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  • best way to go about cost-benefit analysis on hardware

    - by Michael
    I'm looking to build a low-end computational server (my jargon in this field is especially limited so if someone can state that better please change that to meet jargon). I'm basically running computational fluid dynamics programs, large matrix computations and bioinformatics code. What would be the best way to approach cost/benefit analysis on what to put in the system? Perhaps even more general: How does one approach cost/benefit analysis on hardware theoretically (doing the analysis before building the machine)?

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  • SOM for Detection

    - by Tim
    I would like to know how I can use SOM for disease detection. Given a lung cancer dataset, how can SOM be applied for detection, there are certain terminologies like, sensitivity, specificity and accuracy percentages....are there ways to calculate all these with the SOM algorithm? I would appreciate answers from anyone who can shed more light on this

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  • Toolbox for Computer Hardware

    - by Chuy77
    I have a lot of computer hardware (hard drives, cables, etc.) and I need a better way to organize. Could anyone recommend a toolbox intended for this sort of thing, or some other good method for storage? I have a two drawer wide file that I currently use, with large plastic bags. It works okay, but I need a better system. Thanks for any advice.

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  • Workstation hardware at does your company buy developers?

    - by Bosh
    I'm curious to know what workstation hardware companies are devoting to you, as a developer -- and how much they're spending. I'd consider this thread a big success if I could shed some light on these questions: Do engineers at big companies use substantially different hardware than engineers at start-ups companies? Does a fresh developer recruit at Google get substantially different hardware from someone in the same position at Microsoft or Yahoo!? Do programmers in more senior positions have more powerful hardware on their desks? Does anyone think faster hardware makes more efficient engineers?

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  • Feeding a Dog Remotely - hardware?

    - by RobDude
    I'm looking for a way to, remotely, activate some sort of treat dispenser. I'm not a hardware guy, and I'm sure that conceptually, this is very easy. But I don't know how to begin. I haven't found any products designed to do exactly this. Perhaps some sort of beginning robotics kit could do it?

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  • HP Proliant G7 hardware RAID configuration automation with ribcl

    - by karthik
    I have been trying to automate hardware RAID configuration of HP proliant machines before OS installation (So I can not use hpacucli) ssh into iLO3 doesn't have option for RAID configuration I use ribcl but there is no command for RAID config, however I see this under the command GET_EMBEDDED_HEALTH. <STORAGE> <CONTROLLER> <LABEL VALUE="Controller on System Board"/> <STATUS VALUE="OK"/> <CONTROLLER_STATUS VALUE="OK"/> <SERIAL_NUMBER VALUE="50014380215F0070"/> <MODEL VALUE="HP Smart Array P420i Controller"/> <FW_VERSION VALUE="3.41"/> <DRIVE_ENCLOSURE> <LABEL VALUE="Port 1I Box 1"/> <STATUS VALUE="OK"/> <DRIVE_BAY VALUE="04"/> </DRIVE_ENCLOSURE> <DRIVE_ENCLOSURE> <LABEL VALUE="Port 2I Box 0"/> <STATUS VALUE="OK"/> <DRIVE_BAY VALUE="01"/> </DRIVE_ENCLOSURE> <LOGICAL_DRIVE> <LABEL VALUE="01"/> <STATUS VALUE="OK"/> <CAPACITY VALUE="68 GB"/> <FAULT_TOLERANCE VALUE="RAID 0"/> <PHYSICAL_DRIVE> <LABEL VALUE="Port 1I Box 1 Bay 3"/> <STATUS VALUE="OK"/> <SERIAL_NUMBER VALUE="6TA0N3SZ0000B231CYDT"/> <MODEL VALUE="EH0072FAWJA"/> <CAPACITY VALUE="68 GB"/> <LOCATION VALUE="Port 1I Box 1 Bay 3"/> <FW_VERSION VALUE="HPDH"/> <DRIVE_CONFIGURATION VALUE="Configured"/> </PHYSICAL_DRIVE> </LOGICAL_DRIVE> </CONTROLLER> </STORAGE> My question is, is there a way I modify/create this xml piece (say I have 2 Logical drive with one spare) and reboot the server it takes effect ? If this approach is not correct are there any other ways to automate hardware raid config ?

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  • Diagnosing iMac Hardware?

    - by Covar
    Recently my first generation Intel iMac that I've had since 2006 has begun to lock up and restart on me. Before I run off and spend $1500-$2000 on a new iMac, is there any good way to diagnose the hardware? I would like to know exactly what is going wrong so I know I won't be wasting my money when there is an easier fix.

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  • Hardware needed for receiving and recording videcalls in Asterisk

    - by jneves
    I'm planning an Asterisk configuration that should record videocalls and then feed it to an application. From what I've researched, it seems like app_h234m is the way to go (http://www.voip-info.org/wiki/view/Asterisk+app_h324m+compatibility). But it's not clear to me what are the hardware requirements for this. Can someone enlighten me?

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  • Need a hardware solution for remote controling a PC

    - by ShacharWeis
    Hello We have kiosk computers scattered around the country, and are using VNC to control them. But VNC has limitations (only works if the OS is intact, for instance). I want to be able to control the computer even if it is stuck in boot. Is there a cheap hardware solution for remote controlling a PC ? Thanks.

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  • Oracle Linux and Oracle VM Hardware Certification Program

    - by Durgam Vahia
    The Oracle Linux and Oracle VM are continuing to see growth in IHV (Independent Hardware Vendor) ecosystem. The Oracle Linux and Oracle VM Hardware Certification Program, also referred as HCL, provides a formal means for hardware vendors to work with Oracle to establish high quality support for the certified hardware platform. Since the beginning of the program, number of hardware partners have certified range of server platforms on Oracle Linux and Oracle VM. Currently, HCL lists over 400 certifications from 10 server vendors and the list continues to grow at a rapid pace. New hardware certification involves close collaboration between Oracle and server partner to ensure that adequate testing is performed on the target server and results are thoroughly reviewed. This rigorous process ensures that when new hardware platform is listed on HCL, it has full support from both Oracle and the respective partner. Additionally, once a certification is achieved with Oracle Linux with the current version of Unbreakable Enterprise Kernel, future minor updates of the software continue to carry over the certification, reducing the need for a re-certification. For the complete list of certified hardware, please visit Oracle Linux and Oracle VM Certified Hardware. Also refer to Frequently Asked Questions for more information.

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  • Ball to Ball Collision - Detection and Handling

    - by Simucal
    With the help of the Stack Overflow community I've written a pretty basic-but fun physics simulator. You click and drag the mouse to launch a ball. It will bounce around and eventually stop on the "floor". My next big feature I want to add in is ball to ball collision. The ball's movement is broken up into a x and y speed vector. I have gravity (small reduction of the y vector each step), I have friction (small reduction of both vectors each collision with a wall). The balls honestly move around in a surprisingly realistic way. I guess my question has two parts: What is the best method to detect ball to ball collision? Do I just have an O(n^2) loop that iterates over each ball and checks every other ball to see if it's radius overlaps? What equations do I use to handle the ball to ball collisions? Physics 101 How does it effect the two balls speed x/y vectors? What is the resulting direction the two balls head off in? How do I apply this to each ball? Handling the collision detection of the "walls" and the resulting vector changes were easy but I see more complications with ball-ball collisions. With walls I simply had to take the negative of the appropriate x or y vector and off it would go in the correct direction. With balls I don't think it is that way. Some quick clarifications: for simplicity I'm ok with a perfectly elastic collision for now, also all my balls have the same mass right now, but I might change that in the future. In case anyone is interested in playing with the simulator I have made so far, I've uploaded the source here (EDIT: Check the updated source below). Edit: Resources I have found useful 2d Ball physics with vectors: 2-Dimensional Collisions Without Trigonometry.pdf 2d Ball collision detection example: Adding Collision Detection Success! I have the ball collision detection and response working great! Relevant code: Collision Detection: for (int i = 0; i < ballCount; i++) { for (int j = i + 1; j < ballCount; j++) { if (balls[i].colliding(balls[j])) { balls[i].resolveCollision(balls[j]); } } } This will check for collisions between every ball but skip redundant checks (if you have to check if ball 1 collides with ball 2 then you don't need to check if ball 2 collides with ball 1. Also, it skips checking for collisions with itself). Then, in my ball class I have my colliding() and resolveCollision() methods: public boolean colliding(Ball ball) { float xd = position.getX() - ball.position.getX(); float yd = position.getY() - ball.position.getY(); float sumRadius = getRadius() + ball.getRadius(); float sqrRadius = sumRadius * sumRadius; float distSqr = (xd * xd) + (yd * yd); if (distSqr <= sqrRadius) { return true; } return false; } public void resolveCollision(Ball ball) { // get the mtd Vector2d delta = (position.subtract(ball.position)); float d = delta.getLength(); // minimum translation distance to push balls apart after intersecting Vector2d mtd = delta.multiply(((getRadius() + ball.getRadius())-d)/d); // resolve intersection -- // inverse mass quantities float im1 = 1 / getMass(); float im2 = 1 / ball.getMass(); // push-pull them apart based off their mass position = position.add(mtd.multiply(im1 / (im1 + im2))); ball.position = ball.position.subtract(mtd.multiply(im2 / (im1 + im2))); // impact speed Vector2d v = (this.velocity.subtract(ball.velocity)); float vn = v.dot(mtd.normalize()); // sphere intersecting but moving away from each other already if (vn > 0.0f) return; // collision impulse float i = (-(1.0f + Constants.restitution) * vn) / (im1 + im2); Vector2d impulse = mtd.multiply(i); // change in momentum this.velocity = this.velocity.add(impulse.multiply(im1)); ball.velocity = ball.velocity.subtract(impulse.multiply(im2)); } Source Code: Complete source for ball to ball collider. Binary: Compiled binary in case you just want to try bouncing some balls around. If anyone has some suggestions for how to improve this basic physics simulator let me know! One thing I have yet to add is angular momentum so the balls will roll more realistically. Any other suggestions? Leave a comment!

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  • CPU Usage at 100% with "Hardware Interrupts"

    - by eventualEntropy
    After turning on my desktop one day, I found that my CPU usage was maxed out at 100%, with 99% of that going to hardware "Interrupts". I tried to enable/disable all my devices one by one through the device manager, and found that I could get the CPU usage used by the Interrupts down to 50% by disabling all devices labelled "USB Host Controller" (except the ones for the mouse/keyboard). I found that I also got 10-20% more from disabling "High Definition Audio Controller". Following the tutorial at: http://www.msfn.org/board/topic/140263-how-to-get-the-cause-of-high-cpu-usage-by-dpc-interrupt/ Led me to similar conclusions (that is, that the culprit is mostly "USB Host Controller"): I've tried updating my asus motherboard driver and my video card driver. This is on Windows 7 64 bit. I've spent hours trying to figure this out and I'm running out of ideas short of formatting (which might still not fix it!).

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  • Virtual server hardware to simulate 3-4 node web farm

    - by frankadelic
    I would like to get a dedicated server to run VMWare, VirtualBox, or similar. On this box, I would like to host 3-4 virtual instances of Linux, to act as nodes in a web farm. Performance is not that important, this would only be for testing and experimenting. I need something sub $1000 (including tax/shipping). Can someone recommend a pre-built server that would do the trick? I am pretty ignorant of hardware so building one is not going to work for me. Also, would I need multiple network cards to simulate a web farm or can the virtualization software handle that for me. Thanks

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  • How to Diagnose a Pre-Operating System Load or Hardware Issue

    - by soandos
    How can I find out if my problem is hardware based? If it is, how can I figure out what component is to blame How can I fix other pre-operating system issues? As an aside, what are all of these components responsible for, and if they break, what can go wrong? (This question comes up frequently, and the suggested solutions are usually the same. This community wiki is an attempt to serve as the definitive, most comprehensive answer possible. Feel free to add your contributions via edits.)

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  • Hardware asset management systems

    - by Dave
    I need to track a bunch of specialized testing tools, They are hardware devices used for testing other equipement. Each device has a serial number and is sent out for use in testing. Occasionally they break and have to be sent to the manufacture for repair. I'm looking for an open source application (preferably a webapp) to help manage them. Right now we're using Excel and it's not scaling as we get more tools. They aren't computers so all the standard IT asset management systems don't really fit the bill. I found h-harmony, but that project seems dead?

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  • VirtualBox won't use any kind of hardware acceleration

    - by burnersk
    I see an problem with VirtualBox hardware acceleration functionality... My system configuration: MSI PH67A-C43 (B3) (BIOS: 2.70) Intel Core i5-2400 Windows 7 Professional SP1 64-bit Oracle VirtualBox 4.1.10 Oracle VirtualBox Extension Pack 4.1.10 I can select the individual acceleration options such as PAE/NX, VT-x/VMD-V or Nested Paging within VM-Settings but if I start the VM the accelerations will be disabled as of the tooltip from CPU (right next to shared folders). Each acceleration is "Disabled". Does this sounds familar to anybody? How can I solve this?

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  • Rules to choose hardware for OLTP systems (sql server)

    - by Roman Pokrovskij
    Ok. We know database size, number of concurrent users, number of transactions per minute; should choose number of processors, RAID, RAM, mirroring and clustering. There are no exact rule.. but may be there are no rules at all? In my practice in every case I have "legacy" system, and after some inspections and interview I can form an opinion how hardware and design can be improved. But every time when I meet "absolutely" new system (I guess there are no new systems, but sometimes are such tasks) I can't say anything trustful. So I'm interesting how people deal with such tasks? They map task on theirs experience or have some base formulas?

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  • Server 2008 R2 Datacenter (and all other version) not detecting hardware

    - by Mitchell Skurnik
    I upgraded my ASUS KFN32-D SLI/SAS motherboard to the latest BIOS version and swapped out the 2 dual-core procs with 2 quad core procs. After installing Server 2008 Datacenter onto the system I noticed that it was not connected to the network. I open device manager and see no network adapters. I have to go up to View - Show hidden devices to even see the virtual WAN Miniport adapters. This problem happens in Vista and Windows 7 (all x64). What is even stranger is it all works in x86 mode. What in x64 could be causing windows to not even detect hardware that works in x86? Is the boot manager possibly the culprit?

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  • Windows 2008 Server on VMWare (hardware)

    - by Bill
    I want to setup a single server to run a few virtual servers for our datacenter. I do not have a lot of money to spend so I am trying to gain bang for the buck. My budget is around $2,000. So I was thinking about building the following as the VMWare physical server: Intel iCore 7 950 (LGA1366, 4 cores,8 threads) Gigabyte GA-X58-USB3 LGA 1366 X58 ATX Intel Motherboard 24 GB of Viper II Series, Sector 7 Edition, Extreme Performance DDR3-1600 (PC3-12800) CL9 Triple Channel Memory VelociRaptor 300GB 10,000 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive I am planning on running the newest version of VMWare ESXi (64-bit). On these I am planning on running a few various servers: Windows 2008 Server R2 w/ IIS (several custom built ASP.NET Apps) Windows 2008 Server R2 w/ MS SQL 2008 Database Server Linux Web Server w/ Several WordPress Blogs (XAMPP?) Windows 2008 Server R2 w/ IIS (DEV ENVIRONMENT) Windows 2008 Server R2 w/ MS SQL 2008 Database Server (DEV ENVIRONMENT) In your opinion, will this hardware be sufficient to run the above load with room for possible 2-3 more virtual machines (probably lightweight web servers)?

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  • Hardware specs for web cache

    - by Raj
    I am looking for recommendations for hardware specs for a server that needs to be a web cache for a user population of about 2,000 concurrent connections. The clients are viewing segmented HTTP video in bitrates ranging from 150kbps to 2mbps. Most video is "live" meaning segments of 2-10 secs each, of which 100 or so are maintained at a time. There are also some pre-recorded fixed length videos. How would I go about doing the provisioning calculation for such a server: What kind of HDD (SSD?), how many NICs how much RAM etc? I am thinking of using Varnish on Linux, all the RAM I can get my hands on, 2 CPUs with 6-8 cores each.

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  • Does programmable hardware exist to allow hardware to be programmed by computers?

    - by agentbanks217
    I am a programmer and I have never really dealt with the hardware of anything, only software. I want to start building things that I can control from my computer using programming. My question is are there such devices on the market that have a programmable interface or API? For example, I want to build a automated window blinds opening/closing device, and I would like to be able to control it from my computer e.g. writing an app or some code to schedule them when to open and close. I would like to know if there are any devices that can be programmed to do that (the computer part)? Thanks!

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  • Rails Browser Detection Methods

    - by alvincrespo
    Hey Everyone, I was wondering what methods are standard within the industry to do browser detection in Rails? Is there a gem, library or sample code somewhere that can help determine the browser and apply a class or id to the body element of the (X)HTML? Thanks, I'm just wondering what everyone uses and whether there is accepted method of doing this? I know that we can get the user.agent and parse that string, but I'm not sure if that is that is an acceptable way to do browser detection. Also, I'm not trying to debate feature detection here, I've read multiple answers for that on StackOverflow, all I'm asking for is what you guys have done. [UPDATE] So thanks to faunzy on GitHub, I've sort of understand a bit about checking the user agent in Rails, but still not sure if this is the best way to go about it in Rails 3. But here is what I've gotten so far: def users_browser user_agent = request.env['HTTP_USER_AGENT'].downcase @users_browser ||= begin if user_agent.index('msie') && !user_agent.index('opera') && !user_agent.index('webtv') 'ie'+user_agent[user_agent.index('msie')+5].chr elsif user_agent.index('gecko/') 'gecko' elsif user_agent.index('opera') 'opera' elsif user_agent.index('konqueror') 'konqueror' elsif user_agent.index('ipod') 'ipod' elsif user_agent.index('ipad') 'ipad' elsif user_agent.index('iphone') 'iphone' elsif user_agent.index('chrome/') 'chrome' elsif user_agent.index('applewebkit/') 'safari' elsif user_agent.index('googlebot/') 'googlebot' elsif user_agent.index('msnbot') 'msnbot' elsif user_agent.index('yahoo! slurp') 'yahoobot' #Everything thinks it's mozilla, so this goes last elsif user_agent.index('mozilla/') 'gecko' else 'unknown' end end return @users_browser end

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