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• Deferred rendering order?

  - by Nick Wiggill

  There are some effects for which I must do multi-pass rendering. I've got the basics set up (FBO rendering etc.), but I'm trying to get my head around the most suitable setup. Here's what I'm thinking... The framebuffer objects: FBO 1 has a color attachment and a depth attachment. FBO 2 has a color attachment. The render passes: Render g-buffer: normals and depth (used by outline & DoF blur shaders); output to FBO no. 1. Render solid geometry, bold outlines (as in toon shader), and fog; output to FBO no. 2. (can all render via a single fragment shader -- I think.) (optional) DoF blur the scene; output to the default frame buffer OR ELSE render FBO2 directly to default frame buffer. (optional) Mesh wireframes; composite over what's already in the default framebuffer. Does this order seem viable? Any obvious mistakes?

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• Slap the App on the VM for every private cloud solution! Really ?

  - by Anand Akela

  One of the key attractions of the general session "Managing Enterprise Private Cloud" at Oracle OpenWorld 2012 was an interactive role play depicting how to address some of the key challenges of planning, deploying and managing an enterprise private cloud. It was a face-off between Don DeVM, IT manager at a fictitious enterprise 'Vulcan' and Ed Muntz, the Enterprise Manager hero .   Don DeVM is really excited about the efficiency and cost savings from virtualization. The success he enjoyed from the infrastructure virtualization made him believe that for all cloud service delivery models ( database, testing or applications as-a-service ), he has a single solution - slap the app on the VM and here you go . However, Ed Muntz believes in delivering cloud services that allows the business units and enterprise users to manage the complete lifecycle of the cloud services they are providing, for example, setting up cloud, provisioning it to users through a self-service portal ,  managing and tuning the performance, monitoring and applying patches for database or applications. Watch the video of the face-off , see how Don and Ed address some of the key challenges of planning, deploying and managing an enterprise private cloud and be the judge ! ?

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• How can I get ssh-agent working over ssh and in tmux (on OS X)?

  - by Rich

  I have a private key set up for my github account, the passphrase to which is, I believe, stored in OS X's keychain. I certainly don't have to type it in when I open a terminal window and enter ssh [email protected]. However, when I'm running bash over an ssh session, or locally inside a tmux session, I have to type in the passphrase every single time I attempt to ssh to github. This question suggests that a similar problem exists with screen, but I don't really understand the issue well enough to fix it in tmux. There's also this page which includes a fairly complicated solution, but for zsh. EDIT: In response to @Mikel's answer, from a local terminal I get the following output: [~] $ echo $SSH_AUTH_SOCK /tmp/launch-S4HBD6/Listeners [~] $ ssh-add -l 2048 [my key fingerprint] /Users/richie/.ssh/id_rsa (RSA) [~] $ typeset -p SSH_AUTH_SOCK declare -x SSH_AUTH_SOCK="/tmp/launch-S4HBD6/Listeners" Whereas over ssh or in tmux I get: [~] $ echo $SSH_AUTH_SOCK [~] $ ssh-add -l Could not open a connection to your authentication agent. [~] $ typeset -p SSH_AUTH_SOCK bash: typeset: SSH_AUTH_SOCK: not found echo $SSH_AGENT_PID returns nothing whatever shell I run it from.

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• thick client migration to web based application

  - by user1151597

  This query is related to application design the technology that I should consider during migration. The Scenario: I have a C#.net Winform application which communicates with a device. One of the main feature of this application is monitoring cyclic data(rate 200ms) sent from the device to the application. The request to start the cyclic data is sent only once in the beginning and then the application starts receiving data from the device until it sends a stop request. Now this same application needs to be deployed over the web in a intranet. The application is composed of a business logic layer and a communication layer which communicates with the device through UDP ports. I am trying to look at a solution which will allow me to have a single instance of the application on the server so that the device thinks that it is connected as usual and then from the business logic layer I can manage the clients. I want to reuse the code of the business layer and the communication layer as much as possible. Please let me know if webserives/WCF/ etc what i should consider to design the migration. Thanks in advance.

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• What is the difference between a plain Amazon ec2 instance and beanstalk?

  - by Alex Ford

  I am a solo developer and the sites I'm deploying are very small, usually hobby sites and I have a few questions about the Amazon services. Is there a reason for me to use beanstalk or should I just stick with a single ec2 instance? Should I use RDS for database? I heard someone say that I could just install a database on my ec2 instance, making it cheaper. I'm trying to keep everything as cheap as possible. I need to point custom domains to my sites. Pretty sure that means I have to deal with elastic IPs. Do those work with beanstalk or only with individual ec2 instances? Thanks in advance!

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• Unreasonably slow stunnel

  - by Kit Sunde

  I setup stunnel on OSX to tunnel traffic to my Django dev server because Facebook needs HTTPS these days but I noticed it's being absurdly slow. It seems like it can only handle a single connection at a time and even the connection is slow when I'm connecting to localhost. I've tried using some performance tips found online and so my config is setup as: pid= # foreground=yes cert=./cacert.pem key=./privkey.pem libwrap=no debug=0 socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 [https] accept=8443 connect=8000 Is there a way to get more performance or more suitable way of setting up HTTPS for my dev server?

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• Moviebarcodes Showcases Entire Movies as Frame-based Barcodes

  - by Jason Fitzpatrick

  If you’ve ever wanted a chance to look at at an entire movie in a single glance, here’s your chance. Moviebarcodes shares mock-barcodes generated by turning each frame of a movie into a thin stripe, offering a glimpse into the color choices and shot lengths in popular movies. The barcode seen above was generated from The Matrix; you can see where the green indicates scenes that were shot inside the matrix and thus given a subtle green tint. In the barcode below, generated from the movie Pleasantville you can see the transition in the movie between the color and black and white scenes. In the case of Pleasantville, elements of the black and white world turning to color represent pivotal moments in the plot development which are now neatly mapped out below: Check out the hundreds of barcodes at the link below; you can even order prints of your favorite movies. Find a great rendering in the mix? Share a link in the comments below. Moviebarcodes [via Cool Inforgraphics] How to Create an Easy Pixel Art Avatar in Photoshop or GIMPInternet Explorer 9 Released: Here’s What You Need To KnowHTG Explains: How Does Email Work?

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• MySQL Locking Up

  - by Ian

  I've got a innodb table that gets a lot of reads and almost no writes (like, 1 write for every 400,000 reads approx). I'm running into a pretty big problem though when I do INSERT into the table. MySQL completely locks up. It uses 100% cpu, and every single other table (in other databases even) have their statuses set to "Locked" until the INSERT is done. This is a big problem because MySQL stays locked up for up to 4 minutes. I'm using version 5.1.47 (rpm from mysql.com). Any ideas?

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• emulate dual monitor using a second machine

  - by Hemal Pandya

  I have monitors of my two machines side by side and I use them both with a single keyboard/mouse using Google Synergy+ which works great. But is it possible to use the monitor of my secondary machine as the secondary monitor of my primary? I am on XP so from what I understand I cannot just rdc from secondary to this primary. In any case that would be a different session altogether and I would prefer to be able to extend my desktop over the two monitors. Any solutions or suggestions? Thanks in advance.

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• emulate dual monitor using a second machine

  - by Hemal Pandya

  I have monitors of my two machines side by side and I use them both with a single keyboard/mouse using Synergy+ (now hosted at Google Code) which works great. But is it possible to use the monitor of my secondary machine as the secondary monitor of my primary? I am on XP so from what I understand I cannot just rdc from secondary to this primary. In any case that would be a different session altogether and I would prefer to be able to extend my desktop over the two monitors. Any solutions or suggestions? Thanks in advance.

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• SOA Suite 11g Purging Guide

  - by ShawnBailey

  We now have a single source of truth concerning Purging in My Oracle Support. The material is contained within the SOA 11g Infrastructure Database: Installation, Maintenance and Administration Guide under the 'Purging' tab. All of the previous purge related content for 11g is now deprecated and many of the documents will redirect to this Guide while others simply contain a disclaimer. What does the Guide contain? Summary Overview of Purging. What it does and why it's important Specific information on each release of 11g Available patches for each release of 11g and recommendations How to run the different purge scripts Tips on improving performance How to begin troubleshooting problems with the process How to identify orphaned records Useful reference information Here are a couple of screen shots to help with navigation: Guide Landing Page: (click image for full view) Select the 'Purging' tab: (click image for full view) The left menu contains the following options: Alternative: Database Partitioning What to do on 11gR1 GA (11.1.1.1) What to do on PS1 (11.1.1.2) What to do on PS2 (11.1.1.3) What to do on PS3 (11.1.1.4) What to do on PS4 (11.1.1.5) Overview of PS5 (11.1.1.6) Purging Step by Step Performance Tips Troubleshooting Purge Orphaned Records Reference This resource goes hand in hand with the excellent documents SOA 11g Database Growth Management Strategy and Start Small, Grow Fast available on OTN. The latest product documentation can be found here.

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• Naming a class that processes orders

  - by p.campbell

  I'm in the midst of refactoring a project. I've recently read Clean Code, and want to heed some of the advice within, with particular interest in Single Responsibility Principle (SRP). Currently, there's a class called OrderProcessor in the context of a manufacturing product order system. This class is currently performs the following routine every n minutes: check database for newly submitted + unprocessed orders (via a Data Layer class already, phew!) gather all the details of the orders mark them as in-process iterate through each to: perform some integrity checking call a web service on a 3rd party system to place the order check status return value of the web service for success/fail email somebody if web service returns fail constantly log to a text file on each operation or possible fail point I've started by breaking out this class into new classes like: OrderService - poor name. This is the one that wakes up every n minutes OrderGatherer - calls the DL to get the order from the database OrderIterator (? seems too forced or poorly named) - OrderPlacer - calls web service to place the order EmailSender Logger I'm struggling to find good names for each class, and implementing SRP in a reasonable way. How could this class be separated into new class with discrete responsibilities?

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• Setting up Raid 1 Array for Home Server

  - by user1048116

  I'm not sure if this is even possible, but it's worth asking on here! Essentially I have a old machine at home (well, not old hardware wise, but I recently built a new gaming rig), which I decided to install a copy of W2008 R2 on and use as a file/backup server and media center'ish machine. As of now, it has a single drive partitioned into C and D, with D being the Data partition. I have happened to find an old 1TB SATA drive lying around at home, and was wondering if it's possible to setup a Raid 1 array in my rig within Windows without needing to lose everything on my first drive (or maybe even just mirror a specific partition, say the Data partition, as this is just what stores my photos etc). Maybe this isn't possible, but you never know :) Regards, T.C

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• excel - merge cells including a zip code

  - by evanmcd

  Hi all, I have the need to merge a bunch of cells that comprise an address (street, city, state, zip) into a single cell. No problem except with the zip code. The zip cell has only 4 digits for any zip that starts with 0. So, I change it's format to be Special - Zip Code. That makes the cell itself show the beginning 0, but the merged cell still does not show the leading 0. Does anyone know how to get the leading 0 in the merged column? Thanks Evan

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• What determines which Javascript functions are blocking vs non-blocking?

  - by Sean

  I have been doing web-based Javascript (vanilla JS, jQuery, Backbone, etc.) for a few years now, and recently I've been doing some work with Node.js. It took me a while to get the hang of "non-blocking" programming, but I've now gotten used to using callbacks for IO operations and whatnot. I understand that Javascript is single-threaded by nature. I understand the concept of the Node "event queue". What I DON'T understand is what determines whether an individual javascript operation is "blocking" vs. "non-blocking". How do I know which operations I can depend on to produce an output synchronously for me to use in later code, and which ones I'll need to pass callbacks to so I can process the output after the initial operation has completed? Is there a list of Javascript functions somewhere that are asynchronous/non-blocking, and a list of ones that are synchronous/blocking? What is preventing my Javascript app from being one giant race condition? I know that operations that take a long time, like IO operations in Node and AJAX operations on the web, require them to be asynchronous and therefore use callbacks - but who is determining what qualifies as "a long time"? Is there some sort of trigger within these operations that removes them from the normal "event queue"? If not, what makes them different from simple operations like assigning values to variables or looping through arrays, which it seems we can depend on to finish in a synchronous manner? Perhaps I'm not even thinking of this correctly - hoping someone can set me straight. Thanks!

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• Question about a simple design problem

  - by Uri

  At work I stumbled uppon a method. It made a query, and returned a String based on the result of the query, such as de ID of a customer. If the query didn't return a single customer, it'd return a null. Otherwise, it'd return a String with the ID's of them. It looked like this: String error = getOwners(); if (error != null) { throw new Exception("Can't delete, the flat is owned by: " + error); } ... Ignoring the fact that getCustomers() returns a null when it should instead return an empty String, two things are happening here. It checks if the flat is owned by someone, and then returns them. I think a more readable logic would be to do this: if (isOwned) { throw new Exception("Can't delete, the flat is owned by: " + getOwners()); } ... The problem is that the first way does with one query what I do with two queries to the database. What would be a good solution involving good design and efficiency for this?

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• What is the minimum delay between two consecutive RS232 frames?

  - by Lord Loh.

  I have been working on creating a UART on an FPGA. I can successfully transmit and receive single characters typed on PuTTY. However, when I set my FPGA to constantly write a large sequences of "A", sometimes I end up with a sequences of "@" or some other characters until I reset the FPGA a few times. I believe the UART on the computer looses track of the difference between the start bit and a zero. The delay between the two "A" is ~ 30us (measured with a logic analyzer) and the baud rate is 115200 8N1. Is there a minimum delay that must be maintained between two consecutive RS232 frames?

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• How to remotely install Linux via SSH?

  - by netvope

  I need to remotely install Ubuntu Server 10.04 (x86) on a server currently running RHEL 3.4 (x86). I'll have to be very careful because no one can press the restart button for me if anything goes wrong. Have you ever remotely installed Linux? Which way would you recommend? Any advice for things to watch out? Update: Thanks for your help. I managed to "change the tires while driving"! The main components of my method are drawn from HOWTO - Install Debian Onto a Remote Linux System, grub legacy: Booting once-only, grub single boot and kernel panic reboot , and Ubuntu Community Documentation: InstallationFromKnoppix Here is the outline of what I did: Run debootstrap on an existing Ubuntu server Transfer the files to the swap partition of the RHEL 3.4 server Boot into tha swap partition (the debootstrap system) Transfer the files to the original root partition Boot into the new Ubuntu system and finish up the installation with tasksel, apt-get, etc I tested the method in a VM and then applied to the server. I was lucky enough that everything went smoothly :)

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• Wordpress 3 mutli site install

  - by mike

  Hello, Trying to figure out if this is possible... My company has a cms product that was written in Java and we decided to use Wordpress to run blogs for our clients. Obviously, Wordpress does not run on tomcat(at least not by default) so we installed Pound(http://www.apsis.ch/pound/) on our server and have setup any Apache and Tomcat on different ports. When "/blog/" is requested, the request is directed to Apache. This works fine but we would like to use Wordpress multi site so that we can manage all the blogs from a single interface. We would also like the url for every site to be "/blog/" example: http://www.site1.com/blog/ http://www.site2.com/blog/ I'm thinking it would have to be done with apache??? Is it even possible? Thanks!

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• Staggering java linux process startup to prevent OOM

  - by ctennis

  I am running a number of java processes on a single Linux machine. From a memory and computing standpoint, everything is fine when things are static. However, periodically we use a configuration management package up upgrade the jar or war files, and restart the java process. The problem is, that is restarts them all relatively quickly, and so we get 10 or so java VMs restarting all at the same time (we use daemontools for the service stops/starts), which wreaks havoc on the machine, in terms of OOMs or just really slow. This is because it's spawning the JVM 10x at the same time. Other than trying to stagger the startups, is there a smarter way of handling this? Maybe a sysctl tuning performance parameters, or a JVM parameter?

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• Possible to draw a select portion of a render target? (in XNA)

  - by TheBroodian

  I'm going to try to do this in reverse fashion and skip straight to the punch line, and then give the back story afterward: Is it possible to, after drawing a scene to a RenderTarget2D, only draw a select portion of the RenderTarget2D, if I don't want the entire thing? I'm using xTile to manage world data in my game (it's a great piece of work, colinvella [xTile's author] has made an amazing product), and for the most part it works great. xTile supports parallax effects in its layers to add some wonderful depth to 2d scenes, which was great, until I implemented a dynamic split-screen system into my game. Wanted to make a co-op game that wouldn't require players to be in close proximity to each other, so I made it so that if the players separate too far apart, the singular full-screen viewport 'snaps-apart', and is replaced by two split-screen viewports, which then smoothly transition to their respective player targets. The effect is pretty smooth aside from the part where the parallax backgrounds become skewed once the viewports split, because xTile's ratio for handling parallax effects is dependent upon viewport size. This is unfortunate, because the effect would otherwise be really snazzy, but the backgrounds become pretty heavily affected when the game goes from single-viewport to multi-viewport. So, Colinvella suggests using rendertargets to record the scene at full viewport size, and then only drawing a portion of it. But as far as I can tell, that isn't even possible? That being said, I've never even used render targets before, so I'm still learning, hence the question here.

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• two-part dice pool mechanic

  - by bythenumbers

  I'm working on a dice mechanic/resolution system based off of the Ghost/Echo (hereafter shortened to G/E) tabletop RPG. Specifically, since G/E can be a little harsh with dealing out consequences and failure, I was hoping to soften the system and add a little more player control, as well as offer the chance for players to evolve their characters into something unique, right from creation. So, here's the mechanic: Players roll 2d12 against the two statistics for their character (each is a number from 2-11, and may be rolled above or below depending on the nature of the action attempted, rolling your stat exactly always fails). Depending on the success for that roll, they add dice to the pool rolled for a modified G/E style action. The acting player gets two dice anyhow, and I am debating offering a bonus die for each success, or a single bonus die for succeeding on both of the statistic-compared rolls. One the size of the dice pool is set, the entire pool is rolled, and the players are allowed to assign rolled dice to a goal and a danger. Assigned results are judged as follows: 1-4 means the attempted goal fails, or the danger comes true. 5-8 is a partial success at the goal, or partially avoiding the danger. 9-12 means the goal is achieved, or the danger avoided. My concerns are twofold: Firstly, that the two-stage action is too complicated, with two rolls to judge separately before anything can happen. Secondly, that the statistics involved go too far in softening the game. I've run some basic simulations, and the approximate statistics follow: 2 dice (up to) 3 dice (up to) 4 dice failure ~33% ~25% ~20% partial ~33% ~35% ~35% success ~33% ~40% ~45% I'd appreciate any advice that addresses my concerns or offers to refine my simulation (right now the first roll is statistically modeled as sign(1d12-1d12), where 0 is a success).

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• How to code Time Stop or Bullet Time in a game?

  - by David Miler

  I am developing a single-player RPG platformer in XNA 4.0. I would like to add an ability that would make the time "stop" or slow down, and have only the player character move at the original speed(similar to the Time Stop spell from the Baldur's Gate series). I am not looking for an exact implementation, rather some general ideas and design-patterns. EDIT: Thanks all for the great input. I have come up with the following solution public void Update(GameTime gameTime) { GameTime newGameTime = new GameTime(gameTime.TotalGameTime, new TimeSpan(gameTime.ElapsedGameTime.Ticks / DESIRED_TIME_MODIFIER)); gameTime = newGameTime; or something along these lines. This way I can set a different time for the player component and different for the rest. It certainly is not universal enough to work for a game where warping time like this would be a central element, but I hope it should work for this case. I kinda dislike the fact that it litters the main Update loop, but it certainly is the easiest way to implement it. I guess that is essentialy the same as tesselode suggested, so I'm going to give him the green tick :)

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• Using 4 monitors with 2 generic video cards... possible?

  - by Ikram

  I'm thinking of setting up 4 monitors in a grid, using two video cards, one card to feed each pair of monitors through the card's two DVI ports. The most important requirement for me is to have the grid of monitors act as one single huge screen. Is this scenario possible by using two generic cards like Radeon 4870s on a Windows 7 computer? (I've heard of Eyefinity, but 4870s don't have it) Another issue is that I only have one PCI-Express slot on my computer's motherboard, therefore I'll need to use one of the lesser PCI cards as the second video card. Will this pose problems?

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• Storing User-uploaded Images

  - by Nyxynyx

  What is the usual practice for handling user uploaded photos and storing them on the database and server? For a user profile image: After receiving the image file from user, rename file to <image_id>_<username> Move image to /images/userprofile Add img filename to a table users containing their profile details like first_name, last_name, age, gender, birthday For a image for a review done by user: After receiving the image file from user, rename file to <image_id>_<review_id> Move image to /images/reviews Add img filename to a table reviews containing their profile details like review_id, review_content, user_id, score. Question 1: How should I go about storing the image filenames if the user can upload multiple photos for a particular review? Serialize? Question 2: Or have another table review_images with columns review_id, image_id, image_filename just for tracking images? Will doing a JOIN when retriving the image_filename from this table slow down performance noticeably? Question 3: Should all the images be stored in a single folder? Will there be a problem when we have 100K photos in the same folder? Is there a more efficient way to go about doing this?

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