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  • Where is a good place to start to learn about custom caching in .Net

    - by John
    I'm looking to make some performance enhancements to our site, but I'm not sure exactly where to begin. We have some custom object caching, but I think that we can do better. Our Business We aggregate news stories on a news type of web site. We get approximately 500-1000 new stories per week. We have index pages that show various lists of the items and details pages that show the individual stories. Our Current Use case: Getting an Individual Story User makes a request The Data Access Layer(DAL) checks to see if the item is in cache and if item is fresh (15 minutes). If the item is not in cache or is not fresh, retrieve the item from SQL Server, save to cache and return to user. Problems with this approach The pull nature of caching means that users have to pay the waiting cost every time that the cache is refreshed. Once a story is published, it changes infrequently and I think that we should replace the pull model with something better. My initial thoughts My initial thought is that stories should ALL be stored locally in some type of dictionary. (Cache or is there another, better way?). If the story is not found, then make a trip to the database, update the local dictionary and send the item back. Since there may be occasional updates to stories, this should be an entirely process from the user. I watched a video by Brent Ozar, How StackOverflow Scales SQL Server, in which Brent states "the fastest database query is the one that you don't make". Where do I start? At this point, I don't know exactly what the solution is. Is it caching? Is there a better way of using local storage? Do I use a Dictionary, OrderedDictionary, List ? It seems daunting and I'm just looking for some good starting points to learn more about how to do this type of optimization.

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  • meta.stackoverflow.com has a problem

    - by asker
    Sorry, this is off topic, but fact evolved that meta.stackoverflow does only allow posting with openid despite stating possibility of post per nick/email. Posted here because underlying prob stemmed from serverfault. So here is a copy: Despite stating that submission via nick/email were possible, required fields are not given. Please fix or state that critique be only issued non anonymously. Tags OpenID Login Get an OpenID Oops! Your question couldn't be submitted because: must include one of these tags -- bug feature-request discussion support users with less than 99 reputation can't create new tags. The tag 'limit' is new. Try using an existing tag instead. name and email, or your OpenID, are missing

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  • IIS 6 + ASP.NET web service - DW20 and stackoverflow exception

    - by pcampbell
    Consider an ASP.NET SOAP web service that starts up fine, but craters hard when receiving its first hit. Please note that this is deployment works in the Test environment, but not in the PreProd environment. Both are Windows 2003 SP3 + IIS 6 + ASP.NET 3.5. All up-to-date. The behaviour that we're seeing is: restart the site & app pool the app pool is configured to run under Network Service. browsing to the .asmx and .wsdl responds normally, as expected. send a normal well-formed SOAP request / normal payload to the web service 100% CPU usage after 5 seconds, the page request / site returns "Service Unavailable" no entry is created in the IIS log file (i.e. c:\windows\system32\logfiles\W3C-foo) the app pool ends up being stopped The processes that hit the CPU hard are dw20.exe. I am unsure why Dr Watson is involved here. Event Log shows an ASP.NET Runtime error: Task Manager: Event log text: EventType clr20r3, P1 w3wp.exe, P2 6.0.3790.3959, P3 45d6968e, P4 errormanagement, P5 1.0.0.0, P6 4b86a13f, P7 24, P8 0, P9 system.stackoverflowexception, P10 NIL. Questions Any thoughts on what this system.stackoverflow exception might be? Given that the code is the same between environments, might it be a payload problem? Could it be a configuration issue? You can see the name of my .NET assembly there in the exception message: "ErrorManagement"

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  • OAuth in Rails - google, twitter, facebook, connect for login like stackoverflow login

    - by Sam
    Rails has the rest autho plugin which works well but is there a solution for incorporating twitter, facebook, google, yahoo, etc... Seems like each on has its own plugin and demands and mixing them is going to be a mess. This is for logging in users like how Stackoverflow gets things done not for using the robust features of the APIs. What I want to do is do what stackoverflow did for login but in rails.

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  • SEO: many stackoverflow users' pages have got no Google PR and they are not indexed, why?

    - by Marco Demaio
    If you go to my user page on Stack Overflow and you check it with the Gogle bar you can see has got no PR at all (this does happen for almost any user page, even people with much higher reputation, the only exceptions seem to be the users in page 1, and some other users they have PR). My user page's Page Rank is not only zero, but not calculated at all. When PR is 0 or less than 1, but calculated the Google bar shows white, but when the PR is not even calculated like in my user page the Google bar shows in grey. I further more discovered that my user page is NOT EVEN INDEXED on Google, simple test is searching on Google for the exact page url: "http://stackoverflow.com/users/260080/marco-demaio" and you will see no result. The question is how can this be??? This is really weird to me because of the following reason: If you search on Google for "Marco Demaio" on stackoverflow site only (you can do this by searching "site:stackoverflow.com Marco Demaio") the search result shows hundreds of 'asking/answering questions' pages where I was 'tagged'!!! Let's check one of these: the 1st one that appears now (shows one of the question I asked). We can be sure this page is indexed in Google because comes out in a search moreover its PR is calculated, it's probably nearly zero, but still some PR flows there, the PR bar is not grey, but white: The page shown above has got links to my own user page. I checked the source code of the page shown above and the links are not hidden or set with a rel="nofollow", moreover I can't see any meta character excluding the links on the page from being followed. So what's happening? Why Google does not see my user page at all. Did stackoverflow do something to achieve this? If yes what did they do? Any explantion really appreciates (as always). P.S. obviously I checked also the code of my user page, but I could not find meta tags excluding Google search for the page. P.S. 2 in a desperate adventure I also checked StackOverflow robots but it does not seem to exclude user pages. UPDATE 1 following up on some answers, I did some more research. Excluding for a while the PR problem (since PR is not science), and looking only at the user page on StackOverflow NOT BEING INDEXED problem: pages do not seem to be indexed by Google because of the user reputation, this user for instance has got NOW 200 points less reputation than me and his page is indexed (while mine not). It does not seem even to be connected with months you have been on Stackoverflow, this user (almost my same reputation) has been there for 3 months only and his page is indexed (while mine not and I have been a user for 7 months). It's bizzarre! UPDATE February/2011 As of today the page got indexed by Google at least when you search for "site:stackoverflow.com Marco Demaio" it's the 1st page. The amazing thing is that it has still got NO PageRank at all: Google toolbar states loud and clear "No PageRank information available". It's odd!

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  • Optimized Publish/Subcribe JMS Broker Cluster and Conflicting Posts on StackOverFlow for the Answer

    - by Gene
    Hi, I am looking to build a publish/subscribe distributed messaging framework that can manage huge volumes of message traffic with some intelligence at the broker level. I don't know if there's a topology that describes this, but this is the model I'm going after: EXAMPLE MODEL A A) There are two running message brokers (ideally all on localhost if possible, for easier demo-ing) : Broker-A Broker-B B) Each broker will have 2 listeners and 1 publisher. Example Figure [subscriber A1, subscriber A2, publisher A1] <-- BrokerA <-- BrokerB <-- [publisher B1, subscriber B1, subscriber B2] IF a message-X is published to broker A and there no subscribers for it among the listeners on Broker-B (via criteria in Message Selectors or Broker routing rules), then that message-X will never be published to Broker-B. ELSE, broker A will publish the message to broker B, where one of the broker B listeners/subscribers/services is expecting that message based on the subscription criteria. Is Clustering the Correct Approach? At first, I concluded that the "Broker Clustering" concept is what I needed to support this. However, as I have come to understand it, the typical use of clustering entails either: message redundancy across all brokers ... or Competing Consumers pattern ... and neither of these satisfy the requirement in the EXAMPLE MODEL A. What is the Correct Approach? My question is, does anyone know of a JMS implementation that supports the model I described? I scanned through all the stackoverflow post titles for the search: JMS and Cluster. I found these two informative, but seemingly conflicting posts: Says the EXAMPLE MODEL A is/should-be implicitly supported: http://stackoverflow.com/questions/2255816/jms-consumer-with-activemq-network-of-brokers " this means you pick a broker, connect to it, and let the broker network sort it out amongst themselves. In theory." Says the EXAMPLE MODEL A IS NOT suported: http://stackoverflow.com/questions/2017520/how-does-a-jms-topic-subscriber-in-a-clustered-application-server-recieve-message "All the instances of PropertiesSubscriber running on different app servers WILL get that message." Any suggestions would be greatly appreciated. Thanks very much for reading my post, Gene

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  • How do I let programmers know something useful?

    - by Shane
    Quite often I go through pain to discover how to do something useful, in this case how to get PHP running on Google App Engine without the 'resin.jar too big' problem, but I have nowhere to let people know. In this particular case, the web answers were incomplete, outdated or plain wrong. I could create a blog, but it's overkill. I just want let programmers know a quick solution/approach. I'm not sure it's the done thing to ask a question and then answer it. In short, it'd be nice to be able to just dump a sort of combined question/answer/snippet, then let others comment as usual, shoot it down, like it, whatever. How do the rest of you approach this? Cheers, Shane

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  • How to advocate Stack Overflow at work

    - by Gordon
    I am thinking of doing a short presentation at work about using Stack Overflow as a resource for your day job. What is the experience doing this? Would you deem it a valid resource to tell you colleagues about or is it similar to telling them about Google as a resource? Is there a better way of doing it? I was leaning toward asking questions side of Stack Overflow rather than answering them to avoid you-shouldn't-be-doing-this-on-work-time argument. Just as a follow up. Originally I didn't want to make the question to specific to my own case. My presentation will only be a quick four minute talk, which I will repeat over an hour to different groups. I may ask a question before the talk on Stack Overflow and refer to it during the presentation. Hopefully I will get some activity during the hour. I am also going to talk briefly about some of the other Stack Exchange sites that would fit the audience as they are not all developers. I think Super User, Server Fault and Programmers should work well. I will not be doing the presentation for another couple of months as it has be rescheduled, but I will update on how I got on.

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  • When there's no TCO, when to worry about blowing the stack?

    - by Cedric Martin
    Every single time there's a discussion about a new programming language targetting the JVM, there are inevitably people saying things like: "The JVM doesn't support tail-call optimization, so I predict lots of exploding stacks" There are thousands of variations on that theme. Now I know that some language, like Clojure for example, have a special recur construct that you can use. What I don't understand is: how serious is the lack of tail-call optimization? When should I worry about it? My main source of confusion probably comes from the fact that Java is one of the most succesful languages ever and quite a few of the JVM languages seems to be doing fairly well. How is that possible if the lack of TCO is really of any concern?

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  • Does anyone else not enjoy this 'Required 15 Reputation' to vote situation? [migrated]

    - by Oliver Hyde
    I know, it's most likely the reason stackexchange has become so popular, by forcing people to actually contribute. But as a full-time lurker, and long time user (only recently signed up), it kind of bums me out that I don't get to give credit where credit is due. I don't generally asks questions because I always find a related question before I get myself into the situation where I need to ask and I don't like to answer questions myself as I don't consider myself experienced enough to be contributing effectively. Hopefully the first response to this post is a quick solution to getting 15 reputation points that I haven't seen, and I can just quickly delete this useless question, or maybe a concise paragraph explaining why my question is redundant and that I should go back to my lurky shadows of which I came from. All I want to do, is give credit to helpful comments/questions.

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  • What's the demonym for people who use Stack Exchange or Stack Overflow? [closed]

    - by YatharthROCK
    What's the demonym† for people who use Stack Exchange and its network of sites? There's isn't a documented answer anywhere, so I'd like to know the general consensus. Suggestions and ideas are welcome too.‡ Give one answer per site: Stack Exchange Stack Overflow Super User Server Fault And any other site you think has one unique enough :) † Demonymns for or the collective noun used to refer to the people ‡ I asked it on English.SE too. Should I have done that? Would Meta.SO have been more appropriate?

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  • empirical studies about the benefit of q&a sites on programming [on hold]

    - by nico1510
    I'm looking for empirical papers which investigate if a user can benefit from q&a sites like Stack Overflow. I welcome any papers related to this topic e.g: an experiment, investigating if a specific task can be executed faster, an analysis, investigating if a user understands the solutions on q&a sites or if he just does copy&paste without thinking about it, a comparative analysis of the code quality of users with access to q&a sites in contrast to users without internet access (but just offline documentation of APIs)

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  • How often is seq used in Haskell production code?

    - by Giorgio
    I have some experience writing small tools in Haskell and I find it very intuitive to use, especially for writing filters (using interact) that process their standard input and pipe it to standard output. Recently I tried to use one such filter on a file that was about 10 times larger than usual and I got a Stack space overflow error. After doing some reading (e.g. here and here) I have identified two guidelines to save stack space (experienced Haskellers, please correct me if I write something that is not correct): Avoid recursive function calls that are not tail-recursive (this is valid for all functional languages that support tail-call optimization). Introduce seq to force early evaluation of sub-expressions so that expressions do not grow to large before they are reduced (this is specific to Haskell, or at least to languages using lazy evaluation). After introducing five or six seq calls in my code my tool runs smoothly again (also on the larger data). However, I find the original code was a bit more readable. Since I am not an experienced Haskell programmer I wanted to ask if introducing seq in this way is a common practice, and how often one will normally see seq in Haskell production code. Or are there any techniques that allow to avoid using seq too often and still use little stack space?

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  • Const parameter at constructor causes stackoverflow

    - by Luca
    I've found this strange behavior with VS2005 C++ compiler. Here is the situation: I cannot publish the code, but situation is very simple. Here is initial code: it work perfectly class Foo { public: Foo(Bar &bar) { ... } } The constructor implementation stores a reference, setup some members... indeed nothing special. If I change the code in the following way: class Foo { public: Foo(const Bar &bar) { ... } } I've added a const qualifier to the only constructor routine parameter. It compiles correctly, but the compiler outputs a warning saying that the routine Foo::Foo will cause a stackoverflow (even if the execution path doesn't construct any object Foo); effectively this happens. So, why the code without the const parameter works perfectly, while the one with the const qualifier causes a stackoverflow? What can cause this strange behavior?

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  • Why are stackoverflow people nice? [closed]

    - by Satoru.Logic
    Hi, all. People on StackOverflow are always ready to help someone solve their problem, and I think I owe many thanks to all of those nice people. Sometimes I wonder what makes people wanna help, wanna share what they know to each other, and what makes them not. What do you think makes a community different so that ready-to-help just becomes a second nature of its members? Is there something we can learn from StackOverflow that can help us build an excellent team with ready-to-help members?

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  • could you build Stackoverflow with Drupal 7?

    - by ajsie
    im wondering if one can/should build a site like Stackoverflow with Drupal 7? we all know what Stackoverflow is and how it looks like. users <- threads <- tags and the openid stuff, validation etc. if you are going to build a site exactly as SO, will you use Drupal 6/7 or a MVC framework like CakePHP, CodeIgniter...? try to be realistic here and think about the actual work to do and how to implement with or without Drupal, not just "Drupal has nice features you can use and extend". would be helpful. thanks!

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  • StackOverflow for President

    - by Earthworm
    I was inspired to create this account today because stackoverflow has been an amazing resource and I have decided that it's time to create an account, and I hope what I can be as helpful to others as they have been to me in my endeavors. ?peace?

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  • Content management system similar to StackOverflow.com

    - by Ghostrider
    I'm looking content management system that would have features similar to stackoverflow: Users can ask and answer/questions. Users can search within existing threads. The system is access controlled - so some users can be readers/writers/admins. Some or all QnA threads should be visible only to logged in users. So far I've mostly used wordpress as CMS but it looks like it's not well-suited for this particular task

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  • Many returned records cause stackoverflow with Hibernate

    - by mimi law
    If there are many return records from DB. It will get stackoverflow problem. User is a class, which has a one to many relationship (to 3 other classes). When I print out the SQL, i found that the system runs the same query many time to get the data from DB. Does anyone know what the problem is? result.addAll(getCurrentSession().createCriteria(User.class) .add(Restrictions.ilike("name", "tom", MatchMode.ANYWHERE)) .setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY) .list());

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