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• How to use hardware threads in C# dot net code running on multicore machine ?

  - by Techee

  How to use hardware threads in C sharp code running on multi core machine ? Any example will be appreciated. I wish to run the two threads parallelly on two cores of my machine. If I create normal software threads in C sharp they may run on single core. Is it possible to run these two threads implicitly parallel on two cores so as to get better performance ?

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• .Net 4.0 Memory-Mapped Files verses RDMS Storage

  - by Harry

  I'm interested in people's thoughts comparing storing data in a traditional SQL based Database or utilising a Memory-Mapped File such as the one in the new .Net 4.0 runtime. The data in question would be arrays of simple structures. Obvious pros and cons: SQL Database Pros Adhoc query support SQL Management Tools Schema changes (adding more columns and setting default values) Memory-Mapped Pros Lighter overhead? (this is an assumption on my part) Shareable between process threads Any others? Is it worth it for performance gains?

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• Is it bad to explicitly compare against boolean constants?

  - by polygenelubricants

  Is it bad to write: if (b == false) //... while (b != true) //... Is it always better to instead write if (!b) //... while (!b) //... Presumably there is no difference in performance (or is there?), but how do you weigh the explicitness, the conciseness, the clarity, the readability, etc between the two?

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• innerHTML and event delegation

  - by Mark Gerrard

  Hello, I have a containing div that has multiple divs within which is updated every 25ms using innerHTML (for performance reasons). I have tried using event delegation to capture events but nothing I seem to do captures the click event. I think this may be due to the speed that the contents are getting updated. Any ideas would be very welcome. Thanks Mark

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• DataSet v/s Database

  - by Hemanshu Bhojak

  While designing applications it is a very good practice to have all the business logic in one place. So why then we sometimes have the business logic in stored procs? Can we fetch all data from the DB and store it in a DataSet and then process it? What would be the performance of the app in this scenario?

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• Why multitasking is not supported in iPhone ?

  - by srikanth rongali

  Many are saying that Apple has restricted it for better performance. It should increase the size of RAM to support multitasking. So, they Apple is not allowing it. But some say that Cocoa Touch applications can't be multitasking as iPhone has only one window and views on it. But I could not understand what is the correct reason for this ? Please clarify me.

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• What is the best way to scale images in Java?

  - by Peter Kelley

  I have a web application written in Java (Spring, Hibernate/JPA, Struts2) where users can upload images and store them in the file system. I would like to scale those images so that they are of a consistent size for display on the site. What libraries or built in functions will offer the best results? I will consider the following criteria in making my decision (in this order): Free/Open Source (essential) Easy to implement Quality of results Performance Size of executable

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• Compiling Ruby and Python interpreters with Clang?

  - by kerkeslager

  I'm just curious; are there any benchmarks about how compiling interpreters for dynamic languages with Clang affects the performance of these languages? Do those interpreters even compile?

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• why is unbounded_array more efficient than vector?

  - by Neil G

  It says here that The unbounded array is similar to a std::vector in that in can grow in size beyond any fixed bound. However unbounded_array is aimed at optimal performance. Therefore unbounded_array does not model a Sequence like std::vector does. What does this mean?

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• How to pick a chunksize for python multiprocessing with large datasets

  - by Sandro

  I am attempting to to use python to gain some performance on a task that can be highly parallelized using http://docs.python.org/library/multiprocessing. When looking at their library they say to use chunk size for very long iterables. Now, my iterable is not long, one of the dicts that it contains is huge: ~100000 entries, with tuples as keys and numpy arrays for values. How would I set the chunksize to handle this and how can I transfer this data quickly? Thank you.

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• Difference between writing to file atomically and not

  - by Mark Szymanski

  What is the difference in writing to files atomically on the iPhone in objective-c and not, is there any performance difference between the two? Thanks in advance!

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• Is it bad to explicitly compare against boolean constants e.g. if (b == false) in Java?

  - by polygenelubricants

  Is it bad to write: if (b == false) //... while (b != true) //... Is it always better to instead write: if (!b) //... while (!b) //... Presumably there is no difference in performance (or is there?), but how do you weigh the explicitness, the conciseness, the clarity, the readability, etc between the two? Note: the variable name b is just used as an example, ala foo and bar.

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• I want Result Like Google

  - by parvaiz ahmad

  tbl_Phrases id Phrase 1 World top leading Company 2 Top Leading World Agencies 3 Top Companies 5 Top Leading Companies 6 World Top Market 7 Top Companies 8 Economic Market 9 World Company i want result by full text search where there is high proximity of relevance if i search like : get all phrase where phrase like World top leading Company the result should be like World top leading Company Top Leading Companies Top Leading World Agencies Top Companies World Company World Top Market means i want the phrase at the top whose relevance is 100% then the relevance decreases like 90%, 80% .....up to 10% at last if any word from input matches with any word from phrase

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• Network.downloadfile is very slow

  - by user324067

  I have tried using the My.Computer.Network.DownloadFile method but unfortunately it is slow. Executing the simple command below takes ~5-10 secs, which I would say is a lot longer than expected for downloading a 9 kb file. `My.Computer.Network.DownloadFile("http://www.google.dk", "j:\temp\test.html")` I am connecting via a high-speed connection (10GB) from a Win7 machine. Do anyone know of any explanations for this behavior? Hope that you can help me out with this. Kristoffer

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• Linq Expression Trees in Compact Framework.

  - by Michal Drozdowicz

  The lack of expression trees in Compact Framework has bugged me for some time now, but I haven't really looked for a solution. Today, I've found a blog post about an alternative System.Linq.Expressions built on top of Mono System.Core and used e.g. by db4o (you can find it here). My question is - have you used this library and if so, what were your experiences with it (especially regarding performance)?

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• Java equivalent of C++ std::map?

  - by Rudiger

  I'm looking for a Java class with the characteristics of C++ std::map's usual implementation (as I understand it, a self-balancing binary search tree): O(log n) performance for insertion/removal/search Each element is composed of a unique key and a mapped value Keys follow a strict weak ordering I'm looking for implementations with open source or design documents; I'll probably end up rolling my own support for primitive keys/values. This question's style is similar to: Java equivalent of std::deque, whose answer was "ArrayDeque from Primitive Collections for Java".

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• Oracle : Identifying duplicates in a table without index

  - by user288031

  When I try to create a unique index on a large table, I get a unique contraint error. The unique index in this case is a composite key of 4 columns. Is there an efficient way to identify the duplicates other than : select col1, col2, col3, col4, count() from Table1 group by col1, col2, col3, col4 having count() 1 The explain plan above shows full table scan with extremely high cost, and just want to find if there is another way. Thanks !

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• ADOdb Lite versus MySqli

  - by Sofyan

  Hello, I am working an a project to build an arcade site with PHP. I am considering using ADOdb Lite or MySqli. Which one is better for performance, speed and security? Thanks,

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• When is the Data Vault model the right model for a data-warehouse?

  - by Stephan Eggermont

  I recently found a reference to 'Data Vault modeling' as a model for data-warehouses. The models I've seen before are Inmon and Kimball. The author refers to possible performance problems due to the joins needed. It looks like a nice model, but I wonder about the gotcha's. Are there any experience reports on-line?

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• Drawbacks of Dynamic Query in Sqlserver 2005 ?

  - by KuldipMCA

  I have using the many dynamic Query in my database for the procedures because my filter is not fix so i have taken @filter as parameter and pass in the procedure. Declare @query as varchar(8000) Declare @Filter as varchar(1000) set @query = 'Select * from Person.Address where 1=1 and ' + @Filter exec(@query) Like that my filter contain any Field from the table for comparison. It will affect my performance or not ? is there any alternate way to achieve this type of things

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• Choosing between WPF and Silverlight

  - by user43498

  Hi, We have an existing web application developed using ASP.NET/Ajax We are planning to move it to either WPF or Silverlight. Can someone please compare these 2 technologies with respect to productivity,performance, maintainability,trade-offs, their pros and cons etc ? Thanks for reading.

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• MySQLi -- OO or Procedural?

  - by Kerry

  I know OO is the "way to go" but I'm thinking procedural might be easier to use in the wrapper I'm making. Any difference in performance between MySQLi Object Oriented vs Procedural?

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• What's faster to parse lots of data (5Mb): eval or json?

  - by AlfaTeK

  I want to get, via ajax, a collection of data objects and parse them into JS data. Currently I have 2 choices: - Server returns valid javascript code and then I eval it. - Server returns JSON object and then I eval the json object What is the fastest of these in Firefox? (I only care about the "parsing" performance, not server or data transfer)

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• How to make a simple audio equalizer for the iPhone?

  - by Flocked

  I want to make a simple audio equalizer for the iPhone, but I don't know how to start. The equalizer should be really simple and just change bass, high, distortion and maybe echo and chorus. How can I start? Maybe a sample code would be helpful.

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• What is the best way to download files via HTTP using c#

  - by Shamika

  Hi, In one of my application I'm using the WebClient class to download files from a web server. Depending on the web server sometimes the application download millions of documents. It seems to be when there are lot of documents, performance vise the WebClient doesn't scale up well. Also it seems to be the WebClient doesn't immediately close the connection it opened for the WebServer even after it successfully download the particular document. I would like to know what other alternatives I have. Thanks, Shamika

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