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• Boost asio async vs blocking reads, udp speed/quality

  - by Dolphin

  I have a quick and dirty proof of concept app that I wrote in C# that reads high data rate multicast UDP packets from the network. For various reasons the full implementation will be written in C++ and I am considering using boost asio. The C# version used a thread to receive the data using blocking reads. I had some problems with dropped packets if the computer was heavily loaded (generally with processing those packets in another thread). What I would like to know is if the async read operations in boost (which use overlapped io in windows) will help ensure that I receive the packets and/or reduce the cpu time needed to receive the packets. The single thread doing blocking reads is pretty straightforward, using the async reads seems like a step up in complexity, but I think it would be worth it if it provided higher performance or dropped fewer packets on a heavily loaded system. Currently the data rate should be no higher than 60Mb/s.

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• HashSet vs. List performance

  - by Michael Damatov

  It's clear that a search performance of the generic HashSet<T> class is higher than of the generic List<T> class. Just compare the hash-based key with the linear approach in the List<T> class. However calculating a hash key may itself take some CPU cycles, so for a small amount of items the linear search can be a real alternative to the HashSet<T>. My question: where is the break-even? To simplify the scenario (and to be fair) let's assume that the List<T> class uses the element's Equals() method to identify an item.

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• Appengine Apps Vs Google bot web crawler

  - by sandeep koduri

  i built an appengine web app cricket.hover.in. The web app consists of about 15k url's linked in it, But even after a long time of my launch, no pages are indexed on google. Any base link place on my root site hover.in are being indexed with in minutes. but i placed the same link home page of root site a long back. but its of no use. can any one analyse , if there is any issue with cricket.hover.in or if bots have any issues with Google app engine actually tested the url using labs app of webmaster tools of google there the return is fine and html is clear. but when tested the same (cricket.hover.in) at the following urls its showing different results of failure www.dnsqueries.com/en/googlebot_simulator.php www.smart-it-consulting.com/internet/google/googlebot-spoofer/ but if i test some of my php or word press links at the above url's the results are good and fine. please help me with this.

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• Throwing exception vs checking null, for a null argument

  - by dotnetdev

  What factors dictate throwing an exception if argument is null (eg if (a is null) throw new ArgumentNullException() ), as opposed to checking the argument if it is null beforehand. I don't see why the exception should be thrown rather than checking for null in the first place? What benefit is there in the throw exception approach? This is for C#/.NET Thanks

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• Desktop development vs Web development

  - by Sahat

  After doing some google search I've came to conclusion that desktop development is shifting to the web development. Recent demos of HTML5 show us 3D accelerated games running inside of a browser. Is it true that desktop development is slowly dying? Would it make more sense learning ASP.NET, Silverlight and HTML5 rather than the desktop side of .NET such as WinForms and WPF. Who is leading current job trends: Software development or Web development? Who will lead in the near future?

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• MongoDB vs. Redis vs. Cassandra for a fast-write, temporary row storage solution

  - by Mark Bao

  Hi there, I'm building a system that tracks and verifies ad impressions and clicks. This means that there are a lot of insert commands (about 90/second average, peaking at 250) and some read operations, but the focus is on performance and making it blazing-fast. The system is currently on MongoDB, but I've been introduced to Cassandra and Redis since then. Would it be a good idea to go to one of these two solutions, rather than stay on MongoDB? Why or why not? Thank you

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• Derby vs PostgreSql Performance Comparison

  - by Austin

  We are doing research right now on whether to switch our postgresql db to an embedded Derby db. Both would be using glassfish 3 for our data layer. Anybody have any opinions or knowledge that could help us decide? Thanks! edit: we are writing some performance tests ourselves right now. Looking for answers more based on experience / first hand knowledge

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• PrestaShop vs. Shopify

  - by Zach L.

  I have seen several Questions comparing different ECommerce CMS's: Prestashop compared to Zen-Cart and osCommerce Magento or Prestashop, which is better? Best php/ruby/python e-commerce solution I was hoping to get some people to weigh in with which they prefer for a relatively small E-shop. I am now primarily looking at PrestaShop and Shopify. I really like that Shopify does the hosting, has quality service, and is simple to understand and theme. However PrestaShop is free and seems to be able to do just as much if not more than Shopify. I have decided that Magento is too clunky for the project, and have read that many other solutions (osCommerce, ZenCart, OpenCart) are outdated, buggy, or just inferior. Thank you!

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• IP Address Lookup in VB.net (XP vs Windows 7)

  - by TheHockeyGeek

  Currently I use the following code to retrieve the IP address of the local workstation... strIPAddress = System.Net.Dns.GetHostEntry(strComputerName).AddressList(0).ToString() This is fine for the Windows XP workstations. However, in Vista and Windows 7, this returns the IPv6 address which is not used at all. Is there a method of setting this to work so it always returns the IPv4 address regardless of platform? I know I can increment the AddressList value to 1 and get the correct IP in Windows 7. The bad part is that this requires going through the motions of identifying the OS and choosing one or the other. The must be some way of specifying IPv4 only. Perhaps getting a result from DNS on the network rather than the workstation itself?

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• String assembly by StringBuilder vs StringWriter and PrintWriter

  - by CPerkins

  I recently encountered an idiom I haven't seen before: string assembly by StringWriter and PrintWriter. I mean, I know how to use them, but I've always used StringBuilder. Is there a concrete reason for preferring one over the other? The StringBuilder method seems much more natural to me, but is it just style? I've looked at several questions here (including this one which comes closest: http://stackoverflow.com/questions/602279/stringwriter-or-stringbuilder ), but none in which the answers actually address the question of whether there's a reason to prefer one over the other for simple string assembly. This is the idiom I've seen and used many many times: string assembly by StringBuilder: public static String newline = System.getProperty("line.separator"); public String viaStringBuilder () { StringBuilder builder = new StringBuilder(); builder.append("first thing" + newline); builder.append("second thing" + newline); // ... several things builder.append("last thing" + newline); return builder.toString(); } And this is the new idiom: string assembly by StringWriter and PrintWriter: public String viaWriters() { StringWriter stringWriter = new StringWriter(); PrintWriter printWriter = new PrintWriter(stringWriter); printWriter.println("first thing"); printWriter.println("second thing"); // ... several things printWriter.println("last thing"); printWriter.flush(); printWriter.close(); return stringWriter.toString(); }

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• window.onload vs document.onload

  - by Chris Ballance

  Which is more widely supported, window.onload or document.onload?

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• Class scope variable vs method scope variable

  - by Masud

  I know that variable scope is enclosed by a start of block { and an end of block }. If the same variable is declared within the block, then the compile error Variable already defined occurs. But take a look at following example. public class Test{ int x=0;// Class scope variable public void m(){ int x=9; //redeclaration of x is valid within the scope of same x. if(true){ int x=7; // but this redeclaration generates a compile time error. } } Here, x can be redeclared in a method, although it's already declared in the class. But in the if block, x can't be redeclared. Why is it that redeclaration of a class scope variable doesn't generate an error, but a method scope variable redeclaration generates an error?

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• Basic C++ Speed (initialization vs adding) and comparison speed

  - by seld

  I was curious if anyone knows which of the following executes faster (I know this seems like a weird question but I'm trying to shave as much time and resources as possible off my program.) int i; i+=1; or int i; i=1; and I also was curious about which comparison is faster: //given some integer i // X is some constant i < X+1 or i<=X

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• Best Practices - Data Annotations vs OnChanging in Entity Framework 4

  - by jptacek

  I was wondering what the general recommendation is for Entity Framework in terms of data validation. I am relatively new to EF, but it appears there are two main approaches to data validation. The first is to create a partial class for the model, and then perform data validations and update a rule violation collection of some sort. This is outlined at http://msdn.microsoft.com/en-us/library/cc716747.aspx The other is to use data annotations and then have the annotations perform data validation. Scott Guthrie explains this on his blog at http://weblogs.asp.net/scottgu/archive/2010/01/15/asp-net-mvc-2-model-validation.aspx. I was wondering what the benefits are of one over the other. It seems the data annotations would be the preferred mechanism, especially as you move to RIA Services, but I want to ensure I am not missing something. Of course, nothing precludes using both of them together. Thanks John

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• "/bin/sh 'ls -l -R'" vs "/bin/sh -c 'ls -l -R'"

  - by Vladimir Bezugliy

  What is the difference between following two commands? /bin/sh 'ls -l -R' /bin/sh -c 'ls -l -R'

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• IE8 browser mode vs document mode

  - by mkoryak

  Can someone please explain the difference between IE8 browser mode and document mode in simple terms? What causes the browser mode to change? What causes the document mode to change? If a user changes the mode(s) via developer tools, does the change remain even if the page is refreshed? I am asking this because we are doing some IE8 testing here, and different people have different combinations of the modes, and i want to try to figure out how this is happening.

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• border:2px solid red VS border:2px red solid

  - by metal-gear-solid

  Are both method valid? both works same. border:2px solid red; and border:2px red solid;

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• Invoice Discount: Negative line items vs Internal properties

  - by FreshCode

  Should discount on invoice items and entire invoices be negative line items or separate properties of an invoice? In a similar question, Should I incorporate list of fees/discounts into an order class or have them be itemlines, the asker focuses more on orders than invoices (which is a slightly different business entity). Discount is proposed to be separate from order items since it is not equivalent to a fee or product and may have different reporting requirements. Hence, discount should not simply be a negative line item. Previously I have successfully used negative line items to clearly indicate and calculate discount, but this feels inflexible and inaccurate from a business perspective. Now I am opting to add discount to each line item, along with an invoice-wide discount. Is this the right way to do it? Should each item have its own discount amount and percentage? Domain Model Code Sample This is what my domain model, which maps to an SQL repository, looks like: public class Invoice { public int ID { get; set; } public Guid JobID { get; set; } public string InvoiceNumber { get; set; } public Guid UserId { get; set; } // user who created it public DateTime Date { get; set; } public decimal DiscountPercent { get; set; } // all lines discount %? public decimal DiscountAmount { get; set; } // all lines discount $? public LazyList<InvoiceLine> InvoiceLines { get; set; } public LazyList<Payment> Payments { get; set; } // for payments received public boolean IsVoided { get; set; } // Invoices are immutable. // To change: void -> new invoice. public decimal Total { get { return (1.0M - DiscountPercent) * InvoiceLines.Sum(i => i.LineTotal) - DiscountAmount; } } } public class InvoiceLine { public int ID { get; set; } public int InvoiceID { get; set; } public string Title { get; set; } public decimal Quantity { get; set; } public decimal LineItemPrice { get; set; } public decimal DiscountPercent { get; set; } // line discount %? public decimal DiscountAmount { get; set; } // line discount amount? public decimal LineTotal { get { return (1.0M - DiscountPercent) * (this.Quantity * (this.LineItemPrice)) - DiscountAmount; } } }

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• ICC vs GCC - Optimization and CPU architecture

  - by Rayne

  Hi all, I'm interested in knowing how GCC differs from Intel's ICC in terms of the optimization levels and catering to specific processor architecture. I'm using GCC 4.1.2 20070626 and ICC v11.1 for Linux. How does ICC's optimization levels (O1 to O3) differ from GCC, if they differ at all? The ICC is able to cater specifically to different architectures (IA-32, intel64 and IA-64). I've read that GCC has the -march compiler option which I think is similar, but I can't find a list of the options to use. I'm using Intel Xeon X5570, which is 64-bit. Are there any other GCC compiler options I could use that would cater my applications for 64-bit Intel CPUs? Thank you. Regards, Rayne

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• Processing xml file VS. processing excel file from .Net

  - by mayap

  Hello All, I would like to ask what should be faster: reading excel file from .Net or reading xml file which contains the same data. The same is for writing. Thank you very much in advance. mayap.

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• Jdeveloper vs java/j2ee/js+extjs ?

  - by ssgam

  Hi All, i am new to the web development environment, having came from a unix/c environment. i've been recently asked to create a web app, which i thought would require postgresql, java/j2ee, and javascript for the client interface. as i had wanted a nicer gui, i've been reading up on extjs, which looks really nice to me. a colleague mentioned that the time needed time needed to learn all these various pieces is time consuming, and Jdeveloper seems to provide most of what we'd need (i was shown a demo, which appears to be able to generate some nice web interfaces). what are the pros and cons with the different approaches ? some i can think of: - jdeveloper is an integrated ide, which creates UI easily, tightly integrated with database. (pro) - jdeveloper will be heavier? (con) - wizard generated code may be harder to refactor ? (con) - java/j2ee/js+extjs needs to develop things from ground up (con) thanks in advance for sharing your experiences and thoughts ... sam

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• open_basedir vs sessions

  - by liquorvicar

  On a virtual hosting server I have the open_basedir set to .:/path/to/vhost/web:/tmp:/usr/share/pear for each virtual host. I have a client who's running WordPress and he's complaining about open_basedir errors thus: PHP WARNING: file_exists() [function.file-exists]: open_basedir restriction in effect. File(/var/lib/php/session/sess_42k7jn3vjenj43g3njorrnrmf2) is not within the allowed path(s): (.:/path/to/vhost/web:/tmp:/usr/share/pear) So the PHP session save_path isn't included in open_basedir but sessions across all sites on the server seems to be working fine apart from in this intermittent instance. I thought that perhaps the default session handler ignored open_basedir and this warning was caused by WP accessing the session file directly. However from what I can see PHP 5.2.4 introduced open_basedir checking to the session.save_path config: http://www.php.net/ChangeLog-5.php#5.2.4 (I am on PHP 5.2.13). Any ideas?

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• SharePoint SPListItem.ContentType.Name - "Message" vs "Discussion" ?

  - by Christopher

  I am writing a C# code to find all of our SharePoint Sites that have emails contained in the Email List page. It appears that some of our email messages are SPListItem.ContentType.Name = "Message" and some of our email messages are SPListItem.ContentType.Name = "Discussion" Aside from the confusion, this is forcing my to cycle through mylist.Folders and mylist.Items in two separate loops, so that I don't miss any of the emails. Is this normal? Any idea why this could be happening? There are threads that contains messages of both types.

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• 503 (Server Unavailable) WebException when loading local XHTML file in Visual C# 2008

  - by kcoppock

  Hello! So I'm currently working on an ePub reader application, and I've been reading through a bunch of regular XML files just fine with System.Xml and XmlDocument: XmlDocument xmldoc = new XmlDocument(); xmldoc.Load(Path.Combine(Directory.GetCurrentDirectory(), "META-INF/container.xml")); XmlNodeList xnl = xmldoc.GetElementsByTagName("rootfile"); However, now I'm trying to open the XHTML files that contain the actual book text, and they're XHTML files. Now I don't really know the difference between the two, but I'm getting the following error with this code (in the same document, using the same XmlDocument and XmlNodeList variable) xmldoc.Load(Path.Combine(Directory.GetCurrentDirectory(), "OEBPS/part1.xhtml")); "WebException was unhandled: The remote server returned an error: (503) Server Unavailable" It's a local document, so I'm not understanding why it's giving this error? Any help would be greatly appreciated. :) I've got the full source code here if it helps: http://drop.io/epubtest (I know the ePubConstructor.ParseDocument() method is horribly messy, I'm just trying to get it working at the moment before I split it into classes)

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• Explicit behavior with checks vs. implicit behavior

  - by Silviu

  I'm not sure how to construct the question but I'm interested to know what do you guys think of the following situations and which one would you prefer. We're working at a client-server application with winforms. And we have a control that has some fields automatically calculated upon filling another field. So we're having a field currency which when filled by the user would determine an automatic filling of another field, maybe more fields. When the user fills the currency field, a Currency object would be retrieved from a cache based on the string introduced by the user. If entered currency is not found in the cache a null reference is returned by the cache object. Further down when asking the application layer to compute the other fields based on the currency, given a null currency a null specific field would be returned. This way the default, implicit behavior is to clear all fields. Which is the expected behavior. What i would call the explicit implementation would be to verify that the Currency object is null in which case the depending fields are cleared explicitly. I think that the latter version is more clear, less error prone and more testable. But it implies a form of redundancy. The former version is not as clear and it implies a certain behavior from the application layer which is not expressed in the tests. Maybe in the lower layer tests but when the need arises to modify the lower layers, so that given a null currency something else should be returned, i don't think a test that says just that without a motivation is going to be an impediment for introducing a bug in upper layers. What do you guys think?

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