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• IPC linux huge transaction

  - by poly

  I'm building and application that requires huge transactions/sec of data and I need to use IPC to for the mutithreaded mutliprocceses communication, I know that there are a lot of methods to be used but not sure which one to choose for this application. This is what the application is gonna have, 4 processes, each process has 4 threads, the data chunk that needs to be transferred between two or more threads is around 400KB. I found that fifo is good choice except that it's 64K which is not that big so i'll need to modify and recompile the kernel but not sure if this is the right thing to do? Anyway, I'm open to any suggestions and I'd like to squeeze your experience in this :) and I appreciate it in advance.

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• Why is the superblock last mount time in the future?

  - by user69541

  Future time: Since installing Ubuntu 12.04, I regularly have to fun fsck and reset my clock because it shows a 'future time' : Err.Msg. "superblock last mount time is in the future by less than a day, probably due to hardware clock being incorrectly set." FIXED. According to what I have read, it looks like I'm in the right place to get an answer. Following are my feeble attempts to rectify this annoyance: mjh@mjh-desktop:~$ sudo service ntp start [sudo] password for mjh: ntp: unrecognized service mjh@mjh-desktop:~$ mjh@mjh-desktop:~$ sudo apt-get install update Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package update mjh@mjh-desktop:~$ sudo service ntp start ntp: unrecognized service mjh@mjh-desktop:~$ Suggestions? Matthew

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• Search engine bots accessing strange URLs

  - by casasoft

  We have ELMAH enabled on our site and get errors whenever a Page Not Found error is triggered on the website. We have recently redesigned a new website and so we understand that search engine robots might have previously indexed pages which they try to access and result in a Page Not Found errors. For this reason, we have set up permanent redirects for such previously indexed pages to the respective new pages. The website in mention is www.chambercollege.com and for example, a previously indexed URL was www.chambercollege.com/special-offers.aspx. This page is no longer accessible so we have created the necessary permanent redirect to redirect to the respective page on www.chambercollege.com/en/content/special-offers-161/. Now we are starting to receive Page Not Found errors of search engine bots (e.g. MSN bot) trying to access the URL www.chambercollege.com/special-offers.aspx/images/shadow_right.jpg/. Any idea how could a search engine make up that strange URL and whether you have any suggestions of what to do best?

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• How to enable hibernate on Ubuntu 13.10?

  - by mjwittering

  Something I usually do after installing Ubuntu is reactivate the hibernation function. I find it quite useful to function for the more energy concious. Typically, I'd complete the instructions in this tutorial for Ubuntu 12.04 and I'd be back in business. However, it does seem to work any more. Any suggestions? http://www.howtogeek.com/113923/how-to-re-enable-hibernate-in-ubuntu-12.04/ sudo gedit /etc/polkit-1/localauthority/50-local.d/com.ubuntu.enable-hibernate.pkla [Enable Hibernate] Identity=unix-user:* Action=org.freedesktop.upower.hibernate ResultActive=yes

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• Working with Primary Keys and Generators - Quickstart with NHibernate (Part 4)

  - by BobPalmer

  In this NHibernate tutorial, I'll be digging into the ID tag and Generator classes.  I had originally planned on finishing up a series on relationships (parent/child, etc.) but felt this would be an interesting topic for folks, and I also wanted to start integrating some of the current NHibernate reference. Since this article also includes some reference sections (and since I have not had a chance to check for every possible parameter value), I used the current reference as a baseline, and would welcome any feedback or technical updates that I can incorporate. You can find the entire article up on Google Docs at this link: http://docs.google.com/Doc?id=dg3z7qxv_24f3ch2rf7 As always, feedback, suggestions, and technical corrections are greatly appreciated! Enjoy! - Bob

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• Apple pushnotification [closed]

  - by VIVEK

  I have a PHP script located in path like /var/www/vhosts/hostname/httpdocs/webservices, I have both PHP script and .pem files there, and I have called the .pem file in the script properly, but still when I run the script , I don't get push notification , instead i get warnings such as: Warning: stream_socket_client() [function.stream-socket-client]: Unable to set local cert chain file `ck_push_test.pem'; Check that your cafile/capath settings include details of your certificate and its issuer in /var/www/vhosts/ipartyapps.com/httpdocs/webservices/testPush.php on line 12 Warning: stream_socket_client() [function.stream-socket-client]: failed to create an SSL handle in /var/www/vhosts/ipartyapps.com/httpdocs/webservices/testPush.php on line 12 Warning: stream_socket_client() [function.stream-socket-client]: Failed to enable crypto in /var/www/vhosts/ipartyapps.com/httpdocs/webservices/testPush.php on line 12 Warning: stream_socket_client() [function.stream-socket-client]: unable to connect to ssl://gateway.push.apple.com:2195 (Unknown error) in /var/www/vhosts/ipartyapps.com/httpdocs/webservices/testPush.php on line 12 Failed to connect 0 I double checked everything path, permissions and owner/group of both script and .pem files, still not getting push notification. Any suggestions please, as it's urgent.

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• What Are Some Tips For Writing A Large Number of Unit Tests?

  - by joshin4colours

  I've recently been tasked with testing some COM objects of the desktop app I work on. What this means in practice is writing a large number (100) unit tests to test different but related methods and objects. While the unit tests themselves are fairly straight forward (usually one or two Assert()-type checks per test), I'm struggling to figure out the best way to write these tests in a coherent, organized manner. What I have found is that copy and Paste coding should be avoided. It creates more problems than it's worth, and it's even worse than copy-and-paste code in production code because test code has to be more frequently updated and modified. I'm leaning toward trying an OO-approach using but again, the sheer number makes even this approach daunting from an organizational standpoint due to concern with maintenance. It also doesn't help that the tests are currently written in C++, which adds some complexity with memory management issues. Any thoughts or suggestions?

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• how do i stop root from running a program

  - by joe Lovick

  I would like to prevent my root user from running certain applications that can change the permissions of files which in turn prevents normal users from running those applications again. for example, if i sudo to root, and then run thunderbird from the command prompt, it changes the permissions of files within my home dir / profile so i can no longer run it as a normal user; what i would like to do is prevent root from running thunderbird and hence stop this user error from repeating itself. any suggestions? to clarify, if i have a lot of administration to do i use "sudo -s" which gives me a root shell, its just once a year or so, i shoot myself in the foot.

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• What are the best patterns/designs for stateful API development?

  - by Svante

  I am about to implement a API for my TCP/IP server written in Java. Right now I have a temporary method that takes a String, executes a command based on the String and returns a String basically like the following. public void communicate(BufferedReader in, PrintWriter out) { while(true) { out.println(handleCommand(in.readLine())); } } private String handleCommand(String command) { if (command.equals("command1") { // do stuff return "Command 1 executed"; } else if (command.equals("command2") { // do some other stuff return "Command 2 executed"; } } I really want to do something more extensible, smarter and stateful, so I could handle more complex and stateful commands and without the method/class getting bloated. How would you start? Suggestions, ideas, or links for further reading are very welcome.

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• 12.04 Server- No Such Partition After Adding HDD

  - by Mark

  12.04 server installed. Physically added a 1TB drive to system and I'm now getting: GRUB loading. error: no such partition. grub rescue> Any thoughts/suggestions? Mark EDIT: Once I create a partition on the new drive (with GParted from LiveCD), I get a blinking cursor at boot and nothing else. EDIT: Unplugged first drive and tried to install on 2nd (1TB v. 120GB). When creating partition I get Incorrect metadata area header checksum in virtual console(f4)

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• Geolocation Blocking and SEO

  - by Mahesh

  I'm in process to block a particular geolocation from accessing my site. But i am not sure if this is going to raise any flags on my website. Basically i'm getting lots of spam from particular state and there are some webmaster copying my content without any attribution or backlink. I feel that is enough and i wish to save my bandwidth on that state or geolocation. So my question is how to block particular geolocation ? Do you have any suggestions for php scripts that help block particular geolocation ? and another question: if there are any SEO disadvantages ?

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• Vanilla forum personal journal tool

  - by user16648

  I am developing a forum for a research project, i am using Vanilla forum (though i am not tied to this yet). Another feature of this site will be a personal journal/diary/blog. Only the user and administrators will have access to the journal. The journal does not need any advanced features. Does anybody have any suggestions on software/script that could easily be integrated with Vanilla forum for this purpose? My first thought was using Wordpress but it is a bit to complex to adminstrate as the site is meant to be simple. And i dont really see how it can be intregrated easily the way i want it.

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• Is someone aware of any multi threaded unrar program?

  - by rsz

  I was searching in the past (past few weeks) for a program/software which is multithreaded and it is able to extract rarparts using multi threading. What software's i've already tried? unrar, unrar-nonfree, rar, 7zip It seemed to me that none of them is multi threaded and therefore they are all slow. The solution would be needed in cli format so if not necessary the no gui. Is someone aware of something like this? I asked on other irc's for suggestions and they told me, that the best is to write one myself. I may be agree with them, but i don't have these type of knowledge to achieve this task.

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• Subscribe/Publish Model in Web-based Application (c#) - Best Practices for Event Handlers

  - by KingOfHypocrites

  I was recently exposed to a desktop application that uses an publish/subscribe model to handle commands, events, etc. I can't seem to find any good examples of using this in a web application, so I wonder if I am off base in trying to use this for web based development (on the server side)? I'm using asp.net c#. My main question in regards to the design is: When using a publish/subscribe model, is it better to have generic commands/events that pass no parameters and then have the subscribers look at static context objects that contain the data relevant to the event? Or is it better to create custom arguments for every event that contain data related to the event? The whole concept of a global container seems so convenient but at the same time seems to break encapsulation. Any thoughts or best practices from anyone who has implemented this type of model in a web based application? Even suggestions on this model out of the scope of my question are appreciated.

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• How to remove session entries from LightDM?

  - by Lexalt

  I recently added Cairo Dock to my GNOME Shell in 11.10. Cairo Dock is GREAT, but I'm left with one little problem that I'd like to fix: after installing Cairo Dock, LightDM includes two extraneous entries to non-working desktops. (The entries to working desktops remain unaffected, so I guess I could just ignore the extraneous entries, but...) So I'd like to remove/edit the extraneous entries in LightDM. I've looked and looked for discussions on how to do so, but haven't had much luck. Any suggestions on how to go about editing the login menu in 11.10?

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• Booting Ubuntu shows only cursor, no desktop features

  - by jlkkljh

  I'm trying to install Ubuntu and have been trying since 2010 on my Win XP (2006-2008 I don't know which year's version exactly). I'm trying to get rid of XP and every time I install Ubuntu it doesn't work. I've tried all the options on the install list from Wubi and from inside the installer. I've tried a lot of different stuff and all it will load is a mouse cursor and a black screen. Please do help out with suggestions/advice. Thanks in advance.

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• Triple Boot Question

  - by Rick

  I have successfully set up a a win7,win8 and Ubuntu 12.10 system. Windows 8 and Ubuntu are located on the same SSD, while windows 7 is located on another SSD. All went great and I can continue playing around with all 3 OS's. My only annoyance is, while restarting, windows 7 boot loader runs first. If I select ubuntu in the win7 manager it then runs grub2 and asks me to select an os. I used easy bcd to add entries into win8's boot manager and was hoping to just use that one. I installed ubuntu's loader on to its own partition. Any suggestions to just use Win8 loader and still be able to choose between all 3?

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• Ideal laptop specs for a Computer Science Masters student? [closed]

  - by Ayush

  I have a HP pavillion core 2 duo 2 GHz and 4 GB RAM, and it is painful to use this machine for any kind of coding. Eclipse (especially Juno) literally takes 5 minutes to load. And even after that, everything is lagy. Apart from school stuff, I also use my computer as a television. I watch Hulu, Netflix, YouTube etc in 720p, and this laptop gets hot as hell and the fans are loud enough to wake somebody up from deep sleep. I DON'T use my laptop for Gaming or Video/Photo Editing. I'm looking to buy a new laptop (in which most widely used IDEs would work smoothly and playing hi-def videos wouldn't be too much for the machine to handle) any suggestions (on hardware specs) would be greatly appreciated. Thanks

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• Clone Unity Dock for All Users?

  - by jduc

  I've spent 3 days trying to figure out how to clone the Unity dock from my firstuser profile in Ubuntu 12.04 to all of the other profiles I'm hoping to create. I've read where the /etc/skel folder contents get populated to all new profiles but this doesn't seem to include the dock or the desktop folders and icons. I've also copied the entire contents of my /home/firstuser folder to my /home/seconduser folder (including .* files) but the dock is still showing the stock icons and not the icons I've designated in my firstuser profile dock. Does anyone have any suggestions?

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• Aide On a Low Memory System

  - by Jason Mock

  I have a Linux server running on a Linode.com VPS, where I'm trying to utilize aide to detect any issues. However, the nightly aide run uses up all of my available memory and swap (512MB RAM / 384MB SWAP). I've tried adding a script to /etc/cron.daily that would stop/start services using a lot of memory (apache2, mysql) during the aide run. Unfortunately, it seems like aide continued to use every available byte (including the space freed up from apache2 and mysql). Here's a graph from munin showing what happens when aide runs: Note the spike of memory usage, well into swap, when aide runs Any suggestions on tuning aide to not use so much memory, or is there an alternative to aide that doesn't behave this way?

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• Passing variable from SharePoint to external website

  - by TechDaddyK

  My company has a SharePoint site that is administered by the IT department (versus the Web Developer... go figure!). We have partnered with a vendor that has built a site for our staff to order customized stationery, etc. I need to create a link on the SharePoint site that will take the user to the external site but identify them individually. The vendor is suggesting this format: https://www.VENDORSITE.com/UI/Profile.hcf?id=a02b8106-4115-47cd-bca7-ce4dd447ef89&username=<user name>&password=<password>&name1=<first name>&name2=<last name>&email=<email> Here's the problem: I don't know how to pass that info, or even a single variable, from the SharePoint site to the external site. I would appreciate ANY suggestions.

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• Ubuntu 12.04 Syntek in-built webcam not detected

  - by Farotz

  I have installed Ubuntu 12.04 and my inbuilt camera is not detected. I have tried with Cheese and GUVCView, but neither detects the webcam. I have also tried the solution proposed above using the Terminal, with no results. This is my lsusb output: farotz@farotz-EasyNote-BU45:~$ lsusb Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 003: ID 174f:a821 Syntek Web Cam - Packard Bell BU45, PB Easynote MX66-208W Bus 002 Device 002: ID 1d57:0008 Bus 003 Device 002: ID 08ff:1600 AuthenTec, Inc. AES1600 Bus 001 Device 007: ID 12d1:142d Huawei Technologies Co., Ltd. farotz@farotz-EasyNote-BU45:~$ Any suggestions? Thank you.

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• How to get the Dash and HUD to appear. (and stop Unity spewing error messages.)

  - by Ubuntiac

  I just installed Ubuntu 12.04 on my wifes Dell Inspiron 1501, which uses an R300 ATI graphics chip. Neither the Dash or HUD appear when pushing the appropriate key. When I try unity --reset & in the terminal, I see that over and over it's spitting out: r300: CS space validation failed. (not enough memory?) Skipping rendering. This is just after starting Ubuntu with no apps open, so I find it hard to believe that just rendering the Dash / HUD is completely blowing out the VRAM. Any suggestions on getting this working? /usr/lib/nux/unity_support_test -p shows OpenGL vendor string: X.Org R300 Project OpenGL renderer string: Gallium 0.4 on ATI RS480 OpenGL version string: 2.1 Mesa 8.0.2 Not software rendered: yes Not blacklisted: yes GLX fbconfig: yes GLX texture from pixmap: yes GL npot or rect textures: yes GL vertex program: yes GL fragment program: yes GL vertex buffer object: yes GL framebuffer object: yes GL version is 1.4+: yes Unity 3D supported: yes All sections say "YES"

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• Help! GUI design tool for web & windows applications (2 replies)

  Hi All, We are currently looking to buy a Windows &amp; Web GUI design tool. Our company is doing softwares for Windows &amp; Web application with Visual Studio 2008. Our clients will be using this tool to build screenshots. Projects delivery should be faster with this tool. Do you have any suggestions ? Of course, a Microsoft Parter product is better... Thanks for your help! Simon Levesque Sonim6 Inc.

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• How do you change your screen's color temperature in Ubuntu?

  - by RPG Master

  I edit my photos on my laptop (yes, I know they have crap displays) and I recently had to replace the screen because the old one just randomly died. The old one had decent color reproduction by default, but this new one is VERY blue. After playing with the Gamma I've gotten it to be a bit better, but it's still pretty blue. So, my question is, how do I go about changing my laptop's display's color temperature? And I don't mean through something like the Red, Green, Blue sliders in the NVIDIA config menu. I'm talking about like adjusting in degrees, like editing a photo's white balance. EDIT: So now I've found Redshift and it's doing me pretty good. I thought it might be helpful if I out here the command I'm using. redshift -t 5000:5000 -g .5 By adding this to my start up commands I should be good. I'm still open to other suggestions, because I'd like something that actually edited my xorg.conf or something like that.

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