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• NHibernate - Stream large result sets?

  - by Dan Black

  Hi, I have to read in a large record set, process it, then write it out to a flat file. The large result set comes from a Stored Proc in SQL 2000. I currently have: var results = session.CreateSQLQuery("exec usp_SalesExtract").List(); I would like to be able to read the result set row by row, to reduce the memory foot print Thanks

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• Producer / Consumer - I/O Disk

  - by Pedro Magalhaes

  Hi, I have a compressed file in the disk, that a partitioned in blocks. I read a block from disk decompress it to memory and the read the data. It is possible to create a producer/consumer, one thread that recovers compacted blocks from disk and put in a queue and another thread that decompress and read the data? Will the performance be better? Thanks!

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• Getting A File's Mime Type In Java

  - by Lee Theobald

  I was just wondering how most people fetch a mime type from a file in Java? So far I've tried two utils: JMimeMagic & Mime-Util. The first gave me memory exceptions, the second doesn't close its streams off properly. I was just wondering if anyone else had a method/library that they used and worked correctly?

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• Are there any drawbacks to using helper :all in Rails

  - by Rob Jones

  In Rails 'helper :all' makes all your helpers 'available' to all your controllers. This is concise and convenient, but does it have any memory and/or performance implications compared to explicitly calling the helpers that each controller actually needs? It's unclear form the docs whether using it involves 'require'ing all those files, or whether autoload is being used. I can't tell from the source in the Rails framework docs. thanks

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• version control on large files

  - by Dustin Getz

  We happily use SVN for SCM at work. Currently I've got our binary assets in the same SVN repository as our code. SVN supports very large files (it transmits them 'streamily' to keep memory usage sane), but it is SLOOWWWWW. What asset management software do you recommend, for about a GB (and growing) worth of assets? We would prefer branching and merging (different assets & config files go to different customers).

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• Best Practice for Utilities Class?

  - by Sonny Boy

  Hey all, We currently have a utilities class that handles a lot of string formatting, date displays, and similar functionality and it's a shared/static class. Is this the "correct" way of doing things or should we be instanciating the utility class as and when we need it? Our main goal here is to reduce memory footprint but performance of the application is also a consideration. Thanks, Matt PS. We're using .NET 2.0

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• Max file size for File.ReadAllLines

  - by user283897

  Hi, I need to read and process a text file. My processing would be easier if I could use the File.ReadAllLines method but I'm not sure what is the maximum size of the file that could be read with this method without reading by chunks. I understand that the file size depends on the computer memory. But are still there any recommendations for an average machine? I would greatly appreciate your fast response. Thanks, Lev

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• how to make Sliding window model for data stream mining?

  - by zeedotcom

  we have a situation that a stream (data from sensor or click stream data at server) is coming with sliding window algorithm we have to store the last (say) 500 samples of data in memory. These samples are then used to create histograms, aggregations & capture information about anomalies in the input data stream. please tell me how to make such sliding window.

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• How do Relational Databases Work Under the Hood?

  - by Pierreten

  I've always been interested in how you can throw some SQL at at database, and it nearly instantaneously returns your results in an orderly manner without thinking about it as anything other than a black box. What is really going on? I'm pretty sure it has something to do with how values are laid out regularly in memory, similar to an array; but aside from that, I don't know much else. How is SQL parsed in a manner to facilitate all of this?

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• Add centered text to the middle of a <hr/>-like line

  - by Brian M. Hunt

  I'm wondering what options one has in xhtml 1.0 strict to create a line on both sides of text like-so: Section one ----------------------- Next section ----------------------- Section two I've thought of doing some fancy things like this: <div style="float:left; width: 44%;"><hr/></div> <div style="float:right; width: 44%;"><hr/></div> Next section Or alternatively, because the above has problems with alignment (both vertical and horizontal): <table><tr> <td style="width:47%"><hr/></td> <td style="vertical-align:middle; text-align: center">Next section</td> <td style="width:47%"><hr/></td> </tr></table> However both options feel 'fudgy', and I'd be much obliged if you happened to have seen this before and know of an elegant solution. Thank you for reading. Brian

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• 8GB Compact Flash Corrupted, Boot Sector Lost ?

  - by robert

  I have an 8GB Kingston compact Flash, and when I insert it into my mac it says that card is unredable and ask me for initialization. If i open Utilty Disk it show a card of 2,2 TB Generic Comact Flash, if I try to initialize that it give me error: POSIX reports: impossible to allocate memory. How i can format that ? There's a way with fdisk or smt to get this card work ? Thanks

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• What are the Ruby equivalent of Python itertools, esp. combinations/permutations/groupby?

  - by Amadeus

  Python's itertools module provides a lots of goodies with respect to processing an iterable/iterator by use of generators. For example, permutations(range(3)) --> 012 021 102 120 201 210 combinations('ABCD', 2) --> AB AC AD BC BD CD [list(g) for k, g in groupby('AAAABBBCCD')] --> AAAA BBB CC D What are the equivalent in Ruby? By equivalent, I mean fast and memory efficient (Python's itertools module is written in C).

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• Convert large raster graphics image(bitmap, PNG, JPEG, etc) to non-vector postscript in C#

  - by Dennis Cheung

  How to convert an large image and embed it into postscript? I used to convert the bitmap into HEX codes and render with colorimage. It works for small icons but I hit a /limitcheck error in ghostscript when I try to embed little larger images. It seem there is a memory limit for bitmap in ghostscript. I am looking a solution which can run without 3rd party/pre-processing other then ghostscript itself.

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• Most useful autohotkey standard library scripts

  - by Naveen

  Which 3rd party scripts have you frequently #included in your scripts. They may or may not be [stdlib] compatible. List 1 script per post so standard sf voting can be used to rank / rate scripts associated with your post as well. Here is a list to jog your memory.

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• What's the fastest way to determine if a file adheres to a particular class's NSCoding implementatio

  - by Justin Searls

  Given: An application that accesses a directory of files: some plain text, some binary files that adhere to a particular NSCoding implementation, and perhaps other binary files it simply doesn't understand how to process. I want to be able to figure out which of the files in that directory adhere to my NSCoding class, and I'd prefer not to have to fall back on the naïve approach of loading the entirety of each file into memory, attempting to unarchive each. Anyone have an elegant approach or pattern to this problem?

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• How do I tell Castle Inversion of Control that I want a new instance of a singleton object without r

  - by Corpsekicker

  At a certain point, during the running of my app, I want Castle.Windsor to release everything cached in memory. Is this impossible for a singleton object?

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• Efficiency questions

  - by rayman

  Hi, I have to manage XML documents and Strings in my app. In terms of efficiency and memory usage, will a collection like ArrayList be much more expensive than String[]? Also, I could store the content as a regular String or XML. Is working with XML also more expensive? (When I say expensive, I am referring to the use of system resources.) If there are differences, are they significant? Thanks, Ray.

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• Lookup element by id within a DIV not injected in DOM

  - by Rajat

  I have a DOM element in memory that is yet to be injected in the page DOM. I want to lookup an element by id inside this DOM element but document.getElementById wont work as the element is not yet in the page DOM. Any ideas on how to do this?

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• Java, HashMaps and using Strings as the keys - does the string value get stored twice?

  - by MalcomTucker

  If I have a HashMap that looks like this: HashMap<String, MyObject> where the String key is a field in MyObject, does this string value get stored twice? So when I add entries: _myMap.put(myObj.getName(), myObj); Am I using double the String size in terms of memory? Or does Java do something clever behind the scenes? Thanks

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• HCI - How to evaluate a device to the relation with these theories such as: "senses (Visual, Auditor

  - by Mr blue

  How can to evaluate a computerized device or a software application in the HCI field to the relation with these theories such as: "Senses (Visual, Auditory, Haptic) and cognition (short term and long term memory)" and based on the context where the device is used? Any help or advice is appreciated. Thanks

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• How do you performance test JavaScript code?

  - by danmine

  CPU Cycles, Memory Usage, Execution Time, etc.? Added: Is there a quantitative way of testing performance in JavaScript besides just perception of how fast the code runs?

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• Explicit disable MySQL query cache in some parts of program

  - by jack

  In a Django project, some cronjob programs are mainly used for administrative or analysis purposes, e.g. generating site usage stats, rotating user activities log, etc. We probably do not hope MySQL to cache queries in those programs to save memory usage and improve query cache efficiency. Is it possible to turn off MySQL query cache explicitly in those programs while keep it enabled for other parts including all views.py?

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• Char* vs std::string

  - by Lockyer

  Is there any advantage to using char*'s instead of std::string? I know char*'s are usually defined on the stack, so we know exactly how much memory we'll use, is this actually a good argument for their use? Or is std::string better in every way?

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• Event sourcing: Write event before or after updating the model

  - by Magnus

  I'm reasoning about event sourcing and often I arrive at a chicken and egg problem. Would be grateful for some hints on how to reason around this. If I execute all I/O-bound processing async (ie writing to the event log) then how do I handle, or sometimes even detect, failures? I'm using Akka Actors so processing is sequential for each event/message. I do not have any database at this time, instead I would persist all the events in an event log and then keep an aggregated state of all the events in a model stored in memory. Queries are all against this model, you can consider it to be a cache. Example Creating a new user: Validate that the user does not exist in model Persist event to journal Update model (in memory) If step 3 breaks I still have persisted my event so I can replay it at a later date. If step 2 breaks I can handle that as well gracefully. This is fine, but since step 2 is I/O-bound I figured that I should do I/O in a separate actor to free up the first actor for queries: Updating a user while allowing queries (A0 = Front end/GUI actor, A1 = Processor Actor, A2 = IO-actor, E = event bus). (A0-E-A1) Event is published to update user 'U1'. Validate that the user 'U1' exists in model (A1-A2) Persist event to journal (separate actor) (A0-E-A1-A0) Query for user 'U1' profile (A2-A1) Event is now persisted continue to update model (A0-E-A1-A0) Query for user 'U1' profile (now returns fresh data) This is appealing since queries can be processed while I/O-is churning along at it's own pace. But now I can cause myself all kinds of problems where I could have two incompatible commands (delete and then update) be persisted to the event log and crash on me when replayed up at a later date, since I do the validation before persisting the event and then update the model. My aim is to have a simple reasoning around my model (since Actor processes messages sequentially single threaded) but not be waiting for I/O-bound updates when Querying. I get the feeling I'm modeling a database which in itself is might be a problem. If things are unclear please write a comment.

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• Java Garbage Collection

  - by pietervn

  I was wondering about the garbage collection that takes place in Java. Is it really able to handle all objects that aren't used and free up the most possible memory? I also want to know how does the Java garbage collection compare to another language like lets say C#? And then, how does the automatic garbage collection measure up against manual collection from a language like C?

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