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• Throttle connections to web service if load gets too high?

  - by Joseph Turian

  I have a web site that communicates via XMLRPC with an XMLRPC server web service. (The web service is written in Python using xmlrpclib.) I believe that xmlrpclib will block while it is handling one request. So if there are three users with an xmlrpclib request ahead of you, your response takes four times as long. How do I handle it if I receive too many XMLRPC requests and the web service gets bogged down and has slow response time? If I am getting slashdotted, my preferred behavior is that the first users get good response times and everyone else is told to come back later. I think this is superior to giving everyone terrible response times. How do I create this behavior? Is this called load-balancing? I am not actually balancing though, until I have multiple servers.

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• PDF booklet printing

  - by Diego

  I have a Samsung ML-2851nd printer (laser, duplex) When printing booklets from PDF files, what is best? Printing with "standard" Page Scaling from Reader, and selecting Booklet printing from the Printer Properties Using the Booklet Printing option from Reader, and only selecting "Print on Both Sides" in the Printer Properties. If I go with the first option, can I use Page Scaling "None" to get bigger text or will it cause any problems? (Fit to printable area shrinks to 93%, I'm using A4 paper) If I go with the second one, what's the correct setting: "Flip on Long Edge" or "Flip on Short Edge"? Thanks!

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• Client/server application RPC connection gets disconnected very frequently

  - by Chris Thompson

  I have a client/server application that uses RPC for the client to communicate with the server. Fairly regularly, I get an event in the Application log that the RPC connection was disconnected: Client callback failed ((0x80010108) ) I have the Windows Firewall disabled on both machines. I've even run the client on a second computer with a clean Windows XP install without any group policies. This has been going on for a long time and no one has been able to figure out why it's happening. The same client/server app works fine at other client locations. Any thoughts?

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• Tutuorial for Quick Look Generator for Mac

  - by vgm64

  I've checked out Apple's Quick Look Programming Guide: Introduction to Quick Look page in the Mac Dev Center, but as a more of a science programmer rather than an Apple programmer, it is a little over my head (but I could get through it in a weekend if I bash my head against it long enough). Does anyone know of a good basic Quick Look Generators tutorial that is simple enough for someone with only very modest experience with Xcode? For those that are curious, I have a filetype called .evt that has an xml header and then binary info after the header. I'm trying to write a generator to display the xml header. There's no application bundle that it belongs to. Thanks!

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• How to install mod_wsgi 3.1 on Ubuntu 9.10

  - by pthulin

  I have a Python 3 web app so mod_wsgi < 3.1 doesn't cut it for me. However, on my Ubuntu 9.10 installation there doesn't seem to be a package for mod_wsgi 3.1. Is there an alternative repository that has a package for mod_wsgi 3.1? There's a new Ubuntu release not so long from now, will it contain mod_wsgi 3.1? Some other distro ready with mod_wsgi 3.1 to recommend? Maybe my best bet is to compile it myself? From a quick google it looks like I only need the python and apache dev packages installed. Thanks!

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• How can I better implement A star algorithm with a very large set of nodes?

  - by Stephen

  I'm making a game with nodejs in which many enemies must converge on the player as the player moves around a relatively open space (right now it is an open field with few obstacles, but eventually there may be some small buildings in the field with 1 or 2 rooms). It's a multiplayer game using websockets, so the server needs to keep track of enemies and players. I found this javascript A* library which I've modified to be used on the server as a nodejs module. The library utilizes a Binary Heap to track the nodes for the algorithm, so it should be pretty fast (and indeed, with a small grid, say 100x100 it is lightning fast). The problem is that my game is not really tile-based. As the player moves around the map, he is moving on a more or less 1-to-1 per-pixel coordinate system (the player can move in 8 directions, 1 or 2 pixels at a time). In preliminary tests, on an 800x600 field, the path-finding can take anywhere from 400 to 1000 ms. Multiply that by 10 enemies and the game starts to get pretty choppy. I have already set it up so that each enemy will only do a path-finding call once per second or even as slow as once every 2 seconds (they have to keep updating their path because the players can move freely). But even with this long interval, there are noticeable lag spikes or chops every couple of seconds as the enemies update their paths. I'm willing to approach the problem of path-finding differently, if there's another option. I'm assuming that the real problem is the enormous grid (800x600). It also occurs to me that maybe the large arrays are to blame, as I've read that V8 has trouble with large arrays.

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• Distinction between API and frontend-backend

  - by Jason

  I'm trying to write a "standard" business web site. By "standard", I mean this site runs the usual HTML5, CSS and Javascript for the front-end, a back-end (to process stuff), and runs MySQL for the database. It's a basic CRUD site: the front-end just makes pretty whatever the database has in store; the backend writes to the database whatever the user enters and does some processing. Just like most sites out there. In creating my Github repositories to begin coding, I've realized I don't understand the distinction between the front-end back-end, and the API. Another way of phrasing my question is: where does the API come into this picture? I'm going to list some more details and then questions I have - hopefully this gives you guys a better idea of what my actual question is, because I'm so confused that I don't know the specific question to ask. Some more details: I'd like to try the Model-View-Controller pattern. I don't know if this changes the question/answer. The API will be RESTful I'd like my back-end to use my own API instead of allowing the back-end to cheat and call special queries. I think this style is more consistent. My questions: Does the front-end call the back-end which calls the API? Or does the front-end just call the API instead of calling the back-end? Does the back-end just execute an API and the API returns control to the back-end (where the back-end acts as the ultimate controller, delegating tasks)? Long and detailed answers explaining the role of the API alongside the front-end back-end are encouraged. If the answer depends on the model of programming (models other than the Model-View-Controller pattern), please describe these other ways of thinking of the API. Thanks. I'm very confused.

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• Stereo images rectification and disparity: which algorithms?

  - by alessandro.francesconi

  I'm trying to figure out what are currently the two most efficent algorithms that permit, starting from a L/R pair of stereo images created using a traditional camera (so affected by some epipolar lines misalignment), to produce a pair of adjusted images plus their depth information by looking at their disparity. Actually I've found lots of papers about these two methods, like: "Computing Rectifying Homographies for Stereo Vision" (Zhang - seems one of the best for rectification only) "Three-step image recti?cation" (Monasse) "Rectification and Disparity" (slideshow by Navab) "A fast area-based stereo matching algorithm" (Di Stefano - seems a bit inaccurate) "Computing Visual Correspondence with Occlusions via Graph Cuts" (Kolmogorov - this one produces a very good disparity map, with also occlusion informations, but is it efficient?) "Dense Disparity Map Estimation Respecting Image Discontinuities" (Alvarez - toooo long for a first review) Anyone could please give me some advices for orienting into this wide topic? What kind of algorithm/method should I treat first, considering that I'll work on a very simple input: a pair of left and right images and nothing else, no more information (some papers are based on additional, pre-taken, calibration infos)? Speaking about working implementations, the only interesting results I've seen so far belongs to this piece of software, but only for automatic rectification, not disparity: http://stereo.jpn.org/eng/stphmkr/index.html I tried the "auto-adjustment" feature and seems really effective. Too bad there is no source code...

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• New PeopleSoft Applications Search

  - by Matthew Haavisto

  As you may have seen from the PeopleTools 8.52 Release Value Proposition , PeopleTools intends to introduce a new search capability in release 8.52. We believe this feature will not only improve the ability of users to find content, but will fundamentally change the way people navigate around the PeopleSoft ecosystem. PeopleSoft applications will be delivering this new search in coming releases and feature packs. PeopleSoft Application Search is actually a framework—a group of features that provides an improved means of searching for a variety of content across PeopleSoft applications. From a user experience perspective, the new search offers a powerful, keyword-based search presented in a familiar, intuitive user experience. Rather than browsing through long menu hierarchies to find a page, data item, or transaction, users can use PeopleSoft Application Search to directly navigate to desired locations. We envision this to be similar to how people navigate across the internet. This capability may reduce or even eliminate the need to navigate PeopleSoft applications using the existing application menu system (though menus will still be available to people that prefer that method). The new search will be available at any point in an application and can be configured to span multiple PeopleSoft applications. It enables users to initiate transactions or navigate to key information without using the PeopleSoft application menus. In addition, filters and facets will enable people to narrow their search results sets, making it easier to identify and navigate to desired application content. Action menus are embedded directly in the search results, allowing users to navigate straight to specific related transactions – pre-populated with the selected search results data. PeopleSoft Applications Search framework uses Oracle’s Secure Enterprise Search as its search engine. Most Customers will benefit from the new search when it is delivered with applications. However, customers can start deploying it after a Tools-only upgrade. In this case, however, customers would have to create their own indices and implement security.

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• Logging library for (c++) games

  - by Klaim

  I know a lot of logging libraries but didn't test a lot of them. (GoogleLog, Pantheios, the coming boost::log library...) In games, especially in remote multiplayer and multithreaded games, logging is vital to debugging, even if you remove all logs in the end. Let's say I'm making a PC game (not console) that needs logs (multiplayer and multithreaded and/or multiprocess) and I have good reasons for looking for a library for logging (like, I don't have time or I'm not confident in my ability to write one correctly for my case). Assuming that I need : performance ease of use (allow streaming or formating or something like that) reliable (don't leak or crash!) cross-platform (at least Windows, MacOSX, Linux/Ubuntu) Wich logging library would you recommand? Currently, I think that boost::log is the most flexible one (you can even log to remotely!), but have not good performance update: is for high performance, but isn't released yet. Pantheios is often cited but I don't have comparison points on performance and usage. I've used my own lib for a long time but I know it don't manage multithreading so it's a big problem, even if it's fast enough. Google Log seems interesting, I just need to test it but if you already have compared those libs and more, your advice might be of good use. Games are often performance demanding while complex to debug so it would be good to know logging libraries that, in our specific case, have clear advantages.

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• Online Media Daily: Oracle Takes Social Marketing Seriously

  - by Richard Lefebvre

  In the article published on Nov 12, 2012 and titled "Oracle Integrates Social Marketing Into Enterprise To Gain Marketing Revs," Online Media Daily explores Oracle's approach to social marketing. The publication says that Oracle is focused on showing marketers how to integrate social data into corporate business processes and how to "socialize" the corporate world. The article goes on to state:"Enterprise software companies like Oracle, SAP, IBM, Salesforce and Microsoft have been slowly building up an expertise in social marketing to integrate the data into traditional enterprise resource planning, and customer relationship management tools into social marketing tools.   Enterprise software companies like Oracle, SAP, IBM, Salesforce and Microsoft have been slowly building up an expertise in social marketing to integrate the data into traditional enterprise resource planning, and customer relationship management tools into social marketing tools.    Read more: http://www.mediapost.com/publications/article/187096/oracle-integrates-social-marketing-into-enterprise.html#ixzz2CPMZ1w3D Meg Bear, VP of cloud social platform at Oracle, sees the integration with ERP systems as a differentiator for the company. Oracle Social Relationship Management launched last month. It integrates social data into traditional enterprise applications like Oracle Fusion Marketing, Oracle Fusion Sales Catalog, Oracle ATG Web Commerce and Oracle ERP." The post goes on to quote a Forrester analyst stating the following:""There's room for any process-driven application to run more efficiently, especially if they're socially enabled," said Rob Koplowitz, VP and principal analyst at Forrester Research. "It takes the human part of the process not generally captured today to provide better access to content, information and collective actions." Koplowitz said several acquisitions support Oracle's long-term vision: to layer social on top of other enterprise apps, like its ERP platform." With many great acquisitions under our belt and organically grown social tools, the market recognizes that Oracle is poised to seize the moment in socially enabled business apps. Continue reading the full article here.

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• Software RAID 10 on Linux

  - by vpetersson

  For a long time, I've been thinking about switching to RAID 10 on a few servers. Now that Ubuntu 10.04 LTS is live, it's time for an upgrade. The servers I'm using are HP Proliant ML115 (very good value). It has four internal 3.5" slots. I'm currently using one drive for the system and a RAID5 array (software) for the remaining three disks. The problem is that this creates a single-point-of-failure on the boot drive. Hence I'd like to switch to a RAID10 array, as it would give me both better I/O performance and more reliability. The problem is only that good controller cards that supports RAID10 (such as 3Ware) cost almost as much as the server itself. Moreover software-RAID10 does not seem to work very well with Grub. What is your advice? Should I just keep running RAID5? Have anyone been able to successfully install a software RAID10 without boot issues?

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• Advantage of using nexenta vs. OpenSolaris

  - by jotango

  I am currently building a NAS for about 24 TB of storage. Video files, slow access, long term storage. No performance issues. I am currently undecided between buying a JBOD case and installing OpenSolaris (because of ZFS), or purchasing a Nexenta license. The difference is about $ 12.500 for licenses over three years. What would you see as the main advantage in purchasing a nexenta license, beside the support? Did nexenta really enhance the basic OpenSolaris, or is it just a lot of marketing speak? No one really wanted to answer that question.

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• Keep your Root Authorities up to date

  - by John Breakwell

  Originally posted on: http://geekswithblogs.net/Plumbersmate/archive/2013/06/20/keep-your-root-authorities-up-to-date.aspxBy default, Windows will automatically update it’s internal list of trusted root authorities as long as the Update Root Certificates function is installed. This should be enabled by default and takes manual intervention to remove it. With this component enabled, the following happens: If you are presented with a certificate issued by an untrusted root authority, your computer will contact the Windows Update Web site to see if Microsoft has added the CA to its list of trusted authorities. If it has been added to the Microsoft list of trusted authorities, its certificate will automatically be added to your trusted certificate store. If the component is not installed and a certificate from an untrusted CA is encountered then the following text will be seen: This is an inconvenience for the person browsing the site as they need to click to continue. Applications, though, will be unable to proceed and will throw an exception. Example: ERROR_WINHTTP_SECURE_FAILURE 12175 (0x00002F8F) One or more errors were found in the Secure Sockets Layer (SSL) certificate sent by the server. If you look at the certificate’s properties, you can see the “Issued by:” value:   This must match a Trusted Root Certificate Authority in the current user’s certificate store.   So turn on automatic updating of trusted root authority certificates. For Windows Vista and above, this option is controlled through Group Policy. See the “To Turn Off the Update Root Certificates Feature by Using Group Policy” section of the following Technet article: Certificate Support and Resulting Internet Communication in Windows Vista If Windows Update is a blocked site then download and deploy the latest pack of root certificates from Microsoft: Update for Root Certificates For Windows XP [May 2013] (KB931125)   Failing that, find a machine that has the latest root certificates installed and export them from there: Open up the Certificates console. Right-click the required Trusted Root Certificate Authority certificate Choose Export from “All Tasks” to open up the Certificate Export Wizard Choose an export file format – DER should be fine Provide a file name and complete the export. Move the file to the machine that’s missing the certificate Right-click the file and choose “Install Certificate” to open up the Certificate Import Wizard Allow the wizard to automatically select the certificate store and complete the import On a side note, for troubleshooting certificate issues it can be helpful to clear the SSL state:

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• How to relink user folders in Windows 7

  - by Jonathan

  The short story: Win7 lost track of my user folders location (desktop, my documents, my pictures etc...). They now reside on a different partition. How can I relink these folders? The long story: The way I partition my drives is: C: - SSD drive for Windows and Program Files D: - A large regular hard drive for all my user data The first thing I do after a fresh Win7 install is move my user folders to D:, by right clicking on these folders under C:\users\username\, choosing the Location tab and clicking on Move. I've just completed encryption of D: using TrueCrypt. It shows a lot of warnings before the encryption process, but (hrrmm...) it does not mention the fact that after encryption the data is located on a new drive letter, say E: This broke Win7's links to my special user folders. How can I relink these folders?

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• F5 BigIP upgrade from 9.x to 10.x

  - by mbuk2k

  Having a few difficulties upgrading a Big IP 3400 from 9.4.8 to any version 10.x image. The following are the versions I've tried: 10.1.0.3341.0 10.2.2.763.3 10.2.3.112.0 10.2.4.577.0 To upgrade I'm running the following command: image2disk --format=volumes BIGIP-10.1.0.3341.0.iso Obviously replacing the version number with the relevant image I'm trying to upgrade to each time. The F5 reboots, and starts copying packages however after 30 seconds or so just stops copying. The cursor in the console is still flashing but no matter how long it's left, the package doesn't copy. It seems to be a different package with each version/image (but always the same package per version) at point of freezing, which I'm guessing is suggesting a space issue? I've checked free space on the device and it has over 2GB free at root which should surely be enough? If anyone has any advice or pointers, it would be kindly appreciated. Thank you

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• Java issues on OpenVZ Ubuntu 11.04 (.jar/.sh files)

  - by IWillNotChange

  I've had a whole line of messes with java and .jar files. I've tried both OpenJDK (from software installer) and about three repositories for Sun. /Desktop# java -jar -Xmx1024m ss.jar Exception in thread "main" java.awt.HeadlessException at java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:173) at java.awt.Window.<init>(Window.java:476) at java.awt.Frame.<init>(Frame.java:419) at java.awt.Frame.<init>(Frame.java:384) at javax.swing.JFrame.<init>(JFrame.java:174) at org.powerbot.bd.<init>(Unknown Source) at org.powerbot.Boot.main(Unknown Source) Two separate errors: ~/Desktop# ./ss.sh [SEVERE] org.server.Boot: Default heap size of 490m too small, restarting with 768m and about 30 different crashes were it just "aborts" with a huge file dump. Each time I've tried something a little different, whether it be updating Java or just changing -Xmx1024 to -Xmx1024m to get rid of the heap. Personally I think it has something to do with OpenVZ, but Google hasn't saved me this time, I need someone who can get to the bottom of my problem. java -version java version "1.6.0_26" Java(TM) SE Runtime Environment (build 1.6.0_26-b03) Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02, mixed mode) is my current install. Running ss.sh gives me: (I'd post the entire log but its long) # # A fatal error has been detected by the Java Runtime Environment: # # SIGILL (0x4) at pc=0x00002b14278e6fa0, pid=9301, tid=47365590714112 # # JRE version: 6.0_26-b03 # Java VM: Java HotSpot(TM) 64-Bit Server VM (20.1-b02 mixed mode linux-amd64 compressed oops) # Problematic frame: # C [ld-linux-x86-64.so.2+0x14fa0] _dl_make_stack_executable+0x2b50 # # If you would like to submit a bug report, please visit: # http://java.sun.com/webapps/bugreport/crash.jsp # The crash happened outside the Java Virtual Machine in native code. # See problematic frame for where to report the bug. # I'm willing to let someone who knows what they are talking about view it and try and sort this out. Any help would be appreciated, I've about pulled all my hair Googling to no avail.

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• powertop keeps telling me to turn off the same thing, over and over

  - by Rory McCann

  I am running an ubuntu lucid laptop on battery. I want to make my power last as long as possible. Aswell as the normal things like turn down screen brightness, and turn off wifi, I'm using powertop. It will sometimes tell me things, e.g.: Suggestion: Enable USB autosuspend by pressing the U key OK, I press the U key to do that. However a few minutes later it will give me the same suggestion, it's as if it never enabled USB autosuspend the first time. It does this for other things aswell, not just USB autosuspend. e.g. it'll give me this message frequently: An audio device is active 100.0% of the time: hwC0D1 LSI ID 1040 Q - Quit R - Refresh A - Turn HD audio powersave on Is there anything I can do to make these choices 'stick'? Or do I have some unfortunatle hardware that won't obey linux? (If so, is there any way to confirm this?)

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• MIA

  - by Robert May

  So, I’ve been missing in action on this blog for quite some time.  I need to rectify that. Part of the reason I’ve been absent is because I haven’t be able to talk about what I’m working on.  A former client watches my blog rather closely, and although we accomplished many good things together, their culture is such that they really don’t like people to freely express their thoughts (you’ll note my blog posts stopped rather abruptly).  I learned some really important lessons about Agile in the last 3 years, and I think its worthwhile to talk about them.  Sometimes things worked really well, sometimes, they failed failed.  Sometimes that failure was me, sometimes it wasn’t. I understand Agile better now, and hopefully, what I have to say will guide others through this process and help others understand Agile better. One thing that I’ve learned is that MANY companies that say they are doing Agile are NOT really doing Agile.  To often, they pick the things they like and don’t follow the process long enough to know what rules they can break, and which ones they shouldn’t.  This is probably the primary reason why Agile fails. So, expect more posts, especially as I’m flying coast to coast. :)

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• MOSS 2007 authentication

  - by Dante

  Hi, I have a MOSS web site configured with Windows Integrated Authentication. I added a couple of local users in the server, added them to Sharepoint groups, and I can log into my site (as long as the local user is part of the administrators group... odd). If I add a domain user to the Owners group, I can't access the site with it. Anybody knows what must be done to open access to domain users in a site configured with Windows Authentication or Basic Authentication? Thanks in advance

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• Windows 7 x64 how to verify integrity of ALL files on an NTFS disk?

  - by kilves76

  Looking for a tool that would verify integrity of ALL files on a Windows 7 x64 NTFS disk reliably? This is for testing of experimental defrag software, so it really needs to be secure and foolproof. I know it will take a long time, there's millions of files on the disk, but safety just cannot be compromised in a situation like this. Freeware solution much preferred. Can be either Windows software (=inducing pitfalls about files changing due to booting Windows) or a stand alone boot (for example linux boot cd + usb key for storing chksum/metadata).

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• Cannot access or open Facebook messages [migrated]

  - by Ehsan Mamakani

  I was up to sending a very long message, about 90,000 characters, to a friend, I tried several times but I got an error sending the message. Finally, I think part of my message was sent because I could see the characters in my message list under my friend's name. When I clicked the name to see my whole message it wouldn't load the message. And now I can't access any of my messages and I get this message from Facebook: Sorry, messages are temporarily unavailable. Please try again in a few minutes. How can I get access to my messages and conversations again?

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• Reminders about unresponded emails?

  - by ulidtko

  In my daily e-mail often happens the following scenario: I send somebody an email which describes some problem and requests an action from the recipient. Typically, I wish to ensure that this action was taken, or at least somehow resolved; when this happens, the email recipient should notify me with a response email about what was done, and what was not and why. But, sometimes emails don't get read by the recipient, or he forgets to reply to me. At the same time, I cannot constantly keep in memory the list of all emails for which I was waiting an answer and still didn't receive it. So I wonder, is there in any email client such a feature which would allow me to somehow mark specific outgoing emails as "demanding reply"? The mail client could in this case notify me if any "demanding reply" emails still aren't replied for a long time.

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• Allow and restrict remote sql server access

  - by Michel

  Hi, I want to expose my sql server instance via the internet. I've been programming asp.net to sql server for a long time, but for the first time i'm hosting the sql server myself instead of the clients server. So what i want to do is move my sql server from my dev machine at home to a virtual server (yet to hire). But of course i don't want anyone to just enter my sql server but just a few persons. So what i was thinking was to allow only a few ip addresses to the sql server instance. Can anyone tell me how i can expose my sql server to the internet and limit the access to the instance to only a few ip addresses? And ehm, if you know even better ways to secure it, i'd be happy, because this is the first time for me :) Michel

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• Error with TextMate 2 --shell-escape and gnuplot 10.8.2

  - by Manuel

  I have had TM 1.X since a long time ago, but a week ago I updated my system to Mountain Lion 10.8.2 and installed TM2. The problem is that I write with LaTeX, and sometimes I use gnuplot for the graphs (I installed gnuplot with macports). But now it doesn't work because the --shell-escape doesn't work, this is the error message I get: Package pgfplots Error: Sorry, the gnuplot-result file '"untitled 2.pgf-plot.table"' could not be found. Maybe you need to enable the shell-escape feature? For pdflatex, this is ' pdflatex -shell-escape'. You can also invoke ' gnuplot .gnuplot' manually on the respective gnuplot file.. And then, looking around I discovered that it's not just gnuplot but everything which needs --shell-escape. Question What happened? How can I get TM have the correct rights so this works? It worked right in Snow Leopard with TM 1.5.

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