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• Python Multiprocessing with Queue vs ZeroMQ IPC

  - by Imraan

  I am busy writing a Python application using ZeroMQ and implementing a variation of the Majordomo pattern as described in the ZGuide. I have a broker as an intermediary between a set of workers and clients. I want to do some extensive logging for every request that comes in, but I do not want the broker to waste time doing that. The broker should pass that logging request to something else. I have thought of two ways :- Create workers that are only for logging and use the ZeroMQ IPC transport Use Multiprocessing with a Queue I am not sure which one is better or faster for that matter. The first option does allow me to use the current worker base classes that I already use for normal workers, but the second option seems quicker to implement. I would like some advice or comments on the above or possibly a different solution.

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• Depth is disabled - How to turn on?

  - by marc wellman

  In XNA 3.1 is there any other way to disable depth in 3D Worlds using DirectX models other than GraphicsDevice.RenderState.DepthBufferEnable = false; ? The reason for my question is I have quite a huge program which offers a 3D World with a couple of 3D DirectX models inside. Depth was never an issue since it ever worked fine but since a few days after doing some modifications my models are all depth-translucent i.e. depth-buffering and/or culling seems to be disabled. But in my whole source code I never touch any of the options related to Depth or Culling which means I never turn these settings on explicitly nor turn it off somewhere. So I am searching for some other statement maybe related to the GraphicsDevice that implicitly turns depth off - but I can't find it. (Sorry that I don't post any source code but I have too much source code and I simply don't know where to search) UPDATE: These are a couple of simple objects seen with correct depth. These are the same objects in their current state.

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• Will making players pay a virtual currency before entering a match discourage them from playing?

  - by Bane

  I'm making a multiplayer match-making game, and by my current design, people will need to pay a small fee before joining a match. At the end of the match, the team that won will get the money. That will be a virtual currency, but still, will it discourage people to enter matches? I introduced it to make the matches matter more, because there's always a fear that you will loose your investments. I'm not talking about anything big here, but even a small amount might have a similar psychological effect as a bigger one.

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• errors with libosmscout [migrated]

  - by Katlego Moukangwe

  I am using the libosmscout library for routing and I get the following error when I run the Routing demo; Routing . 169639811 169639816 169639831 253045594 //Running the routing demo with the map in the current directory. Cannot get start way! There was an error while calculating the route! I think It might be during the import stage since I get the following warnings; !! Cannot resolve way member 28693141 for relation 28322 boundary_administrative Mecklenburg-Vorpommern !! Cannot resolve way member 152675051 for relation 28936 boundary_administrative Bergedorf !! Cannot resolve way member 26496646 for relation 28964 boundary_administrative Harburg (Hamburg) !! Node 323985058 of way 135078286 cannot be joined with any other way of the relation 1817154 Neuenkirchen WW Multipolygon relation 2136137 has conflicting types for outer boundary (place_island vs. boundary_administrative) !! Cannot resolve way member 162656856 for relation 2174826 landuse_forest

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• Tracking first visit date in Google Analytics

  - by dusan

  I want track a site's visitor retention using Google Analytics, to see if unregistered users are returning to it, within a time frame of 2+ months from now. This blog post seems to be on the right track, but I want to track unregistered users, so I don't have a "join date" or similar variable at my disposal. This other blog post suggests using all 5 GA custom variables, using the first variable slot on the first week, variable 2 on week 2, etc. This method will allow me to track 5 weeks of visitors. I want to track more than 5 weeks of visitors, so I was thinking on using two custom variables in GA: visitor's first visit date, and visitor's last visit date. How I can save the first visit date? Because if I save another value in the same slot the old value will be overwritten, and I don't know how reliable is to save that variable conditionally (reading the __utmv cookie to check whether the "first visit date" is set, if it isn't set I save the current date)

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• xrander problem with 1900x1080p

  - by Eslam

  i have a problem with xrandr i successfully executed the following : #cvt 1900 1080 #xrandr 1900x1080 170.75 1904 2024 2224 2544 1080 1083 1093 1120 -hsync +vsync but unfortunately the following command : #xrandr --addmode VGA-0 1900x1080 returned the following error : X Error of failed request: BadMatch (invalid parameter attributes) Major opcode of failed request: 153 (RANDR) Minor opcode of failed request: 18 (RRAddOutputMode) Serial number of failed request: 29 Current serial number in output stream: 30 the following command output might help in identifying problem : #glxinfo |grep -i opengl OpenGL vendor string: NVIDIA Corporation OpenGL renderer string: GeForce 310M/PCIe/SSE2 OpenGL version string: 3.3.0 NVIDIA 310.14 OpenGL shading language version string: 3.30 NVIDIA via Cg compiler OpenGL extensions: #lspci |grep -i vga 01:00.0 VGA compatible controller: NVIDIA Corporation GT218 [GeForce 310M] (rev a2) any ideas what's gonna be wrong ?

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• Are there any specific workflows or design patterns that are commonly used to create large functional programming applications?

  - by Andrew

  I have been exploring Clojure for a while now, although I haven't used it on any nontrivial projects. Basically, I have just been getting comfortable with the syntax and some of the idioms. Coming from an OOP background, with Clojure being the first functional language that I have looked very much into, I'm naturally not as comfortable with the functional way of doing things. That said, are there any specific workflows or design patterns that are common with creating large functional applications? I'd really like to start using functional programming "for real", but I'm afraid that with my current lack of expertise, it would result in an epic fail. The "Gang of Four" is such a standard for OO programmers, but is there anything similar that is more directed at the functional paradigm? Most of the resources that I have found have great programming nuggets, but they don't step back to give a broader, more architectural look.

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• Move Joomla website to new folder

  - by Jon

  I currently have a website. I have created a new folder on the website called V2. Under this folder I have installed Joomla and configured my new looking site. I now want to make V2 the default website. I could point the website to that V2 directory however I have other folders under the current root website that I need to keep. How can I transfer V2 to the root of my website? Is it just a case of copying all the files?

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• Applications: The Mathematics of Movement, Part 3

  - by TechTwaddle

  Previously: Part 1, Part 2 As promised in the previous post, this post will cover two variations of the marble move program. The first one, Infinite Move, keeps the marble moving towards the click point, rebounding it off the screen edges and changing its direction when the user clicks again. The second version, Finite Move, is the same as first except that the marble does not move forever. It moves towards the click point, rebounds off the screen edges and slowly comes to rest. The amount of time that it moves depends on the distance between the click point and marble. Infinite Move This case is simple (actually both cases are simple). In this case all we need is the direction information which is exactly what the unit vector stores. So when the user clicks, you calculate the unit vector towards the click point and then keep updating the marbles position like crazy. And, of course, there is no stop condition. There’s a little more additional code in the bounds checking conditions. Whenever the marble goes off the screen boundaries, we need to reverse its direction.  Here is the code for mouse up event and UpdatePosition() method, //stores the unit vector double unitX = 0, unitY = 0; double speed = 6; //speed times the unit vector double incrX = 0, incrY = 0; private void Form1_MouseUp(object sender, MouseEventArgs e) {     double x = e.X - marble1.x;     double y = e.Y - marble1.y;     //calculate distance between click point and current marble position     double lenSqrd = x * x + y * y;     double len = Math.Sqrt(lenSqrd);     //unit vector along the same direction (from marble towards click point)     unitX = x / len;     unitY = y / len;     timer1.Enabled = true; } private void UpdatePosition() {     //amount by which to increment marble position     incrX = speed * unitX;     incrY = speed * unitY;     marble1.x += incrX;     marble1.y += incrY;     //check for bounds     if ((int)marble1.x < MinX + marbleWidth / 2)     {         marble1.x = MinX + marbleWidth / 2;         unitX *= -1;     }     else if ((int)marble1.x > (MaxX - marbleWidth / 2))     {         marble1.x = MaxX - marbleWidth / 2;         unitX *= -1;     }     if ((int)marble1.y < MinY + marbleHeight / 2)     {         marble1.y = MinY + marbleHeight / 2;         unitY *= -1;     }     else if ((int)marble1.y > (MaxY - marbleHeight / 2))     {         marble1.y = MaxY - marbleHeight / 2;         unitY *= -1;     } } So whenever the user clicks we calculate the unit vector along that direction and also the amount by which the marble position needs to be incremented. The speed in this case is fixed at 6. You can experiment with different values. And under bounds checking, whenever the marble position goes out of bounds along the x or y direction we reverse the direction of the unit vector along that direction. Here’s a video of it running;   Finite Move The code for finite move is almost exactly same as that of Infinite Move, except for the difference that the speed is not fixed and there is an end condition, so the marble comes to rest after a while. Code follows, //unit vector along the direction of click point double unitX = 0, unitY = 0; //speed of the marble double speed = 0; private void Form1_MouseUp(object sender, MouseEventArgs e) {     double x = 0, y = 0;     double lengthSqrd = 0, length = 0;     x = e.X - marble1.x;     y = e.Y - marble1.y;     lengthSqrd = x * x + y * y;     //length in pixels (between click point and current marble pos)     length = Math.Sqrt(lengthSqrd);     //unit vector along the same direction as vector(x, y)     unitX = x / length;     unitY = y / length;     speed = length / 12;     timer1.Enabled = true; } private void UpdatePosition() {     marble1.x += speed * unitX;     marble1.y += speed * unitY;     //check for bounds     if ((int)marble1.x < MinX + marbleWidth / 2)     {         marble1.x = MinX + marbleWidth / 2;         unitX *= -1;     }     else if ((int)marble1.x > (MaxX - marbleWidth / 2))     {         marble1.x = MaxX - marbleWidth / 2;         unitX *= -1;     }     if ((int)marble1.y < MinY + marbleHeight / 2)     {         marble1.y = MinY + marbleHeight / 2;         unitY *= -1;     }     else if ((int)marble1.y > (MaxY - marbleHeight / 2))     {         marble1.y = MaxY - marbleHeight / 2;         unitY *= -1;     }     //reduce speed by 3% in every loop     speed = speed * 0.97f;     if ((int)speed <= 0)     {         timer1.Enabled = false;     } } So the only difference is that the speed is calculated as a function of length when the mouse up event occurs. Again, this can be experimented with. Bounds checking is same as before. In the update and draw cycle, we reduce the speed by 3% in every cycle. Since speed is calculated as a function of length, speed = length/12, the amount of time it takes speed to reach zero is directly proportional to length. Note that the speed is in ‘pixels per 40ms’ because the timeout value of the timer is 40ms.  The readability can be improved by representing speed in ‘pixels per second’. This would require you to add some more calculations to the code, which I leave out as an exercise. Here’s a video of this second version,

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• How do I get rid of this drive mount confirmation question when booting the computer?

  - by Dave M G

  With help from this site, I was able to set up an SSHFS connection between two computers on my LAN so that one auto mounts on the other at boot time. Everything works, but there is this annoying confirmation that comes up whenever I boot: An error occurred while mounting /home/dave/Mythbuntu. Press S to skip mounting or M or Manual recovery If I press S, then booting continues, and my drive is mounted as hoped, so it seems like even though I "skipped" it, maybe it tried again and succeeded later in the boot process. I followed the instructions here to set up "if up / if down" scripts, and here is my current /etc/fstab: sshfs#[email protected]:/home/mythbuntu /home/dave/Mythbuntu fuse auto,users,exec,uid=1000,gid=1000,allow_other,reconnect,transform_symlinks,BatchMode=yes 0 0 Although the mounting is working, this step of having to press S every time I boot is obviously kind of a hassle. How do I configure my computer so I don't have to do that, and so that my other computer will still automount?

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• Computer sending data while turned off

  - by Nicklas Ansman

  I have a some what strange problem (which could have and easy and obvious solution for all I know). My problem is that when I've booted ubuntu (now 10.4 but same problem with 9.10) and turns it off it starts sending a HUGE amount of data via the ethernet cable, so much in fact that my router can't handle it and stops responding. As far as I can tell the computer is completely turned off with no fans spinning. I can add that if I boot windows I do not have this problem, just when exiting ubuntu. There are two "fixes" for my problem: Pull the ethernet cable until the next boot Turn off power to the PSU and wait for the capacitors to unload Is there anyone who knows what could be going on? I'd be happy to post some logs or conf-files. Currently I'm using the ethernet port on my motherboard which is a Asus P6T Deluxe V2 with an updated version of the BIOS (maybe not the latest but since it only happens when I've been in ubuntu I don't wanna mess with the BIOS too much). Regards Nicklas ---------Update 1---------- The router is a D-Link DIR 655 with the latest firmware. ---------Update 2---------- I've now reinstalled ubuntu (with 10.4) and I still experience the same problem.

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• today's multi-device world for web development

  - by paul smith

  With the huge explosion of mobile devices and addition of HTML5/CSS3, there seems to be a shift towards "responsive" designs (i.e., adapting to smaller screen sizes) which seems to be achieved using CSS3's Media Queries. My question is, given the current need of adapting to both desktop and mobile, is it common practice to actually organize two versions of your website (one for desktop and one for mobile)? Or is there just one version with different css files for targeting different devices and screens? Handling just cross-browser (ie6, ff3, opera9, etc...) HTML4/5, CSS2/3 was already hard enough, but now we're expected to handle cross-device (phone, tablet, etc...) as well, so my assumption is company's would create a separate project for mobile and redirect based on the user agent, but this is just a guess.

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• Installer File Size Reduced

  The DevExpress DXperience installation file size will be about 1/2 size of its current 300+ megabytes! Starting with the v2010.1 installer, youll have less to download. How? The documentation files have been removed from the DXperience installer. However, a separate installer with just the documentation will be available for download. Search.DevExpress.Com FTW! Personally, I prefer to use the online documentation available at http://search.devexpress.com. Its fast and up to date! Look for...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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• squid bypass for a domain

  - by krisdigitx

  i am using squid with adzap, it possible that squid/adzap does not cache for a particluar domain eg. cnn.com this is my squid.conf file # # Recommended minimum configuration: # acl manager proto cache_object acl localhost src 127.0.0.1/32 #acl localhost src ::1/128 acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 #acl to_localhost dst ::1/128 # Example rule allowing access from your local networks. # Adapt to list your (internal) IP networks from where browsing # should be allowed acl localnet src 192.168.1.0/24 acl localnet src 192.168.2.0/24 acl SSL_ports port 443 acl Safe_ports port 80 # http acl Safe_ports port 21 # ftp acl Safe_ports port 443 # https acl Safe_ports port 70 # gopher acl Safe_ports port 210 # wais acl Safe_ports port 1025-65535 # unregistered ports acl Safe_ports port 280 # http-mgmt acl Safe_ports port 488 # gss-http acl Safe_ports port 591 # filemaker acl Safe_ports port 777 # multiling http acl CONNECT method CONNECT # # Recommended minimum Access Permission configuration: # # Only allow cachemgr access from localhost http_access allow manager localhost http_access deny manager # Deny requests to certain unsafe ports http_access deny !Safe_ports # Deny CONNECT to other than secure SSL ports http_access deny CONNECT !SSL_ports # We strongly recommend the following be uncommented to protect innocent # web applications running on the proxy server who think the only # one who can access services on "localhost" is a local user #http_access deny to_localhost # # INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS # # Example rule allowing access from your local networks. # Adapt localnet in the ACL section to list your (internal) IP networks # from where browsing should be allowed http_access allow localnet http_access allow localhost # And finally deny all other access to this proxy http_access deny all # Squid normally listens to port 3128 http_port xxx.xxx.xxx.yyy:3128 transparent visible_hostname proxyserver.local # We recommend you to use at least the following line. hierarchy_stoplist cgi-bin ? # Uncomment and adjust the following to add a disk cache directory. cache_dir ufs /var/spool/squid 1024 16 256 # Leave coredumps in the first cache dir coredump_dir /var/spool/squid # Add any of your own refresh_pattern entries above these. refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern -i (/cgi-bin/|\?) 0 0% 0 refresh_pattern . 0 20% 4320 access_log /var/log/squid/squid.log squid access_log syslog squid redirect_program /usr/local/adzap/scripts/wrapzap fixed using acl allow_domains dstdomain www.cnn.com always_direct allow allow_domains

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• Choosing the Right Financial Consolidation and Reporting Solution

  Financial reporting requirements for publicly-held companies are changing and getting more complex. With the upcoming convergence of US GAAP and IFRS, demand for more detailed non-financial disclosures, and the SEC mandate for XBRL financial executives are under pressure to ensure they have the right systems in place to support current and future reporting requirements. Tune into this conversation with Rich Clayton, VP of Enterprise Performance Management and BI products for Oracle, and Annette Melatti, Senior Director of Product Marketing for Financial Applications to learn about the latest market requirements, what capabilities are provided by Oracle's General Ledgers, and how customers can extend their investment in Oracle General Ledger solutions with Oracle's market-leading financial close and reporting products.

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• Printing in booklet fomat

  - by To Do

  In the past I had a printer that had the booklet format option that would print the document two pages at a time ordered in a way that folding the whole printout would produce a booklet which could be stapled in the middle. My current printer does not support this feature. I would like to use some utility or script to convert an A4 pdf to an A5 booklet one. I found this page but I'm getting an error : pdfjam ERROR: can't find pdflatex! How do I get past this issue? Does anybody know of any other solution? I'm on Ubuntu 12.10 AMD64

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• What is a proper way of building Winform apps with multiple "screens"

  - by CurtisHx

  What's a proper way of building a Winform app that has multiple 'screens'? For example, I'm trying to write a small backup program (mainly for giggles), and I've been dumping controls and containers onto the form. I'm using panels and group boxes to separate out the different screens (eg: I'm using a panel to hold all of the controls for the "Settings" window, and another panel to show all the current backups that have been set up). Well, my form.cs file ballooned into a massive amount of code, and I feel like I'm doing something wrong. I can hardly find anything in the file, and I'm ready to start over. This project was just for me to expand my knowledge of C# and .NET, so starting a new project is not a huge deal.

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• ksh Auto-Completion PuTTY Configuration

  - by Nitrodist

  I'm having a bit of a problem configuring my PuTTY client to work with the auto-completion feature in the ksh shell. I do a listing on the root with the directories /home and /homeroot and it returns the directories in a list just fine. I can't select it, though, by hitting X = (where X is the number). /home/nitrodist>ls /h #hits esc + = 1) home/ 2) homeroot/ #hits 2 + = for the 'homeroot' dir 1) home/ 2) homeroot/ #hits just the '=' key. 1) home/ 2) homeroot/ Any ideas? I've su -'d to another user who can actually do it with their PuTTY session and I can't do it there, which makes me think it's a PuTTY configuration issue. This is running on a ksh93 shell on HP-UX, if that makes any difference. Here's my ksh config: /home/campbelm>set -o Current option settings allexport off bgnice on emacs off errexit off gmacs off ignoreeof off interactive on keyword off markdirs off monitor on noexec off noclobber off noglob off nolog off notify off nounset off privileged off restricted off trackall off verbose off vi on viraw on xtrace off /home/campbelm>

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• The danger of changing the domain of your portfolio

  - by Mervin

  So I have a online portfolio that is available at mervin-ux-portfolio.com but I am planning to change hosts since the current host I am hosting it with is hitting me with a very high yearly renewal rate. When I was inquiring about domain transfers ,,they told me that since I had not initiated the domain transfer within 14 days of the expiry of the domain ,they cannot do it immediately and it would take about two weeks to to release the domain name. Since I dont like the idea of my site being down for like 2 weeks ,I was wondering if I should start afresh with a new domain on a new host and what were the potential dangers of that ( I have the entire site backup,so creating a replica of the site on the new host wont be hard) I also wont be losing any business or work since I work full time currently but I was just wondering about the challenges in terms of getting my domain name back to the top of search results and basically getting it out there assuming I go the new domain name approach. I know this is strictly not an UX question but I was hoping people could give some suggestions on what I should do

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• Penny auction concept and how the timer works

  - by madi

  I am creating a penny auction site using PHP yii framework. The main consideration of the system is to update the database records of all active auctions (max 15 auctions) with the current ticker timer. I am seeking for advice on how i should design the system where every auction item will have a its own countdown timer stored in the database and when someone bids the auction item, the counter resets to 2 min. Every users who are connected to the system should see the same countdown timer for that particular auction. I am little confused on how i should design the system. Will there be a performance issue when there are frequent updates to the database (Mysql) where 15 active auctions are updated every seconds, the countdown timer decreases by a second in the database table for the particular auction. Schema Sample for auction_lots: Auction_id,startdatetime,counter_timer,status I am seeking for advice on how I should design this. Please help. Thank you!

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• Is it normal for programmer to work on multiple projects simultaneously.

  - by gasan

  On a current job I have 2 projects to work on. First is very huge system and the second one is smaller but it also big (first project is being developed for 12 years, second for 4 years). At first I was working only on first project and was trying to get used to it. Then I was moved to second project and tried there, so my knowledge about first project became shady. Now I have to work on both projects at the same time. It's very hard for me because despite they both use java, they use different frameworks and the amount of code and business-logic to understand is very big so I really can't hold both that projects in my head. Is it normal and I should get used to it, although my expertise became very squashy, what won't happen if I would work only on a single project? Or should I raise a concern or maybe change employer?

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• Complete deployment to AWS

  - by Ionut

  I'm trying to deploy a Java Application to AWS free tier. I need the following: RDS provider. Using MySQL client S3 service. This is required for the Lucene Index and image uploading SES service. I need to be able to send emails to new registered users. Namecheap is my domain provider. EC2 instance Elastic Beanstalk instance. I managed to create an EC2 instance, upload the WAR file and link it to the Namecheap domain. However I find it difficult to link the other instances to the current application. I find the documentation a little messy and I can't find the right way to do this. Can you provide a simple walk through to deployment for this use case? Thanks!

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• Triple buffering causes input lag?

  - by user782220

  Consider some time in between two vsyncs. Suppose the first display buffer is being used to display the current image, and suppose the game was really fast and computed and rendered the next image to the second display buffer and the next one after that to the third display buffer. That is the rendering to the second and third display buffer happens so fast that it occurs before the next vsync. Suppose input from the user comes in now. What you would like is for the results of the input to show up on the next vsync or (probably more typical) the vsync after that. However, with the third display buffer already rendered the input can only effect the image after that. Meaning the input will only take effect at best 3 vsyncs later. I wish i had an image to show the exact timings of what I mean.

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• Manually updating HTML5 local storage?

  - by hustlerinc

  I'm just starting out HTML5 game developement (and game dev in general) and watching all the videos and tutorials available something has crossed my mind. Everyone keep saying I should set the cookie's (or cached files) to be expired after a certain amount of time. So that when it reaches that time the browser automatically downloads all assets again, even if it's the same asset's. Wouldn't it be possible to manually define the version of the game? For example the user has downloaded all the files for 1.01 of the game, when updating I change a simple variable to 1.02. When the user logs in it would compare his version to the current and if they are not equal only then it downloads the files? This could even be improved to download only specific files depending on what needs to be updated? Would this be possible or am I just dreaming? What are the possible downsides of this approach?

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• Tips for building an AI for a 2D racing game

  - by declique

  I have a school project to build an AI for a 2D racing game in which it will compete with several other AIs (no collision). We are given a black and white bitmap image of the racing track, we are allowed to choose basic stats for our car (handling, acceleration, max speed and brakes) after we receive the map. The AI connects to the game's server and gives to it several times a second numbers for the current acceleration and steering. The language I chose is C++, by the way. The questions are: What is the best strategy or algorithm (since I want to try and win)? I currently have in mind some ideas found on the net and one or two of my own, but I would like before I start to code that my perspective is one of the best. What good books are there on that matter? What sites should I refer to?

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