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• How much memory does a hashtable use?

  - by Michael

  Would a hashtable/hashmap use a lot of memory if it only consists of object references and int's? As for a school project we had to map a database to objects (that's what being done by orm/hibernate nowadays) but eager to find a good way not to store id's in objects in order to save them again we thought of putting all objects we created in a hashmap/hashtable, so we could easily retrieve it's ID. My question is if it would cost me performance using this, in my opinion more elegant way to solve this problem.

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• Video For Windows disable FILE_FLAG_NO_BUFFERING

  - by cunzlow

  I am using Video For Window's AVIFile functions. When I use AVIFileOpen I notice that it uses the flag FILE_FLAG_NO_BUFFERING when creating the .avi file. ProcessMonitor shows the that file was created with "no buffering". This flag is causing performance issues and I was wondering if there is a way to use this function without that flag.

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• How effecient is a details table?

  - by Jeffrey Lott

  At my job, we have pseudo-standard of creating one table to hold the "standard" information for an entity, and a second table, named like 'TableNameDetails', which holds optional data elements. On average, for every row in the main table will have about 8-10 detail rows in it. My question is: What kind of performance impacts does this have over adding these details as additional nullable columns on the main table?

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• When do we make a call to use between Synchronised method and Synchronised Block

  - by Cricandcric.com

  Can any one please share their experience on "When do we make a call to use between Synchronised method and Synchronised Block" Any Performance Issues?

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• Where should i store data table [ViewState/ Session/ Catch]

  - by Hemant Kothiyal

  Hi I have datatable having around 10 thousand rows. I would like to store this data once for aspx page. When use select different options in page data would be further select from already stored datatable. I then tried solution using ViewState, but as soon as data grow beyond 100 rows, performance degrade. Where should i store data please help?

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• What do you consider the best CMS in Java

  - by Petr Macek

  Which CMS are you using in Java and what is your experience with it (in terms of extensibility, usage comfort, framework API, memory usage, performance etc.). I am looking for suggestions.

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• What are the fundamental differences ASP.net and PHP?

  - by palhmbus

  Are there speed differences, performance issues, and what reasons do businesses have when they choose one or the other... and is there a learning curve steeper for one over the other? Also... are you likely to be paid more using one over the other?

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• nhibernate, entity framework, active records or linq2sql

  - by Omu

  my team is starting a new project on asp.net mvc, and we are wondering what technology for data access to use, how do you think which one is the best, who has the best performance ? which one is easier to use and to maintain ?

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• Dedicated hard disk for SE dbname.dbs files & dedicated ramdisk for /tmp files.

  - by Frank Computer

  INFORMIX-SE 7.2: I would like to dedicate a hard disk, exclusively for my dbname.dbs directory which holds all the .dat and .idx files, and create a ramdisk for my /tmp temporary files in order to improve performance. I would also like to strip down the OS from any unecessary files and processes to minimize overhead for my dedicated application. Is this a good idea and are there any roadmaps for accomplishing this?

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• Batch save in CastleProject ActiveRecord

  - by Alex

  I need to save thousand of records in a database. I am using CastleProject ActiveRecord. The cycle which stores that amount of objects works too long. Is it possible to run saving in a batch using ActiveRecord? What is recommended way to improve performance?

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• Trace IP Adress in Wordpress

  - by Ajith

  I need to trace the ipadress (where my website access)for optional loading of my theme.Explanation: I want to add a share link to twitter and facebok in my application.i think in some countries like china;twitter blocked.Thats why i need to check from where my site is accessing.otherwise which affecting my site's performance.How can we solve this problem in PHP.If anybody have experience please help me..

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• storing images in sqlserver using c#

  - by barq

  i want to store images of my employees with thier profiles in sql server database. i have following reservations. whether i should compress images or not if yes please provide me sample code or article how should i retrieve images efficiently, i an afraid of asp.net application performance issue. i think with ten thousand employee records it will halt or slow down

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• What kinds of strategies are their for paging result sets for web UIs?

  - by predhme

  I am looking at implementing a paging strategy for a domain model who's numbers are in the hundreds of thousands. I am most interested in how websites that are performance conscience achieve this.

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• Which method is best method for speed? in SQL Server, stored procedure

  - by AjmeraInfo

  I have select, insert, update and delete query. If I have to write all queries in the same stored procedure that is good for performance or should I write all queries in separate stored procedures?

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• Geometric Mean: is there a built-in?

  - by doug

  i tried to find a built-in for geometric mean but couldn't. (Obviously a built-in isn't going to save me any time while working in the shell, nor do i suspect there's any difference in accuracy; for scripts i try to use built-ins as often as possible, where the (cumulative) performance gain is often noticeable. In case there isn't one (which i doubt is the case) here's mine. gm_mean = function(a){prod(a)^(1/length(a))}

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• hash_map and stdext:: hash_map?

  - by bit-question

  Under the visual C++, we have " hash_map" and "hash_set". In g++, we have " stdext::hash_map" and " stdext::hash_set". Is there any difference in terms of their respective performance or other factors?

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• SQL Server Text type v.s. varchar data type

  - by George2

  Hello everyone, I have variable length character and want to store in SQL Server (2005) database. I want to learn some best practices about how to choose TEXT SQL type or choose VARCHAR SQL type, pros and cons in performance/footprint/function. thanks in advance, George

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• Using Predicate of a class to Search Generic list - Faster than looping?

  - by Srikanth

  Lets say we have a generic list of Class1, typically having ~100 objects for a given session. I would like to see if the list has a particular object. ASP.NET 2.0 allows me to do this: Dim objResult as Class1 = objList.Find(objSearch) How does this approach rate when compared to a traditional For loop, looking at a performance perspective? How would this vary with increase or decrease in length of the list?

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• Is there a way to detect inactive time of a user in a website? (Idle time)

  - by masoud ramezani

  This is my approach : I reserve last time that a user post a postback to server in a session and in every postback subtract this value from current value. Is there a better way for this? I think that my approach haven't a good performance.

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• C++ - Difference between (*). and -> ?

  - by Rachel

  Is there any difference in performance - or otherwise - between: ptr->a(); and (*ptr).a(); ?

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• Are compilers smart enough to detect a no-op function?

  - by 0x80

  If I write a function like this: void doMaybeNothing() { #ifndef IM_LAZY doSomething(); #endif } Are modern compilers smart enough to detect a no-op function and optimize so that there are no cycles wasted? Or is there always a small performance impact?

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• What is the difference between is_a and instanceof?

  - by Daniel L

  I am aware that instanceof is an operator and that is_a is a method. Is the method slower in performance? What would you prefer to use?

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• Profiling With Visual Studio Team System

  - by Rotem

  Hi, I'm using Visual Studio Team System 2008 to run Load Tests. I have a test that executes a web service request and I would like to know how much time was spent in each layer of my application e.g. Time spent in IIS, Time spent in my Server application Time spent in SQL Server Can I get this sort of information by setting the performance counters in my load test properly? Thanks

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• How to prevent image view loading while scrollong in iphone?

  - by Warrior

  I am new to iphone development.i want to check whether the image is loaded in the image view and if the image view is nil then load the image.i want to implement this in cell for row at index path so that i can increase the scrolling performance of the table , How can i do that ? please help me out.Thanks.

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• is it that easy working with ADO.NET Entity framework in real programming?

  - by sam

  HI Guys, I was watching these videos series about Entity Framework: http://msdn.microsoft.com/en-us/data/ff191186.aspx is that easy building application in real world programming??? and is it ....reliable...has good performance... "I am a graduate.." thanks

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