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• Question about server usage, big community platform

  - by Json

  I’m working on a community platform writen in PHP, MySQL. I have some questions about the server usage maybe someone can help me out. The community is based on JQuery with many ajax requests to update content. It makes 5 - 10 AJAX(Json, GET, POST) requests every 5 seconds, the requests fetch user data like user notifications and messages by doing mySQL queries. I wonder how a server will handle this when there are for more than 5000 users online. Then it will be 50.000 requests every 5 seconds, what kind of server you need to handle this? Or maybe even more, when there are 15.000 users online, 150.000 requests every 5 seconds. My webserver have the following specs. Xeon Quad 2048MB 5000GB traffic Will it be good enough, and for how many users? Anyone can help me out or know where to find such information, like make a calculation?

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• Can't install Ubuntu in a HP DV6 Laptop

  - by EApubs

  I just bought an HP DV6 6011tx (link) Laptop... I formated the disk through Windows and prepared for installing Ubuntu... When I insert the live CD, it shows the ubuntu start screen and then everything goes black (no cursor... Just like the screen is switched off (but the system is working)) When i try to install from the USB, it says Live media is not found! Some times it also give a black screen like the CD... Have any idea how to fix this? Thanks

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• Silverlight Rough Cut Editor Real Time Highlights

  The NAB Show is an annual trade show produced by the National Association of Broadcasters. It is taking place in Las Vegas this week and you can check out Microsoft at the NAB Show 2010. It is interesting to watch the broadcast and web industry collide converge head on. With the launch of Silverlight 4 this morning one could say this week is a perfect storm. The media press releases from Microsoft are coming thick and fast. REDMOND, Wash. April 8, 2010 Microsoft Corp. today announced that...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• vlc issue with unity

  - by bob

  I'm using ubuntu 12.04 with unity 3d. I am having troubles to lock vlc (version: VLC media player 2.0.1 Twoflower (revision 2.0.1-0-gf432547)) to the left panel. It doesn't behave the same way other applications do. This is a fresh install from the repo, I didn't change any settings. Ubuntu 12.04 is also a fresh install. For example, (left) clicking on it doesn't bring it to front, but creates a new instance (this in particular is very annoying, if it gets behind another window, that happens to be maximized, there is no way to bring it back up). It also doesn't have a right arrow to say the number of instances there is. Any way around that ?

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• Gnome-shell video freeze

  - by josephsmendoza

  So i have a 14.04 Ubuntu Gnome Live USB on my 16GB USB 3.0. It runs fine except sometimes it the screen will freeze, but I know stuff is still happening cause I can hear media playing. I did a little digging and i'm still not sure why, can someone help? Sorry if i don't provide enough details. ubuntu-gnome@ubuntu-gnome:~$ lspci -nnk | grep -iA2 VGA 03:00.0 VGA compatible controller [0300]: NVIDIA Corporation C79 [GeForce 9400}[10de:0867] (rev b1) Subsystem: Apple Inc. iMac 9,1 [106b:00ad] Kernel driver in use: nouveau

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• Is it Considered Good SQL practice to use GUID to link multiple tables to same Id field?

  - by Mallow

  I want to link several tables to a many-to-many(m2m) table. One table would be called location and this table would always be on one side of the m2m table. But I will have a list of several tables for example: Cards Photographs Illustrations Vectors Would using GUID's between these tables to link it to a single column in another table be considered 'Good Practice'? Will Mysql let me to have it automatically cascade updates and delete? If so, would multiple cascades lead to an issues? UPDATE I've read that GUID (a hex number) Generally takes up more space in a database and slows queries down. However I could still generate 'unique' ids by just having the table initial's as part of the id so that the table card's id would be c0001, and then Illustrations be I001. Regardless of this change, the questions still stands.

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• mounting linux partition after installing windows

  - by varsketiz

  I installed windows 7 and my grub is gone. I'm trying to follow: https://help.ubuntu.com/community/RecoveringUbuntuAfterInstallingWindows but I can't mount my ubuntu partion. sudo fdisk -l Device Boot Start End Blocks Id System /dev/sda1 * 1 13 102400 7 HPFS/NTFS Partition 1 does not end on cylinder boundary. /dev/sda2 13 4863 38958080 7 HPFS/NTFS /dev/sda3 4864 14594 78157825 5 Extended /dev/sda5 14220 14594 2999296 82 Linux swap / Solaris Gparted shows my Extended partition as empty/unallocated space (???). How can I mount it? sudo mount -t ext3 /dev/sda3 /media/ubuntu mount: wrong fs type, bad option, bad superblock on /dev/sda3, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so

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• Add Custom Color Changing RGB LED Lighting to Your Next Project

  - by Jason Fitzpatrick

  While this specific project is a really neat back-lit bookcase with customizable LED lights galore, you could easily add the exact same setup to just about anything you wanted to give some LED love. The core of the project is a set of addressable LED modules, an Arduino board, and a simple bit of code. You could use it to make a 70s style mood lighting box, add color changing accents to your media room, or any other number of fun projects just by cloning this project and extending/shortening the wires where appropriate. The control module allows for solid colors, multi-colors, and animations. Hit up the link below for more information including the source code. ExpeditInvaders [via IKEAHacker] HTG Explains: What The Windows Event Viewer Is and How You Can Use It HTG Explains: How Windows Uses The Task Scheduler for System Tasks HTG Explains: Why Do Hard Drives Show the Wrong Capacity in Windows?

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• automount smb share customization

  - by Douda

  as a new linux user, used Ubuntu 12.10, I tried several tweaks with the SMB shares. I followed this tutorial to mount permanently 4 SMB shares from my local NAS. To resume, I : edit /etc/fstab added a line like : //servername/sharename /media/windowsshare cifs credentials=/home/ubuntuusername/.smbcredentials,iocharset=utf8,file_mode=0777,dir_mode=0777 0 0 created a credentials file for security reasons in my home folder (explained in the tutorial) ~/.smbcredentials It work perfectly, they are automounted on each reboot, but when I logon, I all the time get 4 file explorer open with each share. It is possible to avoid these file explorer window to be opened on every reboot ? I guess it's related to X or via a explicit deny or these graphical mount, but I don't have any clues on how to proceed Thank you for your time,

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• Le H.264 est de retour sur Chrome, qui pourra lire les vidéos dans ce format grâce à une extension de Microsoft

  Le H.264 est de retour sur Chrome, qui pourra lire les vidéos dans ce format grâce à une extension de Microsoft Mise à jour du 03.02.2011 par Katleen Il y a un petit peu moins d'un mois, Google annonçait la fin du support du codec H.264 par son navigateur Chrome, ce qui en enchantait certains et en gênait d'autres. Aujourd'hui, une alternative est possible, grâce à Microsoft (qui s'était déjà occupé du problème sous Firefox). L'éditeur de Redmond vient ainsi de dévoiler son "Windows Media Player HTML5 Extension for Chrome", qui, comme son nom l'indique, est une extension pour Chrome qui permettra la lecture de vidéos au format H.264 par les utilisateurs du navigateur d...

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• Google I/O 2012 - Gaming in the Cloud

  Google I/O 2012 - Gaming in the Cloud "Fred Sauer Many games developers are finding the easy development and deployment experience of Google App Engine ideal for building cloud based state-storage, matching making services and collaborations services. When you have a hit game, the last thing you want to do is worry about your server provisioning. App Engine has an always-free tier to get you started and then scales seamlessly to any size of usage. Game developers also use Google Cloud Storage to easily store and quickly deliver media files to clients around the world. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 1 0 ratings Time: 01:02:17 More in Science & Technology

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• What are the technial and programming requirements for writing a stealth keylogger?

  - by user970533

  I'm planning to write/code one such stealth keylogger that would bypass detection by a certain antivirus. (I don't want to name the vendor as I know how good Google queries are against StackExchange websites). I don't want to just download any keylogger from internet and try to encode it to evade detection. Writing code myself I would have the ability to make changes as I go; obscuration on both high-level and low-level language. I like control too. It seems naive but is it true that keyloggers are a thing of the past, probably because of how effective AV's have become in detecting such programs? I want some nice points on how can one easily write a robust, effective key logger preferably for a Windows environment?

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• What factors influence you to try out a new framework or tool?

  - by VirtuosiMedia

  I'm in the process of putting the final touches on an open-source framework that I hope to release in the next few months. It's something that I'd like to develop a community for and so I'm curious about what factors influence your decision to use a new framework or tool and why. Some of the specific things I'd like to know more about (feel free to add to this): Types of documentation/tutorials/instruction Community support (comments/forum) Updates (blog/social media/feeds) Look and feel of the project website design White papers/testimonials A big feature list Community size Tools Ability to contribute Project test coverage (stability/security) Level of buzz (recommended by friends or around the web) Convincing marketing copy Ideally, I'd like to have all of the above, but what specific features/qualities will carry greater weight in getting programmers to adopt something new? What says, 'This is a professional-grade project,' and what are red flags that keep you from trying it out?

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• How to secure Ubuntu for a non-technical user? (your mom)

  - by Gil

  My mother will be traveling for a while and I need to provide her with a secure laptop so she can work. A windows laptop is out of the question because: she'll be logging into dodgy hotel wireless networks and conference networks price of the windows license to install on a netbook I've installed libreoffice, media players and skype on it. Also enabled SSH so I can intervene but I am worried that I might not be in a position to do so. Possible threats: web browsing USB sticks insecure networks prone to intrusions malware SSH/VNC vulnerabilites Skype vulnerabilities All the "securing Ubuntu" guides out there assume the user has a certain level of technical knowledge but this is not the case with moms in general. If a malware can gain even user level access it might compromise her files.

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• easy visualization of usage statistics (web app)

  - by sova

  I have some usage queries for my web app's database, the results of which I want to display graphically. Is there an easy-to-use api that exists for this purpose? I want to show things like average query-time per user (a small user-base), average query time per day, and things like that. I think it would be cool to show these on a two-axis graph. I am displaying this data on my site, so a jQuery/javascript/html solution for rendering information into graphs would be ideal. Thank you :) P.S. I wasn't sure if I should ask this on SO, but I am looking more for which product to use, not how to program with it.

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• Mysql not starting - innodb not found

  - by Rob Guderian

  I have a fresh install of ubuntu 12.04 server edition and mysql server is not starting properly. I did a simple apt-get install apt-get install mysql-server But, it's failing with this error message root@test:~# mysqld 120618 20:57:32 [Warning] The syntax '--log-slow-queries' is deprecated and will be removed in a future release. Please use '--slow-query-log'/'--slow-query-log-file' instead. 120618 20:57:32 [Note] Plugin 'FEDERATED' is disabled. 120618 20:57:32 InnoDB: The InnoDB memory heap is disabled 120618 20:57:32 InnoDB: Mutexes and rw_locks use GCC atomic builtins 120618 20:57:32 InnoDB: Compressed tables use zlib 1.2.3.4 120618 20:57:32 InnoDB: Unrecognized value fdatasync for innodb_flush_method 120618 20:57:32 [ERROR] Plugin 'InnoDB' init function returned error. 120618 20:57:32 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed. 120618 20:57:32 [ERROR] Unknown/unsupported storage engine: InnoDB 120618 20:57:32 [ERROR] Aborting I can start the server with the "--skip-innodb --default-storage-engine=myisam" flags, but would like to use innodb. Does anyone know what the issue here is?

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• DVC101 Video Capture Device on USB hub - Ubuntu Server 12.04

  - by John

  I have a Dell Inspiron 8600 laptop I use as a media server/video capture system. It only has 2 USB ports and I have a total of 3 devices I need to connect. The DVC101 works perfectly while plugged directly into the USB port in back of the laptop. Unfortunately it does not get recognized when plugged into a passive or powered USB hub. Questions: Is there something I am missing on the Ubuntu side? Something I need to do that will allow the device to be recognized through the hub? If not, will the extra USB ports on a dell laptop dock (port replicator) act the same as the aftermarket hubs? I know this one is off topic of Ubuntu but any input appreciated.

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• What is the best way to work with large databases in Java depending on context?

  - by user19000

  We are trying to figure out the best practice for working with very large DBs in Java. What we do is a kind of BI (business Intelligence), i.e analyzing very large DBs, and using them to create intermediate DBs that represent intelligent knowledge of the DBs. We are currently using JDBC, and just preforming queries using a ResultSet. As more and more data is being created, we are wondering whether more appropriate ways exist for parsing and manipulating these large DBs: We need to support 'chunk' manipulation and not an entire DB at once(e.g. limit in JDBC, very poor performance) We do not need to be constantly connected since we are just pulling results and creating new tables of our own. We want to understand JDBC alternatives, with respect to advantages and disadvantages. Whether you think JDBC is the way to go or not, what are the best practices to go by depending on context (e.g. for large DBs queried in chunks)?

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• Acer Extensa 5620 - Graphic unknown!

  - by Nycxzon

  I install Ubuntu 12.04 Beta 2, I found out the my graphic driver is "Unknown" and experience is "Standard". Please help me know how to install my graphic driver. as per my laptop specs: Mobile Intel GM965 Express Chipset with integrated 3D graphics, featuring Intel Graphics Media Accelerator (GMA) X3100 with up to 358/3845 MB of Intel Dynamic Video Memory Technology 4.0 (8 MB of dedicated system memory, up to 350/3765 MB of shared system memory), supporting Microsoft DirectX 9. Hope you can help me! Thanks in advance! Noob @ Ubuntu :) Updates! ______________ I found a solution! I found a site where I ask how to check the graphic of my system. by using terminal command "glxinfo" command ask me to install mesa-utils! and update. After that, My graphic driver is listed! Thanks for your continues support! :)

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• O'Reilly 50& off offer on CSS3 books to 05:00 PT on Oct/28

  - by TATWORTH

  Originally posted on: http://geekswithblogs.net/TATWORTH/archive/2013/10/21/oreilly-50-off-offer-on-css3-books-to-0500-pt.aspxAt  http://shop.oreilly.com/category/deals/css3.do?code=WKCSS&imm_mid=0b155e&cmp=em-prog-books-videos-lp-owo_css3_direct_wkcss, O'Reilly are offering 50% off a number of e-books on mastering CSS3 to 05:00 PT on Oct 28 "CSS3—the technology behind most of the eye-catching visuals on the Web today—is loaded with capabilities that once would have required JavaScript or third-party plugins, such as animation, pseudo-classes, and media queries. Use CSS3 to transform markup into stunning, richly detailed web pages that look great in any browser. For one week only, SAVE 50% on CSS3 ebooks from shop.oreilly.com and take your sites from ordinary to incredible."

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• How could I manage Google Adsense to approve my Web App? It keeps denying it

  - by Javierfdr

  Google adsense keeps denying my app from having ads, because of an "insufficient content" issue. I manage a Web Application that allows the users to set Youtube Videos as Alarm Clocks. It includes an in-site Youtube search to retrieve videos from user queries and lists the users alarms. The site has a good traffic (500 users per day), is currently promoted by Google in Google Chrome Webstore, and the ajax requests are crawlable, following Google's guidelines (https://developers.google.com/webmasters/ajax-crawling/). Although I understand there is not much content, beyond the user-generated, I really don't what else should I include in the site. Perhaps adding contact and about pages, and maybe another section would increase the navigation. Google argues I need a "fully launched and functioning site, allowing users to navigate throughout your site with a menu, sitemap, or appropiate links". They also ask for "full sentences or paragraphs" Isn't a Google Adsense solutions for Web Applications? Would all the web-apps have to include useless navigable subpages?

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• Running projects from NTFS partition on Ubuntu

  - by the_hamster

  I'm dual booting Windows 7/Ubuntu 12.04. I want to run C++/Java projects from a NTFS partition, where I keep generally all my files and projects. I fiddled with the fstab. One time I removed 'noexec', the other I changed it to 'exec'. After that,each time, I remounted the partition and it still didn't work. I tried using sudo mount -o remount,exec /media/mypartition It didn't work either. There was a somewhat similar question already, but it didn't have the proper answer for me or I didn't know how to make it work(note: I am a total newbie with Ubuntu and Linux in general).

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• FFmpeg multi pass encoding

  - by Levan

  Sorry, I am really new to this, and have problems doing some tasks without help. So I have a terminal command: ffmpeg \ -y \ -i '/media/levan/BEEA60D8EA608E89/Downloads/Videos/Tony Braxton - Un-Break My Heart.VOB' \ -s 1920x1080 \ -aspect 16:9 \ -r 25 \ -b 15550k \ -bt 19792k \ -vcodec libtheora \ -acodec libvorbis \ -ac 2 \ -ar 48000 \ -ab 320k \ ddd.ogg and I want to have 3 pass video in output video, but how do I accomplish this? I found that I must write -pass n command some where, but where to write it I do not know. I tested this and wrote -pass 3 at the end but then the terminal just showed a > symbol.

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• Point me to info about constructing filters (of lists)

  - by jah

  I would like some pointers to information which would help me understand how to go about providing the ability to filter a list of entities by their attributes as well as by attributes of related entities. As an example, imagine a web app which provides order management of some kind. Orders and related entities are stored in a relational database. And imagine that the app has an interface which lists the orders. The problem is: how does one allow the list to be filtered by, for example:- order number (an attribute) line item name (an attribute of a n-n related entity) some text in an administrative note related to the order (text found in an attribute of a 1-1 related entity) I'm trying to discover whether there is something like a standard, efficient way to construct the queries and the filtering form; or some possible strategies; or any theory on the topic; or some example code. My google foo fails me.

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• How to avoid being an API programmer only?

  - by anything

  I have almost six years of experience in java. I have developed many projects which used frameworks like Struts, Spring, Hibernate, JQuery , DWR, Ajax etc. I have used these technologies in almost all the projects I have worked on. Projects were very simple mostly with crud based apps. My everyday tasks involves creating few screens, writing queries, testing etc. After all these years I feel like I have turned into an API programmer who just uses these above mentioned frameworks which is not giving me any satisfaction of being a programmer. Is this normal or is it just me who is feeling like this?

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