendering(); //fantasy function canvas.style.width = someValue; canvas.parentNode.scrollLeft = someOtherValue; document.enableRendering(); //fantasy function

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• What is the use of DTD in HTML

  - by shoaibmohammed

  Hello, Could anyone specify what is the need and use of the Document Type Definition in HTML pages. What is the advantages of it? I searched through the Net and found the results to be little bit confusing. Please someone highlight

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• How to see live stats of website performance (IIS7)?

  - by TruMan1

  In task manager, I am only able to see the resources w3wp.exe is using, but this is too vague. Can I see the resources each website and app pool is using? Would also be nice if I can see what pages are taking up the most resources (all in real-time). Does anything exist like this?

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• google site rank from search word

  - by user72185

  Hi, is it possible (a Google API or something) to get the ranking of a website given a search word? It's the code equivalent of doing a Google search for a word, then browsing through the results until you find the website you look for. By ranking I mean the position in the pages found, e.g. the site is number 4000 when searching for some word. Thanks!

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• Stuck at being unable to print a substring no more than 4679 characters

  - by Newcoder

  I have a program that does string manipulation on very large strings (around 100K). The first step in my program is to cleanup the input string so that it only contains certain characters. Here is my method for this cleanup: public static String analyzeString (String input) { String output = null; output = input.replaceAll("[-+.^:,]",""); output = output.replaceAll("(\\r|\\n)", ""); output = output.toUpperCase(); output = output.replaceAll("[^XYZ]", ""); return output; } When i print my 'input' string of length 97498, it prints successfully. My output string after cleanup is of length 94788. I can print the size using output.length() but when I try to print this in Eclipse, output is empty and i can see in eclipse output console header. Since this is not my final program, so I ignored this and proceeded to next method that does pattern matching on this 'cleaned-up' string. Here is code for pattern matching: public static List<Integer> getIntervals(String input, String regex) { List<Integer> output = new ArrayList<Integer> (); // Do pattern matching Pattern p1 = Pattern.compile(regex); Matcher m1 = p1.matcher(input); // If match found while (m1.find()) { output.add(m1.start()); output.add(m1.end()); } return output; } Based on this program, i identify the start and end intervals of my pattern match as 12351 and 87314. I tried to print this match as output.substring(12351, 87314) and only get blank output. Numerous hit and trial runs resulted in the conclusion that biggest substring that i can print is of length 4679. If i try 4680, i again get blank input. My confusion is that if i was able to print original string (97498) length, why i couldnt print the cleaned-up string (length 94788) or the substring (length 4679). Is it due to regular expression implementation which may be causing some memory issues and my system is not able to handle that? I have 4GB installed memory.

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• C# Resources - How to find actual language file in use?

  - by Chris Meek

  I have a number resx files as follows, Resources-es-ES.resx Resources-es.resx Resources.resx (english defaults) They are compiled into an assembly and I use them for localising my web pages by simply referring to Resources.Ok for example. My question is whether there is a way to find out the "rendered culture", e.g. if I come into the site with my CurrentUICulture set to "fr-fr" for example it will fall back to using the English resources and I'm wondering how to get that information to help me with some JavaScript localisation.

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• Is this ISession handled by the SessionScope - Castle ActiveRecord

  - by oillio

  Can I do this? I have the following in my code: public class ARClass : ActiveRecordBase<ARClass> { ---SNIP--- public void DoStuff() { using (new SessionScope()) { holder.CreateSession(typeof(ARClass)).Lock(this, LockMode.None); ...Do some work... } } } So, as I'm sure you can guess, I am doing this so that I can access lazy loaded references in the object. It works great, however I am worried about creating an ISession like this and just dropping it. Does it get properly registered with the SessionScope and will the scope properly tare my ISession down when it is disposed of? Or do I need to do more to manage it myself?

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