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  • How do UEFI and virtual machines relate to each other?

    - by Iterator
    I am trying to get my head around UEFI (Unified Extensible Firmware Interface) and it's not entirely clear to me how this affects virtual machines. Thus, there are three parts to this question: Is UEFI an advance in hardware support for virtualization? All other things being equal, would a machine with UEFI be more likely to run a virtual machine more efficiently than one without, or does UEFI cause any performance hits that negate any speed improvements from a virtual machine? Would the difference in execution be visible to code running in a virtual machine? (In theory, it shouldn't, but in practice?)

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  • A compiler for automata theory

    - by saadtaame
    I'm designing a programming language for automata theory. My goal is to allow programmers to use machines (DFA, NFA, etc...) as units in expressions. I'm confused whether the language should be compiled, interpreted, or jit-compiled! My intuition is that compilation is a good choice, for some operations might take too much time (converting NFA's to equivalent DFA's can be expensive). Translating to x86 seems good. There is one issue however: I want the user to be able to plot machines. Any ideas?

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  • load table data on jsp using struts2 with fixed table structure

    - by Zahra
    Hi. I want to have a fixed table structure on my jsp page(3row, 4column). but I want to load data for this table from DataBase with using struts 2. I know if my table structure wasn't fixed I could have just get a List and iterate on it and add a data in every iteration, but how could I do this in this case. also if I don't have enough data to fill table, I want those places to be empty. I didn't find a good example, if you could help me or introduce me a good tutorial, it would be really appreciated. Thanks in advance.

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  • Netlink user-space and kernel-space communication

    - by sasayins
    Hi, I am learning programming in embedded systems using Linux as my main platform. And I want to create a Device Event Management Service. This service is a user-space application/daemon that will detect if a connected hardware module triggered an event. But my problem is I don't know where should I start. I read about Netlink implementation for userspace-kernelspace communication and it seems its a good idea but not sure if it is the best solution. But I read that the UDEV device manager uses Netlink to wait a "uevent" from the kernel space but it is not clear for me how to do that. I read about polling sysfs but it seems it is not a good idea to poll filesystem. What do you think the implementation that should I use in my service? Should I use netlink(hard/no clue how to) or just polling the sysfs(not sure if it works)? Thanks

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  • Configuring IoC container from modules/plug-ins ?

    - by rouen
    Hi guys, i am in big dilema.. I am working on highly modular web app in ASP.NET MVC 2 (in fact, core will be super lightweight, all work on modules/plugins). I found MEF pretty useful for modules discovery, but i dont want to us it as IoC container. There is pretty good chance that I will need advanced features of "true" IoC container, so I would like to use Unity. And here is the problem : how to allow modules to configure container (programatically) = register their own types (mvc controllers, custom implementations of services...) at application start without making hard dependency on Unity in all modules ? I know about Common Service Locator project, and it seems pretty good, but this interface co container only allows resolving types, not registering them (afaik). I really hope you can understand my point, I know my english is terrible (I am from non english speaking country :) Thanks a lot !

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  • Should server spare parts be stored in climate controlled storage?

    - by Shane Wealti
    What is a best practice for storing server spares (hard drives, RAM, power supplies, etc) with respect to how/where they are stored? Some options are storing them in climate controlled storage or just a standard warehouse-type stockroom? My understanding is that all other things being equal climate-controlled storage is preferred. What are the risks of storing that type of thing in a non-climate-controlled, somewhat dusty shelving area? Conversely are there risks to storing spares in a climate controlled area? If there are space limitations in climate controlled storage are there some parts, such as hard drives, which should be in climate controlled, while other parts such as power supplies will probably be ok in non climate controlled storage?

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  • Web UI for showing like/dislike community comments side-by-side

    - by Justin Grant
    We want to add a comments/reviews feature to our website's plugin gallery, so users can not only vote up or down a particular plugin, but also leave an optional short comment about what they liked or didn't like about it. I'm looking for inspiration, ideally a good implementation elsewhere on the web which isn't annoying to end users, isn't impossibly complex to develop, and which enables users to see both good and bad comments side-by-side, like this: Like: 57 votes Dislike: 8 votes --------------------------------- -------------------------------- "great plugin, saved me hours..." "hard to install" "works well on MacOS and Ubuntu" "Broken on Windows Vista with UAC enabled" "integrates well with version 3.2" More... More... Anyone know a site which does something like this?

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  • DNS settings for SaaS in the cloud?

    - by Jeremy
    I am building a SaaS product. When a user signs up for an account they must select an alias for their site --------.getlaunchpoint.com. Right now I have an A record *.getlaunchpoint.com that points to the ip address server. However, with Azure I am not given an IP address. The suggested implementation is to make use of a CNAME. I need to create a CNAME for *.getlaunchpoint.com - getlaunchpoint.cloudapp.net GoDaddy does not support CNAME wildcards. Searching on Google I'm getting conflicting information... is CNAME wildcard a bad practice? I run into the same problem with Amazon EC2 if I want to make use of load balancers because you cannot tie a public IP address to an Amazon Load Balancer. Amazon also suggests the use of a CNAME. Any help would be appreciated.

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  • Beginner's resources/introductions to classification algorithms.

    - by Dirk
    Hi, everybody. I am entirely new to the topic of classification algorithms, and need a few good pointers about where to start some "serious reading". I am right now in the process of finding out, whether machine learning and automated classification algorithms could be a worthwhile thing to add to some application of mine. I already scanned through "How to Solve It: Modern heuristics" by Z. Michalewicz and D. Fogel (in particular, the chapters about linear classifiers using neuronal networks), and on the practical side, I am currently looking through the WEKA toolkit source code. My next (planned) step would be to dive into the realm of Bayesian classification algorithms. Unfortunately, I am lacking a serious theoretical foundation in this area (let alone, having used it in any way as of yet), so any hints at where to look next would be appreciated; in particular, a good introduction of available classification algorithms would be helpful. Being more a craftsman and less a theoretician, the more practical, the better... Hints, anyone?

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  • Best .NET Framework compression class?

    - by Jack
    Hi all Yes, I know GZipStream or DeflateStream is the common ones in .NET Framework which handle compression/decompression. I wish to have compress/decompress functions in my program, but I wish a .NET Framework C# one, not a 3rd party open source. I can't use because of those copyright restrictions in my program. GZipStream and DeflateStream are not so good. for e.g., GZipStream compress a file to 480KB while 7Zip compress the same file to the size of 57KB. Does Microsoft have other good compression methods??? Thanks

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  • ruby / rails boolean method naming conventions

    - by Dennis
    I have a short question on ruby / rails method naming conventions or good practice. Consider the following methods: # some methods performing some sort of 'action' def action; end def action!; end # some methods checking if performing 'action' is permitted def action?; end def can_action?; end def action_allowed?; end So I wonder, which of the three ampersand-methods would be the "best" way to ask for permissions. I would go with the first one somehow, but in some cases I think this might be confused with meaning has_performed_action?. So the second approach might make that clearer but is also a bit more verbose. The third one is actually just for completeness. I don't really like that one. So are there any commonly agreed-on good practices for that?

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  • Server memory issues, and expected level of service from hosting company

    - by Greg
    I'm involved in maintaining an Ubuntu VPS which runs our django websites (nginx/apache/mod_wsgi) and we've been having some memory spikes which have either caused the database to die, or induced kernel panic when the memory management system can't find any killable processes. I'm working on fixing the memory spikes, but I'm wondering whether there's anything I can do to better deal with the problem if it occurs again. Are there any tools I could use to detect the memory spikes and then, say, kill the offending process and email the server admin to fix it up? Killing off one website so that the server can remain operational is certainly preferable to the whole thing falling over. Also, we were charged $600 for after-hours service because we had to get the hosting company to restart the server - is this standard practice among hosting companies? Another provider I work with provides a panel with which I can stop and start the server myself, and given that a restart was all that was needed, $600 seems mightily excessive. (That's NZD, it's around $445 USD)

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  • File replication among EC2 instances

    - by Peuge
    I am pretty new to AWS so please excuse my ignorance. We are wanting to have a setup whereby we have a SQL DB instance + web server instance. However we would like the Web server to sit behind an ELB thus allowing us to use Autoscaling. My question however is how to we replicate the web app across instances? Say for example we have two web servers running and we need to make a critical update to the web app, ultimately we would only want to upload to one instance and not both. Is it even best practice to store your web app on the instance or are there better ways to store and share the app between instances?

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  • How to learn Haskell

    - by anderstornvig
    For a few days I've tried to wrap my head around the functional programming paradigm in Haskell. I've done this by reading tutorials and watching screencasts, but nothing really seems to stick. Now, in learning various imperative/OO languages (like C, Java, PHP), excercises have been a good way for me to go. But since I don't really know what Haskell is capable of and because there are many new concepts to utilize, I haven't known where to start. So, how did you learn Haskell? What made you really "break the ice"? Also, any good ideas for beginning excercises?

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  • Lablgtk2 Installation on Windows.

    - by Animesh
    Hi there people, I am currently relearning Ocaml and am in the need of a good editor. There is a new editor from OcamlForge: OCamlEditor http://ocamleditor.forge.ocamlcore.org/. Prerequisite for installation is Lablgtk2. Installing Lablgtk2 on windows is not straight forward and there is good instruction here: http://wwwfun.kurims.kyoto-u.ac.jp/soft/lsl/install-win32.txt I have completed the first two steps and in the third step, as warned, it is failing on the native code version. This is where I am left stranded. How do I check to see if the assembler is on my path? What am I missing here? Please help me move forward from this point. Sincere thanks. Animesh

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  • Using a Kanban board per developer

    - by grimus
    I have been trying to get our software department to adopt some kind development process methodolgy. We only have 9 developers, and about as many projects. Currently, we can only be described as chaotic. Or perhaps 'crisis driven development' as I've seen another SO user call it. Using Kanban seems like a it could be a good fit for us. So I've discussed it with everyone else, everyone thought it sounded good. But when we discussed how the board(s) should be arranged, everyone wanted to do one board per person. Now, I've never tried Kanban, or any methodology really, but it feels like having each person managed on their own board would negate the benefits a Kanban process is supposed to provide. This notion makes me sad, and want to say 'ho-hum let's scrap this whole idea.' Do you think implementing a Kanban board per developer can be worthwhile?

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  • How to explain to a client that you've gone over-budget and you'll need more money/time to deliver w

    - by General Tapioca
    My situation is that I have agreed on a per-project proposal with the client. The proposal is vague, but still names functionality in a way that can be argued as to whether it's included or not, while leaving some room for interpretation. I originally pressed as much as I could to get a per-month contract, arguing that the project is mostly non-predictable, but the client refused. Being a small company, I had to fold and signed a contract on an estimate based on my group's estimations. At this point we have reached completion on about 85% of the features (we think) but we ran out of budget. We have been working for almost two years with this client in previous contracts, and we have delivered a good product that they are happy with, so we have a good standing relationship. More info: -There has been a bit of scope-creep, but I don't think enough for me to hide behind that argument -We've been delivering partial releases about monthly. -We don't have systematic user-testing in place.

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  • Best way to structure AJAX for a Zend Framework application

    - by John Nall
    Sorry, but there's a lot of outdated and just plain bad information for Zend Framework, since it has changed so much over the years and is so flexible. I thought of having an AJAX module service layer, with controllers and actions that interact with my model. Easy, but not very extensible and would violate DRY. If I change the logistics of some process I'll have to edit the AJAX controllers and the normal controllers. So ideally I would load the exact same actions for both javascript and non-javascript users. I have thought about maybe checking for $_POST['ajax'], if it is set I would load a different (json'y) view for the data. Was wondering how/a good way to do this (front controller plugin I imagine?) or if someone can point me to an UP TO DATE tutorial that describes a really good way for building a larger ajax application. thx

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  • TCP connection between PCs in home wi-fi network

    - by Nordvind
    I want to establish a connection between 2 PCs. Point is to practice in writing client-server applications and similar stuff. I've heard around, that I can access another PC in network by address like "Router IP:port number". Am I right or i got it wrong? So how do I configure router to let connections to certain ports? And what would address look like, if I'm, say, connecting to 80 port on my home server? P.S. Will be grateful for links to some tutorials on this matter, if any.

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  • Ideas of subjects for Diplomas for students who are getting Network Engineering degree

    - by wik
    Looking for an ideas and solutions of possible problems to be used as a part of pre-diploma practice for students who getting Network Engineering degree. The important requirement: The problem must be solved by designing new device or software which incorporate(or improve) with existent device. It's could be something industry specific, particular problem, etc. Thanks. p.s. The time for writing diploma is also limited by few month here, i.e. it's will be hard to solve very complex problems, but would be nice to hear something fresh :)

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