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  • What can go wrong with a GLIBC upgrade?

    - by Sevenless
    I recently installed a piece of software that my group needs for a research project starting next September. Turns out the software has a known crash bug when used with glibc 2.12.1. My boss asked if we can upgrade glibc on the server that's supposed to run it. Cue my skeptical silence.... At some point, I got it into my brain that messing with glibc was about as good an idea as messing with a hungry puma; however, I've been unable to determine the source of this belief. So, if I go ahead with this: Am I doing something flagrantly stupid (e.g. I won't fix my problem, I will brick my server, or I will initiate a zombie apocalypse)? What can go wrong? What is likely to go wrong? How do I avoid the answers to 2 and 3?

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  • Use Your Web Browser As A Calculator

    - by Gopinath
    Quite often most of us require Calculator application to evaluate percentage calculations, divisions,etc. Whenever I needed a calculator application I launch Windows Calculator application as it’s built into each and every version of Windows I use.  But the moment I learn that almost all the web browsers have a built in calculator, I stopped using Windows Calculator.  Google Search Box – Every Browser’s Built In Calculator Google Search Box is the built in calculator of every web browser. The search box is capable of evaluation simple expressions like 20/50+10 as well as complex arithmetic formulas that include functions like sin, cos, tan,etc. Almost every web browser has Google Search box by default, if not you can install it very quickly. In Google Chrome browser, Google Search box is built in right inside the address bar. In Firefox & Internet Explorer you can locate it on the top right corner.    To perform calculations, why to launch Calculator when we have a web browser open on our desktop most of the time? Join us on Facebook to read all our stories right inside your Facebook news feed.

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  • What's the relationship between meta-circular interpreters, virtual machines and increased performance?

    - by Gomi
    I've read about meta-circular interpreters on the web (including SICP) and I've looked into the code of some implementations (such as PyPy and Narcissus). I've read quite a bit about two languages which made great use of metacircular evaluation, Lisp and Smalltalk. As far as I understood Lisp was the first self-hosting compiler and Smalltalk had the first "true" JIT implementation. One thing I've not fully understood is how can those interpreters/compilers achieve so good performance or, in other words, why is PyPy faster than CPython? Is it because of reflection? And also, my Smalltalk research led me to believe that there's a relationship between JIT, virtual machines and reflection. Virtual Machines such as the JVM and CLR allow a great deal of type introspection and I believe they make great use it in Just-in-Time (and AOT, I suppose?) compilation. But as far as I know, Virtual Machines are kind of like CPUs, in that they have a basic instruction set. Are Virtual Machines efficient because they include type and reference information, which would allow language-agnostic reflection? I ask this because many both interpreted and compiled languages are now using bytecode as a target (LLVM, Parrot, YARV, CPython) and traditional VMs like JVM and CLR have gained incredible boosts in performance. I've been told that it's about JIT, but as far as I know JIT is nothing new since Smalltalk and Sun's own Self have been doing it before Java. I don't remember VMs performing particularly well in the past, there weren't many non-academic ones outside of JVM and .NET and their performance was definitely not as good as it is now (I wish I could source this claim but I speak from personal experience). Then all of a sudden, in the late 2000s something changed and a lot of VMs started to pop up even for established languages, and with very good performance. Was something discovered about the JIT implementation that allowed pretty much every modern VM to skyrocket in performance? A paper or a book maybe?

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  • Is there a path from OpenSCAD to WebGL?

    - by Andrew Domaszek
    tl;dr version, Does a software path exist to convert from openscad input to render on a website via webgl? What I'm trying to do is display OpenSCAD created designs uploaded via post on a LEMPy driven website; this is currently done by outputting to a static png image. I would like to render one of openscad's export formats(wikibooks) and convert for display in javascript/webgl through some software path available via linux batch. CPU and RAM are relatively unconstrained but no GPU available. I've looked into CopperLeicht, but it requires CopperCube output which would require windows or wine. FOSS is preferred but not required. edit: I found three.js has converters for fbx, dae, obj, and 3ds formats which might be helpful as one of the last steps.

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  • OpenGL Tessellation makes point

    - by urza57
    A little problem with my tessellation shader. I try to implement a simple tessellation shader but it only makes points. Here's my vertex shader : out vec4 ecPosition; out vec3 ecNormal; void main( void ) { vec4 position = gl_Vertex; gl_Position = gl_ModelViewProjectionMatrix * position; ecPosition = gl_ModelViewMatrix * position; ecNormal = normalize(gl_NormalMatrix * gl_Normal); } My tessellation control shader : layout(vertices = 3) out; out vec4 ecPosition3[]; in vec3 ecNormal[]; in vec4 ecPosition[]; out vec3 myNormal[]; void main() { gl_out[gl_InvocationID].gl_Position = gl_in[gl_InvocationID].gl_Position; myNormal[gl_InvocationID] = ecNormal[gl_InvocationID]; ecPosition3[gl_InvocationID] = ecPosition[gl_InvocationID]; gl_TessLevelOuter[0] = float(4.0); gl_TessLevelOuter[1] = float(4.0); gl_TessLevelOuter[2] = float(4.0); gl_TessLevelInner[0] = float(4.0); } And my Tessellation Evaluation shader: layout(triangles, equal_spacing, ccw) in; in vec3 myNormal[]; in vec4 ecPosition3[]; out vec3 ecNormal; out vec4 ecPosition; void main() { float u = gl_TessCoord.x; float v = gl_TessCoord.y; float w = gl_TessCoord.z; vec3 position = vec4(gl_in[0].gl_Position.xyz * u + gl_in[1].gl_Position.xyz * v + gl_in[2].gl_Position.xyz * w ); vec3 position2 = vec4(ecPosition3[0].xyz * u + ecPosition3[1].xyz * v + ecPosition3[2].xyz * w ); vec3 normal = myNormal[0] * u + myNormal[1] * v + myNormal[2] * w ); ecNormal = normal; gl_Position = vec4(position, 1.0); ecPosition = vec4(position2, 1.0); } Thank you !

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  • Star Trek inspired home automation visualisation

    - by Zak McKracken
    I’ve always been a more or less active fan of Star Trek. During the construction phase of my house I started coding a GUI for controlling the house which has an EIB. Just for fun I designed a version inspired by the LCARS design used in Star Trek TNG and showed this to my wife. I showed her several designs before but this was the only one, she really liked. So I decided to go on with this. I started a C# WinForms application. The software runs on a wall mounted Shuttle Barebone-PC. First plan was an industrial panel-pc but the processor was too slow. The now-used Atom is ok. I started with the LCARS-controls found on Codeproject. Since the classic LCARS design divides the screen into two parts this tended to be impracticable, so I used my own design For now the software is able to: Switch lights/wall outlets Show current temperatures for all room controllers Show outside temperature with a 24h trend chart Show the status of the two heat pumps Provide an alarm clock (e.g. for cooking) Play internet radio streams Control absence Mute the door bell Speak status messages via speech synthesis For now, I’m working on an integration of my electric meter. The main heat pump and the electric meter are connected to my LAN. I also tried some speech recognition, but I’ve problems with the microphone. I't’s working when you are right in front of the PC, but not far away, let’s say on the other side of the room. So this is the main view. The table displays raw values which are sent over the EIB – completely useless but looks great For each floor I have a different view. Here you can see the temperatures and check the status of the lights (the buttons are blinking when a light is switched on) This is the view for the heat pump:   Next step would be to integrate a control of my squeezebox server (I use different Squeezeboxes through the house as a multiroom audio solution)

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  • What program is making this sound and how can I make it stop

    - by DrFredEdison
    Some program is intermittently making this weird "chook ... chick" sound, no more than every 5 minutes, but sometimes hours or days between making it. There seems to be no pattern as to when it happens, but the sound is definitely coming from the speakers, and is always the same, so I'm pretty confident some piece of software I'm running is playing the sound. Today, I managed to record it, and I've posted it here: http://tristanhavelick.com/chook-chick.mp3 Short of closing my programs one by one, and seeing if the sound continues, are there any tricks for tracking down a problem like this? Is there any software that can trace what sounds come from what programs (something like tcpview with waveforms)? I am running windows xp.

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  • Nokia Pc Suite problems with bluetooth (win7)

    - by wurlog
    I have a new Nokia C5-00 and a HP 620. The Bluetoothdriver are installed and the windows Bluetoothstack finds the mobile. After installing Nokia PC Suite I am asked to choose a connection method. As I click on Bluetooth the Nokia PC Suite shows an error message: "Cannot use the connection type.Check that all the needd hardware,software and drivers are available. (Code: OpenMedia)" I tried to switch it on and off via the "wireless" key on the laptop. The HP Software for the button shows that the Bluetooth is deactivated and advices me to go to the device manager and activate the Bluetooth device. Strangely the Bluetooth symbol (I guess from the windows Bluetoothstack) pops up at the same time and I can use the Bluetooth in it's basic windows features, but still nokia suite won't work. ideas????

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  • How do you cope with change in open source frameworks that you use for your projects?

    - by Amy
    It may be a personal quirk of mine, but I like keeping code in living projects up to date - including the libraries/frameworks that they use. Part of it is that I believe a web app is more secure if it is fully patched and up to date. Part of it is just a touch of obsessive compulsiveness on my part. Over the past seven months, we have done a major rewrite of our software. We dropped the Xaraya framework, which was slow and essentially dead as a product, and converted to Cake PHP. (We chose Cake because it gave us the chance to do a very rapid rewrite of our software, and enough of a performance boost over Xaraya to make it worth our while.) We implemented unit testing with SimpleTest, and followed all the file and database naming conventions, etc. Cake is now being updated to 2.0. And, there doesn't seem to be a viable migration path for an upgrade. The naming conventions for files have radically changed, and they dropped SimpleTest in favor of PHPUnit. This is pretty much going to force us to stay on the 1.3 branch because, unless there is some sort of conversion tool, it's not going to be possible to update Cake and then gradually improve our legacy code to reap the benefits of the new Cake framework. So, as usual, we are going to end up with an old framework in our Subversion repository and just patch it ourselves as needed. And this is what gets me every time. So many open source products don't make it easy enough to keep projects based on them up to date. When the devs start playing with a new shiny toy, a few critical patches will be done to older branches, but most of their focus is going to be on the new code base. How do you deal with radical changes in the open source projects that you use? And, if you are developing an open source product, do you keep upgrade paths in mind when you develop new versions?

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  • Should Professional Development occur on company time?

    - by jshu
    As a first-time part-time software developer at a small consulting company, I'm struggling to organise time to further my own software development knowledge - whether that's reading a book, keeping up with the popular questions on StackOverflow, researching a technology we're using in-depth, or following the front page of Hacker News. I can see results borne from my self-allocated study time, but listing and demonstrating the skills and knowledge gained through Professional Development is difficult. The company does not have any defined PD policy, and there's a lot of pressure to get something deliverable done now! when working for consultants. I've checked what my coworkers do, and they don't appear to allocate any time to self-improvement; they just work at the problems they're given, looking up specific MSDN references, code samples, and the like as they need them. I realise that PD policy is going to vary across companies of different size and culture, and a company like my own is probably a bit of an edge case. I'd love to hear views and experiences from more seasoned developers; especially those who have to make the PD policy choices in their team or company. I'd also like to learn about the more radical approaches to PD, even if they're completely out there; it's always interesting to see what other people are trying. Not quite a summary, but what I'm trying to ask: Is it common or recommended for companies to allocate PD time? Whose responsibility is it to ensure a developer's knowledge and skills are up to date? Should a part-time work schedule inspire a lower ratio of PD time : work? How can a developer show non-developer coworkers that reading blogs and books is net productive? Is reading blogs and books actually net productive? (references welcomed) Is writing blogs effective as a way of PD? (a recent theme on Hacker News) This is sort of a broad question because I don't know exactly which questions I need to ask here, so any thoughts on relevant issues I haven't addressed are very welcome.

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  • Presenting the Cloud in a Different Way

    - by BuckWoody
    I had the honor of presenting the Developers at the Portland PASS chapter, and decided to go a different way than just using PowerPoint Slides…. (click on any picture to enlarge) The point is that when you need to get a point across, it’s OK to change tactics to make sure the information sticks. In this case, I decided to make the audience the PowerPoint. I used a few props to show the various paradigms we use to describe what the industry uses for the word “cloud” First, we talked about Infrastructure as a Service. I picked a gentleman who didn’t quite fit the hard hat and safety vest I picked out for him. Notice our “user” as she accesses our “Server” (complete with tray and glass) which has been virtualized.    Software as a service comes next. In this case, the user and potentially even customers just access software (represented here as a Windows ME box…) remotely – everything is virtualized. Finally, Platform as a Service – Yup, Platform shoes as a necklace, and a tie-dye shirt to represent the 70’s – a decade when mainframes used stateless programming as well. Notice also the components of Windows Azure – Compute (Keyboard) Application Fabric (Toy Bus) and Storage (Bucket).   And at the end of the day, it’s all about serving those customers…

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  • How do I account for changed or forgotten tasks in an estimate?

    - by Andrew
    To handle task-level estimates and time reporting, I have been using (roughly) the technique that Steve McConnell describes in Chapter 10 of Software Estimation. Specifically, when the time comes for me to create task-level estimates (right before coding begins on a project), I determine the tasks at a fairly granular level so that, whenever possible, I have no tasks with a single-point, 50%-confidence estimate greater than four hours. That way, the task estimation process helps with constructing the software while helping me not to forget tasks during estimation. I come up with a range of hours possible for each task also, and using the statistical calculations that McConnell describes along with my historical accuracy data, I can generate estimates at other confidence levels when desired. I feel like this method has been working fairly well for me. We are required to put tasks and their estimates into TFS for tracking, so I use the estimates at the percentage of confidence I am told to use. I am unsure, however, what to do when I do forget a task, or I end up needing to do work that does not neatly fall within one of the tasks I estimated. Of course, trying to avoid this situation is best, but how do I account for forgotten/changed tasks? I want to have the best historical data I can to help me with future estimates, but right now, I basically am just calculating whether I made the 50%-confidence estimate and whether I made it inside the ranged estimate. I'll be happy to clarify what I'm asking if needed -- let me know what is unclear.

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  • Are there videocamera which geotag individual frames?

    - by Grzegorz Adam Hankiewicz
    I'm looking for a way to record live video with the specific requirement of having each frame georeferenced with GPS. Right now I'm using a normal video camera with a PDA+GPS that records the position, but it's difficult to sync both of these plus sometimes I've forgotten to turn the PDA+GPS or it has failed for some reason and all my video has been useless. Using google I found that about two years ago a company named Seero produced such video cameras and software, but apparently the domain doesn't exist any more and I only find references of other pages mentioning it. Does somebody know of any other product? I need to record this video in HD and have some way to export to Google Maps or other GIS software the positions of the frames in a way that I can click on the map and see what was being recorded in the video at that point. The precission of the GPS tracking is good enough as one position per second, intermediate frames of the video stream can be interpolated.

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  • How to restore curropted installation?

    - by nightweels
    I have a laptop with dead battery that when there is no current connected to it turns critical so fast and in the energy management in ubuntu, when the battery is critical, there are 2 options: shutdown and hibernate witch is in grey (unclickable), so I have no choice but to chose immediate shutdown, there is no standby even if it is an option in the screen behavior. An immediate shutdown (and I mean by immediate the one that we use when we ended using the computer) happened while I was installing a program called quickly, so after the power was restored, I tried to reinstall the program then I get this translated message: An untreatable error occurred: It seems there is a software error in aptdaemon, the program that lets you install and remove software and any other task related to package management. details: Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/aptdaemon/worker.py", line 968, in simulate trans.unauthenticated = self._simulate_helper(trans) File "/usr/lib/python2.7/dist-packages/aptdaemon/worker.py", line 1092, in _simulate_helper return depends, self._cache.required_download, \ File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 235, in required_download pm.get_archives(fetcher, self._list, self._records) SystemError: E:I wasn't able to locate a file for the libpng12-dev package. This might mean you need to manually fix this package.

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  • sudoer scheme for a web developer that retains future control of a server?

    - by Tchalvak
    Background I have a server that I'm looking to set up, and provide access to another web developer. I don't want to put many constraints on him, though I wouldn't mind isolating the site that he'll be developing from others on the server that I will develop. The problem Mainly what I want is to make sure that I retain control over the server in the future. I want to reserve the ability to create/promote/demote and other administrative functions that don't deal with web software. If I make him an admin, he can sudo su - and become root and remove root control from me, for example. What is a good setup for the sudoers file so that he can do things like: *install software (through apt-get) restart apache access mysql configure mysql/apache reboot edit web development configuration type files in /etc * And can't do things like: take away other admin permissions change the root password have control over other security/administrative functions Example sudoer files that accomplish something like that could be useful, I'm sure that people have needed to do this before.

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  • Is 'Protection' an acceptable Java class name

    - by jonny
    This comes from a closed thread at stack overflow, where there are already some useful answers, though a commenter suggested I post here. I hope this is ok! I'm trying my best to write good readable, code, but often have doubts in my work! I'm creating some code to check the status of some protected software, and have created a class which has methods to check whether the software in use is licensed (there is a separate Licensing class). I've named the class 'Protection', which is currently accessed, via the creation of an appProtect object. The methods in the class allow to check a number of things about the application, in order to confirm that it is in fact licensed for use. Is 'Protection' an acceptable name for such a class? I read somewhere that if you have to think to long in names of methods, classes, objects etc, then perhaps you may not be coding in an Object Oriented way. I've spent a lot of time thinking about this before making this post, which has lead me to doubt the suitability of the name! In creating (and proof reading) this post, I'm starting to seriously doubt my work so far. I'm also thinking I should probably rename the object to applicationProtection rather than appProtect (though am open to any comments on this too?). I'm posting non the less, in the hope that I'll learn something from others views/opinions, even if they're simply confirming I've "done it wrong"!

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  • Recommended total system backup solution

    - by bioShark
    I hope this question won't get closed immediately since it has a generic title. I already searched a bit around the answers here, but nothing satisfied me. I want a back-up solution that makes a total back-up, so that I can restore my Ubuntu in case of major failures, like HDD failing. As far as I can see, I have 2 choices: 1) Backing up with Deja Dup to an external disk. This is fine and I am already doing, but in case my HDD fails, and I make a new Ubuntu install on a new disk, will Deja Dup be able to restore all my setting and stuff from the backed up files? If it can, then what other files/folders should I add in Deja Dup to back-up (currently I have set only the recommended /home folder)? Is there a point in telling Deja Dup to back-up everything under "/" ? 2) A disk/partition cloning software. This would be something similar to Noton ghost. Is there such a software with nice GUI that you could recommend for Ubuntu? And even better, it would be nice if Ubuntu's liveCD could recognize such a clone at install step. I am using 11.10

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  • Firewall to block traffic to specific websites

    - by Ctroy
    I have recently switched from MAC to Windows Vista. I used to have LittleSnitch on Mac where I can create filters and disable browsing to other websites. I mean, I can create filters so that LittleSnitch will not send traffic to specific websites like Google Analytics etc. However, I cannot find a similar software on Windows. I tried Zone Alarm firewall, but it doesn't let you add filters to stop traffic to specific websites. Are there any software available on windows which are similar to LittleSnitch?

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  • Convert Pdf to exe to raise security

    - by kamiar3001
    hi folks I have some pdfs I want convert all to exe files and put them into folder on my cd and my customers run exe files instead of pdf and for security reason. so I have tried pdf2exe tools but I need something totally free. pdf2exe is evaluation version and there are some limitation. Please tell me something free, I don't need complicated one I just need encapsulating into exe file. In fact I don't want someone be able to save pdf document and I want to have Independent viewer on my cd.

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  • Magento 1.6.2 Catalog Price Rule Problem

    - by robgt
    My Magento system seems to have a slight issue with Catalog Price Rule application. As far as the customer is concerned, all is working perfectly. The problem is that some orders are not being displayed properly in the admin system when I look at the details. The Catalog Price rule appears to not be applied - so when we reconcile our card processor details with those in our backend Sage system, numbers are not tallying up. Magento and out Sage system say the customer paid X, but the card issuer has taken payment of Y. The payment amount is correct due to the Catalog Price Rule. The customer is always paying the correct amount, but because of some issue with Magento, I think the data is possibly not being stored correctly (stored without the catalog price rule discount amount applied). This means that when I look at an order in the admin system, the line item prices that should be affected by the catalog price rule are not - but also the prices in our backend Sage system are incorrect too. We use another piece of software to bring the data into Sage from Magento, so the data must be stored in Magento's database incorrectly somewhere as this software reads out the order information from Magento. Does anyone have any idea what is wrong here, and how it might be fixed? Cheers!

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  • Trying to migrate Windows 7 install of Adobe CS5 to Ubuntu 12.04 with Wine - 'Internal errors - invalid paramters received"

    - by Don
    I have Adobe CS5 installed and running on the Windows 7 side of my machine. Since I'd hate to boot up into Windows just to use Photoshop, I'm trying to get it in Ubuntu 12.04. Tutorials I found suggested that the easiest way to have it in Ubuntu was to install Wine, and copy my Windows installation over. Here are the exact steps I've done up to this point. From Windows, exported the registry key for HKEY_LOCAL_MACHINE SOFTWARE Adobe to the desktop. Changed to Ubuntu, downloaded Wine from Software Center Terminal: $ sudo apt-get install wine ttf-mscorefonts-installer $ winecfg $ wget http://www.kegel.com/wine/winetricks $ sh winetricks msxml6 gdiplus gecko vcrun2005sp1 vcrun2008 msxml3 atmlib Moved registry export to home folder. Copied "Program Files (x86)\Adobe" to "~/.wine/drive_c/Program Files (x86)/Adobe" "Program Files (x86)\Common Files\Adobe" to "~/.wine/drive_c/Program Files (x86)/Common Files/Adobe" "Documents and Settings\Don\Application Data\Adobe" to "~/.wine/drive_c/users/don/Application Data/Adobe" "Windows\System32\odbcint.dll" to "~/.wine/drive_c/windows/system32/odbcint.dll" ,and lastly "Windows\System32\odbc32.dll" to "~/.wine/drive_c/windows/system32/odbc32.dll". From Terminal, $ wine regedit adobe.reg. Right clicked on Photoshop.exe and selected "Open with Wine". Got the message "Wine Program Crash, Internal errors - invalid parameters received." So to restate my question, How can I get Photoshop running in Ubuntu 12.04? I'm not sold on doing it in this specific way, I just want to use Photoshop without having to reboot. What's the best way to make this happen? Edit: I do not have the installation CD, no.

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  • AWS Elastic load balancer doesn't decrease instances from Alarm Trigger

    - by jchysk
    I have a load balancer that I created an auto-scaling-group and launch-config for. I created the auto-scaling-group with a min-size of 1 and max size of 20. I have a scaledown policy: as-put-scaling-policy SBMScaleDownPolicy --auto-scaling-group SBMAutoScaleGroup --adjustment=-1 --type ChangeInCapacity --cooldown 300 Then I set up an alarm: mon-put-metric-alarm SBMLowCPUAlarm --comparison-operator LessThanThreshold --evaluation-periods 1 --metric-name CPUUtilization --namespace "AWS/EC2" --period 600 --statistic Average --threshold 35 --alarm-actions arn:aws:autoscaling:us-east-1:policystuffhere:autoScalingGroupName/SBMAutoScaleGroup:policyName/SBMScaleDownPolicy --dimensions "AutoScalingGroupName=SBMAutoScaleGroup" When average CPU usage over 10 minutes is under 35, in CloudFront the alarm shows up as "In Alarm State" but doesn't decrease the number of instances. Also, if there's only one instance running it'll spin up another to 2 even if a scale up alarm isn't hit. It seems like the default value is just set to 2 somehow. How can I change this?

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  • Streaming media from linux server - low footprint is crucial

    - by Mike Haye
    I recently pre-ordered the Raspberry Pi. http://www.raspberrypi.org/faqs For those of you who don't know it, it's a machine with 256 mb ram and a 700 MHz processor for $35. I plan to run linux on an SD card on this machine and have it act as both a htpc, VPN and media server. In regard to the media server part, I need to find some linux software that has a small footprint, but allows me to stream media to other devices connected to the internet (preferably without having to install any additional software on the client machines) Also, I would love if the video could be compressed, so the data usage wouldn't be so big for the client machine (e.g. when I'm using my data plan on my smartphone ;) ) Thanks in advance for any answers :) Mike.

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