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• Load balancing without a load balancer?

  - by Tom

  I have 4 nginx-powered image servers on their own subdomains which users would access at random. I decided to put them all behind a HAProxy load balancer to improve the reliability and to see the traffic statistics from a single location. It seemed like a no-brainer. Unfortunately, the move was a complete failure as the load balancer's 100mbit port was completely saturated with all requests now going through it. I was wondering what to do about this - I could get a port upgrade ($$) or return to 4 separate image servers that are randomly accessed. I thought about putting HAProxy on each image server which would in turn route to another image server if that server's nginx service was having trouble. What would you do? I would like to not have to spend too much additional money.

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• Are there any concrete examples of where a paralellizing compiler would provide a value-adding benefit?

  - by jamie

  Paul Graham argues that: It would be great if a startup could give us something of the old Moore's Law back, by writing software that could make a large number of CPUs look to the developer like one very fast CPU. ... The most ambitious is to try to do it automatically: to write a compiler that will parallelize our code for us. There's a name for this compiler, the sufficiently smart compiler, and it is a byword for impossibility. But is it really impossible? Can someone provide a concrete example where a paralellizing compiler would solve a pain point? Web-apps don't appear to be a problem: just run a bunch of Node processes. Real-time raytracing isn't a problem: the programmers are writing multi-threaded, SIMD assembly language quite happily (indeed, some might complain if we make it easier!). The holy grail is to be able to accelerate any program, be it MySQL, Garage Band, or Quicken. I'm looking for a middle ground: is there a real-world problem that you have experienced where a "smart-enough" compiler would have provided a real benefit, i.e that someone would pay for? A good answer is one where there is a process where the computer runs at 100% CPU on a single core for a painful period of time. That time might be 10 seconds, if the task is meant to be quick. It might be 500ms if the task is meant to be interactive. It might be 10 hours. Please describe such a problem. Really, that's all I'm looking for: candidate areas for further investigation. (Hence, raytracing is off the list because all the low-hanging fruit have been feasted upon.) I am not interested in why it cannot be done. There are a million people willing to point to the sound reasons why it cannot be done. Such answers are not useful.

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• make quantaplus a default editor for php files in ubuntu

  - by diEcho

  In Ubuntu, how can I make Quanta Plus the default editor for PHP files? In Windows we just use the open with context menu the first time for any new types of files and check use this application for these type of files. After that the files always open up in checked application. I want to know if Ubuntu has a similar feature. Also, if I open 2 PHP files then two instance of Quanta Plus opens up. How can I get the secondary PHP files to open on another tab instead?

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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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• Cannot connect to internet by Internet Explorer

  - by user428368

  I was using Mozilla Firefox for browsing and it workes Ok. But now when I want to open any web site by using IE8 it says Internet Explorer cannot display the webpage (and Mozilla still works). I came to this problem because I wanted to install Google Earth, but it says that the program cannot access the server .... so Google sugested me to open one of three links in IE .... and it doesn't work. By the way I'm connected to Internet via LAN, but in IE, Internet Options, Connections there is nothing, not a single conection. People, please help....

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• Using SQL tables for storing user created level stats. Is there a better way?

  - by Ivan

  I am developing a racing game in which players can create their own tracks and upload them to a server. Players will be able to compare their best track times to their friends and see world records. I was going to generate a table for each track submitted to store the best times of each player who plays the track. However, I can't predict how many will be uploaded and I imagine too many tables might cause problems, or is this a valid method? I considered saving each player's best times in a string in a single table field like so: level1:00.45;level2:00.43;level3:00.12 If I did this I wouldn't need a separate table for each level (each level could just have a row in a 'WorldRecords' table). However, this just causes another problem because the text would eventually reach the limit for varchar length. I also considered storing the times data in XML files. This would avoid database issues and server disk space can be increased if needed. But I imagine this would be very slow. To update one players best time on one level, I would have to check every node in the file to find their time record to update. Apologies for the wall of text. Any suggestions would be appreciated.

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• Where are ghostscript options / switches documented?

  - by sdaau

  I know there is a Ghostscript option, for instance -dPDFSETTINGS=/screen - where is that documented? How can I see what other options it accepts, appart from screen? Also, -dMaxSubsetPct=100 - what does it do? I open man gs, search for PDFSET, I get "Pattern not found". I type in a search engine, I get a myriad of personal webpages, no documentation hits. Can anyone help with a link? Many thanks in advance, Cheers! EDIT: also see this related post: Querying Ghostscript for the default options/settings of an output device (such as 'pdfwrite' or 'tiffg4') - Stack Overflow ... for getting a list of supported options for a given device.

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• Synaptics drivers are not loading on Kubuntu 13.10 on Dell Vostro 2420

  - by Alok Singh Mahor

  I freshly installed Kubuntu 13.10, 32 bit version on newly purchased Dell Vostro 2420. everything is working fine except scrolling and multitouch features through touchpad. I am able to change position of cursor using touchpad and able to tap (single click and double click) but scrolling is not working I tried to find out solution by searching on google but could not find proper solution to load synaptics drivers. i am listing some details: Laptop: Dell Vostro 2420 Linux Kernel version and distribution: 3.11.0-12-generic, Kubuntu 13.10 output of xinput list is ? Virtual core pointer id=2 [master pointer (3)] ? ? Virtual core XTEST pointer id=4 [slave pointer (2)] ? ? PS/2 Generic Mouse id=12 [slave pointer (2)] ? Virtual core keyboard id=3 [master keyboard (2)] ? Virtual core XTEST keyboard id=5 [slave keyboard (3)] ? Power Button id=6 [slave keyboard (3)] ? Video Bus id=7 [slave keyboard (3)] ? Power Button id=8 [slave keyboard (3)] ? Sleep Button id=9 [slave keyboard (3)] ? Laptop_Integrated_Webcam_HD id=10 [slave keyboard (3)] ? AT Translated Set 2 keyboard id=11 [slave keyboard (3)] ? Dell WMI hotkeys id=13 [slave keyboard (3)] Output of synclient -l is Couldn't find synaptics properties. No synaptics driver loaded? output of lshw is at http://paste.ubuntu.com/6645687/ xserver log and dmesg dont have trace of synaptics kindly tell me how to troubleshoot this problem.

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• XNA 4.0, Combining model draw calls

  - by MayContainNuts

  I have the following problem: The levels in my game are made up of a Large Quantity of small Models and because of that I am experiencing frame rate problems. I already did some research and came to the conclusion that the amount of draw calls I am making must be the root of my problems. I've looked around for a while now and couldn't quite find a satisfying solution. I can't cull any of those models, in a worst case scenario there could be 1000 of them visible at the same time. I also looked at Hardware geometry Instancing, but I don't think that's quite what I'm looking for, because the level consists of a lot of different parts. So, what I'd like to do is combining 100 or 200 of these Models into a single large one and draw it as a whole 'chunk'. The whole geometry is static so it wouldn't have to be changed after combining, but different parts of it would have to use different textures (I think I can accomplish that with a texture atlas). But I have no idea how to to that, so does anybody have any suggestions?

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• Excel - Avoid cell text to be shown onto next empty cell

  - by e-mre

  When you have text in an Excel cell that is too long to be shown in the visible area of a single cell and the cell next to the first cell (the one on the right) is empty, Excel lets the text to be printed onto the next cell. This is what I want to change. I want to avoid this text overflow. I know I can avoid this by enabling "word wrap" and adjusting row height. But that is not what I want. I want to change the DEFAULT behavior of Excel so it shows the value of each cell only in the visible area of that cell. No overflow, no word wrap. Is this possible? (I am using Excel 2010 by the way)

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• OpenOffice Calc: How can I count the number of different items with data pilot?

  - by manu

  Hi all, I have a rather long spreadsheet with historical information of issues solved by some user on a colaborative environment. The spreadsheet have the following (relevant) columns date, week no., project, author id, etc... The week no. is calculated from the date, is basically the year concatenated with the week number within that year; for instance, both 2009-02-18 and 2009-02-20 yield the week number 200908 - the 8th week of year 2009; and 2009-02-23 yields 200909 - the 9th week of year 2009. I need to count how many different users (given by author id) contributed to some project, on a weekly basis. I have setup a data pilot with the week as Row Field, the project as the Column Field, and count-author as the Data Field. However, this counts the author id as different instances. This is not what I need. I need to count how many different users contributed to each project on a weekly basis. I expect to get something like: projects week Project1 Project2 Project3 200901 10 2 200902 2 7 Each inner cell containing how many different users contributed. With the count-author configuration, what I get is how many contributions (total) got the project on that week. Is there a way to tell OpenOffice Calc to do what I want?

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• What's the proper term for a function inverse to a constructor? Deconstructor, destructor, or something else?

  - by Petr Pudlák

  Edit: I'm rephrasing the question a bit. Apparently I caused some confusion because I didn't realize that the term destructor is used in OOP for something quite different - it's a function invoked when an object is being destroyed. In functional programming we (try to) avoid mutable state so there is no such equivalent to it. (I added the proper tag to the question.) Instead, I've seen that the record field for unwrapping a value (especially for single-valued data types such as newtypes) is sometimes called destructor or perhaps deconstructor. For example, let's have (in Haskell): newtype Wrap = Wrap { unwrap :: Int } Here Wrap is the constructor and unwrap is what? I've seen both, for example: ... Most often, one supplies smart constructors and destructors for these to ease working with them. ... at Haskell wiki, or ... The general theme here is to fuse constructor - deconstructor pairs like ... at Haskell wikibook (here it's probably meant in a bit more general sense). The questions are: How do we call unwrap in functional programming? Deconstructor? Destructor? Or by some other term? And to clarify, is this terminology applicable to other functional languages, or is it used just in the Has

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• HP Smart Array; Is it possible to convert Raid1 to Raid0 by dropping a failed drive?

  - by Erik Heppler

  I have a server that was running two 60GB drives as a logical RAID1. At some point the second drive was physically removed and the logical drive has been in "Interim Recovery Mode" for several months now. There's no need for the redundancy of RAID1 on this machine, and I have no intention of replacing the missing drive. If possible I would like to convert the current RAID1 to a single-drive RAID0 by simply dropping the failed drive from the current configuration. I'm only interested in doing this if it can be done in-place. Otherwise I'm perfectly content to leave it in "Interim Recovery Mode" indefinitely.

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• Simplest way to render image over top of another with another image used as mask in OpenGL?

  - by Adam Naylor

  The effect I'm looking for is to have a single large background image that is always visible (at full alpha) and then show a second image (what I call a light map or specular map) that is partially shown over the top based on a third image (which is effectively a mask). The effect is similar to this effect except instead of simply darkening or lightening the background image using the third image it needs to mask the second without effecting the first at all. The third image is the only one that moves therefore hard baking the third images alpha into the second image isn't an option. If my explanation isn't clear I'll provide visual examples when I have more time. I'd prefer not to go down a shader route as I haven't taught myself this area yet so unless I have too I'd rather try to achieve this with simple alpha blending. Happy to use a shader approach. Cheers. Additional These third images are obviously light sources being cast onto the first image showing the specular information from the second image to simulate the light 'shining' off the objects in the first image. The solution I implement will need to allow two light sources to potentially overlap so my current thoughts are that the alpha values of the two images will need to be combined (Added?) to produce a final image which masks the second image? Don't worry about things like coloured lights. For this technique the lights are all considered white.

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• Scheduled task based on Microsoft patch release cycle

  - by floyd

  I have a simple powershell script which unapproves all patches based on computer group name in WSUS which works great. All of our servers patch on a specific Day/Week/Time starting on Week0-Wednesday which would be the Wednesday after Microsoft Patch Tuesday (2nd Tuesday of every month) all the way to Week3-Sunday. This obviously causes problems as sometimes not all patches get applied in one reboot cycle, and then will install patches the following week during their group policy scheduled patching day/time which is what I'm trying to prevent. My question is I'm trying to schedule my script to run based on this schedule and I am finding it next to impossible using Windows Task Scheduler. For instance if I wanted something to always run on the 4th Monday after Microsoft Patch Tuesday, I cant always use the task scheduler option "4th Monday of the Month" Has anyone run into a similar situation, or know of any task scheduling tools which give you more flexibility than Windows Task Scheduler?

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• Need help completing this Powershell script with some Exchange 2010 commands.

  - by Pure.Krome

  Hi folks. the following powershell script lists all the email aliases I have for a single mailbox. >$mbx = Get-Mailbox myuser >$mbx.EmailAddresses and that lists all the addresses. eg. SmtpAddress : [email protected] AddressString : [email protected] ProxyAddressString : smtp:[email protected] Prefix : SMTP IsPrimaryAddress : False PrefixString : smtp SmtpAddress : [email protected] AddressString : [email protected] ProxyAddressString : smtp:[email protected] Prefix : SMTP IsPrimaryAddress : False PrefixString : smtp SmtpAddress : [email protected] AddressString : [email protected] ProxyAddressString : SMTP:[email protected] Prefix : SMTP IsPrimaryAddress : True PrefixString : SMTP Now to add a new email address, I do the following poweshell command :- $mbx.EmailAddresses += "myEmailAddress.com" $mbx | Set-Mailbox So i'm not sure how i can use the foreach to remove each address? I tried:- @mbx.EmailAddresses | foreach { $mbx.EmailAddresses -= $._SmtpAddress } and that failed miserably. That's my first attempt of PS script, ever :P Can anyone help?

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• Remote Debugging

  - by Pemdas

  Obviously, the easiest way to solve a bug is to be able to reproduce it in house. However, sometimes that is not practical. For starters, users are often not very good at providing you with useful information. Costumer Service: "what seems to be the issue?" User: "It crashed!" To further compound that, sometimes the bug only occurs under certain environmentally conditions that can not be adequately replicated in house. With that in mind, it is important to build some sort of diagnostic framework into your product. What type of solutions have you seen or used in your experience? Logging seems to be the predominate method, which makes sense. We have a fairly sophisticated logging frame work in place with different levels of verbosity and the ability to filter on specific modules (actually we can filter down to the granularity of a single file). Error logs are placed strategically to manufacture a pretty good representation of a stack trace when an error occurs. We don't have the luxury of 10 million terabytes of disk space since I work on embedded platforms, so we have two ways of getting them off the system: a serial port and a syslog server. However, an issue we run into sometimes is actually getting the user to turn the logs on. Our current framework often requires some user interaction.

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• Full Backup & Restore for Windows Vista

  - by Thomas Matthews

  I'm looking for a freeware or low cost application that will backup everything, including registry on Windows Vista Home Premium and to restore from a CDROM disk. The destination is an external hard drive on USB 2.0. Searching on SuperUser and Stack Overflow show articles, but don't mention full backup of the registry and complete restore using CDROM. I would also like to have compressed output and incremental backups. One article mentions CloneZilla, but their web page says that the incremental feature is not supported. I am using Windows Vista Home Premium, Service Pack 1. I need to backup 200 GB onto a 230 GB drive and would like to have multiple backups (thus the need for compression). Other requirements: Single file restore Quality is more important than performance. Application must run on Windows Vista. Extra: Run as daemon or background task on 4 user system. Thanks

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• How to monitor a folder for changes, and execute a command if it does, on Windows?

  - by Camilo Martin

  There are similar questions for Linux and Mac, but I'm after a Windows solution here. The problem is as follows: I want to write several (js) script files in a folder, and have a program monitor that folder for file changes and new files being added, and run a command whenever that happens (to compile them all into one single file). The solution has to: Monitor both file changes and new files being added, in a folder. Run a command only if there is any change. It would be best if it either is a built-in solution (like a JScript or VBscript snippet), or something that does not require installation.

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• Disabling the command enter shortcut on Mac Entourage.

  - by Bruce

  It seems like disabling a shortcut should not be such a big deal, but I cannot seem to be able to do it for any shortcuts and specifically not for the combination that I keep hitting by mistake, every single day. The smaller space bar makes it very easy to hit the command key by mistake, and the return is a commonly used key when typing. I keep sending important e-mails before I am done typing, or worse, before I am done editing. I do not necessarily want to disable all the shortcuts, but that one for sure. The choices for changing anything in Entourage seem very limited. [Entourage for Mac 2008. Version 12.2.8. (101117) ESD] It is easy enough just to hit "send." This short cut causes a lot more trouble than it saves. Help.

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• SCP command Clarification

  - by david.colais

  I'm using the scp commands to pull some files from the remote server and one variation of the command is not working. I have 2 files names one.xml and two.xml in a remote server and I'm pulling these two files into the current dir using the following command: scp [email protected]:/student/class/Intermediate/one.xml . scp [email protected]:/student/class/Intermediate/two.xml . The above command works fine but if I use wildcards to pull all the xml files in a single shot as shown below it returns scp: No match. scp [email protected]:/student/class/Intermediate/*.xml . Why is it working if I pull the files individually and not working if I try to pull using wildcards.

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• Another good free utility - Campwood Software Source Monitor

  - by TATWORTH

  The Campwoood Source Monitor at http://www.campwoodsw.com/sourcemonitor.html  says in its introduction "The freeware program SourceMonitor lets you see inside your software source code to find out how much code you have and to identify the relative complexity of your modules. For example, you can use SourceMonitor to identify the code that is most likely to contain defects and thus warrants formal review. SourceMonitor, written in C++, runs through your code at high speed, typically at least 10,000 lines of code per second." It is indeed very high-speed and is useful as it: Collects metrics in a fast, single pass through source files. Measures metrics for source code written in C++, C, C#, VB.NET, Java, Delphi, Visual Basic (VB6) or HTML. Includes method and function level metrics for C++, C, C#, VB.NET, Java, and Delphi. Offers Modified Complexity metric option. Saves metrics in checkpoints for comparison during software development projects. Displays and prints metrics in tables and charts, including Kiviat diagrams. Operates within a standard Windows GUI or inside your scripts using XML command files. Exports metrics to XML or CSV (comma-separated-value) files for further processing with other tools.

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• Why won't Mail sync To Do/Tasks with Exchange?

  - by cebjyre

  I'm using Apple Mail (Snow Leopard, everything is fully up-to-date), and am happily using an Exchange 2007 server for email needs, but I can't get it to synchronise the To Do notes from Mail with the Tasks from Exchange. I've tried creating a task in each and neither of them went to the other side. Bizarrely I have a single task from before I actually upgraded to Snow Leopard that did get into Mail from Exchange. Right-clicking on the Inbox and hitting 'Get Account Info' in Mail reports the correct number of entries in the 'To Do' folder for 'Messages on Server'.

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• phpredis + pconnect

  - by john smith

  I am using phpredis on my php based website. The webserver I am using is a the simplest apache apt-get installation, no configuration involved, as this is only a development environment. The issue I am facing is that basically, while using phpredis, there is no difference between "connect" and "pconnect" commands: they both create a new connection everytime, as I can see from the "info" command on redis-cli. Now, I am pretty sure it is because of the apache configuration and the fact that it probably (most likely) is a multi-threaded env, therefore can't enstablish a single connection. My question is basically for when I will turn into production: what would the best choice of a webserver be to avoid this problem? I remember using lighttpd with thousands of users and still get only a very few (like 2 or 3) connections on mongoDB. Any ideas? Thanks in advance.

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• Installing httpssl module on a running NGINX server

  - by Rob

  Hi, New to NGINX, we inherited a project that runs Django/FCGI/NGINX on a hosted RHEL box. A requirement has come in that the site now needs to have ssl enabled. Client was pretty sure the person who had built the site had made it so they could use ssl. I backed up the conf file, added the server block for the ssl instance and tried to reload. Reload failed because it didn't recognize the ssl in this line: ssl on; Not an NGINX expert, but the David Caruso in me tells me that the server (sunglasses on) is not secure. I know that you need to configure NGINX at install with this module. If this didn't happen, how hard/risky is it to reconfigure a running nginx box with this module given that we didn't configure it in the first place.

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