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  • Rails initializes extremely slow on ruby 1.9.1

    - by Ben Johnson
    I just got my rails 2.3.8 app running on ruby 1.9.1. To get into the console, start the webserver, anything that initializes rails, takes 3 - 4 times longer in ruby 1.9 than in ruby 1.8.7. I'm using ruby version managers so I can easily switch between ruby 1.9 and ruby 1.8.7. The speed difference happens in both production and development. I want to use 1.9 because its must faster once everything is running, but the startup time is so bad the app is timing out on Heroku on the first request. Any ideas why ruby 1.9 would be 3 - 4 times slower? I can't figure it out for the life of me.

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  • Efficiently check string for one of several hundred possible suffixes

    - by Ghostrider
    I need to write a C/C++ function that would quickly check if string ends with one of ~1000 predefined suffixes. Specifically the string is a hostname and I need to check if it belongs to one of several hundred predefined second-level domains. This function will be called a lot so it needs to be written as efficiently as possible. Bitwise hacks etc anything goes as long as it turns out fast. Set of suffixes is predetermined at compile-time and doesn't change. I am thinking of either implementing a variation of Rabin-Karp or write a tool that would generate a function with nested ifs and switches that would be custom tailored to specific set of suffixes. Since the application in question is 64-bit to speed up comparisons I could store suffixes of up to 8 bytes in length as const sorted array and do binary search within it. Are there any other reasonable options?

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  • Javascript - why do I sometimes fail to read file content with GDownloadUrl?

    - by Daj pan spokój
    Hi everybody. I try to read some file with google's GDownloadUrl and it works only from time to time. failure means fileRows == "blah blah" success means fileRows == (real file content) I've noticed, however, that when I cease (with Firebug) the execution on line 3 for a couple of seconds, it succeeds more often. Maybe it is some kind of threading bug, then? Do You guys have any tip or idea? 1 var fileContent = "blah blah"; 2 availabilityFile = "input/available/" + date + ".csv"; 3 GDownloadUrl(availabilityFile, function(fileData) { 4 fileContent = fileData; 5 }); 6 fileRows = fileContent.split("\n");

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  • Asp.net Website Performance Improvement Checklist

    - by Jordon
    Hello Friends, I have asp.net website name http://www.go4sharepoint.com I have tried almost all ways to improve performance of this site, I have even check firebug and page speed addon on Firefox, but somehow i am not pleased with the result. I also tried like removing whitespace, remove viewstate, optimizing code which renders it, applied GZip, I have also no heavy session variables used, but still when i compare with other popular websites it is not upto the mark. I have check CodeProject website and was surprise that even though they have lot of stuff displayed there website is loading fast and they also have good loading rate. To all experts, Please suggest me where i am going wrong in my development. Thank you.

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  • Cufon delay in WordPress, Mac/Safari/FF...

    - by luke
    Using cufon 'manually' not the plugin.... I have a delay on many page loads in Safari and FF on the Cufon enabled headings.... http://www.budewebdesign.com/haf Tried moving Cufon higher up (eg before wp_head() and the plugin code that calls, without any real effect. Some pages no problem but others just a long enough delay to be annoying. I'm not really keen on hiding the headings before the page load completes as is suggested elsewhere. If it loads without delay some of the time, I wonder if it can be made to 'all' of the time :) My connection speed is good. Thanks for any ideas on this.

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  • Fastest sort of fixed length 6 int array

    - by kriss
    Answering to another StackOverflow question (this one) I stumbled upon an interresting sub-problem. What is the fastest way to sort an array of 6 ints ? As the question is very low level (will be executed by a GPU): we can't assume libraries are available (and the call itself has it's cost), only plain C to avoid emptying instruction pipeline (that has a very high cost) we should probably minimize branches, jumps, and every other kind of control flow breaking (like those hidden behind sequence points in && or ||). room is constrained and minimizing registers and memory use is an issue, ideally in place sort is probably best. Really this question is a kind of Golf where the goal is not to minimize source length but execution speed. I call it 'Zening` code as used in the title of the book Zen of Code optimization by Michael Abrash and it's sequels.

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  • C# Win Forms Thread Pool - Unresponsive UI

    - by Goober
    Scenario I have a Windows Form Application. Inside the main form there is a loop that iterates around 3000 times, Creating a new instance of a class on a new thread to perform some calculations. Baring in mind that this setup uses a Thread Pool, the UI does stay responsive when there are only around 100 iterations of this loop (100 Assets to process). But as soon as this number begins to increase heavily, the UI locks up into eggtimer mode and the thus the log that is writing out to the listbox on the form becomes unreadable. Question Am I right in thinking that the best way around this is to use a Background Worker? And is the UI locking up because even though I'm using lots of different threads (for speed), the UI itself is not on its own separate thread? Suggested Implementations greatly appreciated.

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  • (Oracle Performance) Will a query based on a view limit the view using the where clause?

    - by BestPractices
    In Oracle (10g), when I use a View (not Materialized View), does Oracle take into account the where clause when it executes the view? Let's say I have: MY_VIEW = SELECT * FROM PERSON P, ORDERS O WHERE P.P_ID = O.P_ID And I then execute the following: SELECT * FROM MY_VIEW WHERE MY_VIEW.P_ID = '1234' When this executes, does oracle first execute the query for the view and THEN filter it based on my where clause (where MY_VIEW.P_ID = '1234') or does it do this filtering as part of the execution of the view? If it does not do the latter, and P_ID had an index, would I also lose out on the indexing capability since Oracle would be executing my query against the view which doesn't have the index rather than the base table which has the index?

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  • Visual Studio 2008 built-in web server raises integrated pipeline error on Http Header manipulation

    - by jdk
    Using Visual Studio 2008, built-in web server. In a Web Handler .ashx file public void ProcessRequest(HttpContext context) { context.Response.ContentType = MimeType_text_xvcard; context.Response.Headers.Add(HttpHeader_ContentLength, "2138"); when I try to added a header I get the exception This operation requires IIS integrated pipeline mode. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.PlatformNotSupportedException: This operation requires IIS integrated pipeline mode. I can find information about this on the Internet but need specific info about how to work with Integrated Pipeline mode (presumably through web.config?) to allow HTTP headers to be manipulated. Note: I am using the Visual Studio built-in web server instead of full-fledged IIS

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  • convert server side vb.net to client side javascript

    - by rockinthesixstring
    I've got a function I wrote quite some time ago that works fine, but I'd like to speed up the process and lessen server load by doing the same job in Javascript. I seem to be able to GET textbox values ok, but I can't seem to SET textbox values (I'm'-a JS noob). Can anyone lend a hand in converting my VB.NET code to it's JS equivalent? Protected Sub txtSellingPrice_TextChanged(ByVal sender As Object, ByVal e As EventArgs) _ Handles txtSellingPrice.TextChanged Dim SellingPrice As Double = Double.Parse(txtSellingPrice.Text.Replace("$", "")) Dim BallanceSheet As Double = If(txtBalanceSheet.Text = "", 0, Double.Parse(txtBalanceSheet.Text.Replace("$", ""))) Dim DownPayment As Double = If(txtDownPayment.Text = "", 0, Double.Parse(txtDownPayment.Text.Replace("$", ""))) txtGoodWill.Text = SellingPrice - BallanceSheet txtBalance.Text = SellingPrice - DownPayment txtSellingPriceMult.Text = SellingPrice End Sub I've got this so far, but I'm not sure how to get much further. function txtSellingPrice_OnChange() { var txtSellingPrice = document.getElementById('<%=txtSellingPrice.ClientID %>') var txtBalanceSheet = document.getElementById('<%=txtBalanceSheet.ClientID %>') var txtDownPayment = document.getElementById('<%=txtDownPayment.ClientID %>') }

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  • very quickly getting total size of folder

    - by freakazo
    I want to quickly find the total size of any folder using python. def GetFolderSize(path): TotalSize = 0 for item in os.walk(path): for file in item[2]: try: TotalSize = TotalSize + getsize(join(item[0], file)) except: print("error with file: " + join(item[0], file)) return TotalSize That's the simple script I wrote to get the total size of the folder, it took around 60 seconds (+-5 seconds). By using multiprocessing I got it down to 23 seconds on a quad core machine. Using the Windows file explorer it takes only ~3 seconds (Right click- properties to see for yourself). So is there a faster way of finding the total size of a folder close to the speed that windows can do it? Windows 7, python 2.6 (Did searches but most of the time people used a very similar method to my own) Thanks in advance.

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  • NUnit vs Visual Studio 2010's MSTest?

    - by David White
    I realise that there are many older questions addressing the general question of NUnit v MSTest for versions of Visual Studio up to 2008 (such as this one). Microsoft have a history of getting things right in their 3rd version. For MSTest, that is VS2010. Have they done so with MSTest? Would you use it in a new project in preference to NUnit? My specific concerns: speed running tests within CruiseControl.NET (either commandline or MSBuild task) code coverage reports from CC.NET can you run MSTest tests in debug mode (We use ReSharper, so test-runners are not an issue for us. We have used NUnit for the last few years. We do not have TFS.)

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  • Inserting text to a file with Sed within Bash Script

    - by neversaint
    I tried to insert a text to the first line of a file using sed. I do this inside a bash script. But why it hangs at the line of sed execution? #! /bin/bash # Command to execute # ./mybashcode.sh test.nbq nbqfile=$1 nbqbase=$(basename $nbqfile nbq) taglistfiletemp="${nbqbase}taglist_temp" taglistfile="${nbqbase}taglist" ./myccode $nbqfile | sort | uniq -c | awk '{print $2}' > $taglistfiletemp noftags=$(wc -l $taglistfiletemp | awk '{print $1}') echo $noftags # We want to append output of noftags # to the first line of taglistfile sed '1i\ $noftags' > $taglistfile # why it hangs here # the content of taglistfile is NIL

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  • Seeking tuturial: introduction to ODBC with Delphi

    - by mawg
    I have a lot of embedded C/C++/Ada experience and an outdated smattering of Delphi plus some database stuff. Now I have to implement an app in Delphi which can manipulate MySql, Oracle, maybe MS Acess. In short, I need ODBC. I need to programatically created a database, define its structure and populate its contents, then later query its existence and programatically search. I would prefer not to use 3rd party components, unless there is a compelling reason to do so (performance ought not to be an issue for the app, it won't have much data or be run often, at least not in v1.0) . Can anyone point me at a tutorial which can get me up to speed? Thanks

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  • effective retrieve for a voting system in PHP and MySQL

    - by Adnan
    Hello, I have a system where registered users can vote up/vote down comment for a picture. Something very similar to SO's voting system. I store the votes in a table with values as such; vote_id | vote_comment_id | vote_user_id | vote_date | vote_type Now I have few a question concerned the speed and efficiency for the following; PROB: Once a user opens the picture page with comments I need, if that user has already voted UP/DOWN a comment to show it like; "you voted up" or "you voted down" next to the comment (in SO it the vote image is highlighted) MY POSSIBLE SOL: Right now when I open a picture page for each comment I loop thru, I loop thru my table of votes as well and check if a user has voted and show the status (I compare the vote_user_id with the user's session). How efficient is this? Anyone have a better approach to tackle this kind of problem?

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  • Themes wont work when using Server Side Tags on an ASP.NET Page

    - by Sumit Sharma
    The code for the asp.net page is: <div class="facebox_content"> <% if (CurrentUser.Role == "Free") { %> <table cellpadding="0" cellspacing="0" style="border-collapse:collapse;width:380px;"> <tr> <td> User Name : </td> <td> Membership Cost : </td> </tr> <tr> <td style="width:190px;"> <asp:TextBox ID="txtUserName" Enabled="false" runat="server" Text="<%= CurrentUser.Name %>"/> </td> <td style="width:190px;"> <asp:TextBox ID="txtCost" Enabled="false" runat="server" Text="2000"/> </td> </tr> <tr> <td> <br /> Cheque / Draft No.: </td> <td> <br /> Bank Drawn On : </td> </tr> <tr> <td style="width:190px;"> <asp:TextBox ID="txtChqNo" runat="server"></asp:TextBox> </td> <td style="width:190px;"> <asp:TextBox ID="txtBankName" runat="server"></asp:TextBox> </td> </tr> <tr> <td> <br /> Date : </td> <td> <br /> City : </td> </tr> <tr> <td style="width:190px;"> <asp:TextBox ID="txtDate" runat="server"></asp:TextBox> </td> <td style="width:190px;"> <asp:TextBox ID="txtCity" runat="server"></asp:TextBox> </td> </tr> </table> <% } else if(CurrentUser.Role == "Pending") { %> <p style="text-align:justify;"> Your Request is pending with our Administrators. Please be patient while your request is processed. Usually it takes 2-4 Days for your request to be processed after the payment has been received. </p> <% } else if(CurrentUser.Role == "Paid") { %> <p style="text-align:justify;"> You are already a Paid Member of Website </p> <% } %> The code for the C# file is: protected void Page_PreInit(object sender, EventArgs e) { this.Theme = CurrentUser.Theme; } protected void Page_Load(object sender, EventArgs e) { txtUserName.Text = CurrentUser.Name; ConfirmButton.Attributes.Add("onclick", "javascript:document.getElementById('" + lblMsg.ClientID + "').style.display='none';"); if (CurrentUser.Role != "Free") ConfirmButton.Visible = false; } The code is giving the following error: The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>). Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Web.HttpException: The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>). Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace: [HttpException (0x80004005): The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).] System.Web.UI.ControlCollection.Add(Control child) +8678903 System.Web.UI.PageTheme.SetStyleSheet() +478 System.Web.UI.Page.OnInit(EventArgs e) +8699660 System.Web.UI.Control.InitRecursive(Control namingContainer) +333 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +378 Please some one help me out..!!

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  • XNA, WPF light show visualizer

    - by Bgnt44
    HI all, I'm developing a software to control light show ( through DMX protocol ), i use C# and wpf to develop my main software (.net 4.0) To help people preview their show, i would like to make a live 3D visualizer... First, i thought that i could use wpf 3D to make the visualizer, but i need to work with light .. My main application should send property ( beam angle, orientation (X,Y), position(X,Y), Brush ( color,shape,effect)) to the 3D visualizer But i would like to be able to move light (position in the scene) by mouse during execution and had value in return... So .. Does XNA is the easiest way to doing that ? Can you help me for that : Generating light (orientation , bitmap like filter in front of light ) Dynamically moving object with mouse and get position in return Dynamically add or remove fixture All of your advice, sample, example are very welcome ... I don't espect to have a perfect result at the first time but i need to understand the main concepts for doing that Thank You !!

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  • C# 4: conflicting overloaded methods with optional parameters

    - by Thomas
    I have two overloaded methods, one with an optional parameter. void foo(string a) { } void foo(string a, int b = 0) { } now I call: foo("abc"); interestingly the first overload is called. why not the second overload with optional value set to zero? To be honest, I would have expect the compiler to bring an error, at least a warning to avoid unintentional execution of the wrong method. What's the reason for this behaviour? Why did the C# team define it that way? Thanks for your opinions!

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  • Installing a new SQL Server instance fails

    - by Rubio
    I've previously in my setup installed SQL Server Express 2005. Now I've switched to SQL Server Express 2008. I updated the command line parameters to those documented for the latter. If the comp already has SQL Server Express 2008 installed, my installer should create a new instance. The command line parameters are as follows: /ACTION=Install /FEATURES=SQLEngine /QS /INSTANCENAME=ABCD /SECURITYMODE=SQL /SAPWD=CunningPassword The requested instance name does not exist on the target machine. This will end in an error -2068643838. The logs show the following error: "No features were installed during the setup execution. The requested features may already be installed." If I remove the /QS parameter and try to install interactively, I'll get as far as the Feature Selection page. The UI shows three options, Instance Features, Shared Features and Redistributable Features. Whatever I select, clicking Next results in the same error (There are validation errors on this page). Any ideas anyone? Thanks, -- Rubio

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  • How to add a dynamic library to Android?

    - by Malcolm
    I want to add a non-native shared library to Android so every application on the device would be able to use it. I mean using packaged classes just like a core library as if they were present in the application itself. I studied Android source code to figure out a way to add a new path to the application ClassLoader and found out that it is created during startup and there's no way to change the paths later. I can use my own ClassLoader, but all I will get after loading a class will be a reference to a Class object. This way I will be bound to work through reflection mechanism, which is slower than the native execution system. Is there any way to organise a shared library on Android?

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  • After using modern languages, can C NOT be painful?

    - by Alexandre
    I started my computer engineering course recently and we've been using C for a couple of things. Before starting university, I was doing a lot of web development. I've written a lot of PHP code (yuck!) and for the last year or so Ruby exclusively. aside: I love Ruby, love it! So after a year of heavy Ruby development, is it wrong to think that C should be avoided at all costs unless absolutely necessary? Right now it seems to me I should try to a) get it to run in Ruby b) if it's too slow, try Java c) if it's too slow, use C Is there anyone who jumps straight to C if a VM (Ruby, Java, Python, etc) can be used on the machine and speed is not an issue? In other words, can C NOT be painful?

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  • javascript removeChild() and appendChild() VS display=none and display=block|inline

    - by Kucebe
    I'm developing a web application that shows some controls and descriptions dinamically (I don't want to use jQuery or other libraries). At this moment i make appear and disappear controls using: element.setAttribute("style", "inline"); and element.setAttribute("style", "none"); but i'm thinking about using: element.appendChild(childRef); and element.removeChild(childRef); So, which one is the best solution in terms of system speed and elegance of the code? (and of course, are there better solution?)

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  • Idiomatic way to do list/dict in Cython?

    - by ramanujan
    My problem: I've found that processing large data sets with raw C++ using the STL map and vector can often be considerably faster (and with lower memory footprint) than using Cython. I figure that part of this speed penalty is due to using Python lists and dicts, and that there might be some tricks to use less encumbered data structures in Cython. For example, this page (http://wiki.cython.org/tutorials/numpy) shows how to make numpy arrays very fast in Cython by predefining the size and types of the ND array. Question: Is there any way to do something similar with lists/dicts, e.g. by stating roughly how many elements or (key,value) pairs you expect to have in them? That is, is there an idiomatic way to convert lists/dicts to (fast) data structures in Cython? If not I guess I'll just have to write it in C++ and wrap in a Cython import.

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  • Python turtle module confusion

    - by John
    Hi, I'm trying to to add more lines to the triangle, so instead of 3 leading off there will be 5 depending on the parameter given but I really have no idea what to do at this stage and any help would be very welcome. Thanks in advance!:) def draw_sierpinski_triangle(tracer_on, colour, initial_modulus, line_width, initial_heading,initial_x, initial_y, steps): turtle=Turtle() turtle.name = 'Mother of all turtles' turtle.reset () turtle.tracer (tracer_on) turtle.speed ('fastest') turtle.color (colour) turtle.width (line_width) turtle.up() turtle.goto (initial_x, initial_y) turtle.down() turtle.set_heading (initial_heading) draw_sub_pattern (tracer_on, turtle, initial_modulus, 0, steps) def draw_sub_pattern (tracer_on, turtle, modulus, depth, steps): if (depth >= steps): return; x, y = turtle.position () heading = turtle.heading () # draw the pattern turtle.up() turtle.down() turtle.forward (modulus) draw_sub_pattern(tracer_on, turtle, modulus * 0.5, depth + 1, steps) turtle.up() turtle.goto(x, y) turtle.down() turtle.set_heading (heading + 120) turtle.forward (modulus) draw_sub_pattern(tracer_on, turtle, modulus * 0.5, depth + 1, steps) turtle.up() turtle.goto(x, y) turtle.down() turtle.set_heading (heading + 240) turtle.forward (modulus) draw_sub_pattern(tracer_on, turtle, modulus * 0.5, depth + 1, steps)

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  • jQuery - cycle help

    - by MrTunes
    I'm looking to get some help on using the cycle library for jQuery. I'm in the beginner demos, and I got the absolute first one completed. This is the second one on the page. <script src="jquery-1.2.6.min.js" type="text/javascript"></script> <script src="jquery.cycle.all.min.js" type="text/javascript"></script> <script type="text/javascript"> $(document).ready(function() { $('.pics').cycle({ fx: 'scrollDown', speed: 300, timeout: 2000 }); </script> My CSS is identical to the one on the page, that's why I put .pics in the quotes.

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