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  • Results stored in a session - good idea?

    - by Nick
    To give a bit of background, lets say it's a generic results page, which is paginated so there are X results per page. Generally to do this, I have two queries on the page: to get the total number of results to get the results, limiting by the correct page's resultset However, recently I've been trying to cut down on the queries the site is making, and I thought one way to do this would be to only do the query if any parameters to the page have changed (except of course the page number)? This would then cache all the result id's in a session, which can be sliced when I need to return the correct resultset for that page. I was trying to look around the net to see if there are downsides of this method, but I've found very little information about it. Has anyone done this before? Is it a good idea?

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  • Fast, Vectorizable method of taking floating point number modulus of special primes?

    - by caffiend
    Is there a fast method for taking the modulus of a floating point number? With integers, there are tricks for Mersenne primes, so that its possible to calculate y = x MOD 2^31 without needing division. Can any similar tricks be applied for floating point numbers? Preferably, in a way that can be converted into vector/SIMD operations, or moved into GPGPU code. The primes I'm interested in would be 2^7 and 2^31, although if there are more efficient ones for floating point numbers, those would be welcome.

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  • Dash empy and blank Software Center

    - by fra_casula
    I've Ubuntu 12.10.1 LTS x62 fresh of installation... My dash is empty, search doesn't work and applications list is empty. If I run the Ubuntu Software Center it freeze in a blank screen. I tried with: restart reinstall of unity packages deleting ~/.local/share/zeitgeist folder other tricks found in the other askubuntu answers UPDATE: From ~/.xsession-errors I/O warning : failed to load external entity "/home/francesco/.compiz/session/10699c9c27649d05db134910329935534100000027470033" Initializing session options...done (compiz:2813): GConf-CRITICAL **: gconf_client_add_dir: assertion `gconf_valid_key (dirname, NULL)' failed ** (zeitgeist-datahub:3070): WARNING **: zeitgeist-datahub.vala:227: Unable to get name "org.gnome.zeitgeist.datahub" on the bus! EDIT: Deleting .cache folder solves the Ubuntu Software Center blank screen issue, thanks to jokerdino!!

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  • Google I/O 2010 - GWT Linkers target HTML5 WebWorkers & more

    Google I/O 2010 - GWT Linkers target HTML5 WebWorkers & more Google I/O 2010 - GWT Linkers target HTML5 Web Workers, Chrome Extensions, and more GWT 301 Matt Mastracci At its core GWT has a well-defined and customizable mechanism -- called Linkers -- that controls exactly how GWT's compiled JavaScript should be packaged, served, and run. This session will describe how to create linkers and explains some of the linkers we've created, including a linker that turns a GWT module into an HTML5 Web Worker and one that generates an HTML App Cache manifest automatically. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 6 1 ratings Time: 59:59 More in Science & Technology

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  • Are HTTP requests cached? [closed]

    - by nischayn22
    Many HTTP requests are sent repeatedly by browsers on almost every page load, such as requesting the jQuery .js file etc. Since these are already used on too many sites doesn't modern browsers keep a cache for this? I am thinking of a system where the browser has a cached copy of the .js file used very very frequently. On a new request for the .js file, it sends the server a request for a hash of the .js file (provided the server can reply to that) and compares the returned hash with the cached copy's hash... rest is intuitive.

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  • jquery: show data after change event

    - by klox
    i have this code: <script> $("#mod").change(function() { var matches=str.match(/(EE|[EJU]).*(D)/i); $.ajax({ type="post", url="process.php", data="matches", cache=false, async=false, success= function(res){ $('#rslt').replaceWith("<div id='value'><h6>Tuner range is" + res + " .</h6></div>"); return this; } }); return false; }); </script> i want this code can show the result normally..where is my fault?

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  • How do you share pre-calculated data between calls to a Rails web service?

    - by Nigel Thorne
    I have a Rails app that allows users to build up a network structure and then ask questions about how to navigate around it. When adding nodes and connections these are just saved to the database. At the point you make a query of the network I calculate the shortest path from any node to any other node. Constructing this in memory takes a while (something I need to fix), but once it is there, you can instantly get the answer to any of these path questions. The question is... How do I share this network between calls to the website, so each request doesn't regenerate the paths network each time? Note: I am hosting this on apache server using passenger (mod ruby) Thoughts?

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  • Java application failing on special characters.

    - by Scottm
    An application I am working on reads information from files to populate a database. Some of the characters in the files are non-English, for example accented French characters. The application is working fine in Windows but on our Solaris machine it is failing to recognise the special characters and is throwing an exception. For example when it encounters the accented e in "Gérer" it says :- Encountered: "\u0161" (353), after : "\'G\u00c3\u00a9rer les mod\u00c3" (an exception which is thrown from our application) I suspect that in order to stop this from happening I need to change the file.encoding property of the JVM. I tried to do this via System.setProperty() but it has not stopped the error from occurring. Are there any suggestions for what I could do? I was thinking about setting the basic locale of the solaris platform in /etc/default/init to be UTF-8. Does anyone think this might help? Any thoughts are much appreciated.

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  • How to implement proper identification and session managent on json post requests?

    - by IBr
    I have some minor messaging connection to server from website via json requests. I have single endpoint which distributes requests according to identification data. I am using asynchronous server and handle data when it comes. Now I am thinking about extending requests with some kind of session. What is the best way to define session? Get cookie when registered and use token as long as session runs with each request? Should I implement timeout for token? Is there alternative methods? Can I cache tokens to same origin requests? What could I use on client side (Web browser)? How about safety? What techniques I should use to throw away requests with malformed data, to big data, without choking server down? Should I worry?

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  • apt-get could not open lock file

    - by user114373
    I am trying to get an nfs client running on a Sheeva-plug running debian 2.6.22. The host is Ubuntu 12.04 and claims (from showmount -e) to be exporting the desired directory. There is no showmount binary in the sheeva-plug, so I'm trying to install it from the nfs-common package: # apt-get install nfs-common The response ends with E: could not open lock file /var/cache/apt/archives/lock - open (no such file or directory) E: Unable to lock the download directory. I am root while doing this. Similar errors arise when trying to install other packages. How do I correct these errors so apt-get will do its work?

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  • What framework for text rating site?

    - by problemofficer
    I want to start a "rate my"-style site. The rated objects are mostly texts. I want it to be rather simple. Features I need: object rating (thumb up, thumb down) object comments object tags related object presentation based on tags user authentication and management private message system sanity checks for text inputs (i.e. prevention of code injections) cache open source runs on GNU/Linux I would gladly take something that is tailored for my scenario but a generic framework would be fine too. I simply don't want to write stuff like user authentication that is been written a million times and risking security flaws. Programming language is irrelevant but python/php preferred.

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  • CSS not loading when site is viewed via Windows VPN

    - by Dreamling
    Internal site has recently been redesigned, but IE8 does not seem to be loading the new css rules only when viewed via VPN. I really have no clue what to look for. I can't reproduce the problem, but it's apparently affecting client for the last month. I've suggested: Reloading IE8 Checking Internet Permissions Flushing the cache I'm not really certain what direction to search for the answer. Is it likely to be a server permissions issue? a VPN connection issue? a rare ie8 CSS bug?

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  • How do I create stand alone packages from ubuntu repository

    - by tachyons
    Is it possible to create a stand alone deb packages by merging dependancies without manual repacking.?? I've looked at this question but it doesn't really answer what I'm trying to achieve above. if possible how to do it? update 1 No tools available yet(?) So what about creating new deb package containing all packages which will copy dependencies to the cache and executing main package. Is it possible? update 2 Above method appears to be impossible because dpkg cant handle more than one operation at a time. Some scripts may can do it update 3 this tool is very helpful but it currently wont support oneric and above still waiting for more generic tool Thanks in advance

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  • Is there an apt command to download a deb file from the repositories to the current directory?

    - by Lekensteyn
    I am often interested in the installation triggers (postinst, postrm) or certain parts of packages (like /usr/share and /etc). Currently, I am running the next command to retrieve the source code: apt-get source [package-name] The downside is, this file is often much bigger than the binary package and does not reflect the installation tree. Right now, I am downloading the packages through http://packages.ubuntu.com/: Search for [package-name] Select the package Click on amd64/i386 for download Download the actual file This takes too long for me and as someone who really likes the shell, I would like to do something like the next (imaginary) command: apt-get get-deb-file [package-name] I could not find something like this in the apt-get manual page. The most close I found was the --download-only switch, but this puts the package in /var/cache/apt/archives (which requires root permissions) and not in the current directory.

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  • Visual Studio Load Tests Virtual Users Simulation

    - by Eldar
    Hello, I'm currently working on writing a load testing application that takes advantage of Load Test using Visual Studio 2010. The load test will simulate 20 users on the same machine, and I need some data to be shared in-memory between all simulated users. I was suprised I couldn't find documentation answering the following question: What seperates each virtual user's running context from the other? Does each virtual user runs the tests in its own process? Maybe in its own app domain? Or just on its own thread? I need to know because if each user is running tests in its own process then all the in-memory cache isn't shared and is created for each user instead of one time for all of them, which is bad for me.

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  • how to download and install from the internet >> skype and realplayer

    - by ADAM
    i had corrupted win7 by dead blue screen and stopped rebooting or installing or safe mode. just death i installed linux unubtu one i still unable to install my wireless stick modem for surfing internet wirelessly form my provider vividwireless i don't know where or how to download porg and app from the net like real player and skype and others and to intall them. even i cannot find them after download. can i revive and reboot or fix my dead win7 os from linux. i can connect internet from wireless network in the neighborhood linksys!! what is linksys anyway? how to use linux ubuntu same way like windows? ie. insalling, using cd rom for installation and downloading and cleaning history and cache and system restore? please email me to: [email protected] any help..step by step many thanks

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  • How can I convince a project manager that there is no way to solve all the compatibility issues?

    - by SAFAD
    I have been working on this project for more than a year now, and we are close to release, the project manager wants the product to be perfect and working in every single aspect. I like that and I love working under the perfection idea, but it seems he is delaying the launch too much because of compatibility issues, he wants the product to work in every single installation, every single configuration possible, and in most cases, the product just works without issues when it's on the hands of the client. UPDATE : yes the product doesn't work properly when there are conflicts, for example, other products that don't use guidelines nor standards to load libraries (causes double library load which leads to failure), cache is another example and so on..... but we warn the clients about the conflict before purchasing and help them fixing it after purchasing I've tried to explain it by giving some examples on major products, he understands the situation, but can not believe that it is near impossible (if it is not impossible) to do what he wants. Hope it is clarified enough for the community to answer.

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  • Why are the proposed BADSIG (on apt-get update) fixes secure?

    - by EvanED
    I'm running apt-get update, and I see errors like W: GPG error: http://us.archive.ubuntu.com precise Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <[email protected]> It's not hard to find instructions on how to fix these problems, for instance by asking for the new keys with apt-key adv --recv-keys or rebuilding the cache; so I'm not asking about how to fix these. But why is this the right thing to do? Why is "oh, I need new keys? Cool, go get new keys" not just defeating the purpose of having a signed repository in the first place? Are the keys signed by a master key that apt-key checks? Should we be doing some additional validation to ensure that we're getting legitimate keys?

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  • How can I run a complete application from RAM?

    - by pico
    When I do some stuff in background (unpacking, compiling, backup, etc.) my hdd is under load and for example, Firefox and Chromium take very long to start and react very slow. While my hdd is under load I have still plenty of free RAM and free CPU. How can I copy the whole Firefox or Chromium including all dependencies into RAM? I don't care about persistence, I just want to view some websites, videos, etc. There are instructions putting the cache into /dev/shm, but that didn't speed up so much. Getting the profile into the RAM drive might also be easy... But how to get the binaries with all dependencies into RAM?

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  • Navigation for ASP.NET Web Forms project published on codeplex

    Navigation for ASP.NET Web Forms manages movement and data passing between aspx Pages in a unit testable manner. There is no Client-side logic, so it works in all browsers, and no Server-side cache, so it works with the browser back button.Features include loosely coupled Pages, typed data passing, empty code-behinds, context-sensitive bread crumb trail, ASP.NET Data binding integration, automatic ASP.NET Ajax history navigation and many more.The source code, binaries and comprehensive documentation...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • How to efficiently implement a blocking call with Rails, while letting the client wait for the reply

    - by Kyle Heironimus
    We have a web service written in Rails. The API is published and we cannot change it. Our app communicates with a remote web service that sometimes hangs or takes several seconds to reply. Client -> Our Web Service -> Remote Web Service Currently, if the remote web service hangs for 5 seconds, one of our rails processes on our web service also hangs with it, which is what we need to avoid. I've seen things such as mod-x-sendfile, modporter, and delayed jobs, but the best I can tell, they all assume the client is not waiting for an answer. Since the API is already established, we cannot tell the client "I'm attempting to do what you want, check back later for the answer." The best option we have come up with so far is to add a second, non-rails web server running eventmachine to process these particular calls. Is there a better way?

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  • Google s'offre une nouvelle interface, et optimise l'intelligence de ses recherches

    Google s'offre une nouvelle interface, et optimise l'intelligence de ses recherches Google s'est offert un lifting de printemps. La page d'accueil du moteur de recherche et si sobre et discrète que le moindre changement n'y passe pas inaperçu. Depuis aujourd'hui, Google.com a une nouvelle présentation. A côté d'un logo aux couleurs plus vives, le site se divise en trois panneaux : à gauche, les options ; au centre, les résultats ; et à droite, la publicité. L'onglet des options, d'habitude caché par défaut, est mis en avant. Un moyen de pousser les internautes à tester ces filtres de recherche qui ne sont pas nouveaux, mais encore trop méconnus du grand public. Par exemple, "update" : la recherche en temps...

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  • Jquery select add values from json

    - by brabertaser1992
    I have such json: [ { "MOD_AXL": 0, "MOD_CDS_ID": 110000168, "MOD_CV": 0, "MOD_CV_CTM": null, "MOD_ID": 168, "MOD_MFA_ID": 514, "MOD_PC": 1, "MOD_PCON_END": 199007, "MOD_PCON_START": 196303, "MOD_PC_CTM": null, "Name": "2 CV"}, { "MOD_AXL": 0, "MOD_CDS_ID": 110004500, "MOD_CV": 0, "MOD_CV_CTM": null, "MOD_ID": 4500, "MOD_MFA_ID": 514, "MOD_PC": 1, "MOD_PCON_END": 198810, "MOD_PCON_START": 197808, "MOD_PC_CTM": null, "Name": "ACADIANE"}, { "MOD_AXL": 0, "MOD_CDS_ID": 110001660, "MOD_CV": 0, "MOD_CV_CTM": null, "MOD_ID": 1660, "MOD_MFA_ID": 514, "MOD_PC": 1, "MOD_PCON_END": 197712, "MOD_PCON_START": 196301, "MOD_PC_CTM": null, "Name": "AMI"} // etc..etc.. ]? But how to set as select value MOD_ID, and as text of select option: Name? I have this data in text: $(".man-select").change(function(){ var mfa_id = $(".man-select").val(); console.log(mfa_id); $.ajax({ url: "/get_models_for_mfa/mfa_id="+mfa_id+".json", type: "GET", data: {}, success: function(text) //here is object { console.log("getted"); $('.mod-select') .append($("<option></option>") .attr("value",text) .text(text)); }, error: function(){ //alert('?????? javascript'); }, dataType : "html" }); });

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  • One subdomain is not working

    - by BFTrick
    Hello there, My main domain works just fine - www.example.com and a subdomain set up by another developer works as well - sub1.example.com. But when I try to set another subdomain up I go through the process everything seems to work. The software creates the default files where the subdomain files should go. But when I try to browse there it doesn't work. My host uses Plesk to do all of the hosting stuff. What do you think the problem is? I doubt it is some sort of cache issue because I had problems on my phone which I tried after problems on the pc. Maybe for some reason Plesk needs time to set this up? I have used Cpanel before and that works instantly.

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  • Software Center won't take into account my changed OpenID name: any idea?

    - by Pascal Av
    Failing to install IntelliJ from the Software Center, I realized my login is wrong in the /etc/apt/auth.conf entry that the install process generates. In this file, I see my original OpenID, that's the one which got automatically generated when signing up on Launchpad. It contains my last name so I changed it. I purged conf and binaries for Ubuntu One, reinstalled, deleted all listed "Devices" from app, all "Applications" from Launchpad. Deleted ~/.cache/software-center/, reboot, but still: When installing IntelliJ, the auth.conf file receives my original OpenID, not the modified one Problem is that the commercial subscription, for IntelliJ private PPA, uses my modified OpenID, so authentication attempt fails. I can't remove nor modify this subscription, even by changing back my OpenID into Launchpad. Any idea to solve this?

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