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• Design Pattern Advice for Bluetooth App for Android

  - by Aimee Jones

  I’m looking for some advice on which patterns would apply to some of my work. I’m planning on doing a project as part of my college work and I need a bit of help. My main project is to make a basic Android bluetooth tracking system where the fixed locations of bluetooth dongles are mapped onto a map of a building. So my android app will regularly scan for nearby dongles and triangulate its location based on signal strength. The dongles location would be saved to a database along with their mac addresses to differentiate between them. The android phones location will then be sent to a server. This information will be used to show the phone’s location on a map of the building, or map of a route taken, on a website. My side project is to choose a suitable design pattern that could be implemented in this main project. I’m still a bit new to design patterns and am finding it hard to get my head around ones that may be suitable. I’ve heard maybe some that are aimed at web applications for the server side of things may be appropriate. My research so far is leading me to the following: Navigation Strategy Pattern Observer Pattern Command Pattern News Design Pattern Any advice would be a great help! Thanks

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• Kent .Net/SqlServer User Group – Upcoming events

  - by Dave Ballantyne

  At the Kent user group we have two upcoming events.  Both are to be held at F-Keys Training suite http://f-keys.co.uk/ in Rochester, Kent. If you haven’t attended before please note the location here. 14-June Is your code S.O.L.I.D ? Nathan Gloyn Everybody keeps on about SOLID principles but what are they? and why should you care? This session is an introduction to SOLID and I'll aim to walk through each principle telling you about that principle and then show how a code base can be refactored using the principles to make your life easier, Come the end of the session you should have a basic understanding of the principle, why to use it and how using it can improve your code. Building composite applications with OpenRasta 3 Sebastien Lambla A wave of change is coming to Web development on .NET. Packaging technologies are bringing dependency management to .NET for the first time, streamlining development workflow and creating new possibilities for deployment and administration. The sky's the limit, and in this session we'll explore how open frameworks can help us leverage composition for the web. Register here for this event http://www.eventbrite.com/event/1643797643 05-July Tony Rogerson Achieving a throughput of 1.5Terabytes or over 92,000 8Kbyte of 100% random reads per second on kit costing less that 2.5K, and of course what to do with it! The session will focus on commodity kit and how it can be used within business to provide massive performance benefits at little cost. End to End Report Creation and Management using SQL Server Reporting Services  Chris Testa-O'NeillThis session will walk through the authoring, management and delivery of reports with a focus on the new features of Reporting Services 2008 R2. At the end of this session you will understand how to create a report in the new report designer. Be aware of the Report management options available and the delivery mechanisms that can be used to deliver reports. Register here for this event http://www.eventbrite.com/event/1643805667 Hope to see you at one or other ( or even both if you are that way inclined).

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• Using Vim on the ipad... Any tips?

  - by pax1728

  I'm itching to program on my ipad. With the iSSH app I was able to log on to my university's server and even open an X server window. Unfortunately, the experience within iSSH is still rather clumsy. When using vim, the bottom line is hidden by the keyboard. Does anyone have any experience with SSH connections and the ipad or iphone? Are there better applications to use? I would prefer not to jailbreak my ipad.

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• Web Sites All Start When Debugging a Web Site - Visual Studio 2010

  - by Daniel Lackey

  I wanted to blog about this because it was an annoyance to me and I couldn't figure out why for quite some time. Have you ever tried debugging one web application in your solution but when you do, all other web sites in your solution build and then start up their respective Visual Studio Development Server? It's not a major problem, but it adds time to waiting for what you are actually trying to debug to start up. After digging through Visual Studio 2010 settings, I finally found the option to turn it off. It is called Always Start When Debugging and is located in the Properties pane for the web project (click on the project .proj file in Visual Studio IDE). This is set to True by default each time you create a new Web Application project. Setting this to false will solve your problems. You will need to set this to false for all web applications in your solution as shown below: In addition, you can set properties on which port the development server uses each time it debugs. This is helpful if you want the port to stay the same for testing purposes. In contrast, you can set it to use a dynamic port each time so if you have a co-worker that is debugging it on a different session on the same server, you won't run into any problems with using the same port. The machine won't allow you to debug two sessions on the same port. Pretty basic stuff but it seemed like a really quirky setting to me.

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• How to remove "com.starfield.backupservice" from launchd?

  - by user556623

  I remember sometime ago, I uninstall an application called starfield, but probably I didn't do a clean uninstall. Now in Console, I always see a annoying message: com.apple.launchd[1] (com.starfield.backupservice[4441]) Exited with exit code: 1 com.apple.launchd[1] (com.starfield.backupservice) Throttling respawn: Will start in 10 seconds com.apple.launchd[1] (com.starfield.backupservice[4442]) posix_spawn("/Applications/Starfield/BackupService/offSyncService", ...): No such file or directory I know it could be something wrong with my installation, how can I do a clean uninstall now, or just fix this issue, I don't want to see this message from my console any more. Thanks.

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• Firefox dependencies problem on 12.10

  - by theshu

  I did a fresh install of Ubuntu 12.10 today and now am getting the following error: You might want to run 'apt-get -f install' to correct these. The following packages have unmet dependencies: firefox-globalmenu : Depends: firefox (= 17.0.1+build1-0ubuntu0.12.10.1) but 16.0.1+build1-0ubuntu1 is installed E: Unmet dependencies. Try using -f. When I run the sudo apt-get -f install...I get the following after I type the "y": (Reading database ... 179765 files and directories currently installed.) Preparing to replace firefox 16.0.1+build1-0ubuntu1 (using .../firefox_17.0.1+build1-0ubuntu0.12.10.1_i386.deb) ... Unpacking replacement firefox ... dpkg-deb (subprocess): decompressing archive member: internal gzip read error: '<fd:4>: incorrect data check' dpkg-deb: error: subprocess <decompress> returned error exit status 2 dpkg: error processing /var/cache/apt/archives/firefox_17.0.1+build1-0ubuntu0.12.10.1_i386.deb (--unpack): cannot copy extracted data for './etc/apparmor.d/usr.bin.firefox' to '/etc/apparmor.d/usr.bin.firefox.dpkg-new': unexpected end of file or stream Please restart all running instances of firefox, or you will experience problems. Processing triggers for bamfdaemon ... Rebuilding /usr/share/applications/bamf.index... Processing triggers for desktop-file-utils ... Processing triggers for gnome-menus ... Processing triggers for man-db ... Errors were encountered while processing: /var/cache/apt/archives/firefox_17.0.1+build1-0ubuntu0.12.10.1_i386.deb E: Sub-process /usr/bin/dpkg returned an error code (1) This error is preventing me from installing Synaptic package manager and is also preventing me from installing anything with the Software center or Update manager. I tried uninstalling Firefox and also upgrading Firefox to no avail as well. Open to suggestions.

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• Software for video subscription service

  - by Clinton Blackmore

  I'd like to sell instructional videos over the web. Primarily, I'd like uses to subscribe to the site and be allowed access to videos over the internet. Secondarily, I might sell DVDs for those who have poor internet connections or would like a physical copy, or possibly I'd sell eBooks and the like in the future. Regarding the subscriptions: I'd like a system that automatically sends out e-mails when it is time to renew I'd like to be able to offer free trials Users without a free trial or subscription should not be able to access the content Incidentally, I plan to host videos on my current web host and move them to a CDN when volume (and capital) make this a good idea. While I have no intention to go crazy with the DRM, it seems expedient not to directly link to the files -- how can I link to them indirectly? It would be nice to support multiple payment processors -- specifically, I'd like to avoid a PayPal only approach. Are there any web applications (or plugins) you'd recommend for something like this? While I've set up and administered several web technologies, I've never done anything with e-commerce. I see there are possibilities like osCommerce, one friend recommends using WordPress with plugins, and it really appears that for any given CMS, you can graft on components like this, although I imagine that not all are created equal. As I'm not tied to a particular web application (and, while open source software that can run on a LAMP [p=perl, python, php] stack is preferable), I'd like to make a good choice at the beginning.

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• Cygwin won't start Gitk

  - by starcorn

  Hey I have followed this answer to solve problem with running GUI applications under Cygwin. So far it seems okay, but when I try to open gitk it will complain on that it cannot find any git repository here. I am standing in the correct folder though, and running git from console it works (I can push, pull, and so on) But gitk won't start as it say it is not any git repository here. Anyone know how to fix it? I type the following to the console. gitk And the output I get is: 0 [main] wish8.5 2260 child_info_fork::abort: C:\cygwin\bin\libtcl8.5.dll: Loaded to different address: parent(0x520000) != child(0x410000) 0 [main] wish8.5 4332 child_info_fork::abort: C:\cygwin\bin\libtcl8.5.dll: Loaded to different address: parent(0x520000) != child(0x560000) 0 [main] wish8.5 4716 child_info_fork::abort: C:\cygwin\bin\libtcl8.5.dll: Loaded to different address: parent(0x520000) != child(0x410000) 0 [main] wish8.5 4724 child_info_fork::abort: C:\cygwin\bin\libtcl8.5.dll: Loaded to different address: parent(0x520000) != child(0x410000)

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• Allow Single IP to access ASP.NET Web Service (ASMX) using Firewall

  - by Suresh Agrawal

  I have one asp.net web service (asmx) in separate project that is hosted on windows server having other asp.net web applications running on it. How can I restrict asp.net web service to be accessed by single IP address? I want that my web service must be accessed by one IP configured by me. If requests comes from any other IP, it must not reach to my web service and discarded by windows firewall itself. I know that this is something to do with windows firewall. I did it for SQL Server previously, but I don't know how to configure single asp.net web service project to do so.

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• asp.net mvc vs angular.js model binding

  - by aw04

  So I've noticed a trend lately of .net web developers using angular.js on the client side of applications and I've become more curious as I play around with angular and compare it to how I would do things in asp.net mvc. I'll give a quick example of what really got me thinking. I recently came across a situation at work (I work in a .net environment) where I needed to create a table bound to a collection of objects that had the ability to add and remove rows/items from the collection. I had an add button that created a new object and appended a row to the end of the table, and a remove button in each row to remove a particular object/row. Using asp.net mvc, I first found myself making an ajax call to the server for each operation, updating the server side model, and refreshing part of the page to show the result in the table. This worked but I didn't really like the idea of calling the server to update the model each time, so I tried to come up with a solution to do this on the client side. It turned out to be quite a task, as I had to generate the html on add with validation and all and the correct indexing for the model binding to work. It got worse on remove, as I ended up with a crazy string replace function to recreate the indexes on each item to satisfy the binding requirements (if an item other than the last is removed, the indexes are no longer correct). Now out of curiosity, I tried to recreate this at home in angular (which I had no experience with) and it took me all of about 10 minutes with simple functions to add and remove items from the client side model. This is just one example, but it seems to me that I'm able to achieve the same results with far fewer calls to the server in angular because of the fact that it binds to a client side model. So my question is, is this a distinct advantage of using a javascript mvc framework or am I somehow under utilizing the power of asp.net mvc and am I right in thinking that these operations should be done on the client and have no business requiring calls to the server?

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• Need help deciding if Joomla! experience as a good metric for hiring a particular prospective employee.

  - by Stephen

  My company has been looking to hire a PHP developer. Some of the requirements for the job include: an understanding of design patterns, particularly MVC. some knowledge of PHP 5.3's new features. experience working with a PHP framework (it doesn't matter which one). I interviewed a man today who's primary work experience involved working with Joomla!. As an employee, he will be required to work on existing and new web applications that use Zend Framework, CakePHP and/or CodeIgniter. It is my opinion that we shouldn't dismiss hiring a developer just because he has not used the same technologies that he'll be using on the job. So, I'd like to know about the kind of coding experience working with Joomla! can provide. I've never bothered to take more than a brief look (if that) at the Joomla! package, so I'm hoping to lean on the knowledge of my peers. Would you consider Joomla! to contain a professional code-base? Is the package well organized, and/or OO in general, or is it more like WordPress where logic and presentation are commingled? When working with Joomla!, is the developer encouraged to use best practices? In your opinion, would experience working with Joomla! garner the skills needed to get up to speed with Zend or CakePHP quickly, or will there be a steep learning curve ahead of the developer? I'm not saying that Joomla! is a bad technology, or even that it is lower on the totem pole when compared to the frameworks I've mentioned. Maybe it's awesome, I dunno. I simply have no idea!

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• Where should SQL/DB Queries be encapsulated in a software system?

  - by Stephen Bennet

  I frequently write small applications (either web based or otherwise) that require heavy database usage. i've attempted various ways of handling where to put the actual sql queries (sort of ad-hoc ORM systems). These include: Models that build themselves up - and only allowing SQL to be inside of a model. A sort of factory style method where the models are built by a factory class that is allowed to know about SQL. A third entity that maps models based on their fields/keys into the database and generates SQL code on the fly based on this. Is there a common knowledge of which method is best? Or another way I have missed? Clearly a lot of it will be based on the context of the system itself, which for me is usually to produce lightweight tools or utility frameworks. In experimenting, I've never found any of them that feel intuitively "right" and not clunky, but I also do not want to go for a full framework such as Django or Ruby - both because the tools I create are in a variety of languages and because they usually do not warrant that level of surrounding footprint.

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• Podcast Show Notes: Public, Private, and Hybrid Clouds

  - by Bob Rhubart

  This week the OTN ArchBeat Podcast begins a four-part series featuring a panel of some of Oracle's top cloud experts in a conversation about the similarities and differences between, public, private, and hybrid clouds. The Panelists Dr. James Baty Vice President of Oracle’s Global Enterprise Architecture Program, and a frequent speaker at OTN Architect Days and other events. Mark T. Nelson Lead architect for Oracle Cloud and is responsible for designing the infrastructure for Oracle's public Software as a Service, and Platform as a Service offerings. Ajay Srivastava Vice President of Oracle’s On Demand Platform. William Vambenepe Architect for Oracle’s Middleware/Applications Management and Cloud Computing. The Conversation Listen to Part 1: The panel offers an overview of the various flavors of cloud computing. Listen to Part 2 (June 13): Cows in the cloud and the importance of standards. Listen to Part 3 (June 20): Why cloud computing is a paradigm shift -- and why it isn’t. Listen to Part 4 (June 27): Advice on what architects need to know to take advantage of the cloud. Coming Soon Highlights from the Roundtable Discussion at OTN Architect Day in Reston, VA. An expert panel discusses the role of the Cloud Architect. Stay tuned: RSS

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• The Apple Passbook

  - by David Dorf

  In a previous job I worked on smart card systems.  Our vision was to replace the physical wallet with a chip card that contained stored value, credit cards, and loyalty cards.  The technology was up to the task, but the business model never worked out.  When all those things go onto a single card, who owns the card and maintains the applications?  Each bank wanted their own card with branding, so instead of consolidating lots of cards onto one, we ended up with the same number of cards, just more expensive chip cards.  The Costanza wallet would not die. More recently I've been able to move lots of these cards into iOS apps using products like CardStar, TripIt, and Fandango.  I guess moving from physical to digital is progress, but still no consolidation.  But this week Apple announced its Passbook, an iOS feature that consolidates boarding passes, loyalty cards, and movie tickets.  Another step in the right direction. We've been waiting for Apple to announce a NFC solution to take advantage of the 400 million credit cards it stores in iTunes for its customers.  Perhaps Passbook is the first step in that direction.  It wouldn't take much to add credit cards to Passbook, then enable secure transfer of the track data using a NFC equipped iPhone.  I've got to think this has to be part of the larger vision, but of course Apple is very secretive. I think the steps will be loyalty, coupons, and then payment when it comes to the evolving Passbook.  Retailers should keep an eye on Apple, and expect these things to happen in the Apple stores first.

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• Camunda BPM 7.0 on WebLogic 12c

  - by JuergenKress

  If we go on tour together with Oracle I think we have to have camunda BPM running on the Oracle WebLogic application server 12c (WLS in short). And one of our enterprise customers asked - so I invested a Sunday and got it running (okay - to be honest - I needed quite some help from our Java EE server guru Christian). In this blog post I give a step by step description how run camunda BPM on WLS. Please note that this is not an official distribution (which would include a sophisticated QA, a comprehensive documentation and a proper distribution) - it was my personal hobby. And I did not fire the whole test suite agains WLS - so there might be some issues. We will do the real productization as soon as we have a customer for it (let us know if this is interesting for you). Necessary steps After installing and starting up WLS (I used the zip distribution of WLS 12c by the way) you have to do: Add a datasource Add shared libraries Add a resource adapter (for the Job Executor using a proper WorkManager from WLS) Add an EAR starting up one process engine Add a WAR file containing the REST API Add other WAR files (e.g. cockpit) and your own process applications Actually that sounds more work to do than it is ;-) So let's get started: Add a datasource Add a datasource via the Administration Console (or any other convenient way on WLS - I should admit that personally I am not the WLS expert). Make sure that you target it on your server - this is not done by default: Read the full article here. For regular information become a member in the WebLogic Partner Community please visit: http://www.oracle.com/partners/goto/wls-emea ( OPN account required). If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Mix Forum Wiki Technorati Tags: Camunda,BPM,JavaEE7,WebLogic Community,Oracle,OPN,Jürgen Kress

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• Space a valid delimiter for email addresses in email header?

  - by semanticalo

  Is it syntactically correct to delimit multiple email recipients in the "To" header of an email with spaces only or do I need to use another delimiter (a semicolon or the like)? Example (MIME data reads as follows): Date: Mon, 04 Oct 2010 06:14:16 +0200 From: [email protected] To: [email protected] [email protected] [email protected] Subject: Test Subject The above will be processed by many email processing applications, but I need to know whether it's correct according to standard (RFC). Unfortunately I didn't find anything useful on the internet so far. Thanks a million for your help!

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• Enable dtrace without sudo on Mac OS X?

  - by Juan

  How do I enable users to use dtrace on Mac OS X. I am trying to do the equivalent of strace on Linux, and I don't like running applications with elevated privileges. UPDATE Ok, the best I can tell. The only way to keep a nefarious application from ruining the system by debugging it is to. Attach to the process in a separate console Use sudo twice So that: sudo dtruss sudo -u myusername potentially_harmful_app I verified this with this short program: #include <iostream> #include <unistd.h> int main() { std::cout << "effective euid " << geteuid() << "\n"; } See this discussion for more info: http://discussions.apple.com/message.jspa?messageID=6430877

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• Is the difference between sudo and gksu the same as the difference between sudo -i and sudo -s?

  - by fred.bear

  Is the difference between sudo cmd and gksu cmd, the same as the difference between starting a shell with sudo -i and sudo -s? ... or put another way, Is sudo cmd the same as sudo -i cmd and gksu cmd the same as sudo -s cmd? EDIT: Based on what I read on an Ubuntu Documentation Page where it says: You should never use normal sudo to start graphical applications as root. You should use gksudo (kdesudo on Kubuntu) to run such programs. gksudo sets HOME=~root, and copies .Xauthority to a tmp directory. This prevents files in your home directory becoming owned by root. (AFAICT, this is all that's special about the environment of the started process with gksudo vs. sudo). The "AFAICT" doen't really give me full confidence that there is nothing more to it. (..a belated UPDATE: I tested his commemnt today (2 months later) about: "This prevents files in your home directory becoming owned by root." All files I created via sudo/gksu were all owned by "root", and the group was "root".) I've read parts of the info sudo and noticed the -i and -s seem to be doing the same thing as the AFAICT environment issue... but I hit overload.. so I've asked my question here. PS.. My question is not about sudo vs gksu .. It is more about: Is gksu the same as sudo -s .. and if not, how do they differ?

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• A PDF viewer for large margins in fullscreen

  - by jmn

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

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• I have 5 days of vouchers for MS training… help me choose? [closed]

  - by Shyatic

  I'm a Microsoft centric guy (systems engineering side) and I already know the syntax of VB, have done VBScript pretty extensively and Excel VBA stuff as well. I want to make the leap into proper programming, probably with C# because it teaches me syntax I can use for Java if I want to go that route at some point. Since I have vouchers for 5 days of programming, and I can understand logic and understand how the .NET framework works... I would love to hear ideas on which MS Courses I should take. My primary focus is to work on web applications with web services that interact and do neat stuff... like for example, to create a 'chat' room or something interactive on the web. Or should I do something with HTML5/JS? I am really not sure... like I said, I want to work to make web services/sites. Not making the next Facebook mind you, but I'd like to work towards something in that spectrum on a much smaller scale. Please give me any advice, I'd like to book these classes asap Obviously getting involved with SQL and things that I will require would be important here.. you guys know better than me! Thanks!

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• The Other "C" in CRM

  - by [email protected]

  By Brian Dayton on April 5, 2010 7:04 PM Folks who know me know that I rarely, if ever, talk politics. And I never talk politicians. Having grown up in a household with one parent leaning left and the other leaning to the right it was the best way to keep the peace. This isn't about politics. It's about "constituents" and the need to improve the services and service levels for people--at the city, county, state/province, etc. level all the way up to national governments. As a citizen and tax payer it's also important to me that these services be provided at a reasonable cost. If there's a better and more efficient way to do something then it's my hope that a public sector organization takes advantage of technology the same way private sector companies do. Social services organizations have a complex job. They provide the services that people need, from healthcare and children's assistance to helping people find jobs. But many of these organizations are still managing these processes manually or outdated, home-grown applications that could have been written up to 30 years ago. A lot has changed in technology. On the (this is as political as I'm going to get) political front, stakeholders like you and me are expecting greater transparency on where and how funds are spent. I'll admit that most of the time, when I think about CRM systems, I think about my experience as a customer of my bank, utilities company or cable operator. But now that I'm older, have children and a house--I find myself interacting more and more with agencies and services organizations. My experiences are sometimes good and sometimes not so good. Along those lines, last week's announcement of Siebel CRM 8.2 for Public Sector caught my eye. You may not work in the public sector, but you are a constituent of some--actually a lot--of public sector organizations. I don't know which CRM systems city and county utilize but I'm going to start paying closer attention.

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• How to use iTunes USB File Transfer to copy files from PC to Apple iPad, e.g. PDF files for viewer a

  - by Chris W. Rea

  I'm interested in reading PDF-format ebooks on my Apple iPad. I have half a gig of PDFs I want to transfer to it, from my PC. I'm familiar already with loading EPUB-format titles through iBooks – unfortunately, iBooks doesn't read PDFs so I am looking at using a third-party application. I know many such third-party media viewer applications for the iPad support download from web or email, but that's a hassle. I've heard iTunes 9.1 added support for USB File Transfer, specifically for iPad devices. How does USB File Transfer work in iTunes, for transferring files from my PC to my iPad? Please provide example steps. Moderators: Please remember the FAQ's "except insofar as they interface with your computer." ;-)

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• 10 Tech Products Ahead of Their Time [Video]

  - by Jason Fitzpatrick

  Sometimes a product just can’t help but be too far ahead of it’s time to be adopted. Check out these 10 products that had their moment of glory a moment (or a decade) too soon. At Mashable they’ve gathered up 10 products that hit the market too soon for people to really appreciate them. Among them, as seen in the video above, a super simple internet-focused computer. At the time it hit the market people simply didn’t get the value of having a cheap, easy to use internet terminal. It probably didn’t help much that the 1990s internet didn’t have the plethora of powerful and useful web-based applications we have now. None the less we now have tons of lightweight and “underpowered” devices focused on the internet experience (like netbooks, iPads, smart phones, chromebooks, and more). Hit up the link below to see the 9 other gems from their collection of products ahead of their times. 10 Tech Products Ahead of Their Time [Mashable] How to Make and Install an Electric Outlet in a Cabinet or DeskHow To Recover After Your Email Password Is CompromisedHow to Clean Your Filthy Keyboard in the Dishwasher (Without Ruining it)

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• Is comparing an OO compiler to a SQL compiler/optimizer valid?

  - by Brad

  I'm now doing a lot of SQL development at my new job where as before I was doing Object Oriented desktop app stuff. I keep running across very large scripts (thousands of lines) and wanting to refactor in some way. I am seeing that SQL is a different sort of beast and it's probably fine to have these big scripts for the most part but while explaining this to me people are also insisting that the whole idea of refactoring is bad. That stuff like the .NET compiler are actually burdened by refactored code and that a big wall of code is more efficient and better design than code designed for reuse, readability and scalability. The other argument is that OO compilers are almost dangerously inefficient and don't have efficient memory management or runs too many CPU instructions compared to older "simpler" compilers and compared to SQL. Are these valid complaints? Even if some compiler like a C compiler is modestly more "efficient" (whatever that means on this high of a level without seeing code) would you want to write applications in C over C# or Java? Is comparing an OO compiler to a SQL compiler/optimizer even valid?

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• Analyzing Linux NFS server performance

  - by Kamil Kisiel

  I'd like to do some analysis of our NFS server to help track down potential bottlenecks in our applications. The server is running SUSE Enterprise Linux 10. The kind of things I'm looking to know are: Which files are being accessed by which clients Read/write throughput on a per-client basis Overhead imposed by other RPC calls Time spent waiting on other NFS requests, or disk I/O, to service a client I already know about the statistics available in /proc/net/rpc/nfsd and in fact I wrote a blog post describing them in depth. What I'm looking for is a way to dig deeper and help understand what factors are contributing to the performance seen by a particular client. I want to analyze the role the NFS server plays in the performance of an application on our cluster so that I can think of ways to best optimize it.

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