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• Complex behavior generated by simple computation

  - by Yuval A

  Stephen Wolfram gave a fascinating talk at TED about his work with Mathematica and Wolfram Alpha. Amongst other things, he pointed out how very simple computations can yield extremely complex behaviors. (He goes on to discuss his ambition for computing the entire physical universe. Say what you will, you gotta give the guy some credit for his wild ideas...) As an example he showed several cellular automata. What other examples of simple computations do you know of that yield fascinating results?

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• NFS Server in Java

  - by dmeister

  I search an implementation of a network (or distributed) file system like NFS in Java. The goal is to extend it and do some research stuff with it. On the web I found some implementation e.g. DJ NFS, but the open question is how mature and fast they are. Can anyone purpose a good starting point, has anyone experience with such things? P.S. I know Hadoop DFS and I used it for some projects, but Hadoop is not a good fit for the things I want to do here. --EDIT-- Hadoop is really focused on highly scalable, high throughput computing without the possibilities to overwrite parts of a file and so an. The goal is you could use the filesystem e.g. for user home directories. --EDIT-- More Details: The idea is to modify such a implementation so that the files are not stored directly on a local filesystem, but to apply data de-duplication.

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• [java] Efficiency of while(true) ServerSocket Listen

  - by Submerged

  I am wondering if a typical while(true) ServerSocket listen loop takes an entire core to wait and accept a client connection (Even when implementing runnable and using Thread .start()) I am implementing a type of distributed computing cluster and each computer needs every core it has for computation. A Master node needs to communicate with these computers (invoking static methods that modify the algorithm's functioning). The reason I need to use sockets is due to the cross platform / cross language capabilities. In some cases, PHP will be invoking these java static methods. I used a java profiler (YourKit) and I can see my running ServerSocket listen thread and it never sleeps and it's always running. Is there a better approach to do what I want? Or, will the performance hit be negligible? Please, feel free to offer any suggestion if you can think of a better way (I've tried RMI, but it isn't supported cross-language. Thanks everyone

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• excel change 4 rows / 48 col to 48 rows / 4 col

  - by GoodOlPete

  Hi, I've selected 4 database records of 48 fields into excel as below: FirstName LastName Age Address1 ....................... Andy smith 23 53 high st billy ball 43 23 the avenue charles brown 76 rose cottage dave green 43 station rd I want to display them as firstname andy billy charles dave lastname smith ball brown green age 23 43 76 43 address1.............................. Can anyone suggest how to do this?

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• Does disable log error for MySQL increasing it's performance ? How disable it?

  - by adnan

  Does disable log error for MySQL increasing it's performance ? How disable it ? This is my service status Server load 0.63 (8 CPUs) Memory Used 23.38% (957,600 of 4,096,000) Swap Used 0% (0 of 1) And this is print screen for process manager http://elnhrda.com/promgr.jpg This is my.cnf [mysqld] query_cache_size=64M skip-name-resolve #innodb_file_per_table=1 query_cache_limit=2M read_buffer_size = 2M read_rnd_buffer_size = 16M sort_buffer_size = 8M join_buffer_size = 8M thread_cache_size = 8 thread_concurrency = 8 innodb_buffer_pool_size = 2G Iam looking for doing any thing to increase my website speed I have VPS 4G.B RAM CENTOS 6 X86_64 Note please : this statics taken now which no any queries executed & site have not any visitors in the same time

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• How to set username and password for SmtpClient object in .NET?

  - by Ryan

  I see different versions of the constructor, one uses info from web.config, one specifies the host, and one the host and port. But how do I set the username and password to something different from the web.config? We have the issue where our internal smtp is blocked by some high security clients and we want to use their smtp server, is there a way to do this from the code instead of web.config?

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• Wireless connection switches off IP address

  - by Sanjay Gupta

  I have a Lenovo laptop with windows XP and a wireless connection at home. The wireless connection works when initially I switch on the computer. but if I leave it for even 5 minutes, the wireless is gone. Then I have to shut it off and start computer all over again, waiting for 5 minutes. Even if the wireless speed is 48Mbps or better, it gives the message "Renewing IP address" and gets stuck there not moving to the next stage. Other laptop in the household works fine and can be left on. Why does this happen ? I suspect that IP address is the problem and somehow is not registered in all the necessary files.

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• Precompile Lambda Expression Tree conversions as constants?

  - by Nathan

  It is fairly common to take an Expression tree, and convert it to some other form, such as a string representation (for example this question and this question, and I suspect Linq2Sql does something similar). In many cases, perhaps even most cases, the Expression tree conversion will always be the same, i.e. if I have a function public string GenerateSomeSql(Expression<Func<TResult, TProperty>> expression) then any call with the same argument will always return the same result for example: GenerateSomeSql(x => x.Age) //suppose this will always return "select Age from Person" GenerateSomeSql(x => x.Ssn) //suppose this will always return "select Ssn from Person" So, in essence, the function call with a particular argument is really just a constant, except time is wasted at runtime re-computing it continuously. Assuming, for the sake of argument, that the conversion was sufficiently complex to cause a noticeable performance hit, is there any way to pre-compile the function call into an actual constant?

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• Complex gestures on the iPhone.

  - by Tejaswi Yerukalapudi

  Is there a high level library that handles complex gestures l ike detecting triangles / loops / circles? Is it even possible to build such a library with what Apple already has? Thanks, Teja

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• Godaddy vs. Route53 for DNS

  - by tim peterson

  I have my website set up as an EC2 instance and my DNS is currently Godaddy. I'm considering switching to Amazon AWS Route53 for DNS. The one thing I noticed however is that Route53 charges monthly fees but I never get any bills from Godaddy. Obviously, nobody likes getting charged for something they can get for free. If Godaddy is cheaper, can anyone confirm that the page load speed of an EC2 instance is actually better via Route53 vs. Godaddy? If it is not faster or cheaper, can someone point out other reasons it might make sense to do this switch? thanks, tim

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• Formatting a barcode with hyphens in between - Assignment question

  - by capex

  Hi, The assignment at my first year uni computing course says my program should read a barcode number, and then display the same 13 digit barcode number separated by hyphens. For example, 9300675016902 should look like 930-067501-690-1. The restrictions say I can't use the following: No arrays No strings No functions. Any directions on this? (So far I have done this: part1 = barcode/10000000000; which gives me the first three digits, and this: part4 = barcode%10; which gives me the last digit. Thanks in advance!

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• Windows File Sharing - Long Initial Delay

  - by Isaac Sutherland

  I have two Windows 7 machines connected to a router. I created a shared folder on machine A, and I can access it from machine B. The transfer speed is great. However, there is sometimes a long initial delay when I try to access the shared folder from machine B. I'll click to open the folder, and windows explorer pauses for a few minutes before actually loading the contents of the folder. After it loads, however, I can navigate the subfolders and edit files with no noticeable delay. Then, some time later, I will get the huge delay on saving a file, after which subsequent saves have no delay. What is the problem here, and how can I fix it?

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• How to burn a CD-ROM from a Mac for Solaris

  - by cope360

  I would like to burn a CD using a Mac (10.5) which I can then access from a Solaris 10 x86 machine. This partially works: Insert blank CD and let the Finder open it so it creates a "Recordable CD" window for it. Drag the files to be burned into the "Recordable CD" window Burn (there are no options except for speed) Then to mount in Solaris: mount -f hsfs -o ro /dev/dsk/foo /mnt/bar The problem here is that Solaris will see all the filenames as lower case and it will only allow each file name to contain one period (these are HSFS limitations). My guess is that the Mac is not burning the disc with the Rock Ridge extensions that allow for the full file names to be preserved. Is there some combination of burning tools/options and mount options that will make this work?

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• Windows setup claims the installation source is not accessible. How do I fix this?

  - by Wil

  I'm trying to install Windows 7 Ultimate over my existing Windows 7 Professional. I downloaded the ISO from Microsoft and burned the install disc at the slowest speed possible (x3). I booted to the DVD, but at the second screen I am already getting an error! That screen I am choosing between "Upgrade" and "Custom". I am trying to choose "Custom" but then I get the error: Windows installation encountered an unexpected error. Verify that the installation sources are accessible, and restart the installation. Error code: 0xE0000100

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• how to run apache2 or nginx + php on iPhone? [closed]

  - by Rubytastic

  Is there a way to run Apache2 or Nginx with PHP on the iPhone? Im surprised so little info is available on this topic, as it seems quite interesting to host websites on an iPhone. Consider slow 3G connections or no 3G at all, and you want to demonstrate some webapplication you wrote... hosting them on the iphone would be an awsome way to fix the speed issues with the mobile network speeds. For the Ipad there are several addoptions available, nothing much usable on iphone / nginx apache2 search terms anywhere :( I want to host some websites on my iphone for demonstration purposes. So when im "out the office" Ill be able to very fast browse some websites that I host on the Iphone. there is no decent information out there, does anyone have a lead on how to do this? My question is specific to if nginx or apache2 can be run on the iphone, it would be nice if PHP would run on it too

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• Why is cpu power management not working in Server 2012 with Hyper-V?

  - by Roland

  We've been using Server2008R2 with Hyper-V for a couple of years now and chose it at the time because of its ability to make use of Intel SpeedStep and AMD PowerNow! Now with Server 2012 and Hyper-V V3, all power management abilities seem to be gone. The CPUs are always at full speed and our servers need twice the energy as before while idling. (Yes, the CPU P-states are enabled in the BIOS) Is this by design? Is there a workaround to enable cpu power management again? Despite the great new features of Hyper-V 3, this would be a show-stopper for us since we are very concerned about energy consumption.

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• Colour instead of color?

  - by Jookia

  I'm working on a game engine in C++ and I have methods like setColour and things that use british grammar. While I was thinking how C++ compilers mostly use the english language (correct me if I'm wrong) and how most APIs use american grammar, should I go with the flow and continue the unofficial standard in the grammar programmer high council or be a rebel? I'm not sure which.

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• Any success using Apache Thrift on iPhone?

  - by jhs

  Has anybody done or seen a deployment of Apache Thrift in an iPhone app? I am wondering if is a reasonable solution for a high-volume, low(er)-latency network service for iPhones compared to HTTP. One noteworthy thing I found is a bug report about running Thrift on the iPhone, which seems to have been fixed. But that doesn't necessarily indicate that it's a done deal.

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• xml to Python data structure using lxml

  - by Samuel Taylor

  How can I convert xml to Python data structure using lxml? I have searched high and low but can't find anything.

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• Help using Horner's rule and Hash Functions in JAVA?

  - by Matt

  I am trying to use Horner's rule to convert words to integers. I understand how it works and how if the word is long, it may cause an overflow. My ultimate goal is to use the converted integer in a hash function h(x)=x mod tableSize. My book suggests, because of the overflow, you could "apply the mod operator after computing each parenthesized expression in Horner's rule." I don't exactly understand what they mean by this. Say the expression looks like this: ((14*32+15)*32+20)*32+5 Do I take the mod tableSize after each parenthesized expression and add them together? What would it look like with this hash function and this example of Horner's rule?

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• IIS7 FastCGI downloads quit at 4128760 bytes on slow connections

  - by eingko

  I'm using FastCGI via IIS7 to host a PHP application. For whatever reason downloads that are streamed via PHP (i.e. a script that outputs a file/bytes as a response) download perfectly fine on high-speed connections but on anything slower (even on DSL) quits at EXACTLY 4128760 bytes (~3.9MB) - which makes me think it's a configuration issue... We only started having this problem when we switched from Apache to IIS - this also points to a configuration problem, I think. But if it's a configuration issue, why would it only affect slower connections? Does anyone know where (or how) I could possibly change a setting like this? I've tried changing the idleTimeout, executionTimeout, and activityTimeout values in my web.config but this hasn't helped at all. Any help or direction would be greatly appreciated. Thanks in advance.

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• Need details about applications that are running on Windows Azure

  - by veda

  I have an application which requires large amount of data storage (say some PB) and computing resources. Instead of going for clusters, I am planning to propose to use Windows Azure Cloud for this application. I have gone through white papers of Windows Azure and have collected some details about Azure. But I feel that is not substantial. I need to do some case study about applications that are running on the azure and that uses azure storage efficiently. I looked for several research paper in related to performance of the applications in Windows Azure. But as Azure was quite new, I wasn't able to find any. Now, I am looking for some white papers/details regarding application that uses azure storage to substantiate my proposal. I also need to understand the windows azure storage architecture and virtual machine architecture. Do anyone know some research papers or details or blogs or something related to these topics.

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• Any chance to get Core Data using Tokyo Cabinet as the persistent store?

  - by dontWatchMyProfile

  I watched a free high quality video with Aaron Hillegass about Core Data vs Tokyo Cabinet. Besides that this guy is amazingly funny (really, if you want to laugh now, watch it!), he shows off Tokyo Cabinet beeing about 40x faster than Core Data. I wonder if it's worth thinking about how to attach this to Core Data? Does that make any sense? Maybe as a custom atomic store or something like this?

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• Remote Desktop Services In A Virtual VMWare Environment

  - by Christopher W. Szabo

  I have a quick question regarding Microsoft Remote Desktop Services in a virtualized environment using VMWare. This environment will actually be hosted in a large data center with in a cloud that is offered. This particular data center has the ability to establish high speed point to point connections with customers via metro-ethernet who are hosted in the cloud. The result is that customers can actually host their corporate domain in the data center's cloud. Put the merits of such a configuration aside for the time being. Believe me when I say that the cloud is stable and had enough hardware behind it to rival a dedicated cabinet. My question has to do with RDS in a virtual environment, which would amount to virtual desktops hosted on a virtual server. I've read that this works without issue using Hyper-V and VMWare. But before I take the plunge I wanted to get some feedback from the community.

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• Are there any libraries (or using GD2 or Image Magick) to allow the upload and processing of EPS or

  - by Jon Busby

  I need to allow for scaling a user uploaded logo to different sizes for different formats, are there any libraries (included or extra) that allow for the procesing of EPS files or high res artwork for this purpose?

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