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  • How should I best store these files?

    - by Triton Man
    I have a set of image files, they are generally very small, between 5k and 100k. They can be any size though, upwards of 50mb but this is very rare. When these images are put into the system they are not ever modified. There is about 50 TB of these images total. They are currently chunked and stored in BLOBs in Oracle, but we want to change this since it requires special software to extract them. These images are access sometimes at a rate of over 100 requests per second among about 10 servers. I'm thinking about Hadoop or Cassandra, but I really don't know which would be best or how best to index them.

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  • "javascript: void(0)" links sometimes break event handlers in internet explorer

    - by internet man
    A while back I ran in to a problem where after clicking an anchor with "javascript: void(0)" events just stopped firing. I read that following a link puts the page in a different state and in that different state events don't fire. Even though the link is not real, it sometimes confuses IE. Anyway, I removed the "javascript: void(0)"'s and the problem has not been seen again. Now, in a different application I am seeing the same thing... kinda. Clicking the "javascript: void(0)" sometimes has no ill effect. But then for some reason or another after clicking the bad link the page will stop working. Once this happens it will continue to happen consistently until the client machine is rebooted. After reboot, you are back to it sometimes happening. Crazy right? Reboot fixing a web page!?!?! So, my question is has anyone seen this before? Can anyone give an explanation for this issue? Any documentation on this issue? I can't seem to find anything on it again. Does this even make sense? I already know "javascript: void(0)" is bad practice... I am just looking to understand the issue. Specifically, this is IE7. Thanks for reading!

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  • php random image file name

    - by bush man
    Okay im using a snippet I found on google to take a users uploaded image and put it in my directory under Content But Im worried about duplicates so I was going have it upload the image as a Random number well here is my code you can probably understand what im going for through it anyways <label for="file">Profile Pic:</label> <input type="file" name="ProfilePic" id="ProfilePic" /><br /> <input type="submit" name="submit" value="Submit" /> $ProfilePicName = $_FILES["ProfilePic"]["name"]; $ProfilePicType = $_FILES["ProfilePic"]["type"]; $ProfilePicSize = $_FILES["ProfilePic"]["size"]; $ProfilePicTemp = $_FILES["ProfilePic"]["tmp_name"]; $ProfilePicError = $_FILES["ProfilePic"]["error"]; $RandomAccountNumber = mt_rand(1, 99999); echo $RandomAccountNumber; move_uploaded_file($ProfilePicTemp, "Content/".$RandomAccountNumber.$ProfilePicType); And then basicly after all this Im going try to get it to put that random number in my database

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  • Developer’s Life – Summary of Superhero Articles

    - by Pinal Dave
    Earlier this year, I wrote an article series where I talked about developer’s life and compared it with Superhero. I have got amazing response to this series and I have been receiving quite a lots of email suggesting that I should write more blog post about them. Currently I am not planning to write more blog post but I will soon continue another series. In this blog post, I have summarized the entire series. Let me know if you want me to write about any superhero. I will see what I can do about that hero. Developer’s Life – Every Developer is a Captain America Captain America was first created as a comic book character in the 1940’s as a way to boost morale during World War II.  Aimed at a children’s audience, his legacy faded away when the war ended.  However, he has recently has a major reboot to become a popular movie character that deals with modern issues. Developer’s Life – Every Developer is the Incredible Hulk The Incredible Hulk is possibly one of the scariest superheroes out there.  All superheroes are meant to be “out of this world” and awe-inspiring, but I think most people will agree with I say The Hulk takes this to the next level.  He is the result of an industrial accident, which is scary enough in it’s own right.  Plus, when mild-mannered Bruce Banner is angered, he goes completely out-of-control and transforms into a destructive monster that he cannot control and has no memories of. Developer’s Life – Every Developer is a Wonder Woman We have focused a lot lately on this “superhero series.”  I love fantasy books and movies, and I feel like there is a lot to be learned from them.  As I am writing this series, though, I have noticed that every super hero I write about is a man.  So today, I would like to talk about the major female super hero – Wonder Woman. Developer’s Life – Every Developer is a Harry Potter Harry Potter might not be a superhero in the traditional sense, but I believe he still has a lot to teach us and show us about life as a developer.  If you have been living under a rock for the last 17 years, you might not know that Harry Potter is the main character in an extremely popular series of books and movies documenting the education and tribulation of a young wizard (and his friends). Developer’s Life – Every Developer is Like Transformers Transformers may not be superheroes – they don’t wear capes, they don’t have amazing powers outside of their size and folding ability, they’re not even human (technically).  Part of their enduring popularity is that while we are enjoying over-the-top movies, we are learning about good leadership and strong personal skills. Developer’s Life – Every Developer is a Iron Man Iron Man is another superhero who is not naturally “super,” but relies on his brain (and money) to turn him into a fighting machine.  While traditional superheroes are still popular, a three-movie franchise and incorporation into the new Avengers series shows that Iron Man is popular enough on his own. Developer’s Life – Every Developer is a Sherlock Holmes I have been thinking a lot about how developers are like super heroes, and I have written two blog posts now comparing them to Spiderman and Superman.  I have a lot of love and respect for developers, and I hope that they are enjoying these articles, and others are learning a little bit about the profession.  There is another fictional character who, while not technically asuper hero, is very powerful, and I also think stands as a good example of a developer. That character is Sherlock Holmes.  Sherlock Holmes is a British detective, first made popular at the turn of the 19thcentury by author Sir Arthur Conan Doyle.  The original Sherlock Holmes was a brilliant detective who could solve the most mind-boggling crime through simple observations and deduction. Developer’s Life – Every Developer is a Chhota Bheem Chhota Bheem is a cartoon character that is extremely popular where I live.  He is my daughter’s favorite characters.  I like to say that children love Chhota Bheem more than their parents – it is lucky for us he is not real!  Children love Chhota Bheem because he is the absolute “good guy.”  He is smart, loyal, and strong.  He and his friends live in Dholakpur and fight off their many enemies – and always win – in every episode.  In each episode, they learn something about friendship, bravery, and being kind to others.  Chhota Bheem is a good role model for children, and I think that he is a good role model for developers are well. Developer’s Life – Every Developer is a Batman Batman is one of the darkest superheroes in the fantasy canon.  He does not come to his powers through any sort of magical coincidence or radioactive insect, but through a lot of psychological scarring caused by witnessing the death of his parents.  Despite his dark back story, he possesses a lot of admirable abilities that I feel bear comparison to developers. Developer’s Life – Every Developer is a Superman I enjoyed comparing developers to Spiderman so much, that I have decided to continue the trend and encourage some of my favorite people (developers) with another favorite superhero – Superman.  Superman is probably the most famous superhero – and one of the most inspiring. Developer’s Life – Every Developer is a Spiderman I have to admit, Spiderman is my favorite superhero.  The most recent movie recently was released in theaters, so it has been at the front of my mind for some time. Spiderman was my favorite superhero even before the latest movie came out, but of course I took my whole family to see the movie as soon as I could!  Every one of us loved it, including my daughter.  We all left the movie thinking how great it would be to be Spiderman.  So, with that in mind, I started thinking about how we are like Spiderman in our everyday lives, especially developers. I would like to know which Superhero is your favorite hero! Reference: Pinal Dave (http://blog.SQLAuthority.com)Filed under: PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL Tagged: Developer, Superhero

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  • Enable remote VNC from the commandline?

    - by Stefan Lasiewski
    I have one computer running Ubuntu 10.04, and is running Vino, the default VNC server. I have a second Windows box which is running a VNC client, but does not have any X11 capabilities. I am ssh'd into the Ubuntu host from the Windows host, but I forgot to enable VNC access on the Ubuntu host. On the Ubuntu host, is there a way for me to enable VNC connections from the Ubuntu commandline? Update: As @koanhead says below, there is no man page for vino (e.g. man -k vino and info vino return nothing), and vino --help doesn't show any help).

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  • Tears of Steel [Short Movie]

    - by Asian Angel
    In the future a young couple reach a parting of the ways because the young man can not handle the fact that she has a robotic arm. The bitterness of the break-up and bad treatment from her fellow humans lead to a dark future 40 years later where robots are relentlessly hunting and killing humans. Can the man who started her down this dark path redeem himself and save her or will it all end in ruin? TEARS OF STEEL – DOWNLOAD & WATCH [Original Blog Post & Download Links] Tears of Steel – Blender Foundation’s fourth short Open Movie [via I Love Ubuntu] HTG Explains: What is the Windows Page File and Should You Disable It? How To Get a Better Wireless Signal and Reduce Wireless Network Interference How To Troubleshoot Internet Connection Problems

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  • What units does the ntp drift file use?

    - by arielf
    When the ntpd daemon is running, the file: /var/lib/ntp/ntp.drift gets updated periodically. Example: 17:20 hostname 118 ~> ls -l /var/lib/ntp/ntp.drift -rw-r--r-- 1 ntp ntp 7 May 20 16:46 /var/lib/ntp/ntp.drift # So it looks like it was last updated ~34 minutes ago The file has one number in it, for example, looking at a 4 virtual hosts, I find these values, respectively: -22.086 -10.214 -13.669 6.045 I assume these are seconds per day(?), but not sure. man ntpd mentions a different drift file /etc/ntp.drift which doesn't seem to exist. The man page doesn't explain what units are being used for the drift. Questions: Is /etc/ntp.drift actually /var/lib/ntp/ntp.drift on Ubuntu? What units is the drift expressed in? Thanks!

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  • Oracle ODP.NET und Windows PowerShell

    - by cjandaus
    In der Microsoft Welt wohlbekannt, in der Oracle Welt nur ein Schulterzucken hervorrufend - die sogenannten Scripting Guys. Wie der Name bereits vermuten lässt, geht es in deren Hey, Scripting Guy! Blog um Scripting. Und damit natürlich um die Windows PowerShell. Ja, die Zeiten des DOS-Kommandofensters und Batch-Dateien ist vorbei. Die PowerShell ist eine mächtige Scripting-Umgebung unter Windows, die selbst unter Unix/Linux-Administratoren Gefallen finden sollte. Dass man damit wunderbar auch auf Oracle Datenbanken zugreifen kann, haben wir bereits vor Jahren in einer Oracle Workshop Reihe bewiesen. Damals begleitete mich Klaus Rohe von Microsoft, der mit mir dann auch gemeinsam einen Vortrag auf DOAG Konferenz hielt. Unser gemeinsames Ziel war es damals wie heute, die Oracle Anwender von der hervorragenden Integration zwischen Oracle, Windows und .NET zu überzeugen. Was lag näher, als sich dies von beiden Herstellern gemeinsam bestätigen zu lassen? Vor allem die ewigen Zweifler begrüßten dies. Seither war die PowerShell bei mir nicht mehr auf dem Radar und auch Oracle Anwender haben das Thema nicht mehr aufgeworfen. Möglicherweise auch deshalb, weil es zu neu oder zu unbekannt ist? Eher unwahrscheinlich ... Vielleicht liegt es vielmehr daran, dass man einfach mal davon ausgeht, dass PowerShell nur für Microsoft Produkte richtig nutzbar ist? Oder man bekommt erzählt, dass nur die Integration mit der Microsoft-eigenen Datenbank SQL Server möglich ist? Und das ist natürlich nicht richtig - so wie immer (ich denke dabei unter anderem an das Microsoft Active Directory - aber dazu ein andermal mehr). Umso mehr freut es mich, einen brandneuen Blog-Beitrag zu genau diesem Thema zu lesen, auf den mich Alex Keh, (Produkt Manager für Windows und .NET im Oracle Headquarter in San Francisco) aufmerksam gemacht hat. Was die Sache noch besser macht, dieser Beitrag stammt aus der Microsoft Welt und belegt damit zwischen den Zeilen, dass die Oracle Datenbank und unsere .NET Integration via dem Oracle Data Provider for .NET (ODP.NET) auch hier eine bedeutende Rolle spielt. In diesem Sinne: Beide Daumen hoch für die Scripting Guys! Der Beitrag nennt sich Use Oracle ODP.NET and PowerShell to Simplify Data Access und trotz ein paar weniger Ausreißer, ist der Artikel sehr zu empfehlen, um in das Thema einzusteigen. Lassen Sie es mich wissen, wie Sie zu dieser Integration stehen, ob die PowerShell für Sie in der Praxis wichtig ist oder werden könnte, und falls Sie Features vermissen, die Oracle künftig umsetzen sollte. Danke!

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  • What are the drawbacks of Python?

    - by Rook
    Python seems all the rage these days, and not undeservingly - for it is truly a language with which one almost enjoys being given a new problem to solve. But, as a wise man once said (calling him a wise man only because I've no idea as to who actually said it; not sure whether he was that wise at all), to really know a language one does not only know its syntax, design, etc., advantages but also its drawbacks. No language is perfect, some are just better than others. So, what would be in your opinion, objective drawbacks of Python. Note: I'm not asking for a language comparison here (i.e. C# is better than Python because ... yadda yadda yadda) - more of an objective (to some level) opinion which language features are badly designed, whether, what are maybe some you're missing in it and so on. If must use another language as a comparison, but only to illustrate a point which would be hard to elaborate on otherwise (i.e. for ease of understanding)

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  • How can I move along an angled collision at a constant speed?

    - by Raven Dreamer
    I have, for all intents and purposes, a Triangle class that objects in my scene can collide with (In actuality, the right side of a parallelogram). My collision detection and resolution code works fine for the purposes of preventing a gameobject from entering into the space of the Triangle, instead directing the movement along the edge. The trouble is, the maximum speed along the x and y axis is not equivalent in my game, and moving along the Y axis (up or down) should take twice as long as an equivalent distance along the X axis (left or right). Unfortunately, these speeds apply to the collision resolution too, and movement along the blue path above progresses twice as fast. What can I do in my collision resolution to make sure that the speedlimit for Y axis movement is obeyed in the latter case? Collision Resolution for this case below (vecInput and velocity are the position and velocity vectors of the game object): // y = mx+c lowY = 2*vecInput.x + parag.rightYIntercept ; ... else { // y = mx+c // vecInput.y = 2(x) + RightYIntercept // (vecInput.y - RightYIntercept) / 2 = x; //if velocity.Y (positive) greater than velocity.X (negative) //pushing from bottom, so push right. if(velocity.y > -1*velocity.x) { vecInput = new Vector2((vecInput.y - parag.rightYIntercept)/2, vecInput.y); Debug.Log("adjusted rightwards"); } else { vecInput = new Vector2( vecInput.x, lowY); Debug.Log("adjusted downwards"); } }

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  • How to create per-vertex normals when reusing vertex data?

    - by Chris Smith
    I am displaying a cube using a vertex buffer object (gl.ELEMENT_ARRAY_BUFFER). This allows me to specify vertex indicies, rather than having duplicate vertexes. In the case of displaying a simple cube, this means I only need to have eight vertices total. Opposed to needing three vertices per triangle, times two triangles per face, times six faces. Sound correct so far? My question is, how do I now deal with vertex attribute data such as color, texture coordinates, and normals when reusing vertices using the vertex buffer object? If I am reusing the same vertex data in my indexed vertex buffer, how can I differentiate when vertex X is used as part of the cube's front face versus the cube's left face? In both cases I would like the surface normal and texture coordinates to be different. I understand I could average the surface normal, however I would like to render a cube. Also, this still doesn't work for texture coordinates. Is there a way to save memory using a vertex buffer object while being able to provide different vertex attribute data based on context? (Per-triangle would be idea.) Or should I just duplicate each vertex for each context in which it gets rendered. (So there is a one-to-one mapping between vertex, normal, color, etc.) Note: I'm using OpenGL ES.

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  • The Information Driven Value Chain - Part 1

    - by Paul Homchick
    One hundred years ago, there were places on Earth that no man had ever seen.  Today, a man standing in one of those places can instantaneously communicate with someone who may be strolling down the street on his way to lunch half way around the globe.  Our world is shrinking and becoming virtual. It is a world of incredible bounty and speed where we can get a product delivered to us anywhere on earth within a day or two. However, this world is also one of challenge where volatility, uncertainty, risk and chaos are our daily companions. To prosper amid the realities of this new world, the enterprise needs a business model. Globalization and instant communications demand greater operational flexibility than ever before. Extended supply chains have elevated the management of risk to a central concern, and regulatory demands from multiple governments place an increasing burden of compliance on companies. Finally, the speed of today's business requires continuous innovation to keep from falling behind the global competition.

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  • What are the default mount settings for mount / fstab?

    - by John Craick
    What are the default mounting options for a non root partition ? The man entry for mount says ... defaults - use default options: rw, suid, dev, exec, auto, nouser, and async. ... so that might be what we expect to see. But, unless I'm missing something, that's not what happens. I have an ext3 partition labelled "NewHome20G" which is seen as /dev/sdc6 by the system. This we can see from ... root@john-pc1204:~# blkid | grep NewHome20G /dev/sdc6: LABEL="NewHome20G" UUID="d024bad5-906c-46c0-b7d4-812daf2c9628" TYPE="ext3" I have an entry in fstab as follows ... root@john-pc1204:~# cat /etc/fstab | grep NewHome LABEL=NewHome20G /media/NewHome20G ext3 rw,nosuid,nodev,exec,users 0 2 Note the option settings that are specified in that fstab line. Now I look at how the partition is actually mounted after boot up ... root@john-pc1204:~# mount -l | grep sdc6 /dev/sdc6 on /media/NewHome20G type ext3 (rw,noexec,nosuid,nodev) [NewHome20G] ... so, when the filesystem gets mounted the exec & users options I specified seem to have been ignored. Just to be sure, I unmount sdc6, remount it and look at the mount options again ... root@john-pc1204:~# umount /dev/sdc6 root@john-pc1204:~# mount /dev/sdc6 root@john-pc1204:~# mount -l | grep sdc6 /dev/sdc6 on /media/NewHome20G type ext3 (rw,noexec,nosuid,nodev) [NewHome20G] .... same result Now I unmount the partition again, remount it specifying the exec option and look at the result ... root@john-pc1204:~# umount /dev/sdc6 root@john-pc1204:~# mount /dev/sdc6 -o exec root@john-pc1204:~# mount -l | grep sdc6 /dev/sdc6 on /media/NewHome20G type ext3 (rw,nosuid,nodev) [NewHome20G] ... and here the exec option has finally taken effect and the noexec setting has vanished. Just for interest, I re-mount the partition with the defaults option root@john-pc1204:~# umount /dev/sdc6 root@john-pc1204:~# mount /dev/sdc6 -o defaults root@john-pc1204:~# mount -l | grep sdc6 /dev/sdc6 on /media/NewHome20G type ext3 (rw,noexec,nosuid,nodev) [NewHome20G] The noexec is back, so it looks very like rw,noexec,nosuid,nodev are the default options which is NOT what man says. Why does this matter ? I have a folder full of useful scripts stored on a data disk. Because that disk is mounted noexec those scripts won't run, even though they have all been set with chmod 777. I can work round this in several ways but it's disappointing that the man entry seems to be wrong. Have I missed something obvious here or have the default options in Ubuntu changed from what they were a few versions ago ?

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  • Liverpool: Transfer Predictions

    - by BizTalk Visionary
    Some simple predictions based on one fact: Rafa Benitez stays at Liverpool 1. Torres leaves for 60 million – destination Man City 2. Gerrard leaves for 30 million – destination Real Madrid – Mourinho gets his man   3. Mascherano leaves for 25 million – destination Spain 4. Riera leaves for who knows where – 10 million 5. Aquilani leaves for who knows whre – 12 million 6. Yanks pay off 100 million of debt 7. Yanks give Rafa 37 million to spend – Rafa buys another load of dross from Spain, Italy and else where! That's it!

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  • Illumination and Shading for computer graphics class

    - by Sam I Am
    I am preparing for my test tomorrow and this is one of the practice questions. I solved it partially but I am confused with the rest. Here is the problem: Consider a gray world with no ambient and specular lighting ( only diffuse lighting). The screen coordinates of a triangle P1,P2,P3, are P1=(100,100), P2= (300,150), P3 = (200, 200). The gray values at P!,P2,P3 are 1/2, 3/4, and 1/4 respectively. The light is at infinity and its direction and gray color are (1,1,1) and 1.0 respectively. The coefficients of diffused reflection is 1/2. The normals of P1,P2,P3 are N1= (0,0,1), N2 = (1,0,0), and N3 = (0,1,0) respectively. Consider the coordinates of three points P1,P2,P3 to be 0. Do not normalize the normals. I have computed that the illumination at the 3 vertices P1,P2,P3 is (1/4,3/8,1/8). Also I computed that interpolation coefficients of a point P inside the triangle whose coordinates are (220, 160) are given by (1/5,2/5,2/5). Now I have 4 more questions regarding this problem. 1) The illumination at P using Gouraud Shading is: i) 1/2 The answer is 1/2, but I have no idea how to compute it.. 2) The interpolated normal at P is given by i) (2/5, 2/5,1/5) ii) (1/2, 1/4, 1/4) iii) (3/5, 1/5, 1/5) 3) The interpolated color at P is given by: i) 1/2 Again, I know the correct answer but no idea how to solve it 4) The illumination at P using Phong Shading is i) 1/4 ii) 9/40 iii) 1/2

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  • How to get working cups command line tools on Server 14.04

    - by Nick
    It looks like some of the commands like lpr and lprm have broken versions that don't work with cups. These commands worked properly on 10.04. lpr for cups has an -o option, but no lpr is intalled when cups is installed, and the lpr installed with apt-get install lpr does not have the -o option and does not appear to be the cups version of lpr. man lpr shows BSD General Commands Manual at the top, where man lpr on the Ubuntu 10.04 server said Apple, inc in the same spot. which leads me to believe the "wrong" lpr is in the "lpr" package or package names got moved around. There is also a lprng package, but trying to install it wants to remove cups and cups-client. lprm also returns lprm: PrinterName: unknown printer when PrinterName is in fact a valid printer installed with cups and does appear in lpstat -t. How do I get the proper cups versions of lpr working on Server 14.04?

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  • Some Oracle VM 3 updates

    - by wcoekaer
    Today we did another patch set update for Oracle VM 3 (3.0.3-build 227). This can be downloaded from My Oracle Support as patch ID 14736185. There are quite a few updates in here and I highly recommend any Oracle VM 3 customer or user to install this update. This patch can be installed on top of Oracle VM 3.0 versions 3.0.2 and 3.0.3. The patch is cumulative for 3.0.3. So if you already installed patch update 1 (3.0.3-150) then this will just be incremental on top of that and brings you to 3.0.3-build 227. There is a readme file which contains the patchlist in the patch info. The following patches are released on ULN for Oracle VM server 3.0 : initscripts-8.45.30-2.100.18.el5.x86_64 The inittab file and the /etc/init.d scripts. kernel-ovs-2.6.32.21-45.6.x86_64 The Linux kernel kernel-ovs-firmware-2.6.32.21-45.6.x86_64 Firmware files used by the Linux kernel osc-oracle-ocfs2-0.1.0-35.el5.noarch Oracle Storage Connect ocfs2 Plugin osc-plugin-manager-1.2.8-9.el5.3.noarch Oracle Storage Connect Plugin Infrastructure osc-plugin-manager-devel-1.2.8-9.el5.3.noarch Oracle Storage Connect Plugin Development ovs-agent-3.0.3-41.6.x86_64 Agent for Oracle VM xen-4.0.0-81.el5.1.x86_64 Xen is a virtual machine monitor xen-devel-4.0.0-81.el5.1.x86_64 Development libraries for Xen tools xen-tools-4.0.0-81.el5.1.x86_64 Various tooling for the manipulation of Xen instances Errata emails will be sent in the next few days with details on the above updates. Or you will find them here. I also did an update of my Oracle VM utilities to 0.4.0. They are also available from My Oracle Support, patch ID 14736239. These utils can be unzipped and installed on the server running Oracle VM Manager. Typically in /u01/app/oracle/ovm-manager-3/ovm_utils. There is a set of man pages in /u01/app/oracle/ovm-manager-3/ovm_utils/man/man8. There now are 6 commands : ovm_vmcontrol : VM level operations ovm_servercontrol : server level operations ovm_vmdisks : virtual disk/physical location mapping for VM disks ovm_vmmessage : message passing utility between the manager and the VM tools (in the Oracle VM templates) ovm_repocontrol : repository level operations ovm_poolcontrol : pool level operations Some of the new changes : at a pool level, acknowledge events and cascade to servers and virtual machines with outstanding events at a pool level, do a rescan of the storage for fibrechannel/iscsi disks if you add new devices (it does this operation then on every running server) at a repository level, fixup a device if it had a failed create repository at a repository level, refresh the repository and this will update the free space in the UI for ocfs2 repositories at a server level, acknowledge server events and cascade to virtual machines if needed at a VM level, acknowledge VM events at a VM level, bind vcpus to cores with vcpuset/vcpuget Please see the man pages and remember that these tools are just written As Is - no SRs... (per the documentation) Hopefully they are useful.

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  • How can I resolve collisions at different speeds, depending on the direction?

    - by Raven Dreamer
    I have, for all intents and purposes, a Triangle class that objects in my scene can collide with (In actuality, the right side of a parallelogram). My collision detection and resolution code works fine for the purposes of preventing a gameobject from entering into the space of the Triangle, instead directing the movement along the edge. The trouble is, the maximum speed along the x and y axis is not equivalent in my game, and moving along the Y axis (up or down) should take twice as long as an equivalent distance along the X axis (left or right). Unfortunately, these speeds apply to the collision resolution too, and movement along the blue path above progresses twice as fast. What can I do in my collision resolution to make sure that the speedlimit for Y axis movement is obeyed in the latter case? Collision Resolution for this case below (vecInput and velocity are the position and velocity vectors of the game object): // y = mx+c // solve for y. M = 2, x = input's x coord, c = rightYIntercept lowY = 2*vecInput.x + parag.rightYIntercept ; ... else { // y = mx+c // vecInput.y = 2(x) + RightYIntercept // (vecInput.y - RightYIntercept) / 2 = x; //if velocity.Y (positive) greater than velocity.X (negative) //pushing from bottom, so push right. if(velocity.y > -1*velocity.x) { //change the input vector's x position to match the //y position on the shape's edge. Formula for line: Y = MX+C // M is 2, C is rightYIntercept, y is the input y, solve for X. vecInput = new Vector2((vecInput.y - parag.rightYIntercept)/2, vecInput.y); Debug.Log("adjusted rightwards"); } else { vecInput = new Vector2( vecInput.x, lowY); Debug.Log("adjusted downwards"); } }

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  • Rendering different materials in a voxel terrain

    - by MaelmDev
    Each voxel datapoint in my terrain model is made up of two properties: density and material type. Each is stored as an unsigned integer value (but the density is interpreted as a decimal value between 0 and 1). My current idea for rendering these different materials on the terrain mesh is to store eleven extra attributes in each vertex: six material values corresponding to the materials of the voxels that the vertices lie between, three decimal values that correspond to the interpolation each vertex has between each voxel, and two decimal values that are used to determine where the fragment lies on the triangle. The material and interpolation attributes are the exact same for each vertex in the triangle. The fragment shader samples each texture that corresponds to each material and then uses the aforementioned couple of decimal values to interpolate between these samples and obtain the final textured color of the fragment. It should work fine, but it seems like a big memory hog. I won't be able to reuse vertices in the mesh with indexing, and each vertex will have a lot of data associated with it. It also seems pretty slow. What are some ways to improve or replace this technique for drawing materials on a voxel terrain mesh?

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  • 8 Bit Beats – Video Game Themes Remixed

    - by Jason Fitzpatrick
    What do you get when you cross classic video game themes with a club beat? These Subwoofer-maxing remixes take Link and Mario to the dance floor. Courtesy of NickplosionFX, the above video remixes The Legend of Zelda and Pac-Man with a healthy dose of back beat. Other offerings from 8 Bit Beats include a Super Mario Bros. 3 remix. Have a source for other great video game remixes? Sound off in the comments. 8 Bit Beats – Zelda/Pac-Man [YouTube] What To Do If You Get a Virus on Your Computer Why Enabling “Do Not Track” Doesn’t Stop You From Being Tracked HTG Explains: What is the Windows Page File and Should You Disable It?

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  • Enable remote VNC from the commandline?

    - by Stefan Lasiewski
    I have one computer running Ubuntu 10.04, and is running Vino, the default VNC server. I have a second Windows box which is running a VNC client, but does not have any X11 capabilities. I am ssh'd into the Ubuntu host from the Windows host, but I forgot to enable VNC access on the Ubuntu host. On the Ubuntu host, is there a way for me to enable VNC connections from the Ubuntu commandline? Update: As @koanhead says below, there is no man page for vino (e.g. man -k vino and info vino return nothing), and vino --help doesn't show any help).

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