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• web browsing vs. torrent traffic, and bandwidth priority?

  - by suli8

  recently i did download big torrent files. (120 Gb). and i need to seed them back to at least 1.5 ratio. my upload speed is 130 Kb/s max. the problem is that i need to seed them as fast as possible. but i browse the web a lot. and browsing with no upload left, can be very frustrating. I'm looking for something like this, torrent are on max. seeding rate, but when the browser needs the bandwidth, it gets it. priority is to web browser, but when not needed, torrent can be at max. i'm aware that i can change torrent client max speed. but doing it manually everytime and every 5 minutes or so, is hard. Info: i'm using firefox/chrome my torrent client is Ktorrent i'm on 11.10 with unity i do have a router, it's a HAG. and i can't access all it's properties. is this possible even? changing the priority in the system monitor for the applications can do the job?the nice value i mean. is there a way to set priority bandwidth usage for different apps? thank you!

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• Does immutability entirely eliminate the need for locks in multi-processor programming?

  - by GlenPeterson

  Part 1 Clearly Immutability minimizes the need for locks in multi-processor programming, but does it eliminate that need, or are there instances where immutability alone is not enough? It seems to me that you can only defer processing and encapsulate state so long before most programs have to actually DO something. If a program performs actions on multiple processors, something needs to collect and aggregate the results. All this involves multi-process communication before, after, and possibly during some transformations. The start and end state of the machines are different. Can this always be done with no locks just by throwing out each object and creating a new one instead of changing the original (a crude view of immutability)? What cases still require locking? I'm interested in both the theoretical/academic answer and the practical/real-world answer. I know a lot of functional programmers like to talk about "no side effect" but in the "real world" everything has a side effect. Every processor click takes time and electricity and machine resources away from other processes. So I understand that there may be more than one perspective to answer this question from. If immutability is safe, given certain bounds or assumptions, I want to know what the borders of the "safety zone" are exactly. Some examples of possible boundaries: I/O Exceptions/errors Interfaces with programs written in other languages Interfaces with other machines (physical, virtual, or theoretical) Special thanks to @JimmaHoffa for his comment which started this question! Part 2 Multi-processor programming is often used as an optimization technique - to make some code run faster. When is it faster to use locks vs. immutable objects? Given the limits set out in Amdahl's Law, when can you achieve better over-all performance (with or without the garbage collector taken into account) with immutable objects vs. locking mutable ones? Summary I'm combining these two questions into one to try to get at where the bounding box is for Immutability as a solution to threading problems.

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• Just installed 13.04 and everything is fine except I cannot connect to the internet. Any thoughts?

  - by razorccatu

  I just installed Ubuntu 13.04 on my HP G62 laptop and the install went smoothly. I did the install off of a USB drive after trying ubuntu. While I was testing it, I connected to my Wireless with out issue and surfed a little. After the install, no wireless. I can still connect to my wireless network (at least it tells me I'm connected at full strength) but No servers can be found. I attempted to ping Google to no avail and I attempted to ping my router to no avail. I tried to then hard wire the machine and once again it told me that I was connected but I was not. When I ran dmesg, I got the following message: Warning: nss-myhostname is not installed. Changing the local hostname might make it unresolvabe. Please install nss-hostname! Is the hostname the issue? if so, how do I resolve it with out internet connection? If it's not the issue, how do I move forward? Thanks for any help. EDIT. I forgot to attach the image of my ifconfig if that might help.

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• Cropping images & SEO

  - by user1181950

  So I have a page with a bunch of images with largely varying sizes. Also the layout of the page is such that the images are all in the shape of square tiles, so just resizing will cause distorted images. What I've been doing previously is when users upload images, I resize and crop them appropriately and display the new image as the thumbnail and load full image when user clicks on it. However, I just realized this is an issue with SEO as google will crawl the thumbnails and stick the thumbnails on Google Images instead of the full images. Is there any way to show a cropped/resized image but have Google Image show the full image? I can do something with css using an enclosing div and overflow:hidden, but I'd imagine the performance on that would be pretty bad. Any suggestions? Thanks! PS. I saw this (Make google index the actual image not the thumbnail), but in my case I have users continuously uploading images, and the database of images is always changing and pretty big (thousands), so sitemap will be pretty unwieldy..

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• Set default owner/user

  - by Daniel Hollands

  I'm a web developer, and so have set-up an old machine in the office as an Ubuntu Server, for the purposes of testing websites. I've set-up LAMP and have created a /var/www folder, from which all my local sites are served. The issue is that of user permissions, i.e. any files that I copy into that folder (from my Windows machine via the network) automatically take on me (daniel) as their owner. The problem is that I want www-data to become the owner. I did some research and saw that it should be possible to use setuid (and setgid) to automatically set www-data as the owner of all files put into /var/www automatically, so far I've not had any luck making it work. Can someone help please? Thank you UPDATE: Would this do what I want it to do? Default file permissions for php user www-data UPDATE 2: I've kinda fixed my issue by changing my samba settings. Using Webmin, I was able to go in and change the default settings (as seen here: http://imageshack.us/photo/my-images/521/captureon.png/)

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• Real-time stock market application

  - by Sam

  I'm an amateur programmer. I'd like to develop a software application (like Tradestation), to analyse real-time market data. Please teach me if the following approach is correct, ie the procedures, knowledge or software needed etc: Use a DB to read the real-time feed from data provider: what should be the right DB to use? I know it should be a time serious one. Can I use SQL, Mysql, or others? What database can receive real-time data feed? Do I need to configure the DB to do this? If the real-time data is in ASCII form, how can it be converted to those that can be read by the DB and my application? Should I have to write codes or just use some add-ins? What kind of add-in are needed? How should I code the program to retrieve the changing data from the DB so that the analysis software screen data can also change asynchronously? (like the RTD in excel) Which aspects of programming do I need to learn to develop the above? Are there web resources/ books I can refer to for more information?

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• USB device not accepting address

  - by Mike Williamson

  I have a series of machines that I am building for work that have usb card readers. When I boot them I get a long series of messages: ... [ 2347.768419] hub 1-6:1.0: unable to enumerate USB device on port 6 [ 2347.968178] usb 1-6.6: new full-speed USB device number 10 using ehci_hcd [ 2352.552020] usb 1-6.6: device not accepting address 10, error -32 [ 2352.568421] hub 1-6:1.0: unable to enumerate USB device on port 6 [ 2352.768179] usb 1-6.6: new full-speed USB device number 12 using ehci_hcd [ 2357.352033] usb 1-6.6: device not accepting address 12, error -32 ... On some older machines this only takes a few attempts before the card reader finally accepts an address, while on newer machines it can take many minutes. Changing hardware is not an option and plugging the usb card reader into a different port is only an option for the older manchines. This was a problem under 11.04 and I am now running the 12.04 beta and its still happening. Is there something I can do in the software (a udev rule perhaps?) that would fix this? Any advice appreciated. I'm happy to provide more details if you need them.

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• Ch-ch-ch-changes...

  - by Lou Vega

  The last few months have been pretty crazy. Just before the MVP summit in February I was approached about changing to a different project with my (then current) employer, and right after the summit I was approached by another company. Eventually I went with the new company and a new role in the Information Assurance field. More to come on that as things progress. All that being said I've not been as active in the .NET community as I once was and I miss it - so I'm looking to dive back in especially as Windows Phone 7 draws nearer and nearer. Speaking of the community - many of you may not recognize me if you see me now :) I had told my son for the last couple years that I would cut my hair before he turned 5 (he always asked how come he didn't have long hair) and he turns 5 (time has flown!) on June 19th so May 30th I cut my long hair down pretty short and donated the hair to Locks of Love. As Chris said to me on Twitter, "pics or it didn't happen" - well fortunately my wife was there to document the whole thing so I'll get a picture or two posted here soon.

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• Interesting 3d zooming technique

  - by stark

  Is it possible to zoom to a certain point on screen by modifying the field of view and rotating the camera as to keep that point/object in the same place on screen while zooming ? Changing the camera position is not allowed.. I projected the 3d pos of the object on screen and remembered it. Then on each frame I calculate the direction to it in camera space and then I construct a rotation matrix to align this direction to Z axis (in cam space). After this, I calculate the direction from the camera to the object in world space and transform this vector with the matrix I obtained earlier and then use this final vector as the camera's new direction. And it's actually "kinda working", the problem is that it is more/less off than the camera's rotation before starting to zoom depending on the area you are trying to zoom in (larger error on edges/corners). It looks acceptable, but I'm not settling for only this. Any suggestions/resources for doing this technique perfectly ? If some of you want to explain the math in detail, be my guests, I can understand these things well. Thanks. Edit: I'll check often for responses, I'm really curious about this :D

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• Windows Azure Horror Story: The Phantom App that Ate my Data

  - by jasont

  Originally posted on: http://geekswithblogs.net/jasont/archive/2013/10/31/windows-azure-horror-story-the-phantom-app-that-ate-my.aspxI’ve posted in the past about how my company, Stackify, makes some great tools that enhance the Windows Azure experience. By just using the Azure Management Portal, you don’t get a lot of insight into what is happening inside your instances, which are just Windows VMs. This morning, I noticed something quite scary, and fittingly enough, it’s Halloween. I deleted a deployment after doing a new deployment and VIP swap. But, after a few minutes, the instance still appeared in my Stackify dashboard. I thought this odd, as we monitor these operations and remove devices that have been deleted. Digging in showed that it wasn’t a problem with Stackify. This instance was still there, and still sending data. You’ll notice though that the “Status” check shows that the instance no longer exists. And it gets scarier. I quickly checked the running services, and sure enough, the Windows Azure Guest Agent (which runs worker roles) was still running: “Surely, this can’t be” I’m thinking at this point. Knowing that this worker role is in our QA environment, it has debug logging turned on. And, using our log file tailing feature, I can see that, yes, indeed, this deleted deployment is still executing code. Pulling messages off queues. Sending alerts. Changing data. Fortunately, our tools give me the ability to manually disable the Windows service that runs this code. In the meantime, I have contacted everyone I know (and support) at Microsoft to address this issue. Needless to say, this is concerning. When you delete a deployment, it needs to actually delete. Not continue to eat your data. As soon as I learn more, I’ll be posting an update.

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• Compressing 2D level data

  - by Lucius

  So, I'm developing a 2D, tile based game and a map maker thingy - all in Java. The problem is that recently I've been having some memory issues when about 4 maps are loaded. Each one of these maps are composed of 128x128 tiles and have 4 layers (for details and stuff). I already spent a good amount of time searching for solutions and the best thing I found was run-length enconding (RLE). It seems easy enough to use with static data, but is there a way to use it with data that is constantly changing, without a big drop in performance? In my maps, supposing I'm compressing the columns, I would have 128 rows, each with some amount of data (hopefully less than it would be without RLE). Whenever I change a tile, that whole row would have to be checked and I'm affraid that would slow down too much the production (and I'm in a somewhat tight schedule). Well, worst case scenario I work on each map individually, and save them using RLE, but it would be really nice if I could avoind that. EDIT: What I'm currently using to store the data for the tiles is a 2D array of HashMaps that use the layer as key and store the id of the tile in that position - like this: private HashMap< Integer, Integer [][]

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• Rendering text with stb_font results in glitches

  - by Fabian Fritz

  I'm trying to render text with OpenGL and an "inline"-font taken from the stb_fonts The relevant code for initializing the font & rendering: LabelFactory::LabelFactory() { static unsigned char fontpixels [STB_SOMEFONT_BITMAP_HEIGHT][STB_SOMEFONT_BITMAP_WIDTH]; STB_SOMEFONT_CREATE(fontdata, fontpixels, STB_SOMEFONT_BITMAP_HEIGHT); glGenTextures(1, &texture); glBindTexture(GL_TEXTURE_2D, texture); glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, STB_SOMEFONT_BITMAP_WIDTH, STB_SOMEFONT_BITMAP_HEIGHT, 0, GL_ALPHA, GL_UNSIGNED_BYTE, fontdata); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); } void LabelFactory::renderLabel(Label * label) { int x = label->x; int y = label->y; const char * str = label->text; glBindTexture(GL_TEXTURE_2D, texture); glEnable(GL_BLEND); glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); glEnable(GL_ALPHA_TEST); glColor4f(1.0f, 1.0f, 1.0f, 1.0f); glEnable(GL_TEXTURE_2D); glBegin(GL_QUADS); while (*str) { int char_codepoint = *str++; stb_fontchar *cd = &fontdata[char_codepoint - STB_FONT_arial_14_usascii_FIRST_CHAR]; glTexCoord2f(cd->s0, cd->t0); glVertex2i(x + cd->x0, y + cd->y0); glTexCoord2f(cd->s1, cd->t0); glVertex2i(x + cd->x1, y + cd->y0); glTexCoord2f(cd->s1, cd->t1); glVertex2i(x + cd->x1, y + cd->y1); glTexCoord2f(cd->s0, cd->t1); glVertex2i(x + cd->x0, y + cd->y1); x += cd->advance_int; } glEnd(); } However this results in weird glitches I guess I'm doing something wrong with the alpha blending, however I was unable to improve it by changing the parameters. The size and length of the outline of the text that should be shown seems about right (it should read "Test Test Test").

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• How do I increase the open files limit for a non-root user?

  - by iCode

  This is happening on Ubuntu Release 12.04 (precise) 64-bit Kernel Linux 3.2.0-25-virtual I'm trying to increase the number of open files allowed for a user. This is for an my ecplise java application where the current limit of 1024 is not enough. According to the posts I've found so far, I should be able to put lines into /etc/security/limits.conf like this; soft nofile 4096 hard nofile 4096 to increase the number of open files allowed for all users. But, that's not working for me, and I think the problem is not related to that file. For all users, the default limit is 1024, regardless of what is in /etc/security/limits.conf (I have been rebooting after changing that file) $ ulimit -n 1024 Now, despite the entries in /etc/security/limits.conf I can't increase that; $ ulimit -n 2048 -bash: ulimit: open files: cannot modify limit: Operation not permitted The weird part is that I can change the limit downwards, but can't change it upwards - even to go back to a number which is below the original limit; $ ulimit -n 800 $ ulimit -n 800 $ ulimit -n 900 -bash: ulimit: open files: cannot modify limit: Operation not permitted As root, I can change that limit to whatever I want, up or down. It doesn't even seem to care about the supposedly system-wide limit in /proc/sys/fs/file-max # cat /proc/sys/fs/file-max 188897 # ulimit -n 188898 # ulimit -n 188898 So far, I haven't found any way to increase the open files limit for a non-root user, and I really don't want to be running my application as root. How should I properly do this? I have looked at all the posted and tried the given options but no luck!

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• Directory error when trying to create a new user

  - by Tom Brossman

  I added a second user 'shirley' in Settings - User Accounts, and set a password. The account type is Standard. In 11.04, this worked and I logged in and had a functioning desktop for this user. How is this done in 11.10? When I try to log in as this user I have this error: Nautilus could not create the required folder "/home/shirley/.config/nautilus". Before running Nautilus, please create the following folder, or set permissions such that Nautilus can create it. The only option then is to click OK, this dumps me out to full-screen Nautilus, like this: There is no launcher or visible way to start any programs. Print screen doesn't take a screengrab. The desktop is similar to this question but I get no terminal when I press CTRL+ALT+T. I have to press CTRL+ALT+F2 and restart from the terminal to get out of this. This answer is to install gnome-system-tools. Shouldn't I be able to add a second user with the default install? EDIT: I tried the deluser+adduser suggestion, there was no change after trying it. Here is what I got: tom@desktop:~$ sudo deluser shirley [sudo] password for tom: Removing user `shirley' ... Warning: group `shirley' has no more members. Done tom@desktop:~$ sudo adduser shirley Adding user `shirley' ... Adding new group `shirley' (1001) Adding new user shirley' (1001) with groupshirley' The home directory '/home/shirley' already exists. Not copying from `/etc/skel'. Enter new UNIX password: Retype new UNIX password: passwd: password updated successfully Changing user information for shirley Enter the new value, or press ENTER for the default Full Name []: Room Number []: Work Phone []: Home Phone []: Other []: Is the information correct? [Y/n] y What has gone so wrong with simply adding a second user? Am I the only one having this problem? I'd reinstall if that fixed things, but this is a fresh install only a few days old.

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• Partitioning Strategies for P6 Reporting Database

  - by Jeffrey McDaniel

  Prior to P6 Reporting Database version 3.2 sp1 range partitioning was used. This was applied only to the history tables. The ranges were defined during installation and additional ranges would need to be added once your date range entered the final defined range. As of P6 Reporting Database version 3.2 sp1, interval partitioning was implemented. Interval partitioning was applied to the existing History table as well as Slowly Changing Dimension tables. One of the major advantages of interval partitioning is there is no more manual addition of ranges. The interval partitioning will automatically create partitions for the defined interval when data is inserted into the table and it exceeds the existing partitions. In 3.2 sp1 there are steps on how to update your partitioning. For all versions after 3.2 sp1 interval partitioning is the only partitioning option used. When upgrading it is important to be aware of these changes. Here is a link with more information on partitioning -the types and the advantages. http://docs.oracle.com/cd/E11882_01/server.112/e25523/partition.htm

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• How to do a multishot in xna?

  - by DeVonte

  I am trying to simulate a gun in which shoots multiple bullets at the same time(similar to a spread out shot). I am thinking I have to create another bullet array then do the same as I have below but in a different direction. Here is what I have so far: foreach (GameObject bullet in bullets) { // Find a bullet that isn't alive if (!bullet.alive) { //And set it to alive bullet.alive = true; if (flip == SpriteEffects.FlipHorizontally) //Facing right { float armCos = (float)Math.Cos(arm.rotation - MathHelper.PiOver2); float armSin = (float)Math.Sin(arm.rotation - MathHelper.PiOver2); // Set the initial position of our bullets at the end of our gun arm // 42 is obtained by taking the width of the Arm_Gun texture / 2 // and subtracting the width of the Bullet texture / 2. ((96/2)=(12/2)) bullet.position = new Vector2( arm.position.X + 42 * armCos, arm.position.Y + 42 * armSin); // And give it a velocity of the direction we're aiming. // Increae/decrease speed by changeing 15.0f bullet.Velocity = new Vector2( (float)Math.Cos(arm.rotation - MathHelper.PiOver4 + MathHelper.Pi + MathHelper.PiOver2), (float)Math.Sin(arm.rotation - MathHelper.PiOver4 + MathHelper.Pi + MathHelper.PiOver2)) * 15.0f; } else //Facing left { float armCos = (float)Math.Cos(arm.rotation + MathHelper.PiOver2); float armSin = (float)Math.Sin(arm.rotation + MathHelper.PiOver2); //Set the initial position of our bullet at the end of our gun arm //42 is obtained be taking the width of the Arm_Gun texture / 2 //and subtracting the width of the Bullet texture / 2. ((96/2)-(12/2)) bullet.position = new Vector2( arm.position.X - 42 * armCos, arm.position.Y - 42 * armSin); //And give it a velocity of the direction we're aiming. //Increase/decrease speed by changing 15.0f bullet.Velocity = new Vector2( -armCos, -armSin) * 15.0f; } return; }// End if }// End foreach

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• Configuring permissions with Bastille

  - by Lucio

  I was using Bastille to improve the security of OS and I found the next question there I don't know if I should answer for YES or NOT: Questions: Would you like to set more restrictive permissions on the administration utilities? Explanation: In general, the default file permissions set by most vendors are fairly secure. To make them more secure, though, you can remove non-root user access to some administrator functions. If you choose this option, you'll be changing the permissions on some common system administration utilities so that they're not readable or executable by users other than root. These utilities (which include linuxconf, fsck, ipconfig, runlevel and portmap) are ones that most users could never have a need to access. This option will increase your system security, but there's a chance it will inconvenience your users. My users: When I installed Ubuntu I had create a user (admin), then I was able to create another user (people) but I cannot change the permissions of this user. Questions: The user there I am using like admin it's not the root, right? The effects of this option will affect to the two users (admin & people) or just to people?

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• GNOME changes to KDE on Maverick

  - by Pit

  Hi, I recently made a clean/fresh install of Ubuntu 10.10 an experienced the problem that the theme changes from Gnome to KDE and back randomly and partly. Sometimes after starting my computer I will have a KDE theme. If I then open the Appearance Preferences ( System - Preferences - Appearance ) some applications and the main-menu as well as menu of applications (only upper two centimetres of a application window) will change back to Gnome only by opening it, not changing anything nor saving. I did not choose KDE at any time, nor did I do any changes to the appearance prior to the first occurrence of this bug. On a second computer I updated from 10.04 to 10.10 and experienced the same bug. On this computer I did however change the layout of the minimize;maximise;close buttons by following How do I move the Window buttons from left to right?. But I don't see how this could provoke the bug, especially as it occurs on a second computer. Will doing updates I saw that there a quite a lot of KDE packages being downloaded. Do I even need those if I don't want to use KDE?

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• How can I find which "command" corresponds to opening a gnome-panel menu, for use in a keyboard shortcut?

  - by Ryan Jendoubi

  There are many questions and answers here and around the web on setting basic keyboard shortcuts in GNOME. Most of them are either for launching applications, or Compiz settings, or for changing defaults for other things for which Ubuntu provides defaults shortcuts. What I want to know though is how to refer to a gnome-panel menu item in a custom keyboard shortcut. I'm using Ubuntu 11.10 with GNOME Classic, and the old GNOME 2 / Ubuntu 10.04 keyboard shortcuts for the main menus (Alt-F1) and the "Me Menu" (Super+S) don't seem to work. So my question is two-fold. Primarily I'd like to know how to set those shortcuts. But a second-order question is how I could have found this out myself: is there some program I can use to see what signals or commands are fired off when I click on various things, in this case gnome-panel menu items? I'm interested in the broader question because I've sometimes wanted to set shortcuts for specific menus or menu items in GNOME 2, so a way to find out what command I need there would be useful. Give a man a rod, as they say :-) I've had a look at a good lot of keyboard shortcut and menu related items here to no avail. One somewhat relevant question is this one, but it's just a "how do I do it" question, and applies to Unity, not GNOME, although it would be great if whatever investigatory method answers this question might also apply under different desktops, like Unity. The answer to this question is essentially how I was doing it in 10.04 / GNOME 2, although the questioner's query isn't exactly addressed - how to get directly to "Broadcast" with a key combination. Again, it would be great if an answer delving into how such menus work and how they interact with the rest of the system would be applicable to pinpoint menu items.

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• Creating an update method in a different class

  - by Sweta Dwivedi

  I have created a class called 3D model which will animate my 3D model by changing the model position according to the values based in a .txt file through a list... Since i'm using a foreach loop to read the point values when it reaches the end of the file.. XNA throws an out of bounds exception .. (which is obvious) but if i add the same code in my Game.cs update(gameTime) method.. then i dont have this problem..Any idea how to make my 3D model update work same as the update in game.cs .. Here is the code for some idea: public void patterns(GameTime gameTime) { motion_z = new List<Point3D>(); if (pattern == 1) { f = "E:/Motion_Track-output/Output1.txt"; } if (pattern == 2) { f = "E:/Motion_Track-output/cruse.txt"; } // TODO: Add your update logic here using (StreamReader r = new StreamReader(f)) { string line; //Viewport view = graphics.GraphicsDevice.Viewport; int maxWidth = view.Width; int maxHeight = view.Height; while ((line = r.ReadLine()) != null) { string[] temp = line.Split(','); int x = (int)Math.Floor(((float.Parse(temp[0]) * 0.5f) + 0.5f) * maxWidth); int y = (int)Math.Floor(((float.Parse(temp[1]) * -0.5f) + 0.5f) * maxHeight); int z = (int)Math.Floor(((float.Parse(temp[2]) / 4 * 20000))); motion_z.Add(new Point3D(x, y, z)); } modelPosition.X = (float)(motion_z[i].X); modelPosition.Y = (float)(motion_z[i].Y); modelPosition.Z = (float)(motion_z[i].Z); i++; } //Console.WriteLine("modelposX:" + modelPosition.X + "," + "motionzX:" + motion_z[i].X); }

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• How to switch to a generic kernel in a headless Ubuntu Server 12.04?

  - by chmike

  I just got a dedicated server with Ubuntu 12.04 installed with a custom compiled kernel. Since I would like to install VirtualBox and this custom kernel doesn't support dynamic module loading (for security) I need to change the kernel. I'm running some Ubuntu servers for years but never palyed with grub and a headless computer. When the command update-grub is run it shows the different kernel it finds. Here is what I see Generating grub.cfg ... Found linux image: /boot/bzImage-3.2.13-xxxx-grs-ipv6-64 Found linux image: /boot/vmlinuz-3.2.0-34-generic Found initrd image: /boot/initrd.img-3.2.0-34-generic No volume groups found done The first one is the active one as seen with uname -r. To me it looks like the second kernel is the one I should use. But I don't know how to configure grub2 to use it. The computer is also configured with a software RAID using mdadm I guess. Never used that before. I don't know if playing with the grub of changing kernel could brake this. What must I do to set the generic kernel as the default one so that I can get VirtualBox running.

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• With Slick, how to change the resolution during gameplay?

  - by TheLima

  I am developing a tile-based strategy game using Java and the Slick API. So far so good, but I've come to a standstill on my options menu. I have plans for the user to be able to change the resolution during gameplay (it is pretty common, after all). I can already change to fullscreen and back to windowed, this was pretty simple... //"fullScreenOption" is a checkbox-like button. if (fullScreenOption.isMouseOver(mouseX, mouseY)) { if (input.isMouseButtonDown(Input.MOUSE_LEFT_BUTTON)) { fullScreenOption.state = !fullScreenOption.state; container.setFullscreen(fullScreenOption.state); } } But the container class (Implemented by Slick, not me), contrary to my previous beliefs, does not seem to have any resolution-change functions! And that's pretty much the situation...I know it's possible, but i don't know how to do it, nor what is the class responsible! The AppGameContainer class, used on the very start of the game's initialization, is the only place with any functions for changing the display-mode that I've found so far, but it's only used at the very start, and i haven't found a way to travel back to it from my options menu. //This is my implementation of it... public static void main(String[] args) throws SlickException { AppGameContainer app = new AppGameContainer(new Main()); // app.setTargetFrameRate(60); app.setVSync(true); app.setDisplayMode(800, 600, false); app.start(); } I can define it as a static global on the Main, but it's probably a (very) bad way to do it...

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• VLC Ati Radeon 6870 Ubuntu 12.04 image skewed flicker

  - by Aaron

  I'm running Ubuntu 12.04 with ATI Radeon 6870 connected to my 40' Sharp TV. The video image is slightly jigged, like breaking a bit and slightly delayed. It just isn't smooth. The computer is very fast, like i7 with 12gb ram. I tried to run the same video with my mac laptop and on the tv with the same connection cable and it was running smoothly. i tried changing the video output in VLC to x11, increase caching, h264 skip loop filter to all, increase monitor refresh rate although it's already at 60 and it's an LCD tv. this is my xorg.conf : Section "ServerLayout" Identifier "amdcccle Layout" Screen 0 "amdcccle-Screen[3]-0" 0 0 EndSection Section "Module" Load "glx" EndSection Section "Monitor" Identifier "0-DFP9" Option "VendorName" "ATI Proprietary Driver" Option "ModelName" "Generic Autodetecting Monitor" Option "DPMS" "true" Option "TargetRefresh" "60" Option "Position" "0 0" Option "Rotate" "normal" Option "Disable" "false" Option "PreferredMode" "1920x1080" EndSection Section "Monitor" Identifier "0-DFP10" Option "VendorName" "ATI Proprietary Driver" Option "ModelName" "Generic Autodetecting Monitor" Option "DPMS" "true" Option "PreferredMode" "1280x1024" Option "TargetRefresh" "60" Option "Position" "0 0" Option "Rotate" "normal" Option "Disable" "false" EndSection Section "Device" Identifier "amdcccle-Device[3]-0" Driver "fglrx" Option "Monitor-DFP9" "0-DFP9" BusID "PCI:3:0:0" EndSection Section "Screen" Identifier "Default Screen" DefaultDepth 24 EndSection Section "Screen" Identifier "amdcccle-Screen[3]-0" Device "amdcccle-Device[3]-0" DefaultDepth 24 SubSection "Display" Viewport 0 0 Depth 24 EndSubSection EndSection

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• Mobile Web Applications – A guide for professional development

  - by JuergenKress

  (Tobias Bosch, Stefan Scheidt, Torsten Winterberg / Opitz Consulting Deutschland GmbH). There is a real hype around mobile solutions. Smartphones and tablets are everywhere. Frontend architecture is changing quickly to adopt cross browser technologies like HTML5 and extensive JavaScript-based development. In this book we introduce our software development process to build test-driven Single-Page JavaScript Web Applications, which will be the future next to native apps. We start with a short introduction of our RYLC showcase (know from our SOA articles), give a very short introduction to JavaScript, then talk about jQuery Mobile, Angular JS, Testing, Backend-communication and we close with deploying our RYLC-Webapp as a hybrid app using the PhoneGap (Cordova) framework. Don’t expect too much theory – it’s a practical guide explaining how RYLC Web App was built, to kickstart your own development. Currently only available in German as paperback and eBook. WebLogic Partner Community For regular information become a member in the WebLogic Partner Community please visit: http://www.oracle.com/partners/goto/wls-emea ( OPN account required). If you need support with your account please contact the Oracle Partner Business Center. BlogTwitterLinkedInMixForumWiki Technorati Tags: adf mobil

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• Is creating a separate pool for each individual image created from a png appropriate?

  - by Panzercrisis

  I'm still possibly a little green about object-pooling, and I want to make sure something like this is a sound design pattern before really embarking upon it. Take the following code (which uses the Starling framework in ActionScript 3): [Embed(source = "/../assets/images/game/misc/red_door.png")] private const RED_DOOR:Class; private const RED_DOOR_TEXTURE:Texture = Texture.fromBitmap(new RED_DOOR()); private const m_vRedDoorPool:Vector.<Image> = new Vector.<Image>(50, true); . . . public function produceRedDoor():Image { // get a Red Door image } public function retireRedDoor(pImage:Image):void { // retire a Red Door Image } Except that there are four colors: red, green, blue, and yellow. So now we have a separate pool for each color, a separate produce function for each color, and a separate retire function for each color. Additionally there are several items in the game that follow this 4-color pattern, so for each of them, we have four pools, four produce functions, and four retire functions. There are more colors involved in the images themselves than just their predominant one, so trying to throw all the doors, for instance, in a single pool, and then changing their color properties around isn't going to work. Also the nonexistence of the static keyword is due to its slowness in AS3. Is this the right way to do things?

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