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• How can I improve overall system performance?

  - by Decio Lira

  What are your tips for improving overall system performance on ubuntu? Inspired by this question I realized that some default settings may be rather conservative on Ubuntu and that it's possible to tweak it with little or no risk if you wish to make it faster. This is not meant to be application specific (e.g. make firefox load pages faster), but system wide. Preferably 1 tip per answer, with enough detail for people to implement it. A couple of mine would be: Install Preload (via Software Center or sudo apt-get install preload); Change Swappiness value - "which controls the degree to which the kernel prefers to swap when it tries to free memory"; What are yours? PS: Since this is not intended to have a unique answer but rather, several useful tips, I'm making this community wiki out-of-the-box.

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• Python library for scripting (C++ integration)

  - by Edward83

  Please advise me good wrapper/library for python. I need to implement simple scripting in c++ app; Under "good" I mean pretty understandable, well documented, no memory leaking, fast. For creating base interface of GameObject on Python and C++; Your own experience and useful links will be nice!!! I found link about it, but I need more specific within gamedev context. What combinations of libraries you used for python integration into c++? For example about ogre-python it said built using Py++ and Boost.Python library And one more question, maybe someone of you know how Python was integrated into BigWorld engine (it's own port or some library)? Thank you!!!

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• unit testing variable state explicit tests in dynamically typed languages

  - by kris welsh

  I have heard that a desirable quality of unit tests is that they test for each scenario independently. I realised whilst writing tests today that when you compare a variable with another value in a statement like: assertEquals("foo", otherObject.stringFoo); You are really testing three things: The variable you are testing exists and is within scope. The variable you are testing is the expected type. The variable you are testing's value is what you expect it to be. Which to me raises the question of whether you should test for each of these implicitly so that a test fail would occur on the specific line that tests for that problem: assertTrue(stringFoo); assertTrue(stringFoo.typeOf() == "String"); assertEquals("foo", otherObject.stringFoo); For example if the variable was an integer instead of a string the test case failure would be on line 2 which would give you more feedback on what went wrong. Should you test for this kind of thing explicitly or am i overthinking this?

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• What can Haskell's type system do that Java's can't and vice versa?

  - by Matt Fenwick

  I was talking to a friend about the differences between the type systems of Haskell and Java. He asked me what Haskell's could do that Java's couldn't, and I realized that I didn't know. After thinking for a while, I came up with a very short list of minor differences. Not being heavy into type theory, I'm left wondering whether they're formally equivalent. To try and keep this from becoming a subjective question, I'm asking: what are the major, non-syntactical differences between their type systems? I realize some things are easier/harder in one than in the other, and I'm not interested in talking about those. And to make it more specific, let's ignore Haskell type extensions since there's so many out there that do all kinds of crazy/cool stuff.

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• How to make a disk image and restore from it later?

  - by Torben Gundtofte-Bruun

  I'm a new Linux user. I've reinstalled my Wubi from scratch at least ten times the last few weeks because while getting the system up and running (drivers, resolution, etc.) I've broken something (X, grub, unknowns) and I can't get it back to work. Especially for a newbie like me, it's easier (and much faster) to just reinstall the whole shebang than try to troubleshoot several layers of failed "fixing" attempts. Coming from Windows, I expect that there is some "disk image" utility that I can run to make a snapshot of my Linux install (and of the boot partition!!) before I meddle with stuff. Then, after I've foobar'ed my machine, I would somehow restore my machine back to that working snapshot. What's the Linux equivalent of Windows disk imagers like Acronis True Image or Norton Ghost? Note: I found a similar question here.

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• Software Design for Product Verticals and Service Verticals

  - by Rachel

  In every industry there are two verticals Product Vertical and Service Vertical, so my question is: How does design approach changes while designing Software for Product Vertical as compared to developing Software for Service Vertical ? What are the pros and cons for each case ? Also, in case of Product Vertical, How you go about designing Product or Features and what are steps involved ? Lastly, I was reading How Facebook Ships Code article and it appears that Product Managers have very little influence on how Product is developed and responsibility lies mainly with the Developer for the feature. So is this good practice and why one would go for this approach ? What would be your comment on this kind of approach ?

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• Best practice for storing HTML coming from text fields to a database?

  - by user1767270

  I have an application that allows users to edit certain parts of text and then email that out. My question is what is the best way to store this in a Microsoft SQL Server database. Right now I have two tables, one holding the HTML data and one holding the plain text data. When the user saves the info, it replaces newlines with br's and puts it in the HTML-conntaining table and then puts the regular text in the other table. This way the text box has the newlines when they go to edit, but the table that contains the HTML data, has the BR's. This seems like a silly way to do things. What would be the best practice? Thanks.

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• Share files - Ubuntu 12.4 and Windows 7 - one network - password not accepted

  - by gotqn

  I ask this question in SuperUser but no one helps me. I hope to get more attention here. I have three computers connected in one network by modem. I want to share files in this network in the most easy way (I have read about solutions using Samba). So, I have three machines: One with Windows 7 One with Windows XP One with Ubuntu 12.04 and I have the following situation: The windows PCs can share files between each other. The windows PCs can see that Ubuntu's one is in the network The PC with Ubuntu can see only the PC with Windows 7, but when I click on a folder it ask to enter the network password and it is not accepting it (I am 100% sure it's the correct one) Is there to fix this situation a little bit - at least to enable the file sharing between the Ubuntu and Windows 7 PCs or I should choose a different approach (please advice).

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• Palm Centro not even appearing on desktop

  - by DaimyoKirby

  Background: I'm trying to set up my dad's new installation of Xubuntu 12.10 (I finally got him to switch from Windows :-D) so he can sync his Palm Centro on his computer. I installed J-Pilot, but the problem is that his palm isn't even showing up anywhere on the computer. When it's plugged in, it lit up and began to charge when I told it to try and sync with the computer, but it failed the sync and Xubuntu still doesn't recognize it. Question: Does anyone know how I can get his Palm to be recognized by Xubuntu?

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• When is the best time to do self learning in relation with software management?

  - by shankbond

  It all started from here. I have been following Software Estimation: Demystifying the Black Art (Best Practices (Microsoft)). The third chapter says that in Software Management: You cannot give too much time to software developers, if you give it to them, then it is likely that extra time given to them will be filled by some other tasks (in other words, the developers will eat that time :)) Parkinson's Law You can also not squeeze the time from their schedule because if you do that, it is likely that they will develop poor quality product, poor design and will hurt you in the long run, there will be a panic situation and total chaos in the project, lots of rework etc. My question is related to the first point. If you don't give enough time then will the typical software engineer learn his/her skills? The market is always coming with new technologies, you need to learn them. Even with the existing familiar technologies there are always best practices and dos and don'ts.

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• Mobile Apps for Hospitals?

  - by Joey Green

  I currently work for a pretty large hospital and have been dabbling in iPhone development for a couple years. The CEO is wanting to get together a group to see what mobile technology we could create. I was contacted to be the main developer. I wanted to gather some ideas of what kind of mobile apps people have seen deployed in hospitals. Not necessarily medical apps that you can get on the app store, but rather apps built specifically for a hospital. Any ideas? If this is not the appropriate forum for a question like this, can someone point me to a forum where it would be appropriate?

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• Why don't more games use vector art?

  - by Parris

  It would seem to me that vector art is more efficient in terms of resources/scalability; however, in most cases I have seen artists using bitmap/rasterized art. Is this a limitation put on the artists by the game programmers/designers? As a programmer I think vector art would be more ideal, since it allows for scaling up resolution without having to recreate the art, creating really large graphics or causing graphics to become blurry. The questions: why aren't more people using SVG/AI to create 2D game art? Would it actually be preferred (and who prefers it)? Are bitmap graphics a standard or a limitation (or maybe neither)? Background: I am working on an engine, and I had some kinda cool ideas for vector based graphics; however, I don't want to piss off artists in the future. I guess this is more a question centered around pragmatism and developing games.

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• Is it necessary to read every single byte to check if a copied file is identical to the original?

  - by Koen027

  I recently learned of a program called Total Commander. It's a Windows Explorer replacement and has its own stuff to copy files. To check whether the files are identical, instead of calculation a CRC, it literally checks every single byte, one at a time, on both the original and the copy. My question is: Is this necessary? Can CRC or any other such technique go wrong? Should you, as a programmer, try and implement this perfect but slow system, or is it too extreme?

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• Shader inputs in a general purpose engine

  - by dreta

  I'm not familiar with SDKs like Unity or UDK that much, so i can't check this offhand. Do general purpose engines allow users to create custom uniform variables? The way i see it, and the way i have implemented it in an engine i'm writing to learn 3D, is that there is a "set" of uniforms provided by the engine and if you want to write a custom shader then you utilize uniforms you need to create a wanted effect. Now, the thing is, first of all i'm not an artist, second of all, i didn't have a chance to create complex scenes yet. So my question is, is it common practice to define variables that the engine provides and only allow the user to work with what they're given? Allowing users to add custom programs and use them where they want is not hard, but i have issues imagining how you'd go about doing the same for uniforms.

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• Starting off with web dev with php

  - by pavan kumar

  I'm currently working with Java / C++. I'm interested in web development and am planning to shift my stream. I heard that PHP is a good platform to start off and also it does not require that much of knowledge in technologies like JSP / Servlets or frameworks like springs / struts / hibernate. I have basic ideas about HTML and Javascript as well. I have gone through previous posts in SO and found out the relevant resources as well: http://net.tutsplus.com/tutorials/php/the-best-way-to-learn-php/ http://www.webhostingtalk.com/archive/index.php/t-1028265.html http://www.killerphp.com/ http://phpforms.net/tutorial/tutorial.html http://www.php5-tutorial.com/ etc. Now, my question is: I heard of PHP frameworks like CodeIgniter, Zend Frameworkd and Yii. Doesn't learning PHP & MySql implicitly makes us aware of these frameworks? Am I making a good choice in stating with PHP? Is it a good idea to shift streams?

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• Differences between fish and bash to pass commandline arguments to alias functions?

  - by NES

  From the answers to my other question here i learned about the possibility to pass commandline arguments to a alias function in Bash. In Fish i can edit an alias by editing the file config.fish in ~/.config/fish directory and adding a line like this alias lsp='ls -ah --color=always | less -R;' and it works perfectly. This should be the equivalent to editing ~/.bash_aliases in bash But when i try to setup an alias function to pass arguments like this alias lsp='_(){ ls -ah --color=always $* | less -R; }; _' it doesn't work for fish? Are there any differences between fish and bash in the way to setup an alias to pass commandline arguments that prevent this second alias from working with fish instead of bash?

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• Beta Testing iOS Application

  - by dbramhall

  I was wondering if it is advisable to get a small team of beta testers for an iOS application that will be released to the App Store. I am developing an iOS application and I have setup a beta application form however I was wondering if it is advisable to even do beta testing considering I am actively testing and using my application on all of my own iOS devices (iPad 2, 2 iPod Touches and an iPhone 4 (plus, of course iOS Simulator)) - all running various versions of iOS 4. My question is: would you advise someone to get beta testers for an iOS application and, if so, how would you advise them to go about getting testers. For those interested, my application is at http://affogato.visioa.com/

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• scritp to create automatically ext4 and swap in unallocated diskspace

  - by user285589

  i've to install a number of machines. Some machines have windows 7 installed. Some machines not. The machines have 0 or 2 or 3 partitions. Every machine has enough free diskspace (20 to 250 GB) I installed an "golden client" and build an tar archiv of this client. Now, every client boots up a small linux via pxe, and run a script. This script should create a ext4 and a swap partition using the whole free space. After this, mount the ext4-partition, copy tar, chroot, and so on. The problem still is: I can create partitions using fdisk. But how can i figure out the partion number of the new partition. Do i have to mount /dev/sda3 or /dev/sda1? Someone an idea? Further question: How can i figure out, if the is unallocated space, and how much it is? Thanks

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• Beginners' Guide to Development

  - by Bombillazo

  Hello. So I have some experience programming in Java, and at the moment I am learning how to use Python. I have read on the process of game design and such. I also have media covered, got experience with graphics and audio. My question is geared more towards the actual tools to use for making games, developing. I am willing to commit to a long term development cycle, as I will be doing this as a hobby. I've heard of Flash, Gamemaker, etc. I don't intend to create my own Game Engine, so I was looking for a platform that is extensible and easy to program with an OOP mind frame. As a plus it would be great of said game could be played directly from a website. TIA!

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• Turn-based Strategy Loop

  - by Djentleman

  I'm working on a strategy game. It's turn-based and card-based (think Dominion-style), done in a client, with eventual AI in the works. I've already implemented almost all of the game logic (methods for calculations and suchlike) and I'm starting to work on the actual game loop. What is the "best" way to implement a game loop in such a game? Should I use a simple "while gameActive" loop that keeps running until gameActive is False, with sections that wait for player input? Or should it be managed through the UI with player actions determining what happens and when? Any help is appreciated. I'm doing it in Python (for now at least) to get my Python skills up a bit, although the language shouldn't matter for this question.

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• Recover partition after GParted resizing interrupted by unexpected shutdown

  - by user84207

  As I was resizing my partitions using GParted, my laptop battery ran out, and the process was interrupted. Now, I am unable to mount the partition which I was trying to resize. I get the following error when I click to mount the partition on nautilus: Error mounting: mount: wrong fs type, bad option, bad superblock on /dev/sda3, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so How can I go about recovering my data? Is there a safe way to attempt to force-mount the partition in question? Any help towards recovering my data is sincerely appreciated.

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• Maya 6 vs Maya 2013

  - by DiscreteGenius

  I have the entire "Learning Maya 6" books that I purchased back when Maya 6/6.5 was the hottest thing. I read some of the books but never finished the series. I don't know much about Maya or the field. I want to get back into the field but I have a concern. My question: Would I be failing if I decided to use my old Maya 6 books and Maya 6.5 software? As opposed to ditching my old books and starting with Maya 2013 and online tutorials, videos, etc.?

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• What should we tell our unsupported IE6 users?

  - by Dan Fabulich

  In the upcoming version of our web app, we've broken IE6, and we don't intend to fix it. We've had a clear warning posted for IE6 users for some months; we've decided it's time not to support it. My question is: how should we communicate this to our users? Some people here feel that we should block IE6 users who would try to access the web app, because it's not going to work for them. Others feel that we should just leave up a warning, saying "This doesn't work in IE6," but not block them; instead, if they click to dismiss the warning, just let them in to the broken site to see for themselves that it doesn't work. Who is right? Is there a better way?

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• Performance: recursion vs. iteration in Javascript

  - by mastazi

  I have read recently some articles (e.g. http://dailyjs.com/2012/09/14/functional-programming/) about the functional aspects of Javascript and the relationship between Scheme and Javascript (the latter was influenced by the first, which is a functional language, while the O-O aspects are inherited from Self which is a prototyping-based language). However my question is more specific: I was wondering if there are metrics about the performance of recursion vs. iteration in Javascript. I know that in some languages (where by design iteration performs better) the difference is minimal because the interpreter / compiler converts recursion into iteration, however I guess that probably this is not the case of Javascript since it is, at least partially, a functional language.

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• Getting overwhelmed after starting a new project

  - by Kian Mayne

  I started a project (a Windows based timetable program that helps you stay organised with your subjects and assignments). The problem is that I'm not sure how I should manage this project and what order to build things. I.e. Should I build all the different interface elements then write the code or should I make an interface, code it, make another interface then code that? So my question is; how do I split up this longish project into small, ordered pieces to complete; and how should I order this?

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