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• Hyper-V R2 Performance Counters

  - by Ascendo

  Hi all I've been playing around with the WMI performance counters for Hyper-V. Of interest to me are the Virtual NIC bytes/sec input and output counters. I notice that the results are very "spikey". Over what time period is the latest counter averaged? I'm trying to calculate total traffic volume per VM, but sometimes a very high instantaneous poll result is inflating the result as I only poll the result each minute. I would prefer to read a 'bytes total' counter instead of a 'bytes/sec' counter - is there such a thing? Thanks Acendo

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• What is the correct way to restart udev in Ubuntu?

  - by zerkms

  I've changed the name of my eth1 interface to eth0. How to ask udev now to re-read the config? service udev restart and udevadm control --reload-rules don't help. So is there any valid way except of rebooting? (yes, reboot helps with this issue) UPD: yes, I know I should prepend the commands with sudo, but either one I posted above changes nothing in ifconfig -a output: I still see eth1, not eth0. UPD 2: I just changed the NAME property of udev-rule line. Don't know any reason for this to be ineffective. There is no any error in executing of both commands I've posted above, but they just don't change actual interface name in ifconfig -a output. If I perform reboot - then interface name changes as expected. UPD 3: let I explain all the case better ;-) For development purposes I write some script that clones virtual machines (VirtualBox-driven) and pre-sets them up in some way. So I perform a command to clone VM, start it and as long as network interface MAC is changed - udev adds the second rule to network persistent rules. Right after machine is booted for the first time there are 2 rules: eth0, which does not exist, as long as it existed in the original VM image MAC eth1, which exists, but all the configuration in all files refers to eth0, so it is not that good for me So I with sed delete the line with eth0 (it is obsolete and useless in cloned image) and replace eth1 with eth0. So currently I have valid persistent rule, but there is still eth1 in /dev. The issue: I don't want to reboot the machine (it will take another time, which is not good thing on building-VM-stage) and just want to have my /dev rebuilt with some command so I have ready-to-use VM without any reboots.

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• A PDF viewer for large margins in fullscreen

  - by jmn

  I am looking for a way to pleasantly read PDF files on my widescreen (22" 1680x1050) monitor. My problem with all pdf the PDF-viewer applications I have tried is that they do not handle wide and high margins well. If I go to fullscreen mode in my viewer and zoom in so that the extra margins are cropped, I can view the pages nicely, the annoyance however is that I have to reposition the pages every time I navigate to another page. I am sure there must be a way to make a PDF viewer that can solve this problem and perhaps there is one you know of? I am aware of something called PDF Reflow in Acrobat Reader but that only works with certain specific (tagged) files. I want a PDF viewer with a smarter zoom/next page function or an automatic margin-crop function. Is there such a thing?

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• Seeking automated toolchain for WAV cleanup and conversion to MP3 (currently using Audacity manually

  - by Andrew M. Greene

  I use Finale with the Garritan sounds to convert my music into WAV files; after that I manually load each one into Audacity and select all use the "normalize" effect (with default settings) manually select the silence at the beginning of the file and delete it manually select the silence at the end of the file and delete it finally export the whole thing as an MP3 (with specific tag data) This gets tedious, especially as I work on a ten-movement piece with six part-prominent rehearsal "tapes" to accompany the full-score rendition. And there are too many variations in what's going on for me to trust AutoHotKey for this one. Is there a way to script Audacity, or is there another toolchain that would do what I want? I'm running on a WindowsXP laptop with cygwin installed. Thanks!

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• C# vector class - Interpolation design decision

  - by Benjamin

  Currently I'm working on a vector class in C# and now I'm coming to the point, where I've to figure out, how i want to implement the functions for interpolation between two vectors. At first I came up with implementing the functions directly into the vector class... public class Vector3D { public static Vector3D LinearInterpolate(Vector3D vector1, Vector3D vector2, double factor) { ... } public Vector3D LinearInterpolate(Vector3D other, double factor { ... } } (I always offer both: a static method with two vectors as parameters and one non-static, with only one vector as parameter) ...but then I got the idea to use extension methods (defined in a seperate class called "Interpolation" for example), since interpolation isn't really a thing only available for vectors. So this could be another solution: public class Vector3D { ... } public static class Interpolation { public static Vector3D LinearInterpolate(this Vector3D vector, Vector3D other, double factor) { ... } } So here an example how you'd use the different possibilities: { var vec1 = new Vector3D(5, 3, 1); var vec2 = new Vector3D(4, 2, 0); Vector3D vec3; vec3 = vec1.LinearInterpolate(vec2, 0.5); //1 vec3 = Vector3D.LinearInterpolate(vec1, vec2, 0.5); //2 //or with extension-methods vec3 = vec1.LinearInterpolate(vec2, 0.5); //3 (same as 1) vec3 = Interpolation.LinearInterpolation(vec1, vec2, 0.5); //4 } So I really don't know which design is better. Also I don't know if there's an ultimate rule for things like this or if it's just about what someone personally prefers. But I really would like to hear your opinions, what's better (and if possible why ).

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• Two JavaFX Community Rock Stars Join Oracle

  - by Tori Wieldt

  from Sharat Chander, Director - Java Technology Outreach: These past 24+ months have proved momentous for Oracle's stewardship of Java.  A little over 2 years ago when Oracle completed its acquisition of Sun, a lot of community speculation arose regarding Oracle's Java commitment.  Whether the fears and concerns were legitimate or not, the only way to emphatically demonstrate Oracle's seriousness with moving Java forward was through positive action.  In 2010, Oracle committed to putting Java back on schedule whereby large gaps between release trains would be a thing of the past.  And in 2011, that promise came true.  With the 2011 summer release of JDK 7, the Java ecosystem now had a version brought up to date.  And then in the fall of 2011, JavaFX 2.0 righted the JavaFX ship making rich internet applications a reality. Similar progress between Oracle and the Java community continues to blossom.  New-found relationship investments between Oracle and Java User Groups are taking root.  Greater participation and content execution by the Java community in JavaOne is steadily increasing.  The road ahead is lit with bright lights and opportunities. And now there's more good news to share.  As of April 2nd, two recognized JavaFX technology luminaries and "rock stars" speakers from the Java community are joining Oracle on a new journey. We're proud to have both Jim Weaver and Stephen Chin joining Oracle's Java Evangelist Team.  You'll start to see them involved in many community facing activities where their JavaFX expertise and passion will shine.  Stay tuned! Welcome @JavaFXpert and @SteveonJava !

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• PGP Desktop Whole disk Encryption paused on a toshiba ultrabook z935

  - by garg

  I have a Toshiba z930 Ultrabook with PGP Desktop installed for whole disk encryption. It installed correctly, and started encrypting but it stays paused. If I reboot, it shows me the PGP desktop username, password, domain screen. If I enter in my credentials, it allows me to get into windows but encryption remains paused. If I click on resume, it lets me enter a password, accepts it but then it doesn't do anything. One suspicious thing is that in the 'Select disk or partition to encrypt' box, it says, C: 120B fixed disk. Unknown Bus: TOSHIBA THNSNS12... Do I need to change something in the BIOS, or install any drivers so that it doesn't see it as an Unknown Bus?

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• OpenBSD in a virtual box as a firewall

  - by Ali

  Is there any merit in installing a virtual machine with OpenBSD and pf (or any other simple and secure OS + iptable) on a mac laptop and routing all the traffic through that machine? I read a similar set up for corporate laptops running windows (I thing I read this in BSD magazine). They claim that Windows machines are too hard to secure and if you are taking them to the wild (public wireless, hotels, ...) you'd better but a secure OS in between! If you think this is a good idea, how you route all the traffic on a mac through the virtual machine and prevent any application or service to go directly? I am not sure if just setting the gateway will do that, what about DNS? you don't want anybody to fool you with DNS cache poisoning or similar attacks either.

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• Coarse Collision Detection in highly dynamic environment

  - by Millianz

  I'm currently working a 3D space game with A LOT of dynamic objects that are all moving (there is pretty much no static environment). I have the collision detection and resolution working just fine, but I am now trying to optimize the collision detection (which is currently O(N^2) -- linear search). I thought about multiple options, a bounding volume hierarchy, a Binary Spatial Partitioning tree, an Octree or a Grid. I however need some help with deciding what's best for my situation. A grid seems unfeasible simply due to the space requirements and cache coherence problems. Since everything is so dynamic however, it seems to be that trees aren't ideal either, since they would have to be completely rebuilt every frame. I must admit I never implemented a physics engine that required spatial partitioning, do I indeed need to rebuild the tree every frame (assuming that everything is constantly moving) or can I update the trees after integrating? Advice is much appreciated - to give some more background: You're flying a space ship in an asteroid field, and there are lots and lots of asteroids and some enemy ships, all of which shoot bullets. EDIT: I came across the "Sweep an Prune" algorithm, which seems like the right thing for my purposes. It appears like the right mixture of fast building of the data structures involved and detailed enough partitioning. This is the best resource I can find: http://www.codercorner.com/SAP.pdf If anyone has any suggestions whether or not I'm going in the right direction, please let me know.

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• How can I upgrade my server's kernel without rebooting?

  - by Oli

  This is a loaded question because I'm already aware of, and am very interested in ksplice. The problem is that since they were bought by Oracle, they have been forced to pull numerous server distributions from the offerings. The answer isn't as simple as it once was. I noticed a question on Unix.SE that states: You can build your own ksplice patches to dynamically load into your own kernel Great! But how?! I've installed the free ksplice package in the repo on my desktop (not ksplice-uptrack which is non-free) and now want to generate and apply updates. What's the process? Are there any scripts out there to automate the process? Moreover, if all the machinery required for rebootless upgrades is sitting there in the kernel (and ksplice package), why on earth aren't we taking advantage of it by default? Note 1: I am happy for a solution beside ksplice but it has to deliver the same thing: rolling updates to the kernel that can be applied without rebooting the server. Note 2: I'll say it again; the main ksplice "service" does not support Ubuntu Server. It used to but it doesn't any more. When I talk about wanting to use ksplice, I'm talking about the open source tools in the ksplice package. Any answer that talks about ksplice-uptrack is probably not what I'm after as this is the part that integrates directly with aforementioned "service".

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• Incorrect viewport on monitor everytime computer is booted

  - by dolderto

  Hello, Every time I turn on my PC the viewport isn't aligned correctly on the screen - there is always a black strip on the right hand side. This is not a big issue as it can be resolved by pressing the menu button on the screen and doing a factory reset. However it is irritating having to do it every time. I am using a flat screen monitor with vga connections. The weird thing it never used to happen before with the tower Im using. Is potentially out of date drivers a problem? Thanks.

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• Change desktop background at school

  - by Nano8Blazex

  On school computers, I can log in with a user account stored on the school network (something like that, I have no experience in networking and this sort of stuff). Everything is fine and dandy and totally works as it should, but there is one thing that I find annoying. Apparently for some reason I can't change my background to anything more than a couple of different solid colors with our school's logo still stuck in the middle. (the original background is a white logo on black background. If I change it to a different color, the central 6x6 inch black/white logo still remains, only the surrounding color is changed.) It may have been set by school administrators or something, I don't really know. I find this really ugly. Is there any way to change a setting so that I can set the background to any picture I wish? (like on a home pc...) Thanks.

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• What are functional-programming ways of implementing Conway's Game of Life

  - by George Mauer

  I recently implemented for fun Conway's Game of Life in Javascript (actually coffeescript but same thing). Since javascript can be used as a functional language I was trying to stay to that end of the spectrum. I was not happy with my results. I am a fairly good OO programmer and my solution smacked of same-old-same-old. So long question short: what is the (pseudocode) functional style of doing it? Here is Pseudocode for my attempt: class Node update: (board) -> get number_of_alive_neighbors from board get this_is_alive from board if this_is_alive and number_of_alive_neighbors < 2 then die if this_is_alive and number_of_alive_neighbors > 3 then die if not this_is_alive and number_of_alive_neighbors == 3 then alive class NodeLocations at: (x, y) -> return node value at x,y of: (node) -> return x,y of node class Board getNeighbors: (node) -> use node_locations to check 8 neighbors around node and return count nodes = for 1..100 new Node state = new NodeState(nodes) locations = new NodeLocations(nodes) board = new Board(locations, state) executeRound: state = clone state accumulated_changes = for n in nodes n.update(board) apply accumulated_changes to state board = new Board(locations, state)

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• Can I use PLink and Pageant with Cygwin's ssh?

  - by Jerph

  I'm now using msysgit because of the GUI tools, which use Putty's Pageant and PLink utilities, but I use Cygwin as a general SSH terminal. I had been using ssh-agent on Cygwin, but that means I have to enter my SSH key passphrases for both SSH key managers. Is it possible to configure all my Unix-port tools (msys, git, cygwin, Ruby Net:SSH, etc.) to use PLink/Pageant instead of ssh-agent? It seems that's the kind of thing PLink was made for, but I can't find documentation on how.

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• Statistical Software Quality Control References

  - by Xodarap

  I'm looking for references about hypothesis testing in software management. For example, we might wonder whether "crunch time" leads to an increase in defect rate - this is a surprisingly difficult thing to do. There are many questions on how to measure quality - this isn't what I'm asking. And there are books like Kan which discuss various quality metrics and their utilities. I'm not asking this either. I want to know how one applies these metrics to make decisions. E.g. suppose we decide to go with critical errors / KLOC. One of the problems we'll have to deal with with that this is not a normally distributed data set (almost all patches have zero critical errors). And further, it's not clear that we really want to examine the difference in means. So what should our alternative hypothesis be? (Note: Based on previous questions, my guess is that I'll get a lot of answers telling me that this is a bad idea. That's fine, but I'd request that it's based on published data, instead of your own experience.)

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• Game editor integration with the engine?

  - by Daniel

  What I am trying to figure out is what is the best way to integrate the editor(level, effects, model, etc...) in the most effective way? Now the first thing I thought would be to create the game engine(*) extremely modular. For example I took the example of game states. You could have multiple game states that all have their own update() and draw() methods among others. Each game state class would inherit from a base GameState class. This allows for a more modular approach and a useful one at that. Now would the most efficient approach be to implement the editor along with the modular engine, or create two different designs for both the game, and editor? I thought to take the game state example and extend it to window states, and well could be used for a lot more systems. Is there a better implementation of this design(game state) for use in other systems used in the engine? *: Now I know the term game engine is sorta irrelevant, and misused in many situations. What I am referring to as the "game engine" is the combination of the systems that the game must interact with for short. Also this is more of a theory / design question than an implementation. Even though both mix, i'd rather like to have a more general idea on how the editor is built in an efficient way and still using the same engine code as what the game uses. Thanks, Daniel P.S If you need more clarification or extra bits just leave a comment.

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• Why do I get a My Disney window when installing VMWare Workstation?

  - by Marc Esher

  I'm assuming this is a virus, though my virus checker can't find it. I downloaded the latest vmware workstation 7 installer. I'm running Windows 7 64bit. I go to install it, and the installer window is a Disney website. Upon further investigation, what's happening is that the vmware installer extracts/writes a bunch of files to a temp directory. One of those files is an index.htm file. When I open it, sure enough it's the Disney file. I used sysinternals Process Monitor to look for anything fishy, but the only thing I see touching that index.htm file is the vmware installer and explorer.exe

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• Network architecture when using Rackspace's Cloud

  - by brianz

  I'm planning on launching a web application soon, and have decided on using Rackspace's Cloud offering with Debian. I'm not expecting that much traffic to start, but would rather get the architecture correct now even with the small VPSs. The thing I'm not quite sure about is how many VPSs I should get. At a minimum, I know I'll want three VPSs: Two Apache webservers One server for MySQL I'd also like: Nginx load balancer MySQL replication memcached I'm not sure where those last three processes should be running. Can the load balancer run on the same machine as the MySQL slave, or should they each run on their own machine? Does memcached run alongside the webservers or on different machines?

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• How to use multiple dns?

  - by Enrichman

  When I connect at work the net is going to assign me a dns that is working fine. After that when I connect to VPN I'm going to receive a different dns. With this one I can reach the server of the vpn owner but I'm not able to go to the internet. BUT if I switch the dns with the old ones I'm able to surf again (still connected to the vpn, but I cannot surf their server). Recap: DNS1) MyPC - CompanyProxy - Internet DNS2) MyPc - CompanyProxy - VPN - NoInternet (can Ping vpn servers) DNS1) MyPC - CompanyProxy - VPN - Internet (cannot ping vpn servers) Weirdest thing: I'm able to do a nslookup from anywhere, but ping is going to fail. Is possible to use both DNS? Or setup a dns just on the browser? I'm quite lost..

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• Creating a newspaper that effects the game's economy?

  - by zardon

  I am writing a game in Objective C/cocos2d where a newspaper is a central part of what controls or rather effects the game's world economy as well as what a city might do (such as increase X, reduce Y) The newspaper is a bit like a "Chance card" in Monopoly, it has an effect on something. My question is, what is the best way to do write a newspaper that has both a random and specific effect within the game. Would the best strategy be to write out all the things a newspaper can affect, a PLIST of headlines (with placeholders). I think Tiny Tower uses a PLIST of events and it randomly picks an event, but I'm not sure how it actually parses it because certain events do different things. But then how do I parse all the scenarios that a newspaper can deliver? A big switch statement seems very long and complicated to do. I am wondering if there is a simpler way to handle this kind of thing. Related to this is that there might be no news that day and I'm not sure what the newspaper should display, should it just display the last headline? So, in summary. 1) A newspaper generates a headline, it affects different things, such as the world economy, prices, how city reacts 2) I need the newspaper to generate headlines (although there may be days when there are no headlines at all), but I am not sure how to parse it without using a big-ass switch statement. Thanks in advance.

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• Defunct website taken over by spammer. How to stop them?

  - by Robert

  A friend of mine used to publish a small literary fiction magazine, both in print and on the web. In 2011 she announced that she was quitting, put a note on the website, and carefully unwound the subscriptions. She continued hosting the site (with all the back-issues available for free) until the beginning of this year, when she let the hosting lapse and the domain name expire. Today she discovered that some unknown person has purchased her former domain name and put up a modified version of her entire site. The design is different but all the content is the same, including all of the back-issues of the magazine (and the stories by diverse authors contained within), their cover art, news posts, and even her contact information. All the content would have been available from Archive.org, so it's no mystery how they got it. The only thing noticeably changed is a column added to the front page titled "Favorite Videos", with around 35 links to Youtube videos. The links are named things like "Video (Worry)" and "Video (Squirting)" and the videos all feature a man named Leo giving dubious advice and promoting his life-coaching website. Here's one of the suspect videos. There does not appear to be any connection between the content of the videos and my friend or her magazine. I also posted to the Security StackExchange to ask why someone would do this and what the security risks are to her. What I want to know here is, what can she do to stop them? To be clear she doesn't want the domain name back. She just doesn't want her name and copyrighted material used deceptively. Also, what (if anything) could she have done when shutting down her website to avoid this happening?

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• Less is more: The making of a 37 signals style pizza

  - by Liam McLennan

  For years now we have been hearing from 37 signals that the way to bake a great web app is to build less – well the same is true of pizza. Our western hedonism has led us to pursue ever cheesier and more stuffed crusts at the expense of the simple flavours. All we are left with is a fatty, salty heart attack in waiting. The Italians know that the secret to great taste is simplicity. With that in mind I decided to base my pizza masterpiece on these simple flavours: tomato sopressa (spicy aged salami) mozzarella garlic basil Of course the first thing one needs when making pizza is a base.   A freshly made base is extremely important but unfortunately I was too lazy. Next up is the tomato sauce. My wife made the sauce by reducing some tomatoes and adding herbs and sugar. We had selected some fine ingredients to make our topping: sopressa salami, fresh basil and the best mozzarella we could find.   It is, according to google, important to bake pizza at a high temperature, so I set the oven to 250C (480F). Here are the before and after shots: Meanwhile, the dog did nothing.

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• How does one escape the GPL?

  - by tehtros

  DISCLAIMER I don't pretend to know anything about licensing. In fact, everything I say below may be completely false! Backstory: Recently, I've been looking for a decent game engine, and I think I've found one that I really like, Cafu Engine. However, they have a dual licensing plan, where everything you make with the engine is forced under GPL, unless you pay for a commercial license. I'm not saying that it's a bad engine, they even say that they are very relaxed about the licensing fees. However, the fact that it even involves the GPL scares me. So my question is basicly, how does one escape the GPL. Here's an example: The id Tech engine, also known as the Quake engine, or the Doom engine, was the base for the popular Source engine. However, the id Tech engine has been released under the GPL, and the Source engine is proprietary. Did Valve get a different license? Or did they do something to escape the GPL? Is there a way to escape the GPL? Or, if you use GPL'd source code as a base for another project, are you forced to use the GPL, and make your source code available to the world. Could some random person take the id Tech engine, modify it past the point of recognition, then use it as a proprietary engine for commercial products? Or are they required to make it open source. One last thing, I generally have no problem what-so-ever with open source. However I feel that open source has it's place, but that is not in the bushiness world.

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• Better Method of Opening TTY Permissions

  - by VxJasonxV

  At work, I have a few legacy servers that I log into as root, and then su down to a user. I continue to run into an issue where after doing so, I am unable to run screen as this user. I don't want to open screen as root, because then I have to consciously su down the user every new shell, and I often forget. The question is, is there an easier resolution to this than I'm currently aware of? My current solution is to find my terminal pts number, then set it chmod 666. I'm looking for something akin to X11's xhost ACL management, if such a thing exists for this situation.

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• XNA calculate normals for linesegment

  - by Gerhman

  I am quite new to 3D graphical programming and thus far only understand that normal somehow define the direction in which a vertex faces and therefore the direction in which light is reflected. I have now idea how they are calculated though, only that they are defined by a Vector3. For a visualizer that I am creating I am importing a bunch of coordinate which represent layer upon layer of line segments. At the moment I am only using a vertex buffer and adding the start and end point of each line and then rendering a linelist. The thing is now that I need to calculate the normal for the vertices of these line segments so that I can get some realistic lighting. I have no idea how to calculate these normal but I know they all face sideways and not up or down. To calculate them all I have are the start and end positions of each line segment. The below image is a representation of what I think I need to do in the case of an example layer: The red arrows represent the normal that should be calculates, the blue text represent the coordinates of the vertices and the green numbers represent their indices. I would greatly appreciate it if someone could please explain to me how I should calculate these normal.

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