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  • When does code bloat start having a noticeable effect on performance?

    - by Kyle
    I am looking to make a hefty shift towards templates in one of my OpenGL projects, mainly for fun and the learning experience. I plan on watching the size of the executable carefully as I do this, to see just how much of the notorious bloat happens. Currently, the size of my Release build is around 580 KB when I favor speed and 440 KB when I favor size. Yes, it's a tiny project, and in fact even if my executable bloats 10 x its size, it's still going to be 5 MB or so, which hardly seems large by today's standards... or is it? This brings me to my question. Is speed proportional to size, or are there leaps and plateaus at certain thresholds, thresholds which I should be aiming to stay below? (And if so, what are the thresholds specifically?)

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  • Threadpool with pasistant worker instances

    - by Matt Smokey-waters Holmes
    So basically what im trying to do is queue up tasks in a thread pool to be executed as soon as a worker becomes free, i have found various examples of this but in all cases the examples have been setup to use a new Worker instance for each job, i want persistent workers. Im trying to make a ftp backup tool, i have it working but because of the limitations of a single connection it is slow. What i ideally want to do is have a single connection for scanning directories and building up a file list then four workers to download said files. Here is an example of my worker /** * FTP Worker */ public class Worker implements Runnable { protected FTPClient _ftp; // Connection details protected String _host = ""; protected String _user = ""; protected String _pass = ""; // worker status protected boolean _working = false; public Worker(String host, String user, String pass) { this._host = host; this._user = user; this._pass = pass; } // Check if the worker is in use public boolean inUse() { return this._working; } @Override public void run() { this._ftp = new FTPClient(); this._connect(); } // Download a file from the ftp server public boolean download(String base, String path, String file) { this._working = true; boolean outcome = true; //create directory if not exists File pathDir = new File(base + path); if (!pathDir.exists()) { pathDir.mkdirs(); } //download file try { OutputStream output = new FileOutputStream(base + path + file); this._ftp.retrieveFile(file, output); output.close(); } catch (Exception e) { outcome = false; } finally { this._working = false; return outcome; } } // Connect to the server protected boolean _connect() { try { this._ftp.connect(this._host); this._ftp.login(this._user, this._pass); } catch (Exception e) { return false; } return this._ftp.isConnected(); } // Disconnect from the server protected void _disconnect() { try { this._ftp.disconnect(); } catch (Exception e) { /* do nothing */ } } } and basically i want to be able to call Worker.download(...) for each task in a queue whenever a worker becomes available without having to create a new connection to the ftp server for each download Any help would be appreciated as iv'e never used threads before and I'm going round in circles at the moment

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  • How to copy one Stream to a byte array with the smallest C# code?

    - by estourodepilha.com
    Until now I am counting 12 LoCs. Could you make it smaller? using (Stream fileStream = File.OpenRead(fileName)) { using (BinaryReader binaryReader = new BinaryReader(fileStream)) { using (MemoryStream memoryStream = new MemoryStream()) { byte[] buffer = new byte[256]; int count; int totalBytes = 0; while ((count = binaryReader.Read(buffer, 0, 256)) > 0) { memoryStream.Write(buffer, 0, count); totalBytes += count; } memoryStream.Position = 0; byte[] transparentPng = new byte[totalBytes]; memoryStream.Read(transparentPng, 0, totalBytes); } } }

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  • Why does the roll_out event fire in this code?

    - by user339681
    I have made this simple example to demonstrate some problems I'm having. <?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"> <mx:Canvas id="buttonCanvas" x="100" y="100" opaqueBackground="#000000" width="80%" height="300" creationComplete="init(event)"> <mx:Button x="5" y="5"/> <mx:Button x="5" y="50"/> </mx:Canvas> <mx:Script> <![CDATA[ private function init(event:Event):void{ buttonCanvas.addEventListener(MouseEvent.ROLL_OUT, function(event:Event):void{ buttonCanvas.opaqueBackground=(buttonCanvas.opaqueBackground==0)? 0x666666:0; }); } ]]> </mx:Script> </mx:Application> I don't understand the following: Why doesn't the percentage nor absolute dimensions affect the canvas? Why does the roll_out event fire when the mouse leaves a button (even when it is still inside the canvas). I'm going nuts trying to figure this out. Any help would be greatly appreciated!

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  • Is it possible to add .NET code (sections) to a WordPress site?

    - by Jason
    Our shop is primarily .NET but because of the lack of any really good popular .NET CMS products, we have chosen to use WordPress (and Drupal at times) for our public facing sites. I realize this is highly subjective, but it is the conclusion we came to for our purposes. One could certainly make a case for DotNetNuke and others, but that is another conversation. I would like to know if I can integrate small components into WordPress sites, primarily to do simple forms (logon, lost password, contact us, change user settings, etc...) Can I do this with an iFrame or another method that I am not thinking about?

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  • Can I make a pointer to the code, and pass to the next instruction?

    - by drigoSkalWalker
    Like this link http://gcc.gnu.org/onlinedocs/gcc-3.3.1/gcc/Labels-as-Values.html I can get the memory address of an label, so if I declare a label, get your address, and add your address, i will pass to next instruction? some ilustration int main () { void *ptr; label: instruction 1; instruction 2; ptr = &&label; // So if I do it... ptr = ptr + 1; // I will get the instruction 2 correct?? Thanks for all answers.

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  • SQL Server 2005: Rename DB Server Instance Name?

    - by Code Sherpa
    Hi, Can somebody tell me how to rename the DB server instance name and a DB name in SQL Server 2005? Right Now I Have SERVER/OLDNAME -- oldnameDB I want to change the server instance and also change the db name. I have tried: EXEC sp_renamedb 'oldName', 'newName' and that has changed the dbname as it appers in the tree directory. But, when I do "select @@servername" it is the old name. Also, the MDF and LDF files are still the old name. How do change instance and db names as a clean sweep across the server? Thanks.

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  • Help me convert C# 1.1 Xml validation code to C# 2.0 please.

    - by Hamish Grubijan
    It would be fantastic if you could help me rid of these warnings below. I have not been able to find a good document. Since the warnings are concentrated in just the private void ValidateConfiguration( XmlNode section ) section, hopefully this is not terribly hard to answer, if you have encountered this before. Thanks! 'System.Configuration.ConfigurationException.ConfigurationException(string)' is obsolete: 'This class is obsolete, to create a new exception create a System.Configuration!System.Configuration.ConfigurationErrorsException' 'System.Xml.XmlValidatingReader' is obsolete: 'Use XmlReader created by XmlReader.Create() method using appropriate XmlReaderSettings instead. http://go.microsoft.com/fwlink/?linkid=14202' private void ValidateConfiguration( XmlNode section ) { // throw if there is no configuration node. if( null == section ) { throw new ConfigurationException("The configuration section passed within the ... class was null ... there must be a configuration file defined.", section ); } //Validate the document using a schema XmlValidatingReader vreader = new XmlValidatingReader( new XmlTextReader( new StringReader( section.OuterXml ) ) ); // open stream on Resources; the XSD is set as an "embedded resource" so Resource can open a stream on it using (Stream xsdFile = XYZ.GetStream("ABC.xsd")) using (StreamReader sr = new StreamReader(xsdFile)) { vreader.ValidationEventHandler += new ValidationEventHandler(ValidationCallBack); vreader.Schemas.Add(XmlSchema.Read(new XmlTextReader(sr), null)); vreader.ValidationType = ValidationType.Schema; // Validate the document while (vreader.Read()) { } if (!_isValidDocument) { _schemaErrors = _sb.ToString(); throw new ConfigurationException("XML Document not valid"); } } } // Does not cause warnings. private void ValidationCallBack( object sender, ValidationEventArgs args ) { // check what KIND of problem the schema validation reader has; // on FX 1.0, it gives a warning for "<xs:any...skip" sections. Don't worry about those, only set validation false // for real errors if( args.Severity == XmlSeverityType.Error ) { _isValidDocument = false; _sb.Append( args.Message + Environment.NewLine ); } }

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  • Sorting XML file by attribute

    - by LibraRocks
    Hi, I have a following XML code: <Group> <GElement code="x"> <Group> <GElement code="x"> <fname>a</fname> <lname>b</lname> </GElement> <GElement code ="f"> <fname>fa</fname> </GElement> </Group> </GElement> <GElement code ="f"> </GElement> </Group> I would like to have the output sorted by "code" like: <Group> <GElement code ="f"> </GElement> <GElement code="x"> <Group> <GElement code ="f"> <fname>fa</fname> </GElement> <GElement code="x"> <fname>a</fname> <lname>b</lname> </GElement> </Group> </GElement> </Group> The depth of the tree can be endless i.e. the GElement can have another Group and so on. Any ideas?

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  • How to understand the functional programming code for converting IP string to a number?

    - by zfz
    In a python discusion, I saw a way to convert IP string to a integer in functional progamming way. Here is the Link . The function is implemented in a single line. def ipnumber(ip): return reduce(lambda sum, chunk: sum <<8 | chunk, map(int, ip.split("."))) However, I have few ideas of funcional programming. Could anybody explain the function in detail? I've some knowledg of "map" and "reduce". But I don't konw what "|" and "chunk" mean here? Thanks.

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  • how to handle redirect from http response in c# code ?

    - by dotnetcoder
    I have a http request call that return a url . If I run this url in IE it returns a page that redirects to a another page and downloads the excel file. How can I abstract this whole process in a c# Api tha will deal with http request + response + redirect + file_downlaod in a method and evetually return the file or the file stream. thanks for the help.

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  • Does this code depend on string interning to work?

    - by Nick Gotch
    I'm creating a key for a dictionary which is a structure of two strings. When I test this method in a console app, it works, but I'm not sure if the only reason it works is because the strings are being interned and therefore have the same references. Foo foo1 = new Foo(); Foo foo2 = new Foo(); foo1.Key1 = "abc"; foo2.Key1 = "abc"; foo1.Key2 = "def"; foo2.Key2 = "def"; Dictionary<Foo, string> bar = new Dictionary<Foo, string>(); bar.Add(foo1, "found"); if(bar.ContainsKey(foo2)) System.Console.WriteLine("This works."); else System.Console.WriteLine("Does not work"); The struct is simply: public struct Foo { public string Key1; public string Key2; } Are there any cases which would cause this to fail or am I good to rely on this as a unique key?

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  • How to retain a row which is foreign key in another table and remove other duplicate rows?

    - by Mithril
    I have two table: A: id code 1 A1 2 A1 3 B1 4 B1 5 C1 6 C1 ===================== B: id Aid 1 1 2 4 (B doesn't contain the Aid which link to code C1) Let me explain the overall flow: I want to make each row in table A have different code(by delete duplicate),and I want to retain the Aid which I can find in table B.If Aid which not be saved in table B,I retain the id bigger one. so I can not just do something as below: DELETE FROM A WHERE id NOT IN (SELECT MAX(id) FROM A GROUP BY code, ) I can get each duplicate_code_groups by below sql statement: SELECT code FROM A GROUP BY code HAVING COUNT(*) > 1 Is there some code in sql like for (var ids in duplicate_code_groups){ for (var id in ids) { if (id in B){ return id } } return max(ids) } and put the return id into a idtable?? I just don't know how to write such code in sql. then I can do DELETE FROM A WHERE id NOT IN idtable

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  • Why wont this simple code work all of a sudden?

    - by eric
    Why wont this print "success" when i submit the form?!?! Im pretty sure it should work. <?php if (count($_POST) > 0) { echo "success!!"; } ?> <form method="post" enctype="multipart/form-data"> <input type="file" name="userfile" /> <input type="submit" value="upload" /> </form>

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  • What makes my code DDD (domain-driven design) qualified?

    - by oykuo
    Hi All, I'm new to DDD and am thinking about using this design technique in my project. However, what strikes me about DDD is that how basic the idea is. Unlike other design techniques such as MVC and TDD, it doesn't seems to contain any ground breaking ideas. For example, I'm sure some of you will have the same feeling that the idea of root aggregates and repositories are nothing new because when you are was writing MVC web applications you have to have one single master object (i.e. the root aggregate) that contain other minor objects (i.e. value objects and entities) in the model layer in order to send data to a strongly typed view. To me, the only new idea in DDD is probably the "Smart" entities (i.e. you are supposed to have business rules on root aggregates) Separation between value object, root aggregate and entities. Can anyone tell me if I have missed out anything here? If that's all there is to DDD, if I update one of my existing MVC application with the above 2 new ideas, can I claim it's an TDD, MVC and DDD applcation?

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  • Need help optimizing this Django aggregate query

    - by Chris Lawlor
    I have the following model class Plugin(models.Model): name = models.CharField(max_length=50) # more fields which represents a plugin that can be downloaded from my site. To track downloads, I have class Download(models.Model): plugin = models.ForiegnKey(Plugin) timestamp = models.DateTimeField(auto_now=True) So to build a view showing plugins sorted by downloads, I have the following query: # pbd is plugins by download - commented here to prevent scrolling pbd = Plugin.objects.annotate(dl_total=Count('download')).order_by('-dl_total') Which works, but is very slow. With only 1,000 plugins, the avg. response is 3.6 - 3.9 seconds (devserver with local PostgreSQL db), where a similar view with a much simpler query (sorting by plugin release date) takes 160 ms or so. I'm looking for suggestions on how to optimize this query. I'd really prefer that the query return Plugin objects (as opposed to using values) since I'm sharing the same template for the other views (Plugins by rating, Plugins by release date, etc.), so the template is expecting Plugin objects - plus I'm not sure how I would get things like the absolute_url without a reference to the plugin object. Or, is my whole approach doomed to failure? Is there a better way to track downloads? I ultimately want to provide users some nice download statistics for the plugins they've uploaded - like downloads per day/week/month. Will I have to calculate and cache Downloads at some point? EDIT: In my test dataset, there are somewhere between 10-20 Download instances per Plugin - in production I expect this number would be much higher for many of the plugins.

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