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• Symmetric Encryption: Performance Questions

  - by cam

  Does the performance of a symmetric encryption algorithm depend on the amount of data being encrypted? Suppose I have about 1000 bytes I need to send over the network rapidly, is it better to encrypt 50 bytes of data 20 times, or 1000 bytes at once? Which will be faster? Does it depend on the algorithm used? If so, what's the highest performing, most secure algorithm for amounts of data under 512 bytes?

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• SimpleDB as Denormalized DB

  - by Max

  In an environment where you have a relational database which handles all business transactions is it a good idea to utilise SimpleDB for all data queries to have faster and more lightweight search? So the master data storage would be a relational DB which is "replicated"/"transformed" into SimpleDB to provide very fast read only queries since no JOINS and complicated subselects are needed.

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• Federated (Synced) Subversion servers?

  - by Adam Haile

  Is it possible to create "federated" Subversion servers? As in one server at location A and another at location B that sync up their local versions of the repository automatically. That way when someone at either location interacts with the repository they are accessing their respective local server and therefore has faster response times.

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• Best practice or performance difference between VB.NET ToString() and & concatenation

  - by slolife

  When I am concatenating object values together to form a string in VB.NET, is there a difference in performance or a recommended best practice between using the & concat or the + concat with calls to .ToString() on each object? Example (which is faster or best practice): Dim result1 As String = 10 & "em" Dim result2 As String = 10.ToString() & "em"

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• Does speed of an C/C++, Windows console application depend on whether the target is 32 or 64 bit?

  - by Anon

  Supposing that memory is not an issue does targeting a 64 bit OS make a C/C++ Windows console application run faster? Update: Prompted by a few comments/answers the application involves statistical algorithms (e.g., linear algebra, random number draws etc).

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• PHP Speed - Many Echos vs Building a String

  - by Chris

  Wondering if anyone knows if either of these methods would produce an output faster: Method 1 for ($i=1;$i<99999;$i++) { echo $i, '<br>'; } or Method 2 for ($i=1;$i<99999;$i++) { $string .= $i . '<br>'; } echo $string; Thanks for any input you have.

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• Finding smallest angle between vectors in logarithmic time.

  - by Christian

  I have n=10000 10 dimensional vectors. For every vector v1 I want to know the vector v2 that minimizes the angle between v1 and v2. Is there a way to solve this problem faster than O(n^2)?

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• remove duplicate from string in PHP

  - by Adnan

  Hello, I am looking for the fastest way to remove duplicate values in a string separated by commas. So my string looks like this; $str = 'one,two,one,five,seven,bag,tea'; I can do it be exploding the string to values and then compare, but I think it will be slow. what about preg_replace() will it be faster? Any one did it using this function?

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• Check whether a string is parsable into Long without try-catch?

  - by Sergey

  Hello, Long.parseLong( string ) throws an error if string is not parsable into long. Is there a way to validate the string faster than using try-catch? Thanks

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• delete all from table

  - by I__

  what's faster? DELETE * FROM table_name; or DELETE * FROM table_name where 1=1; why? does truncate table work in access?

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• C# - Fast and simple multi dimensional data structures?

  - by Jeremy Rudd

  I need to store multi-dimensional data consisting of numbers in a manner thats easy to work with. I'm capturing data in real time, and once processed I would destroy and GC older data. This data structure must be fast so it won't hit my overall app performance. The faster the better. What are my choices in terms of platform supported data structures? I'm using VS 2010. and .NET 4.

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• Is it possible to make the iPhone keyboard invisible / remove it without resigning first responder?

  - by Alex Gosselin

  I am looking for a way to show my own input view (a UITableView) to enter certain keywords in a UITextView faster than typing them, and also be able to type into this text view the normal way. My solution has a button that causes the keyboard to disappear, revealing the table view underneath it. Problem is I can't figure out how to make the keyboard go away without resigning first responder, and losing the cursor. Has anyone accomplished this before? Thanks for any help.

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• Is it possible to use the CommonJS libraries yet?

  - by Jon Winstanley

  I am interested in getting started with CommonJS. With JavaScript frameworks getting faster all the time, and parsing engines and compilers making JavaScript incredibly quick, it is surprising that a project such as CommonJS has not been initiated sooner. What steps are involved in getting a test project up and running with what has been created so far?

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• Future of IE9: Opacity + Performance

  - by chris_l

  I just tried the IE9 "Second Internet Explorer Platform Preview" - which supports CSS opacity now. That's nice, but I tried it with one of my website prototypes, and it's quite slow when scrolling etc. Admittedly, the prototype uses hundreds of images with opacity != 1, but everything is snappy with current versions of Firefox, Safari, Chrome and Opera. Does anybody know, if there are plans for IE9 to become faster in this area? Even rumours about this would be interesting in this case.

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• Problem with initializing a hash in ruby

  - by Cyborgo

  Hi, I have a text file from which I want to create a Hash for faster access. My text file is of format (space delimited) author title date popularity I want to create a hash in which author is the key and the remaining is the value as an array. created_hash["briggs"] = ["Manup", "Jun,2007", 10] Thanks in advance.

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• Oracle Merge vs Select then Insert or Update

  - by DRTauli

  What is faster? the Merge statement MERGE INTO table USING dual ON (rowid = 'some_id') WHEN MATCHED THEN UPDATE SET colname = 'some_val' WHEN NOT MATCHED THEN INSERT (rowid, colname) VALUES ('some_id', 'some_val') or querying a select statement then using an update or insert statement. SELECT * FROM table where rowid = 'some_id' if rowCount == 0 INSERT INTO table (rowid,colname) VALUES ('some_id','some_val') else UPDATE table SET colname='some_val' WHERE rowid='some_id'

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• 2k rows update is very slow in MySQL

  - by sergeik

  Hi all, I have 2 tables: 1. news (450k rows) 2. news_tags (3m rows) There are some triggers on news table update which updating listings. This SQL executes too long... UPDATE news SET news_category = some_number WHERE news_id IN (SELECT news_id FROM news_tags WHERE tag_id = some_number); #about 3k rows How can I make it faster? Thanks in advance, S.

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• VirtualStringTree hide node(s)

  - by michal

  Hi, is that possible to hide specific nodes in VirtualStringTree? I'm implementing "filtering" feature (the VST acts as a list with columns), and I'd like to avoid reloading content each time the filter is changed - instead, much faster would be to tell VST not to render specific items ... any solutions?

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• Php pi help... (Loops)

  - by James Rattray

  Is this iteration the best? (Pi^2)/12 = 1 - 1/4 + 1/9 - 1/16 + 1/25 etc. -For converging faster? If not please answer with the iteration -preferably in the form above (an example) -not a splat of algebra ... I'm doing this to find Pi to 1,000,000,000 places online. http://www.zombiewrath.com/superpi.php or my 10,000 one: http://www.zombiewrath.com/pi.php

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• C++: Is it good practice to make getters and setters inline?

  - by Martijn Courteaux

  Hi, The title says it all. public: inline int GetValue() const { return m_nValue; } inline void SetValue(int nNewValue) { this -> m_nValue = nNewValue; } On Learn C++, they said it would run faster. So, I thought it would be great. But maybe, there are some negative points to it.

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• Vim navigation clunkiness

  - by Sean Chambers

  I've committed myself to diving into vim to become faster at writing code for ruby/python and I'm having a hard time navigating around files. Mainly, I'm referring to switching between insert mode and navigation modes. Maybe I'm just not completely used to the editor yet but it feels very awkward to constantly be switching in and out of insert mode. Is this something that will go away with time? Are there any tricks to getting quicker at moving in and out of insert mode?

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• Prevent Apache from chunking gzipped content

  - by Bear

  When using mod_deflate in Apache2, Apache will chunk gzipped content, setting the Transfer-encoding: chunked header. While this results in a faster download time, I cannot display a progress bar. If I handle the compression myself in PHP, I can gzip it completely first and set the Content-length header, so that I can display a progress bar to the user. Is there any way to change Apache's behavior, and have Apache set a Content-length header instead of chunking the response, so that I don't have to handle the compression myself?

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• How to resize an image smoothly (with resampling) using Windows API calls?

  - by Clay Nichols

  I need to resize images and resample them so they don't end up all jagged (I think that's called aliasing). I found some code (sorry, lost the link) that does this in pure VB6 code but it's a bit slow (2-5 seconds) and I'm displaying pictures in real time so I need something faster. I seem to recall seeing some examples of doing this with the GDI+ library. An example in VB6 would be ideal, but I can probably work with a simple example with Windows API calls in another language.

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• What is does this error mean when trying to import video in processing?

  - by Adam

  quicktime.qdQDException[QTJava:7.6.6g], -3954=Unknown Error Code, QT.vers:7668000 I'm using osx.... is video processing inherently slow in processing? It's really choppy. Would it be faster if done in Max?

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• Putting 3 million pages in 1 folder vs. putting in a number of sub-folders, which structure is faste

  - by silent

  If I have 3 million pages, which directory structure is better? Method 1. ~/123456789.htm (Putting all the 3 million pages into the same folder without any sub folders) Method 2. ~/789/123456789.htm (Create 999 sub-folders, each sub-folder contains about 3000 pages) For Windows Server 2008, which folder structure is faster? (For file creation, reading and deletion)

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