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  • ubuntu 12.10/linux mint 14 ssh-copy-id doesn't work and returns Ambiguous output redirect

    - by Marc
    I recently got a new computer and I'm trying to use ssh-copy-id to put my keys on another server so I can login without password. but when I try ssh-copy-id -i ~/.ssh/id_rsa.pub user@server and after inputting the correct password it returns Ambiguous output redirect. There are no other messages after that. I thought it was maybe just Ubuntu 12.10 so I installed Linux Mint 14 and sure enough exact same thing happens. I've tried removing authorized_keys from the remote server but that didn't change anything.

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  • Procurement: Troubleshooting Approval Hierarchy Issues

    - by Annemarie Provisero
    ADVISOR WEBCAST: Procurement: Troubleshooting Approval Hierarchy Issues PRODUCT FAMILY: EBS - Procurement November 29, 2011 at 7 am MST, 9 am EST, 2 pm London, 4 pm Cairo This one-hour session is recommended for technical and functional users who would like to know how Purchasing builds the approval list for a document. It also includes a troubleshooting section for cases where the list does not include the correct approvers or when workflow fails to build the approval list (no approver found). TOPICS WILL INCLUDE: Overview of Oracle Purchasing Approval Hierarchy, The Approval Methods. The Approval List. How to Troubleshoot and Diagnose Related Issues Demonstration A short, live demonstration (only if applicable) and question and answer period will be included. Oracle Advisor Webcasts are dedicated to building your awareness around our products and services. This session does not replace offerings from Oracle Global Support Services. Click here to register for this session ------------------------------------------------------------------------------------------------------------- The above webcast is a service of the E-Business Suite Communities in My Oracle Support. For more information on other webcasts, please reference the Oracle Advisor Webcast Schedule.Click here to visit the E-Business Communities in My Oracle Support Note that all links require access to My Oracle Support.

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  • Analyzing Memory Usage: Java vs C++ Negligible?

    - by Anthony
    How does the memory usage of an integer object written in Java compare\contrast with the memory usage of a integer object written in C++? Is the difference negligible? No difference? A big difference? I'm guessing it's the same because an int is an int regardless of the language (?) The reason why I asked this is because I was reading about the importance of knowing when a program's memory requirements will prevent the programmer from solving a given problem. What fascinated me is the amount of memory required for creating a single Java object. Take for example, an integer object. Correct me if I'm wrong but a Java integer object requires 24 bytes of memory: 4 bytes for its int instance variable 16 bytes of overhead (reference to the object's class, garbage collection info & synchronization info) 4 bytes of padding As another example, a Java array (which is implemented as an object) requires 48+bytes: 24 bytes of header info 16 bytes of object overhead 4 bytes for length 4 bytes for padding plus the memory needed to store the values How do these memory usages compare with the same code written in C++? I used to be oblivious about the memory usage of the C++ and Java programs I wrote, but now that I'm beginning to learn about algorithms, I'm having a greater appreciation for the computer's resources.

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  • Sudden drop in Total Indexed pages and increase in 'Not Selected' number.

    - by Pravin
    My blog is around 1 year old and have PR2. The average daily pageviews upto last 1 week were 1800. The total number of posts are 180. Though I have only 180 total posts, the total number of Indexed URL was increasing and it was as high as 510. But in the month of Sept2012, the total number of Indexed pages dropped from 510 to 214. The drop was sudden and it is now increasing very slowly. Also, the other main concern is huge increase in 'Not Selected' number. It is currently 814. I have never posted any post again and never copied any idea from any other blog. But I do use internal linking to some older post those are related to the new posts. The questions are:; Why there is sudden drop in the 'Total Indexed' pages. Why there was increase in total indexed pages to 500 even though the total posts were only 180. As the drop in 'Total Indexed' was in the month of sept2012, I was getting same organic traffic and it was steadily increasing till last week and then there was a 50 drop in the total pageviews. Why. Now, again the traffic is becoming to normal but still there is a problem. Is increase in the 'Not selected' number is a cause of drop in 'Total Indexed'? How to prevent or reduce the number of 'Not Selected' even though I do not have any duplicate post withing blog. Is the 'internal linking' to older post creating 'Not selected' problem? Should I edit my 'Robot.txt' to avoid crawling of labes that may be creating duplicate posts or something like that, if so, what is correct robot.txt. I have uploaded the screenshot of the graph of Webmaster Tools. Please take a look and give suggestions. Please help. Thank you in advance.

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  • Can Clojure's thread-based agents handle c10k performance?

    - by elliot42
    I'm writing a c10k-style service and am trying to evaluate Clojure's performance. Can Clojure agents handle this scale of concurrency with its thread-based agents? Other high performance systems seem to be moving towards async-IO/events/greenlets, albeit at a seemingly higher complexity cost. Suppose there are 10,000 clients connected, sending messages that should be appended to 1,000 local files--the Clojure service is trying to write to as many files in parallel as it can, while not letting any two separate requests mangle the same single file by writing at the same time. Clojure agents are extremely elegant conceptually--they would allow separate files to be written independently and asynchronously, while serializing (in the database sense) multiple requests to write to the same file. My understanding is that agents work by starting a thread for each operation (assume we are IO-bound and using send-off)--so in this case is it correct that it would start 1,000+ threads? Can current-day systems handle this number of threads efficiently? Most of them should be IO-bound and sleeping most of the time, but I presume there would still be a context-switching penalty that is theoretically higher than async-IO/event-based systems (e.g. Erlang, Go, node.js). If the Clojure solution can handle the performance, it seems like the most elegant thing to code. However if it can't handle the performance then something like Erlang or Go's lightweight processes might be preferable, since they are designed to have tens of thousands of them spawned at once, and are only moderately more complex to implement. Has anyone approached this problem in Clojure or compared to these other platforms? (Thanks for your thoughts!)

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  • File permissions issue with an NFSv4 share, uploaded from a Mac Lion

    - by POP.sicle
    I have an NFSv4 share that was working fine, with Macs using Snow Leopard, to share files across the network. The NFS share has one cloned user/group that all clients autoconnect as. However, when I use a Lion Mac to copy a file from their user directory to the NFS, no other computer (mac SL/mac Lion/Win7) can edit/delete/write to the file that was uploaded - despite having the correct read/write/ex permissions visible on the NFS and through terminal. Attempting to edit the file permissions through Finder completely locks the file. I suspect this has something to do with Lion's ACLs (or maybe its version control) conflicting with NFSv4. Is there a way to disable or ignore extended ACLs or extended file permissions on the NFSv4 side, that would allow users to not run into this conflict? The work around currently is to use NFS Manager and set automounts to ignore ownership but installing NFS manager and configuring automounts for all of the computers seems more troubling than attempting to reconfigure the NFS settings. Advice?

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  • Using Virtual Domains with WordPress and Cherokee Web Server

    - by ikevinjp
    I'm trying to configure WordPress to work with Cherokee Web Server. The multi-site set up in WordPress is yyy.com and uses 'sub-domains'. Thus, I have sites like aaa.yyy.com, bbb.yyy.com - they all work fine so far. However, I have another completely different domain: abcde.com. Within WordPress, the sub-domain set up is abcde.yyy.com. When a public user accesses abcde.com, it cannot properly be redirected to the WordPress sub-domain abcde.yyy.com. How do I set up Cherokee to properly redirect virtual domains to WordPress? That means, the domain facing public would be abcde.com but WordPress would want to see abcde.yyy.com to properly return the correct content for the specific site. (I tried and it always get redirected to something like this: "http://yyy.com/wp-signup.php?new=abcde.com")

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  • Apache2 enable .ini mod in /etc/php5/mods-available

    - by GuiTeK
    One can use the a2enmod [module] command to enable mods located in /etc/apache2/mods-available. But what about mods in /etc/php5/mods-available? When I try to enable a mod in this directory (eg. xdebug), I get the following error: ERROR: Module xdebug does not exist! Yet, /etc/php5/mods-available/xdebug.ini exists. I understand a2enmod may work only with *.load files (it makes sense since *.ini files are just configuration files) but then what's the correct way of enabling modules located in /etc/php5/mods-available?

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  • OpenGL profiling with AMD PerfStudio 2

    - by Aurus
    I'm rendering just a really small amount of polygons for my UI but however I still tried to increase the FPS. In the end I removed redundant calls which increased the FPS. I really don't want to lose FPS for nothing so I keep looking for more improvements. The first thing I noticed is the "huge" time where no calls are made before SwapBuffer (the black one). Well I know that OpenGL works asynchronous so SwapBuffer has to wait until everything is done. But shouldn't PerfStudio mark this time also as black ? Correct me If I am wrong. The second thing I noticed is that some glUniform2f calls just take longer (the brown ones). I mean they should all upload 2floats to the GPU how can the time be so different from call to call. The program isn't even changed or something like that. I also tried to look at other programs like gDebugger or CodeXL but they often crashed and they show less statistics (only # of calls or redundant calls etc.) EDIT: I also realized that the draw calls also have different durations, which was obvious for me but sometimes drawing more vertices is faster than drawing less vertices.

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  • SQL SERVER – Caption the Cartoon Contest – Last 2 Days

    - by pinaldave
    Developer’s life is very interesting, we often want to start my day early at a job so we can go home early. However, the day never comes as the life of the developer is always about working late hours. If the developer goes to the office early – there are good chances that his co-workers will come late. Additionally, I am confident that there will be always something urgent for developers or DBA to solve right at the time they are ready to go home. This is the life of the developers!  Here is the interesting story of a DBA who was about to go to the home. He had to take his girlfriend to a movie and dinner in 30 minutes. However, his manager asks him to fix the performance related issues with their production server. In normal case, he had only two choices a) Job or b) Girlfriend. Well, our super hero DBA decided to use efficient tools and improve the performance of the production server in merely 30 minutes. When he was done, his manager was absolutely surprised by his efficiency and accuracy of the work. He asked him following question - Here is the contest – you need to guess what was the answer of our Super Hero DBA. If you guess the answer correct you may win Star Wars R2-D2 Inflatable Remote Controlled device. Additionally, if you Download DB Optimizer before Dec 8, 2012 – you will be eligible for USD 25 Amazon Gift Card (there are total 10 such awards). Please do not leave comments in this thread – to participate in the contest – please leave a comment here in the original contest page. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Puzzle, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology

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  • Microsoft Basic Office 2007 Activation Keys won't work after re-installing on my Laptop

    - by Rolnik
    So, I've upgraded my hard-drive on my laptop, and proceeded to grab my trusty copper-faced Official MS Office disk to do an install. I have three licenses with the fancy green-blue paper that identifies the license keys. Problem is, that for each of these license keys, when the Office 2007 software asks that I enter the "Product Key" it states: The key is incorrect. Verify that you have the correct key, and then retype it Why would Microsoft want to inhibit/prohibit re-installs on the same machine that the software was initially installed to? Incidentally, the same goofy error happens with each of the three valid product key (activation keys) that I enter.

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  • Automatically updating routing table on server

    - by bramp
    I have a LAN with three routers on it, one connected to the Internet, one VPN router connected to a few remote sites, and a final route connected to a private network (using BGP to get prefix advertisements). On the same LAN I have multiple Linux servers which needs access to the networks behind each router. I have achieved this by configuring static routes on the server, pointing the different network prefixes to the correct router. This has worked well, but every time we connect to a new remote VPN, we have to change all the servers to be aware that the network is now accessible via the VPN, and not via the default Internet route. What I want is a way to automatically update the routes on all of the servers, when the route is added to a routers. Now, I could install Quagga or something similar on all the servers to receive router advertisements, but that seems like overkill. So my question is what is the easiest/simpliest way to update the routing tables on the server automatically, and what protocol is best suited for this purpose. thanks

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  • how to install curl 13.04 with depency error

    - by whale_steward
    how to install curl in ubuntu 13.04? it always throw this error : Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: curl : Depends: libcurl3 (= 7.29.0-1ubuntu3) but 7.29.0-1ubuntu3.2 is to be installed E: Unable to correct problems, you have held broken packages. when using sudo apt-get update, it shows: 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. here are the steps i had done : using sudo apt-get install curl removing google-chrome-stable and chromium browser then sudo apt-get install curl use sudo apt-get autoremove && sudo apt-get autoclean && sudo apt-get clean then run the 1st step again. also i have tried : How do I resolve unmet dependencies? and still throw the same error. at this point i dont know what i did wrong, is curl impossible to install in ubuntu ?

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  • Easiest, most fun way to program 2D games? Flash? XNA? Some other engine?

    - by Maxi
    Hi, this is a post detailing my search for the most enjoyable way for a hobbyist game programmer to sweeten his free time with making a game. My requirements: I looked at Flash first, I made a couple of small games but I'm doubtful of the performance. I would like to make a fairly large strategy game, with several hundred units fighting simultaneously, explosions and animations included. Also zoomable maps. I saw that Adobe has a new 3D API for Flash, but I don't know if that improves 2D performance aswell, I couldn't find anything related to that question on their MAX10 sessions. Would you say that Flash is a good technology for making large 2D games easily? I really like Actionscript, and I love how easy everything is in Flash. There are several engines available which make it even easier. I just do this for fun, and it would be even better if there were proper animation/particle editors available and if the engine I were to use, would be available for multiple platforms. (so more people can play my game once finished). I'd like to have it available on many mobile platforms aswell. (because I love touch input for some reason) I do know the XNA framework pretty well, but there are no good engines available for it, and it will only run on Windows, which is a huge turn off. Even bigger is, that you need to install the XNA redistributable each time you want to give the game to someone. If I use XNA, I would have to make all the tools myself, and I'd probably have to make them with WPF. (I'd love to make tools with Adobe AIR, but unfortunately the API's for image manipulation etc. are far worse in Flash, than they are in XNA/WPF.) Now, I'm aware that I could make my own engine that supports each of those platforms, but quite frankly, that would be too much work plowing through APIs. After all, I want to make a game, not an engine. So the question becomes: Is there maybe a cross platform (free or free to develop?) engine available that I could use for 2D development? I prefer: C#, Actionscript. I don't mind using c++ if the toolset is above average, but I highly doubt that there is something out there like that. Please prove me wrong :) So summary: I'd like to use Flash, but I don't know if it scales well enough. I'm not a scripter, I want some real APIs that I can work with inside a proper IDE. Just for information, I looked at several alternatives, I'm actually looking for a long time already. You'd help me a lot to make a decision finally. Feature-wise the Flatredball engine would be ideal. But I tried their tools, and quite frankly, they are horrible. Absolutely unusable, I'd need to make my own for sure. I didn't look at their API, but if their tools are so bad, I'm not inclined to look further. Unity3D. This one is quite nice, but I really don't need 3D, and it is quite ...a lot of work to learn. I also don't like that it is so expensive to use for different platforms and that I can only code for it through scripting. You have to buy each platform separately. The editor usability is average, the product overall is good enough for most purposes, but learning it myself would be overkill. Shiva 3D. It looks good enough, but again: I don't really need 3D. The editor usability is a little worse than Unity3D in my opinion and it wasn't clear to me how to start programming. I think it requires C++ for coding, so that's a negative too. I want to have fun, and c# is fun ;) SDL. Quite frankly, I'd still need to port to all those different SDL implementations. And I don't like OpenGL style programming, it's just plain ugly. And it needs c++, I know that there might be some wrappers available, but I don't like to use wrappers, because... Irrlicht. A lot of features, but support seems to be low and it is aimed at enthusiasts. C# bindings get dropped repeatedly. I'm not an engine enthusiast, I just want to make a game. I don't see this happening with Irrlicht. Ogre3D. Way too much work, it's just a graphics engine. Also no multiple platform support and c++. Torque2D. Costs something to use, and I didn't hear a lot of good things about support and documentation. Also costs extra for each platform.

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  • Visual Studio 2005 SP1 refuses to install in Windows 7

    - by JesperE
    I'm trying to install Visual Studio 2005 in Windows 7. When attempting to start, Windows 7 complains that VS2005 is incompatible with Windows 7 and offers me to search online for a solution. It comes up with a link to VS2005 SP1 for Vista and Windows 7, but when I download it (VS80sp1-KB932232-X86-ENU.exe) and try to run it, it refuses to install saying that The upgrade patch cannot be installed by the Windows Installer service because the program to be upgraded may be missing, or the upgrade patch may update a different version of the program. Verify that the program to be upgraded exists on your computer and that you have the correct upgrade patch.

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  • Microsoft Cluster or Oracle Fail Safe error

    - by osdm
    Trying to get Oracle Database 10g to work on Microsoft cluster (using Oracle Fail Safe, not RAC). Everything installed, but when trying to verify group or add database to group I get following error: FS-10220: Network name MSK00-NST01-1 maps to IP address 10.1.11.74 in the cluster resource but maps to IP address 10.1.1.74 on the system MSK00-NST01-1 is cluster name, 10.1.11.74 is first node IP, 10.1.1.74 is second node IP. Oracle documentation says "The cluster and the system must have the same IP address mapping for a network name. Check that either the network name server or the local host file has the same IP address mapping as the cluster." Where is the error - in Oracle configuration or in cluster configuration? What are possible ways to correct it? Thanks a lot for any ideas.

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  • Openfire on Mac OS X: can't log in after setup

    - by Tom
    Hey all, I'm trying to set up Openfire (http://www.igniterealtime.org/projects/openfire/) on Mac OS X. The install goes well, and I can start the server and enter the admin console via its System Preferences pane. I run the setup, including specifying the password for the admin user. However, when I try to log into the admin console, I get the message "Login failed: make sure your username and password are correct and that you're an admin or moderator." What gives? I've tried to RTFM, but the documentation seems to be really sketchy. Nowhere is the setup process mentioned in the install docs.

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  • Can't get PDO MySQL driver to work on PHP

    - by bart
    Trying to install Vanilla 2 locally using MAMP i got the error: "You must have the MySQL driver for PDO enabled in order for Vanilla to connect to your database". When I check phpinfo() I see: --with-pdo-mysql=shared,/Applications/MAMP/Library --with-pdo-pgsql=shared,/Applications/MAMP/Library/pg When I go and check out those paths I find the files: libpq.5.dylib libpq.dylib libpq.5.2.dylib When I check my php.ini file I see: ; Extensions extension=pdo_mysql.so In php.ini the path to the extension dir is correct (checked it manually): extension_dir = "/Applications/MAMP/bin/php5.3/lib/php/extensions/no-debug-non-zts-20090626/" In this folder I find the file: pdo_mysql.so phpinfo() gives me two sections: PDO PDO drivers: sqlite, sqlite2 and pdo_sqlite SQLite Library: 3.6.22 So everything seems to be fine, but can't get the PDO MySQL driver working :(

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  • How to 301 redirect from old query string urls to CakePHP Canonical urls?

    - by Daniel Bingham
    I currently have a .htaccess file that looks like this: RewriteCond %{QUERY_STRING} ^action=view&item=([0-9]+)$ RewriteRule ^index\.php$ /index.php?url=item/%1 [R=301] RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME} !-f RewriteRule ^(.*)$ index.php?url=$1 [QSA,L] It is meant to 301 redirect my old query string based URLs to new CakePHP urls. This will successfully send users to the correct page. However, Google doesn't seem to like it (see below). I previously tried doing this: RewriteCond %{QUERY_STRING} ^action=view&item=([0-9]+)$ RewriteRule ^index\.php$ /item/%1 [R=301] RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME} !-f RewriteRule ^(.*)$ index.php?url=$1 [QSA,L] But that fails. The second rewrite rule doesn't seem to catch the rewritten URL. It goes straight through. Using the first version wouldn't be a problem, except that I suspect that is what is choking up Google. It hasn't indexed my sitemap full of the new URLs. My old sitemap had been fully indexed and all the URLs are in Google's index. But it isn't following the redirects from the old URLs to the new. I have a 'not followed' error for every one of the query urls that was in my old sitemap. Am I properly using a 301 redirect here? Is it the weird rewrite rule? What can I do to send both Google and users to the proper page and save my page rank?

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  • Effortlessly resize images in Orchard 1.7

    - by Bertrand Le Roy
    I’ve written several times about image resizing in .NET, but never in the context of Orchard. With the imminent release of Orchard 1.7, it’s time to correct this. The new version comes with an extensible media pipeline that enables you to define complex image processing workflows that can automatically resize, change formats or apply watermarks. This is not the subject of this post however. What I want to show here is one of the underlying APIs that enable that feature, and that comes in the form of a new shape. Once you have enabled the media processing feature, a new ResizeMediaUrl shape becomes available from your views. All you have to do is feed it a virtual path and size (and, if you need to override defaults, a few other optional parameters), and it will do all the work for you of creating a unique URL for the resized image, and write that image to disk the first time the shape is rendered: <img src="@Display.ResizeMediaUrl(Path: img, Width: 59)"/> Notice how I only specified a maximum width. The height could of course be specified, but in this case will be automatically determined so that the aspect ratio is preserved. The second time the shape is rendered, the shape will notice that the resized file already exists on disk, and it will serve that directly, so caching is handled automatically and the image can be served almost as fast as the original static one, because it is also a static image. Only the URL generation and checking for the file existence takes time. Here is what the generated thumbnails look like on disk: In the case of those product images, the product page will download 12kB worth of images instead of 1.87MB. The full size images will only be downloaded as needed, if the user clicks on one of the thumbnails to get the full-scale. This is an extremely useful tool to use in your themes to easily render images of the exact right size and thus limit your bandwidth consumption. Mobile users will thank you for that.

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  • Real-time stock market application

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

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  • How do I connect to Ubuntu One after changing the password?

    - by rumtscho
    I changed my password for Ubuntu One using the Web interface, and added a new computer. Since then, the old computer does not synchronize with Ubuntu One. It doesn't show any error messages or such, but files uploaded from the web interface or changed on the newly added computer don't appear/change on the old computer. I guess that it can't connect because it is still using the old password. The problem is that I can't find an interface to change the password the client is using to connect to the service. The "manage account" option opens the Web interface. I looked into the keyring, and found the key for Ubuntu One, but there I only see an encrypted version of the password, so I can't change it there. So what is the correct way to tell my client that my account password has changed? Edit this is what I see when I open Preferences -- Ubuntu One. Is there something wrong with it? It also stubbornly insists that it has successfully synchronized. But the files I have added from other computers are not in my Ubuntu One folder.

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  • Cmd+Less Than (10.8.2) not working after Xcode (4.5.x) installed

    - by Felix Lieb
    I had to reinstall my MBP recently. I stress Cmd+Less Than a lot for switching between Xcode's main window and the Organizer for documentation. The standard OSX-shortcut for doing that is Cmd + Less Than. After installing Xcode it didn't work any longer. I saw, that Xcode uses Cmd+LT for "Edit Schemes", a rarely used option. Even after deleting the shortcut for "Edit Schemes" in Xcode, Cmd+LT didn't work. How can I get Cmd + Less Than to work again? Mac OS X Mount Lion 10.8.2 Xcode 4.5.2 I have less than 10 reputation on superuser (acutally first post here), so I can't post the answer to my question. Would yo be so kind and upvote this question, so I can officially answer the question? The question, as well as the answer is only correct, if you use German keyboard layout.

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  • Implementing the transport layer for a SIP UAC

    - by Jonathan Henson
    I have a somewhat simple, but specific, question about implementing the transport layer for a SIP UAC. Do I expect the response to a request on the same socket that I sent the request on, or do I let the UDP or TCP listener pick up the response and then route it to the correct transaction from there? The RFC does not seem to say anything on the matter. It seems that especially using UDP, which is connection-less, that I should just let the listeners pick up the response, but that seems sort of counter intuitive. Particularly, I have seen plenty of UAC implementations which do not depend on having a Listener in the transport layer. Also, most implementations I have looked at do not have the UAS receiving loop responding on the socket at all. This would tend to indicate that the client should not be expecting a reply on the socket that it sent the request on. For clarification: Suppose my transport layer consists of the following elements: TCPClient (Sends Requests for a UAC via TCP) UDPClient (Sends Requests for a UAC vid UDP) TCPSever (Loop receiving Requests and dispatching to transaction layer via TCP) UDPServer (Loop receiving Requests and dispatching to transaction layer via UDP) Obviously, the *Client sends my Requests. The question is, what receives the Response? The *Client waiting on a recv or recvfrom call on the socket it used to send the request, or the *Server? Conversely, the *Server receives my requests, What sends the Response? The *Client? doesn't this break the roles of each member a bit?

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  • Is an Ethernet point to point connection without a switch real time capable?

    - by funksoulbrother
    In automation and control, it is commonly stated that ethernet can't be used as a bus because it is not real time capable due to packet collisions. If important control packets collide, they often can't keep the hard real time conditions needed for control. But what if I have a single point to point connection with Ethernet, no switch in between? To be more precise, I have an FPGA board with a giga-Ethernet port that is connected directly to my control PC. I think the benefits of giga Ethernet over CAN or USB for a p2p connection are huge, especially for high sampling rates and lots of data generation on the FPGA board. Am I correct that with a point to point connection there can't be any packet collisions and therefore a real time environment is given even with ethernet? Thanks in advance! ~fsb

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