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  • Cisco ASA 5505: Force NAT before IPsec?

    - by WuckaChucka
    I'm trying to route public-to-public IPs over an IPSec tunnel. However, the src IP is not "interesting" to the Cisco's IPSec engine because it doesn't appear to be getting translated to the outside IP before being evaluated by the Cisco's IPSec engine. From WEST to EAST, my public-to-public IPSec works fine: I can make a request from 192.168.0.5:any to 200.200.200.200:80 because the Vyatta does the NAT translation before the IPSec tunnel inspects the traffic, so the remote-subnet and local-subnet matches (see below). However from EAST to WEST, I see a deny in my Cisco logging buffer for Deny tcp src inside:192.168.1.5/59195 dst outside:100.100.100.100/80 which leads me to believe that the IPSec engine is not matching the encrypt_acl because the address has not been translated yet. Any ideas? WEST (Vyatta): inside: 192.168.0.0/24 inside host: 192.168.0.5/24 outside: 100.100.100.100 IPSec local-subnet: 100.100.100.100/32 IPSec remote-subnet: 200.200.200.200/32 EAST (Cisco): inside: 192.168.1.0/24 inside host: 192.168.1.5/24 (DNAT'ed on port 80 to outside) outside: 200.200.200.200 IPSec local-subnet: 200.200.200.200/32 IPSec remote-subnet: 100.100.100.100/32

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  • Network Multiplayer in Flash

    - by shadowprotocol
    Flash has come a long way in the last decade, and it's a well-kept secret getting a flash game to connect to a multi-client server for chat and/or basic avatar movement in real time. Why has the industry as a whole not made this a common-knowledge type of thing yet? We keep pushing to the web but I am finding it incredibly difficult gathering learning material on this subject. Sure, I can find multi-client server socket tutorials in various languages (using select statements and/or threads to handle multiple socket connections), but in regards to Flash applications inside of a browser? NOPE! Can everyone please share what they know? :] It's a subject I'd really love to get into but I'm afraid I just honestly don't know enough about how to do it. Thanks!

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  • Hiring a Junior Developer, What should I ask?

    - by Jeremy
    We are currently hiring a junior developer to help me out, as I have more projects than I can currently manage. I have never hired anyone who wasn't a friend or at least an acquaintance. I have a phone interview with the only applicant that actually stood out to me (on paper), but I have never done this before. Our projects are all high scalability, data intensive web applications that process millions of transactions an hour, across multiple servers and clients. To be language/stack specific, we use ASP.Net MVC2, WebForms and C# 4, MSSQL 2008 R2, all running atop Windows Server 2008 R2 What should I ask him? How should I structure the phone call?

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  • Moving screenshots from 1 folder to another instantly

    - by Frank
    I am hosting a gaming site and once in a while the server automatically creates a screenshot in the servers folder. Unfortunatly it is NOT configurable in the server settings where it puts these screenshots, it just allways dumps the PNG file in the server config folder. My folder structure is for example as follows: /home/Game/Server1/ now, what I would like to achieve is that once the server creates a screenshot in 1 of these server folders (I have multiple), the operating system moves the screenshot IMMEDIATLY (which is ALLWAYS a *.png file) to the webserver folder, for example: /var/www/Server1/filename.png So that players can see the screenshot on the website. Anyone any idea on how I can tackle this problem the smartest way? Please note that my ideal situation would be if the PNG file is moved immediatly after creation. Thanks for your help. Frank

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  • Executing Shell Commands - PHP or Python?

    - by chadpeppers
    I know basically two languages: Python and PHP. I am primarily a Drupal developer. I have a great idea in creating a command line program that will help some of the mundane tasks and bring my efficiency up quite a bit. The concept is that of a complete console program, almost like the days when I learned C++ using stdin/out. I want to use this came concept but for this program. I am going to be executing shell commands (mainly drush commands, if you are familiar with drush its drupals way of doing tasks like installing drupal, clearing cache, and other things). I am also wanting to do a database and save/execute through multiple objects and site profiles. My general question is this. Which language would be better suited to handle command line code? Drupal is written in PHP so I am leaned more towards that,but I know python seems to handle console programming a bit easier. Any help would be great!

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  • Architecting multi-model multi-DB ASP.NET MVC solution

    - by A. Murray
    I have an ASP.NET MVC 4 solution that I'm putting together, leveraging IoC and the repository pattern using Entity Framework 5. I have a new requirement to be able to pull data from a second database (from another internal application) which I don't have control over. There is no API available unfortunately for the second application and the general pattern at my place of work is to go direct to the database. I want to maintain a consistent approach to modeling the domain and use entity framework to pull the data out, so thus far I have used Entity Framework's database first approach to generate a domain model and database context over the top of this. However, I've become a little stuck on how to include the second domain model in the application. I have a generic repository which I've now moved out to a common DataAccess project, but short of creating two distinct wrappers for the generic repository (so each can identify with a specific database context), I'm struggling to see how I can elegantly include multiple models?

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  • combining ruby and C++

    - by Shingetsu
    Hello /* programmers */ (I usually hang in SO) I've been discussing a conceptual project with a friend of mine and the the most effective way we've seen of doing it is writing the engine in C++ while the logic would be done in Ruby. However, we would need data to be passed around often, for example: Engine reports that A happened, that gets triggered in a proc array (event "A" is passed but proc doesnt use it) Ruby decides that we need to wait for B to happen Ruby adds a proc to an array. The array of procs is iterated during each cycle in the C++ engine C++ engine reports that B happened and passes "event B (should be a ruby object) Ruby receives event B and decides what to do next I don't work with multiple languages often, and was wondering if it's possible to implement things in this way. I know that there's the ruby VALUE in C++, but would like to know the standard way of combining the two. (of course I know ruby follows the perl "more than 1 way to do it", but there's often a standardized way)

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  • PARTNER WEBCAST : Nimble SmartStack for Oracle with Cisco UCS (Nov 12)

    - by Zeynep Koch
    You are invited to the live webcast with Nimble Storage, Oracle and Cisco where we will talk about the new SmartStack solution from Nimble Storage that features Oracle Linux, Oracle VM and Cisco UCS products. When : Tuesday, November 12, 2013, 11:00 AM Pacific Time Panelists: Michele Resta, Director of Linux and Virtualization Alliances, Oracle John McAbel, Senior Product Manager, Cisco Ibby Rahmani, Solutions Marketing, Nimble Storage SmartStack™solutions provide pre-validated reference architectures that speed deployments and minimize risk. All SmartStack solutions incorporate Cisco UCS as the compute and network infrastructure. In this webinar, you will learn how Nimble Storage SmartStack with Oracle and Cisco provides a converged infrastructure for Oracle Database environments with Oracle Linux and Oracle VM. SmartStack, built on best-of-breed components, delivers the performance and reliability needed for deploying Oracle on a single symmetric multiprocessing (SMP) server or Oracle Real Application Clusters (RAC) on multiple nodes.  Register today 

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  • SQL SERVER – Weekly Series – Memory Lane – #053 – Final Post in Series

    - by Pinal Dave
    It has been a fantastic journey to write memory lane series for an entire year. This series gave me the opportunity to go back and see what I have contributed to this blog throughout the last 7 years. This was indeed fantastic series as this provided me the opportunity to witness how technology has grown throughout the year and how I have progressed in my career while writing this blog post. This series was indeed fantastic experience readers as many joined during the last few years and were not sure what they have missed in recent years. Let us continue with the final episode of the Memory Lane Series. Here is the list of selected articles of SQLAuthority.com across all these years. Instead of just listing all the articles I have selected a few of my most favorite articles and have listed them here with additional notes below it. Let me know which one of the following is your favorite article from memory lane. 2007 Get Current User – Get Logged In User Here is the straight script which list logged in SQL Server users. Disable All Triggers on a Database – Disable All Triggers on All Servers Question : How to disable all the triggers for a database? Additionally, how to disable all the triggers for all servers? For answer execute the script in the blog post. Importance of Master Database for SQL Server Startup I have received following questions many times. I will list all the questions here and answer them together. What is the purpose of Master database? Should our backup Master database? Which database is must have database for SQL Server for startup? Which are the default system database created when SQL Server 2005 is installed for the first time? What happens if Master database is corrupted? Answers to all of the questions are very much related. 2008 DECLARE Multiple Variables in One Statement SQL Server is a great product and it has many features which are very unique to SQL Server. Regarding feature of SQL Server where multiple variable can be declared in one statement, it is absolutely possible to do. 2009 How to Enable Index – How to Disable Index – Incorrect syntax near ‘ENABLE’ Many times I have seen that the index is disabled when there is a large update operation on the table. Bulk insert of very large file updates in any table using SSIS is usually preceded by disabling the index and followed by enabling the index. I have seen many developers running the following query to disable the index. 2010 List of all the Views from Database Many emails I received suggesting that they have hundreds of the view and now have no clue what is going on and how many of them have indexes and how many does not have an index. Some even asked me if there is any way they can get a list of the views with the property of Index along with it. Here is the quick script which does exactly the same. You can also include many other columns from the same view. Minimum Maximum Memory – Server Memory Options I was recently reading about SQL Server Memory Options over here. While reading this one line really caught my attention is minimum value allowed for maximum memory options. The default setting for min server memory is 0, and the default setting for max server memory is 2147483647. The minimum amount of memory you can specify for max server memory is 16 megabytes (MB). 2011 Fundamentals of Columnstore Index There are two kinds of storage in a database. Row Store and Column Store. Row store does exactly as the name suggests – stores rows of data on a page – and column store stores all the data in a column on the same page. These columns are much easier to search – instead of a query searching all the data in an entire row whether the data are relevant or not, column store queries need only to search a much lesser number of the columns. How to Ignore Columnstore Index Usage in Query In summary the question in simple words “How can we ignore using the column store index in selective queries?” Very interesting question – you can use I can understand there may be the cases when the column store index is not ideal and needs to be ignored the same. You can use the query hint IGNORE_NONCLUSTERED_COLUMNSTORE_INDEX to ignore the column store index. The SQL Server Engine will use any other index which is best after ignoring the column store index. 2012 Storing Variable Values in Temporary Array or Temporary List SQL Server does not support arrays or a dynamic length storage mechanism like list. Absolutely there are some clever workarounds and few extra-ordinary solutions but everybody can;t come up with such solution. Additionally, sometime the requirements are very simple that doing extraordinary coding is not required. Here is the simple case. Move Database Files MDF and LDF to Another Location It is not common to keep the Database on the same location where OS is installed. Usually Database files are in SAN, Separate Disk Array or on SSDs. This is done usually for performance reason and manageability perspective. Now the challenges comes up when database which was installed at not preferred default location and needs to move to a different location. Here is the quick tutorial how you can do it. UNION ALL and ORDER BY – How to Order Table Separately While Using UNION ALL If your requirement is such that you want your top and bottom query of the UNION resultset independently sorted but in the same result set you can add an additional static column and order by that column. Let us re-create the same scenario. Copy Data from One Table to Another Table – SQL in Sixty Seconds #031 – Video http://www.youtube.com/watch?v=FVWIA-ACMNo Reference: Pinal Dave (http://blog.sqlauthority.com)Filed under: Memory Lane, PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology

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  • GNU screen multiuser mode is broken in OS X 10.6 (Snow Leopard)

    - by schustafa
    I'm using GNU screen for remote pair programming. Let's call the local account for the remote user 'pairpair'. I have the following lines in my .screenrc: multiuser on acladd pairpair I have run sudo chmod u+s /usr/bin/screen. However, when the remote user tries to connect to my screen with the command screen -r [my_account_name]/[pid_of_screen] I receive the following message: Attach attempt with bad pid(xxx) The pid listed in the error message matches the pid of the screen process run by the remote user. The remote user's screen process hangs; my screen session continues happily along after the error message disappears. I've tried using both the built-in screen (at /usr/bin/screen) and the screen available from MacPorts, but I get the same error in both cases. This worked on OS X 10.5 (Leopard). I've googled around for the error message, but most of the hits relate to some BSD bug from 2003 or so (which was fixed). Has anyone else seen this behavior? Does anyone have any idea how to make multiuser support in screen work in SL?

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  • Windows 7 Blank Screen on Boot / Login

    - by Greg
    I have a new system that's having a few problems... sometimes (seems to be when the PC is cold, i.e. has been switched off for a while, though that could be my imagination) I get a blank blue screen when I boot up. The system boots normally and auto-logs-in. The desktop loads and I'm even able to launch applications, but then everything disappears and the screen goes to the default windows desktop blue colour (not the desktop image, just a plain blue with no mouse cursor). At this point the machine completely locks up - I'm unable to even toggle Num Lock and have to hold in the power button for 5 seconds to kill it. Interestingly if I manage to launch some applications before it goes blank, they will usually crash... sometimes explorer.exe will crash too. When I reboot, the system is fine and stable. I've installed the latest graphics drivers and run memtest86+ for 6 passes (and counting) with no errors. The system specs are: CPU: Intel I7 2.66 @ 3.4GHz RAM: 6GB (3 * 2GB DDR3) HDD: 128GB Crucial M225 SSD Motherboard: Gigabyte EX58-UD3R Gfx: ATI Radeon Sapphire 5870 1GB Note: There are a few similar questions but I haven't found one that matches my symptoms

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  • DevConnections Conference

    - by ScottGu
    The excellent DevConnections conference will be held in Florida later this month (March 27th to 30th).  DevConnections features multiple concurrent tracks – including ASP.NET Connections, Silverlight Connections, Visual Studio Connections, SQL Server Connections, and SharePoint Connections. I’ll be doing a keynote on the first day, and there will be dozens of fantastic talks that week by some of the best presenters in the .NET community.  You can learn more about the conference here. I highly recommend the conference – and hope to meet up with some of you there! Scott P.S. Use the discount code “DevCon1” to save $200 when registering.

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  • Cumulative Feature Overviews For PeopleSoft 9.2 Now Available

    - by John Webb
    Cumulative Feature Overviews (aka CFO's), are a great tool to start your fit gap analysis for PeopleSoft 9.2.      Built into an Excel spreadsheet, it enables you to quickly understand major changes that have occurred across multiple releases for any give product.    For example, if you are on PeopleSoft Accounts Payable 8.9 and are looking for the changes that have occurred between 8.9 and 9.2, the CFO tool provides a list of these changes for all releases since PeopleSoft 8.9 with detailed descriptions.    Customers and partners can now download the 9.2 version of the CFO's in My Oracle Support at the link below. PeopleSoft Cumulative Feature Overview Tool Homepage [ID 1117033.1]

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  • Abstract class + Inheritance vs Interface

    - by RealityDysfunction
    Hello fellow programmers, I am reading a book on C# and the author is comparing Abstract classes and Interfaces. He claims that if you have the following "abstract class:" abstract class CloneableType { public abstract object Clone(); } Then you cannot do this: public class MiniVan : Car, CloneableType {} This, I understand. However he claims that because of this inability to do multiple inheritance that you should use an interface for CloneableType, like so: public interface ICloneable { object Clone(); } My question is, isn't this somewhat misleading, because you can create an abstract class which is "above" class Car with the method Clone, then have Car inherit that class and then Minivan will inherit Car with all these methods, CloneAble class - Car class - Minivan Class. What do you think? Thanks.

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  • How to write reusable code in node.js

    - by lortabac
    I am trying to understand how to design node.js applications, but it seems there is something I can't grasp about asynchronous programming. Let's say my application needs to access a database. In a synchronous environment I would implement a data access class with a read() method, returning an associative array. In node.js, because code is executed asynchronously, this method can't return a value, so, after execution, it will have to "do" something as a side effect. It will then contain some code which does something else than just reading data. Let's suppose I want to call this method multiple times, each time with a different success callback. Since the callback is included in the method itself, I can't find a clean way to do this without either duplicating the method or specifying all possible callbacks in a long switch statement. What is the proper way to handle this problem? Am I approaching it the wrong way?

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  • Assets not served - Apache Reverse proxy - Diaspora

    - by Matt
    I have succeeded in installing Diaspora* on my subdomain diaspora.mattaydin.com. I have VPS running CentOS 5.7 with Plesk installed. By means of an vhost.conf and vhost_ssl.conf file I, (with the help of another gentleman) have managed to reverse proxy the app. vhost.conf: ServerName diaspora.mattaydin.com ServerAlias *.diaspora.mattaydin.com <Directory /home/diaspora/diaspora/public> Options -Includes -ExecCGI </Directory> DocumentRoot /home/diaspora/diaspora/public RedirectPermanent / https://diaspora.mattaydin.com vhost_ssl.conf ServerName diaspora.mattaydin.com DocumentRoot /home/diaspora/diaspora/public RewriteEngine On RewriteCond %{DOCUMENT_ROOT}/%{REQUEST_FILENAME} !-f RewriteRule ^/(.*)$ balancer://upstream%{REQUEST_URI} [P,QSA,L] <Proxy balancer://upstream> BalancerMember http://127.0.0.1:3000/ </Proxy> ProxyRequests Off ProxyVia On ProxyPreserveHost On RequestHeader set X_FORWARDED_PROTO https <Proxy *> Order allow,deny Allow from all </Proxy> <Directory /home/diaspora/diaspora/public> Options -Includes -ExecCGI Allow from all AllowOverride all Options +Indexes </Directory> DocumentRoot /home/diaspora/diaspora/public Basically it's working. However, the only thing that's not working are the assets. The do not get loaded not the server, as seen on diaspora.mattaydin.com The error messages I get in the access_ssl.log are a lot of: 11/Dec/2012:19:04:05 +0100] "GET /robots.txt HTTP/1.1" 404 2811 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_2) AppleWebKit/536.26.17 (KHTML, like Gecko) Version/6.0.2 Safari/536.26.17" The error messages I get from diaspora's log file is: Started GET "//assets/branding/logo_large.png" for 77.250.99.193 at 2012-12-11 20:13:11 +0100 ActionController::RoutingError (No route matches [GET] "/assets/branding/logo_large.png"): lib/rack/chrome_frame.rb:39:in call' lib/unicorn_killer.rb:35:incall' Hope you guys can help me out. If you need anything else please let me know Thanks in advance, Matt

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  • Does software rot refer primarily to performance, or to messy code?

    - by Kazark
    Wikipedia's definition of software rot focuses on the performance of the software. This is a different usage than I am used to; I had thought of it much more in terms of the cleanliness and design of the code—in terms of the code's having all the standard quality characteristics: readability, maintainability, etc. Now, performance is likely to go down when the code becomes unreadable, because no one knows what is going on. But does the term software rot have special reference to performance? or am I right in thinking it refers to the cleanliness of the code? or is this perhaps a case of multiple senses of the term being in common usage—from the user's perspective, it has do with performance; but for the software craftsman, it has to do more specifically with how the code reads?

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  • Removing Duplicate Data From SQL Query Output For Display On A Web Page [migrated]

    - by doubleJ
    I had asked a similar question on stackoverflow but didn't really get anywhere. This page shows the output that I'm currently getting from my MSSQL server. I have a table of venue information (name, address, etc...) that our events happen on. Separately, I have a table of the actual events that are scheduled (an event may happen multiple times in one day and/or over multiple days). I join those tables with this query: <?php try { $dbh = new PDO("sqlsrv:Server=localhost;Database=Sermons", "", ""); $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); $sql = "SELECT TOP (100) PERCENT dbo.TblSermon.Day, dbo.TblSermon.Date, dbo.TblSermon.Time, dbo.TblSermon.Speaker, dbo.TblSermon.Series, dbo.TblSermon.Sarasota, dbo.TblSermon.NonFlc, dbo.TblJoinSermonLocation.MeetingName, dbo.TblLocation.Location, dbo.TblLocation.Pastors, dbo.TblLocation.Address, dbo.TblLocation.City, dbo.TblLocation.State, dbo.TblLocation.Zip, dbo.TblLocation.Country, dbo.TblLocation.Phone, dbo.TblLocation.Email, dbo.TblLocation.WebAddress FROM dbo.TblLocation RIGHT OUTER JOIN dbo.TblJoinSermonLocation ON dbo.TblLocation.ID = dbo.TblJoinSermonLocation.Location RIGHT OUTER JOIN dbo.TblSermon ON dbo.TblJoinSermonLocation.Sermon = dbo.TblSermon.ID WHERE (dbo.TblSermon.Date >= { fn NOW() }) ORDER BY dbo.TblSermon.Date, dbo.TblSermon.Time"; $stmt = $dbh->prepare($sql); $stmt->execute(); $stmt->setFetchMode(PDO::FETCH_ASSOC); foreach ($stmt as $row) { echo "<pre>"; print_r($row); echo "</pre>"; } unset($row); $dbh = null; } catch(PDOException $e) { echo $e->getMessage(); } ?> So, as it loops through the query results, it creates an array for each record and ends up like this: Array ( [Day] => Tuesday [Date] => 2012-10-30 00:00:00.000 [Time] => 07:00 PM [Speaker] => Keith Moore [Location] => The Ark Church [Pastors] => Alan & Joy Clayton [Address] => 450 Humble Tank Rd. [City] => Conroe [State] => TX [Zip] => 77305.0 [Phone] => (936) 756-1988 [Email] => [email protected] [WebAddress] => http://www.thearkchurch.org ) Array ( [Day] => Wednesday [Date] => 2012-10-31 00:00:00.000 [Time] => 07:00 PM [Speaker] => Keith Moore [Location] => The Ark Church [Pastors] => Alan & Joy Clayton [Address] => 450 Humble Tank Rd. [City] => Conroe [State] => TX [Zip] => 77305.0 [Phone] => (936) 756-1988 [Email] => [email protected] [WebAddress] => http://www.thearkchurch.org ) Array ( [Day] => Tuesday [Date] => 2012-11-06 00:00:00.000 [Time] => 07:00 PM [Speaker] => Keith Moore [Location] => Fellowship Of Faith Christian Center [Pastors] => Michael & Joan Kalstrup [Address] => 18999 Hwy. 59 [City] => Oakland [State] => IA [Zip] => 51560.0 [Phone] => (712) 482-3455 [Email] => [email protected] [WebAddress] => http://www.fellowshipoffaith.cc ) Array ( [Day] => Wednesday [Date] => 2012-11-14 00:00:00.000 [Time] => 07:00 PM [Speaker] => Keith Moore [Location] => Faith Family Church [Pastors] => Michael & Barbara Cameneti [Address] => 8200 Freedom Ave NW [City] => Canton [State] => OH [Zip] => 44720.0 [Phone] => (330) 492-0925 [Email] => [WebAddress] => http://www.myfaithfamily.com ) As you can see, The Ark Church and its associated contact information is duplicated, so when I work with those arrays and output them to the page, I see a bunch of duplicate content. I'd like to remove the duplicate information so that I get results similar to this: The Ark Church Alan & Joy Clayton 450 Humble Tank Rd. Conroe, TX 77305 (936) 756-1988 [email protected] http://www.thearkchurch.org Meetings: Tuesday, 2012-10-30 07:00 PM Wednesday, 2012-10-31 07:00 PM Fellowship Of Faith Christian Center Michael & Joan Kalstrup 18999 Hwy. 59 Oakland, IA 51560 (712) 482-3455 [email protected] http://www.fellowshipoffaith.cc Meetings: Tuesday, 2012-11-06 07:00 PM Faith Family Church Michael & Barbara Cameneti 8200 Freedom Ave NW Canton, OH 44720 (330) 492-0925 http://www.myfaithfamily.com Meetings: Wednesday, 2012-11-14 07:00 PM It doesn't necessarily have to end up like that (I'm not looking for code specific for these results, but a concept of how to not show the duplicated information). I'm assuming that an additional foreach or while will do it, but I haven't figured out any logic that says <?php if ($location == $previouslocation) echo ""; ?>.

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  • Use virtual pageviews for all goal tracking

    - by Jeff Wu
    Hi Pro Webmasters, I'm new to Google Analytics and I'm wondering if it would be cleaner to user virtual pageviews for all the goal tracking on my website instead of using a mix of regular page views and virtual pageviews. I know in most cases this is just semantics but there are multiple pages where the same goal can be achieved and I think it would be cleaner just to fire the same virtual pageview instead of having two different goal pages. Will this model also give developers more flexibility when they do development? I know we are moving to a CMS and urls can get hairy, so I think this might be a good way to make analytics portion of the site "future proof". Any thoughts are appreciated! Thanks.

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  • Star Trail Photos Taken from the International Space Station

    - by Jason Fitzpatrick
    While most people have seen a star trail photo or two, seeing a set of star trail photos taken from over 300 miles above the Earth’s surface is a treat. Courtesy of Astronaut and Expedition 31 Flight Engineer Don Pettit, the photos capture star trails from the vantage point of the International Space Station. He explains his technique: My star trail images are made by taking a time exposure of about 10 to 15 minutes. However, with modern digital cameras, 30 seconds is about the longest exposure possible, due to electronic detector noise effectively snowing out the image. To achieve the longer exposures I do what many amateur astronomers do. I take multiple 30-second exposures, then ‘stack’ them using imaging software, thus producing the longer exposure. Hit up the link below for the full Flickr set of the star trails. ISS Star Trails [via Smithsonian Magazine] HTG Explains: What Is RSS and How Can I Benefit From Using It? HTG Explains: Why You Only Have to Wipe a Disk Once to Erase It HTG Explains: Learn How Websites Are Tracking You Online

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  • A Method for Reducing Contention and Overhead in Worker Queues for Multithreaded Java Applications

    - by Janice J. Heiss
    A java.net article, rich in practical resources, by IBM India Labs’ Sathiskumar Palaniappan, Kavitha Varadarajan, and Jayashree Viswanathan, explores the challenge of writing code in a way that that effectively makes use of the resources of modern multicore processors and multiprocessor servers.As the article states: “Many server applications, such as Web servers, application servers, database servers, file servers, and mail servers, maintain worker queues and thread pools to handle large numbers of short tasks that arrive from remote sources. In general, a ‘worker queue’ holds all the short tasks that need to be executed, and the threads in the thread pool retrieve the tasks from the worker queue and complete the tasks. Since multiple threads act on the worker queue, adding tasks to and deleting tasks from the worker queue needs to be synchronized, which introduces contention in the worker queue.” The article goes on to explain ways that developers can reduce contention by maintaining one queue per thread. It also demonstrates a work-stealing technique that helps in effectively utilizing the CPU in multicore systems. Read the rest of the article here.

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  • "Unrecoverable error" during installation

    - by Sal
    I have an old Dell computer and I want to switch from windows xp and install the new ubuntu. I have tried multiple times to download it via cd-r but keep getting the same error message: unrecoverable error. The error happens after the menu which lists try ubuntu, install ubuntu, etc.It only gets as far as the Screen with a toolbar on the top that includes power, sound, and two arrows. That is when the message displays. switching to desktop version to find what the problem is( or something like that.) What is going wrong?

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  • Computer-controlled Lights and Music Synced into Christmas Rock Spectacular

    - by Jason Fitzpatrick
    This spectacular computer controlled and synchronized lighting display combines thousands of feet of LED lighting, multiple controllers, and a rock medley to great effect. The above display started life as the personal Christmas light display of Sioux Falls, ND resident Joe Noe. When Noe moved, he donated his display to a local mall in order to preserve the tradition of people stopping by to see it and making donations to the Make-A-Wish foundation. The local mall, Western Mall, expanded the display and added in even more LEDs and controllers. The end result is an impressive display synced to a Christmas rock medley by UK musician Richard Campbell. [via Mashable] Secure Yourself by Using Two-Step Verification on These 16 Web Services How to Fix a Stuck Pixel on an LCD Monitor How to Factory Reset Your Android Phone or Tablet When It Won’t Boot

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  • How to choose a job? [closed]

    - by Aadi Droid
    When given multiple opportunities from various software giants, as a fresher out of school how should one decide which company to go for? Just as an example I have offers from two companies, won't name them but the two biggest dream companies for any SDE. While one company offers tremendous learning opportunites and and a good pay but coupled with really bad employee support and perks. While the other offers a relaxed work environment where learning happens by choice, with a slightly lower pay but amazing employee facilities and perks. Assuming the fresher has a plan to go for his masters degree in two years what are the most important things he should be looking at?

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  • What kind of steering behaviour or logic can I use to get mobiles to surround another?

    - by Vaughan Hilts
    I'm using path finding in my game to lead a mob to another player (to pursue them). This works to get them overtop of the player, but I want them to stop slightly before their destination (so picking the penultimate node works fine). However, when multiple mobs are pursuing the mobile they sometimes "stack on top of each other". What's the best way to avoid this? I don't want to treat the mobs as opaque and blocked (because they're not, you can walk through them) but I want the mobs to have some sense of structure. Example: Imagine that each snake guided itself to me and should surround "Setsuna". Notice how both snakes have chosen to prong me? This is not a strict requirement; even being slightly offset is okay. But they should "surround" Setsuna.

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