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• Toggle jQuery-UI widgets

  - by cf_PhillipSenn

  I have: <div class="ui-widget"> <div class="ui-widget-header"> <span class="ui-icon ui-icon-circle-triangle-n">My Menu</span> </div> <ul class="ui-widget-content"> <li>Menu Item 1</li> <li>Menu Item 2</li> <li>Menu Item 3</li> </ul> </div> My jQuery is: $('.ui-widget-header').click(function() { $('.ui-widget-header+ul').toggle('slow'); }); Q: How do I toggle classes between ui-icon-circle-triangle-n and ui-icon-circle-triangle-s as the user clicks on .ui-widget-header?

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• Jquery dialog box - doesn't fade out before closing

  - by Broken Link

  I have div(box) on my page and I'm using this script to display div as dialog box. Inside that div I have a hyper link, On click of the hyper link I want to fade out the dialog box and close.. The content of the dialog fades out, but the border of the dialog box remains same. If I add $("#box").dialog('close') to the click function after fadeto there is no effect.. it just closes the dialog box completely. Any help? using jquery-ui-1.7.2 <script type="text/javascript"> $(document).ready(function(){ $("a#later").click(function () { $("#box").fadeTo('slow', 0); }) }); $(function () { $("#box").dialog({ autoOpen: true, width: 500, modal: true, }); }); </script>

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• Cache an FTP connection via session variables for use via AJAX?

  - by Chad Johnson

  I'm working on a Ruby web Application that uses the Net::FTP library. One part of it allows users to interact with an FTP site via AJAX. When the user does something, and AJAX call is made, and then Ruby reconnects to the FTP server, performs an action, and outputs information. Every time the AJAX call is made, Ruby has to reconnect to the FTP server, and that's slow. Is there a way I could cache this FTP connection? I've tried caching in the session hash, but "We're sorry, but something went wrong" is displayed, and a TCP dump is outputted in my logs whenever I attempt to store it in the session hash. I haven't tried memcache yet. Any suggestions?

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• Advantages of using WCF to work with Sharepoint Services WSS3.0?

  - by val

  Hi folks, what is your opinion or better off your practical experience using WCF to work with WSS instead of SP web services? I am writing some custom library for our software to store and retrieve files from WSS document libraries using sharepoint web services. I am not entirely happy with the performance of the sp web services - a bit too slow in many cases. Now, microsoft claims a significant improvements in WCF over remoting and I am looking into a good way to use WCF for my file services. Any suggestions or ideas? Maybe a good source of coding practices or blogs? Thanks a lot, Val

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• Horizontally Flip a One Bit Bitmap Line

  - by roygbiv

  I'm looking for an algorithm to flip a 1 Bit Bitmap line horizontally. Remember these lines are DWORD aligned! I'm currently unencoding an RLE stream to an 8 bit-per-pixel buffer, then re-encoding to a 1 bit line, however, I would like to try and keep it all in the 1 bit space in an effort to increase its speed. Profiling indicates this portion of the program to be relatively slow compared to the rest. Example line (Before Flip): FF FF FF FF 77 AE F0 00 Example line (After Flip): F7 5E EF FF FF FF F0 00

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• iPhone UIImage number recognition

  - by Skeep

  Hi All, I have a small UIImage (jpg) with a single typed number. I want to be able to read the number with some kind of pattern recognition. I'm really not sure where to start, so any help would be appreciated. my initial idea was to compare this image with other images. For instance compare the image with that of a 1,2,3, etc until a match was found. That just seems slow and cumbersome and wondered if there was a better way to do it? Thanks

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• Statistics Question: Kernel Smoothing in R

  - by James Thompson

  I have data of this form: x y 1 0.19 2 0.26 3 0.40 4 0.58 5 0.59 6 1.24 7 0.68 8 0.60 9 1.12 10 0.80 11 1.20 12 1.17 13 0.39 I'm currently plotting a kernel-smoothed density estimate of the x versus y using this code: smoothed = ksmooth( d$resi, d$score, bandwidth = 6 ) plot( smoothed ) I simply want a plot of the x versus smoothed(y) values, which is ## Heading ## However, the documentation for ksmooth suggests that this isn't the best kernel-smoothing package available: This function is implemented purely for compatibility with S, although it is nowhere near as slow as the S function. Better kernel smoothers are available in other packages. What other kernel smoothers are better can these smoothers be found?

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• Maximum number of files in one ext3 directory while still getting acceptable performance?

  - by knorv

  I have an application writing to an ext3 directory which over time has grown to roughly three million files. Needless to say, reading the file listing of this directory is unbearably slow. I don't blame ext3. The proper solution would have been to let the application code write to sub-directories such as ./a/b/c/abc.ext rather than using only ./abc.ext. I'm changing to such a sub-directory structure and my question is simply: roughly how many files should I expect to store in one ext3 directory while still getting acceptable performance? What's your experience? Or in other words; assuming that I need to store three million files in the structure, how many levels deep should the ./a/b/c/abc.ext structure be? Obviously this is a question that cannot be answered exactly, but I'm looking for a ball park estimate.

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• In a Linux user space process what is the address of the vsyscall page?

  - by TomMD

  I would like to acquire the address of the vsyscall page for my own uses. I only have two ideas here: alter the compiler to store this information in some known location after it is given to __start, or read /proc/[pid]/maps. I really don't want to read /proc/ as that is slow and shouldn't be necessary. I also don't want to make compiler modifications. Does anyone have an alternative? Is there a symbol I should know about? Its at the point I'm tempted to stuff this functionality into an ioctl call in a module I've developed as part of this work!

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• how to re-factor a web site for 3G?

  - by George2

  Hello everyone, I have a traditional web site which serves users from desktop computer browsers. I am using Microsoft technologies, like ASP.Net, C#, .Net, SQL Server 2008, IIS and Windows Server 2008. Nowadays, more and more users are using 3G mobile phones, and I am wondering from software perspective, how to add new features to my web site (do I need a client application runs on mobile phone as well?) so that 3G users could have good user experience or new kinds of 3G specific applications? Any recommended documents or real samples are welcome. For 3G users, I want to distinguish from traditional less-powered and slow network access GPRS mobile phone. thanks in advance, George

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• Alternatives to UIWebView for rich content?

  - by ojreadmore

  In my app, I am displaying 4 "tabs", each are local content through a UIWebView. I create HTML markup from my simple data. This is slow to load and I'm trying to speed it up. I'm using UIWebView to accomplish these: 1. hyperlinks 2. some styling - font colors 3. HTML tables Writing my own class to handle this is okay for (1.) hyperlinks - I can use a touch event to call a method. And (2.) styling - I can use UILables to do basic formatting, no biggie here. BUT what I really love about the UIWebViews is the (3.) HTML tables! I find it troublesome to line up the UILabels in a way that mimics HTML Tables, for instance, one cell's height in a row changes the height of all cells. I'm looking for another perspective or knowledge of an alternative.

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• jQuery create new div with ID?

  - by John

  Hello, I have form in my ASP.NET masterPage.master and if i click on submit it call some method from masterPage.master.cs file by ajax (i have it in update panel). But i want improve it with jQuery. So i have this: $('#submit').click(function () { $.ajax({ type: "POST", url: '<% Response.Write("~"+Request.Path); %>', beforeSend: function () { $(document.createElement('div')).width($('#formBox').width()) .height($('#formBox').height()) .css({ backgroundImage: 'url(/Static/Img/bc_overlay.png)', position: 'absolute', left: 0, top: 0, margin: "5px", textAlign: "center", color: "#000", display: "none" }) .append("<strong>Nacítám</strong><br /><img src='Static/Img/ajax-loader.gif' width='33px' height='33px' alt='loading' />") .fadeIn("slow") .prependTo($('#formBox')); $('#formBox').css('position', 'relative'); }, success: function () { } }); }); So if i click on submit, new div is creating (there is loading text and image, and cool opacity overlay), but how i give to this div some ID? Because i need use it in success: function () { } i need clear this box and write here some text (error or success).

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• group_concat on an empty join in MySQL

  - by Yossarian

  Hello, I've got the following problem: I have two tables: (simplified) +--------+ +-----------+ | User | | Role | +--------+ +-----------+ | ID<PK> | | ID <PK> | +--------+ | Name | +-----------+ and M:N relationship between them +-------------+ | User_Role | +-------------+ | User<FK> | | Role<FK> | +-------------+ I need to create a view, which selects me: User, and in one column, all of his Roles (this is done by group_concat). I've tried following: SELECT u.*, group_concat(r.Name separator ',') as Roles FROM User u LEFT JOIN User_Role ur ON ur.User=u.ID LEFT JOIN Role r ON ur.Role=r.ID GROUP BY u.ID; However, this works for an user with some defined roles. Users without role aren't returned. How can I modify the statement, to return me User with empty string in Roles column when User doesn't have any Role? Explanation: I'm passing the SQL data directly to a grid, which then formats itself, and it is easier for me to create slow and complicated view, than to format it in my code. I'm using MySQL

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• Relational databases are not suited for my application - what's the alternative?

  - by waitinforatrain

  Hi, I'm writing a CMS in PHP that allows the user to define different fields (e.g. a Blog page could have fields for Title (string), Content (rich text), Picture (file)). I need the user to be able to add and remove fields dynamically, and the only way I can think of to do it with relational DBs is to serialise all these values and store them in one cell. This seems like a slow approach and like I'm trying to fit something dynamic within a static structure. Could someone recommend anything that is PHP-compatible that would make this easier?

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• How to track IIS server performance

  - by Chris Brandsma

  I have a reoccurring issue where a customer calls up and complains that the web site is too slow. Specifically, if they are inactive for a short period of time, then go back to the site, there will be a minute-two minute delay before the user sees a response. (the standard browser is Firefox in this case) I have Perfmon up and running, the cpu utilization is usually below 20% (single proc...don't ask). The database is humming along. And I'm pulling my hair out. So, what metrics/tools do you find useful when evaluating IIS performance?

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• understanding memory mapping in directx

  - by numerical25

  So my question is ... " When your using the mapping feature to write into a memory buffer, are you really just saving the whole procedure into a queue so directX executes it when finished with other tasks???" I ask this question because this is my perception of mapping when writing to a buffer. I just want to make sure my perception is correct. I understand that the monitor moves extremely slow in compared to the processor, and I am sure the processor can execute 10 times the amount the screen can refresh. So is this one of the reason you should map when writing to a buffer. so each procedure can be done in a orderly fashion. If someone could elaborate, that would be great. thanks

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• What is faster: multiple `send`s or using buffering?

  - by dauerbaustelle

  I'm playing around with sockets in C/Python and I wonder what is the most efficient way to send headers from a Python dictionary to the client socket. My ideas: use a send call for every header. Pros: No memory allocation needed. Cons: many send calls -- probably error prone; error management should be rather complicated use a buffer. Pros: one send call, error checking a lot easier. Cons: Need a buffer :-) malloc/realloc should be rather slow and using a (too) big buffer to avoid realloc calls wastes memory. Any tips for me? Thanks :-)

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• C# Dynamic From Components (Performance problem)

  - by Svisstack

  Hello, I have a problem with performance of my code under Windows Forms. Have a form, her layout is depending on constructor data, because he layout must be OnLoad or in Constructor generated. I generation is simple, base FlowLayoutPanel have other FlowLayoutPanels, for each have a Label and TextBox with DataBinding. Problem is this is VERY SLOW, up to 20 seconds, i drawing less than 100 controls, from Performace Session i know a problem is on 70% procesing functions: System.Windows.Forms.Control.ControlCollection.Add(class System.Windows.Forms.Control) System.Windows.Forms.ControlBindingsCollection.Add(class System.Windows.Forms.Binding) How i can do with this? Anyone help me in this problem? How solve the dynamic form layout problem?

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• How to speed up dumping a DataTable into an Excel worksheet?

  - by AngryHacker

  I have the following routine that dumps a DataTable into an Excel worksheet. private void RenderDataTableOnXlSheet(DataTable dt, Excel.Worksheet xlWk, string [] columnNames, string [] fieldNames) { // render the column names (e.g. headers) for (int i = 0; i < columnNames.Length; i++) xlWk.Cells[1, i + 1] = columnNames[i]; // render the data for (int i = 0; i < fieldNames.Length; i++) { for (int j = 0; j < dt.Rows.Count; j++) { xlWk.Cells[j + 2, i + 1] = dt.Rows[j][fieldNames[i]].ToString(); } } } For whatever reason, dumping DataTable of 25 columns and 400 rows takes about 10-15 seconds on my relatively modern PC. Takes even longer testers' machines. Is there anything I can do to speed up this code? Or is interop just inherently slow?

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• How to handle images folder with many images

  - by Billy

  I'm developing a new aspnet website with 200k images in a /Images/ -folder. Many operations in Visual Studio is slow because it access the folder, adding a web service takes 10 minutes. The images is not checked into scm (svn). How should I structure the tree of code, to improve performance in VS? It would also be neat if not all developers needed to copy 200k images to their local disk to be able to develop on the site. Images as DB blobs is not an option.

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• how to Improve DrawDIB's quality?

  - by sxingfeng

  I am coding in c++, gdi I use stretchDIBits to draw Images to dc. ::SetStretchBltMode(hDC, HALFTONE); ::StretchDIBits( hDC, des.left,des.top,des.right - des.left,des.bottom - des.top, 0, 0, img.getWidth(), img.getHeight(), (img.accessPixels()), (img.getInfo()), DIB_RGB_COLORS, SRCCOPY ); However It is slow. So I changed to use DrawDib function. ::SetStretchBltMode(hDC, HALFTONE); DrawDibDraw( hdd, hDC, des.left,des.top,des.right - des.left,des.bottom - des.top, (LPBITMAPINFOHEADER)(img.getInfo()), (img.accessPixels()), 0, 0, img.getWidth(), img.getHeight(), DDF_HALFTONE ); However the result is just like draw by COLORONCOLOR Mode. How can I improve the drawing quality?

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• problem in showing utf8 letters in jquery

  - by Mac Taylor

  hey guys i made a jquery script similar to wordpress that can show slugged title from an input box while user is typing $(function() { $(".word").keyup(function() { var word= $(this).val(); var inputmirror = $('#plink'); inputmirror.val(word); $.post("slug.php"+"&title="+word, function(data){ $('#preshow').html(data).fadeIn("slow"); }); return false; }); }); and php file : $title = $_GET['title']; if (!empty($title)) { echo Slugit($title); } everything works fine unless when i enter arabic letters in input box it shows coded characters like this : http://mysite.info/this-is-arabic-%d8%a7%d9%84%d9%84%d9%87

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• Problem in serializing

  - by Harun

  Hello Guyz, Presently I need to serialize one of my object which contains more my own classes object. But the problem is I dont want to save it in a file and then retrieve it into memory stream. Is there any way to directly serialize my object into stream. I used BinaryFormatter for seializing. First I used a MemoryStream directly to take serialize output but it is giving error at time of deserialization. But later when I serialize it with a file then close it and again reopen it , it works perfectly. But I want to take it direct into stream because in my program I need to do it frequently to pass it into network client. And using file repeatedly might slow down my software. Hope I clear my problem. Any Sugetion ?

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• UITableView with contact image problems.

  - by prathumca

  As par my app requirement, I'm showing the contact images in a UITableView as shown below. ABRecordRef contact = [self getContact]; if(contact && ABPersonHasImageData(contact)) { UIImage *contactImage = [UIImage imageWithData:(NSData*)ABPersonCopyImageData(contact)]; callImage.image = contactImage; } I've two problems if I use the above code segment. Table Scrolling is too slow. If comment the above code, then UITable responds very fast. Memory Management. My app started using 25 - 30 MB of RAM. Is there any better way to avoid the above two problems?

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• openmp vs opencl for computer vision

  - by user1235711

  I am creating a computer vision application that detect objects via a web camera. I am currently focusing on the performance of the application My problem is in a part of the application that generates the XML cascade file using Haartraining file. This is very slow and takes about 6days . To get around this problem I decided to use multiprocessing, to minimize the total time to generate Haartraining XML file. I found two solutions: opencl and (openMp and openMPI ) . Now I'm confused about which one to use. I read that opencl is to use multiple cpu and GPU but on the same machine. Is that so? On the other hand OpenMP is for multi-processing and using openmpi we can use multiple CPUs over the network. But OpenMP has no GPU support. Can you please suggest the pros and cons of using either of the libraries.

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