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• Optimum number of threads while multitasking

  - by Gun Deniz

  I know similar questions have been asked but I think my case is a little bit diffrent. Let's say I have a computer with 8 cores and infinite memory with a Linux OS. I have a calculation software called Gaussian that can take advantage of multithreading. So I set its thread count to 8 for a single calculation for maximum speed. However I really can't decide what to do when I need to do run for instance 8 calculations simultaneously. In that case should I set the thread count to 1(total 8 threads spawned in 8 processes) or keep it 8(total 64 threads spawned in 8 processes) for each job? Does it really matter much? A related question is does the OS automatically does the core-parking to diffrent cores for each thread?

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• What kind of SATA interface is on a Thinkpad X120E?

  - by Jorge Castro

  I recently ordered a Thinkpad X120E with an AMD Fusion (Zacate) chipset. I am eyeballing an SSD for it, however newer SSDs are coming out with 6Gbps SATA interfaces. I doubt such a cheap laptop has 6Gbps SATA, but I'm debating waiting the a bit longer until the Intel 510 series come out, if anything to future proof myself by putting it in this laptop and then later on when I do upgrade to a laptop with 6Gbps SATA I'll be good to go. The hardware manual mentions that the motherboard is for a "AMD Fusion E-350" but the specifications of each hardware part isn't part of the manual. Does anyone have any information on the kind of SATA controllers in Fusion laptops so I can make a better purchasing decision?

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• What is causing these visual artifacts on my OpenGL sprites?

  - by Amplify91

  What could be the cause of the defects in my characters sprite? I am using OpenGL ES 2.0. I draw my sprites in a sprite batch that uses UV coordinates from one large texture atlas. If you look around the character' edges, you'll see two noticeable problems: The invisible alpha background is not invisible, but shows a strange static-like background. There are unwanted streaks where the character nears the edge of the frame (but only in some frames of the animation, this happened to be one of them). Any idea what could be causing these? I will provide related code if asked for, but I'll try to avoid just dumping the entire project and expecting someone to look through it all. EDIT: Here's a bit of code: This is how I generate my UV coordinates: private float[] createFrameUV(int frameWidth, int frameHeight, int x, int y){ float[] uv = new float[4]; if(numberOfFrames>1){ float width = (float)frameWidth / (float)mBitmap.getWidth(); float height = (float)frameHeight / (float)mBitmap.getHeight(); float u = (float)x / (float)mBitmap.getWidth(); float v = (float)y / (float)mBitmap.getHeight(); uv[0] = u; uv[1] = v; uv[2] = u + width; uv[3] = v + height; }else{ uv[0] = 0f; uv[1] = 0f; uv[2] = 1f; uv[3] = 1f; } return uv; } These are some OpenGL settings: GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR); GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR); GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE); GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);

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• Implementing Circle Physics in Java

  - by Shijima

  I am working on a simple physics based game where 2 balls bounce off each other. I am following a tutorial, 2-Dimensional Elastic Collisions Without Trigonometry, for the collision reactions. I am using Vector2 from the LIBGDX library to handle vectors. I am a bit confused on how to implement step 6 in Java from the tutorial. Below is my current code, please note that the code strictly follows the tutorial and there are redundant pieces of code which I plan to refactor later. Note: refrences to this refer to ball 1, and ball refers to ball 2. /* * Step 1 * * Find the Normal, Unit Normal and Unit Tangential vectors */ Vector2 n = new Vector2(this.position[0] - ball.position[0], this.position[1] - ball.position[1]); Vector2 un = n.normalize(); Vector2 ut = new Vector2(-un.y, un.x); /* * Step 2 * * Create the initial (before collision) velocity vectors */ Vector2 v1 = this.velocity; Vector2 v2 = ball.velocity; /* * Step 3 * * Resolve the velocity vectors into normal and tangential components */ float v1n = un.dot(v1); float v1t = ut.dot(v1); float v2n = un.dot(v2); float v2t = ut.dot(v2); /* * Step 4 * * Find the new tangential Velocities after collision */ float v1tPrime = v1t; float v2tPrime = v2t; /* * Step 5 * * Find the new normal velocities */ float v1nPrime = v1n * (this.mass - ball.mass) + (2 * ball.mass * v2n) / (this.mass + ball.mass); float v2nPrime = v2n * (ball.mass - this.mass) + (2 * this.mass * v1n) / (this.mass + ball.mass); /* * Step 6 * * Convert the scalar normal and tangential velocities into vectors??? */

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• How to create a copy of an instance without having access to private variables

  - by Jamie

  Im having a bit of a problem. Let me show you the code first: public class Direction { private CircularList xSpeed, zSpeed; private int[] dirSquare = {-1, 0, 1, 0}; public Direction(int xSpeed, int zSpeed){ this.xSpeed = new CircularList(dirSquare, xSpeed); this.zSpeed = new CircularList(dirSquare, zSpeed); } public Direction(Point dirs){ this(dirs.x, dirs.y); } public void shiftLeft(){ xSpeed.shiftLeft(); zSpeed.shiftRight(); } public void shiftRight(){ xSpeed.shiftRight(); zSpeed.shiftLeft(); } public int getXSpeed(){ return this.xSpeed.currentValue(); } public int getZSpeed(){ return this.zSpeed.currentValue(); } } Now lets say i have an instance of Direction: Direction dir = new Direction(0, 0); As you can see in the code of Direction, the arguments fed to the constructor, are passed directly to some other class. One cannot be sure if they stay the same because methods shiftRight() and shiftLeft could have been called, which changes thos numbers. My question is, how do i create a completely new instance of Direction, that is basically copy(not by reference) of dir? The only way i see it, is to create public methods in both CircularList(i can post the code of this class, but its not relevant) and Direction that return the variables needed to create a copy of the instance, but this solution seems really dirty since those numbers are not supposed to be touched after beeing fed to the constructor, and therefore they are private.

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• how to install Mysql & tomcat on mac os x 10.5.8

  - by Divya Jyothi

  Hi can some one provide me how to install both om my mac osx 10.5.8 Hi can some one provide me how to install both om my mac osx 10.5.8 Ok this what I have done Downloaded MySQL version 5.5.22.dmg for Mac OS X 10.5 (x86, 64-bit) from http://dev.mysql.com/downloads/mysql/ Installed three files from it after mounting.... 1.MySQL -version.pkg installed it by double clicking on it 2.mysqlstartupitem.pkg installed it 3. MySql.prefpane - after installing it says it doesn't work on intel based Mac After that I have no idea whati need to start Regarding tomcat JAVA_HOME WAS the problem;(

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• Windows 7: "localhost name resolution is handled within DNS itself". Why?

  - by Portman

  After 18 years of hosts files on Windows, I was surprised to see this in Windows 7 build 7100: # localhost name resolution is handled within DNS itself. # 127.0.0.1 localhost # ::1 localhost Does anyone know why this change was introduced? I'm sure there has to be some kind reasoning. And, perhaps more relevantly, are there any other important DNS-related changes in Windows 7? It scares me a little bit to think that something as fundamental as localhost name resolution has changed... makes me think there are other subtle but important changes to the DNS stack in Win7.

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• What are some general guidelines for setting up an iOS project I will want to personally publish but sell in the future?

  - by RLH

  I have an idea for a personal iOS project that I would like to write and release to the iOS store. I'm the type of developer who enjoys developing and publishing. I want to write quality software and take care of my customers. Assuming that I wrote an application that had reasonable success, there is a fair chance that I would want to sell the ownership rights of the app to another party and I'd use the proceeds to develop my next personal project which, in turn, I'd probably want to sell in the future. With that said, what are some general guidelines for creating, making and publishing an iOS project that I will eventually want to transfer to another company/developer? I know this is a bit of a broad question, but I request that the given advice be a general list of tips, suggestions and pitfalls to avoid. If any particular bullet point on your list needs more explanation, I'll either search for the answer or post a new question specific to that requirement. Thank you! Note Regarding this Question I am posting this question on Programmers.SO because I think that this is an issue of software architecting, seeking advice for setting a new application project and publishing a project to the Apple iOS store-- all within the requirements for questions on this site.

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• why do Vagrant docs suggest using public IP address 33.33.33.10 for local VMs?

  - by Gert

  I'm following a tutorial to set up vagrant (a tool to build and configure portable virtual machine images), and it seems that vagrant documentation suggests using IPv4 address 33.33.33.10 to configure a new box. That is a publicly routed IP adress, so I'm a bit confused why using this address is suggested. Since I don't own this network, I should not use an address from the 33.33.33.10/8 range. Am I correct in thinking that I should only use either a public address from a network I own, or an address from one of the private ranges as defined in RFC 1918? If so, why does Vagrant documentation suggest otherwise?

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• Anyway to backup nginx before recompiling

  - by JM4

  I am looking to install the HttpGeoipModule for NGINX but learning I have to recompile the entire thing from source in order to do so. I have a new Media Temple DV 4.0 server and that comes with nginx v 1.3.0 stock and have never had to recompile from source before and a bit nervous to make changes without being able to revert to a previous state in the event something messes up (that and the fact it is affecting a live server so no idea what downtime is). My plan was to copy all the existing modules used (nginx -V to list them all and copy the modules already compiled). Then rebuild from source with the copied info above and including the ./configure --with-http_geoip_module reference. Is is possible to backup the existing nginx configuration in the event something goes wrong?

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• Dovecot/Postfix-mysql e-mail Aliases are not correctly forwarded

  - by jo_fryli

  I recently set up Dovecot/postfix-mysql on my Debian Squeeze Server and I have a bit of a problem. When ever I send a email to an alias ([email protected] forwarded to [email protected] for example) Postfix (or Dovecot, I'm not quite sure) puts this email into a Mailbox rather than forwarding it to the real Mail-Adress. I have tested all the MySQL queries and they all behave the way I intend them to do. foobar dovecot: deliver([email protected]): msgid=<000001385b464c9a-e40af11e-3bf4-49f6-903d-1d2369f6bfb6-000000@barfoo: saved mail to INBOX master.cf main.cf Keep in mind that normal E-Mail sending and receiving works just fine! I have set up my MySQL Tables with Postfixadmin. Thanks for your help!

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• Input/Output console window in XNA

  - by Will Bagley

  I am currently making a simple game in XNA but am at a point where testing various aspect gets a bit tricky, especially when you have to wait till you have 1000 score to see if your animation is playing correctly etc. Of course i could just edit the starting variable in the code before I launched but I have recently been interested in trying to implement a console style window which can print out values and take input to alter public variables during run-time. I am aware that VS has the immediate window which achieves a similar thing but i would prefer mine is an actual part of the game with the intention that the user may have limited access to it in the future. Some of the key things i have yet to find an answer to after looking around for a while are: how i would support free text entry how i would access variables during runtime how i would edit these variable I have also read about using a property grid from windows form aps (and partially reflection) which looked like it could simplify a lot of things but i am not sure how I would get that running inside my XNA game window or how i would get it to not look out of place (as the visual aspect of is seems to be aimed just for development time viewing). All in all I'm quite open to any suggestions on how to approach this task as currently I'm not sure where to start. Thanks in advance.

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• Windows 2008 additional disk going offline with reboots on Amazon EC2

  - by Ernest Mueller

  OK, so I took the stock Windows 2008 64-bit Amazon AMI and wanted to add a D: drive for page file space and crash dumps. I launched the instance with a second EBS volume attached as xvdf and went into Disk Management set it online, and added the page file and crash dump settings and all that works. But when I reboot, the box comes back up with that second drive as "Offline." How do I get that disk to automatically come online on reboot (or most notably, when I turn this into an AMI and launch more instances off it - I've tried that too and same deal with the D:).

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• Accidentally deleted /opt/local/bin without backup. Any help?

  - by Aaron

  Hi all, I'm on a Mac OS X 10.5.8 I was recently uninstalling mysql5 from /opt/local/bin. I typed: rm -rf /opt/local/bin mysql* instead of rm -rf /opt/local/bin/mysql* This deleted my entire /opt/local/bin directory which puts me in a bit of a bind. Is there any way to recover these files? If not, I have a friend that is using a similar set of programs, would it be possible to use the contents of his folder? If I end up needing to re-install everything in this folder, what is the best way to go about doing this? Thanks in advance!

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• HP Pavilion 15 with AMD dual graphics - Ubuntu live environment not starting

  - by creepus

  I've had this laptop for about a day now and have decided to try Ubuntu on it and determine if I want to install it. I created a USB, it booted (Secure Boot was on, I tried with Secure Boot off to no effect), and then the problem occurred. The screen turned off for a second, turned back on to a black screen, shut off again and turned back on with a dialogue box telling me that the system had to use low-graphics mode. I clicked OK, selected low-graphics mode from the menu and clicked OK. The screen switched to the boot messages and did not go any further than this. Ctrl+Alt+DEL started rebooting the laptop though. I tried booting again, but this time I edited the boot options in GRUB to add nomodeset. This time, the laptop only booted to a black screen. Ctrl+Alt+F2 took me to a prompt, I tried startx from there, but X didn't start, complaining that it wanted kernel mode setting back. I can not seem to find any option to disable one graphics chip or the other in the UEFI setup menus. Laptop : HP Pavilion 15-E004AU. The CPU : AMD A6-4400M APU with Radeon(tm) HD Graphics The graphics chip : AMD Radeon HD 7520G + 8670M Dual Graphics. The Ubuntu version : 13.10, 64 bit. Thanks. EDIT: I tried 12.04.3 LTS, it managed to bring the desktop up. There are severe graphics glitches after about two minutes though.

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• Microsoft releases Visual Studio 2010 SP1

  - by brian_ritchie

  Microsoft has been beta testing SP1 since December of last year.  Today, it was released to MSDN subscribers and will be available for public download on March 10, 2011.The service pack includes a slew of fixes, and a number of new features: Silverlight 4 supportBasic Unit Testing support for the .NET Framework 3.5Performance Wizard for SilverlightIntelliTrace for 64-bit and SharePointIIS Express supportSQL CE 4 supportRazor supportHTML5 and CSS3 support (IntelliSense and validation)WCF RIA Services V1 SP1 includedVisual Basic Runtime embeddingALM Improvements Of all the improvements, IIS Express probably has the largest impact on web developer productivity.  According to Scott Gu, it provides the following:It’s lightweight and easy to install (less than 10Mb download and a super quick install)It does not require an administrator account to run/debug applications from Visual Studio It enables a full web-server feature set – including SSL, URL Rewrite, Media Support, and all other IIS 7.x modules It supports and enables the same extensibility model and web.config file settings that IIS 7.x support It can be installed side-by-side with the full IIS web server as well as the ASP.NET Development Server (they do not conflict at all) It works on Windows XP and higher operating systems – giving you a full IIS 7.x developer feature-set on all OS platforms IIS Express (like the ASP.NET Development Server) can be quickly launched to run a site from a directory on disk.  It does not require any registration/configuration steps. This makes it really easy to launch and run for development scenarios.Good stuff indeed.  This will make our lives much easier.  Thanks Microsoft...we're feeling the love!  

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• The Bing Sting - an alternative opinion

  - by Charles Young

  I know I'm a bit of an MS fanboy at times, but please, am I missing something here? Microsoft, with permission of users, exploits clickstream data gathered by observing user behaviour. One use for this data is to improve Bing queries. Google equips twenty of its engineers with laptops and installs the widgets required to provide Microsoft with clickstream data. It then gets their engineers to repeatedly (I assume) type in 'synthetic' queries which bring back 'doctored' hits. It asks its engineers to then click these results (think about this!). So, the behaviour of the engineers is observed and the resulting clickstream data goes off to Microsoft. It is processed and 'improves' Bing results accordingly.   What exactly did Microsoft do wrong here?   Google's so-called 'Bing sting' is clearly a very effective attack from a propaganda perspective, but is poor practice from a company that claims to do no evil. Generating and sending clickstream data deliberately so that you can then subsequently claim that your competitor 'copied' that data from you is neither fair nor reasonable, and suggests to me a degree of desperation in the face of real competition.   Monopolies are undesirable, whether they are Microsoft monopolies or Google monopolies.    Personally, I'm glad Microsoft has technology in place to observe user behaviour (with permission, of course) and improve their search results using such data. I can only assume Google doesn't implement similar capabilities. Sounds to me as if, at least in this respect, Microsoft may offer the better technology.

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• SharePoint 2010 User Profile Sync - Remove Disabled Users

  - by ScaleOvenStove

  I have SharePoint 2010 set up to sync active directory users and it is working great. I am getting disabled users in the sync though. I have tried what all the blogs say, filter on userAccountControl bit on equals 2 but to no avail, the disabled users are still syncing. I am at a loss on where to look next. My last resort would be to create a ou/folder in AD and move disabled users there and remove that from the sync connector, but I don't really want to go there. Any ideas?

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• Making python run on my webserver

  - by richzilla

  Hi all, im getting a bit stuck regarding options for running python scripts on my server. From the research ive done so far, i can see i need to modify apache slightly to run python scripts, by using either mod_wsgi or mod_python. Two issues i have: mod_python doesnt appear to be maintained anymore (last release, 2007) mod_wsgi appears to require modification of my httpd.conf file on a per application basis. What im wanting to know, is there a way of getting python scripts to run in the same way as php, i.e. just by going to index.py etc... or is it more involved than that? At present im just trying to set it up on my xampp install. Any help would be appreciated.

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• Apache: Use Specific Applicaion for CGI scripts

  - by RandomInsano

  I have two servers, one in production and one for development. The production server is Solaris, dev is FreeBSD. Because of this, python is installed in different directories. I'm using Python right now for making CGI scripts, and needing to remember to swap my hashbangs when I copy from dev to production is a little annoying (Same issue for SVN updates depending on which server I'm comitting from). Is there a way to configure apache so that I no longer need to hashbangs? Like, if it would lauch python and supply the CGI script for it? Might be a bit of a stretch, but no harm in asking

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• USB Virtual RAM is not working properly

  - by Haseeb Anwar

  This images are help u in solving my question.1I have installed Windows 7 64 bit. I have made a virtual USB RAM but it is not working properly. First I go to the USB PropertiesReady Boost. Use this device as a virtual RAM and then click Apply then Ok. then I go to My Computer PropertiesAdvance system settingsAdvance(tab)SettingsAdvanceChange. When i click on change button the USB is not here. What can I do. Please answer my question.

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• Understanding and memorizing git rebase parameters

  - by Robert Dailey

  So far the most confusing portion of git is rebasing onto another branch. Specifically, it's the command line arguments that are confusing. Each time I want to rebase a small piece of one branch onto the tip of another, I have to review the git rebase documentation and it takes me about 5-10 minutes to understand what each of the 3 main arguments should be. git rebase <upstream> <branch> --onto <newbase> What is a good rule of thumb to help me memorize what each of these 3 parameters should be set to, given any kind of rebase onto another branch? Bear in mind I have gone over the git-rebase documentation again, and again, and again, and again (and again), but it's always difficult to understand (like a boring scientific white-paper or something). So at this point I feel I need to involve other people to help me grasp it. My goal is that I should never have to review the documentation for these basic parameters. I haven't been able to memorize them so far, and I've done a ton of rebases already. So it's a bit unusual that I've been able to memorize every other command and its parameters so far, but not rebase with --onto.

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• What's a good way for organizing PDF documents on windows?

  - by Ivan

  I'm looking for a good way to manage a lot of pdf documents (e.g. papers, ebooks) on windows. Ideally I'm looking for a windows version of the great mac app Yep. I've looked quite a bit and haven't found any windows app that provides and organized overview of your pdf documents. I've considered just tagging the pdf files, but there don't seem to be any apps to simply tag and search tagged files easily. I've found TaggedFrog, but the tags are kept in the app's internal DB and are associated with the filename. So if you move/rename a file it looses all its tags. In a nutshell: Is there a good windows app to organize/efficiently tag files?

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• Online File Sharing that acts just like LAN shared drives, etc.

  - by Dayton Brown

  Hi All, Have a small business client that wants to move their current file share to the web. Specs are as follows, 20 to 30 GB of space, file sizes are normal (nothing more than 50 to 100 mb) 3 users ideal solution would be exact same functionality as windows explorer. CHEAP!!! But not super cheap. I would like to keep it around $20 per user per month. I've explored a bunch of solutions, but they are all a bit on the complicated side. Thanks in advance for the recommendations.

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• Attributes of an Ethical Programmer?

  - by ahmed

  Software that we write has ramifications in the real world. If not, it wouldn't be very useful. Thus, it has the potential to sweep across the world faster than a deadly manmade virus or to affect society every bit as much as genetic manipulation. Maybe we can't see how right now, but in the future our code will have ever-greater potential for harm or good. Of course, there's the issue of hacking. That's clearly a crime. Or is it that clear? Isn't hacking acceptable for our government in the event of national security? What about for other governments? Cases of life-and-death emergency? Tracking down deadbeat parents? Screening the genetic profile of job candidates? Where is the line drawn? Who decides? Do programmers have responsibility for how their code is used? What if a programmer writes code to pry into confidential information or copy-protected material? Does he bear responsibility along with the person who used the program? What about a programmer who knowingly or unknowingly writes code to "fix the books?" Should he be liable?

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