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  • How to improve performance

    - by Ram
    Hi, In one of mine applications I am dealing with graphics objects. I am using open source GPC library to clip/merge two shapes. To improve accuracy I am sampling (adding multiple points between two edges) existing shapes. But before displaying back the merged shape I need to remove all the points between two edges. But I am not able to find an efficient algorithm that will remove all points between two edges which has same slope with minimum CPU utilization. Currently all points are of type PointF Any pointer on this will be a great help.

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  • Using XCode and instruments to improve iPhone app performance

    - by MrDatabase
    I've been experimenting with Instruments off and on for a while and and I still can't do the following (with any sensible results): determine or estimate the average runtime of a function that's called many times. For example if I'm driving my gameLoop at 60 Hz with a CADisplayLink I'd like to see how long the loop takes to run on average... 10 ms? 30 ms etc. I've come close with the "CPU activity" instrument but the results are inconsistent or don't make sense. The time profiler seems promising but all I can get is "% of runtime"... and I'd like an actual runtime.

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  • Refresh a control on the master page after postback

    - by Andreas
    Hi all! What i am trying to do here is to show a couple of validation messages in form of a bulletlist, so i have a Div on my master page containing a asp:bulletlist. Like this: <div> <asp:BulletedList ID="blstValidationErrorMessage" runat="server" BulletStyle="Disc"> </asp:BulletedList> </div> When i then click the Save button from any of my pages (inside the main contentPlaceHolder) i create a list of messages and give this list as datasouce like this: blstValidationErrorMessage.DataSource = validationMessageCollection; blstValidationErrorMessage.DataBind(); The save button is located inside an updatepanel: asp:UpdatePanel runat="server" ID="UpdatePanel" ChildrenAsTriggers="true" UpdateMode="Conditional" Nothing happens, i can see that the datasource of the bulletlist contains X items, the problems must arise because the Save button is inside an update panel and the elements outside this updatepanel (master page controls for example) is not refreshed. So my question is, how do i make the bulletlist refresh after the postback? Thanks in advance.

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  • a4j:commandButton causes full page reload on IE7

    - by Greg Charles
    Our process allows users to activate their account, and then configure e-mail preferences. We're using the tag: <a4j:commandButton id="activate" action="#{controller.agreeAction}" image="/img/ok.png" styleClass="activate-button" reRender="mainContent, sideBar" oncomplete="showEmailDialog();" /> This works fine on Firefox, but on IE, the showEmaiDialog() fires off to display the new dialog, and then the full page reloads, which instantly hides it again. I put in numerous alert() calls to make sure of what was happening. I see the e-mail dialog until I clear the final alert box in in the showEmailDialog() script, and then I see the alerts that I put into jQuery(document).ready(). Why does IE do a full page reload instead of just refreshing the requested sections?

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  • Difference in linq-to-sql query performance using GenericRespositry

    - by Neil
    Given i have a class like so in my Data Layer public class GenericRepository<TEntity> where TEntity : class { [System.ComponentModel.DataObjectMethod(System.ComponentModel.DataObjectMethodType.Select)] public IQueryable<TEntity> SelectAll() { return DataContext.GetTable<TEntity>(); } } I would be able to query a table in my database like so from a higher layer using (GenericRepositry<MyTable> mytable = new GenericRepositry<MyTable>()) { var myresult = from m in mytable.SelectAll() where m.IsActive select m; } is this considerably slower than using the usual code in my Data Layer using (MyDataContext ctx = new MyDataContext()) { var myresult = from m in ctx.MyTable where m.IsActive select m; } Eliminating the need to write simple single table selects in the Data layer saves a lot of time, but will i regret it?

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  • High performance querying - Sugestions please

    - by Alex Takitani
    Supposing that I have millions of user profiles, with hundreds of fields (name, gender, preferred pet and so on...). With database would You choose? Suppose that You have a Facebook like load. Speed is a must. Open Source preferred. I've read a lot about Cassandra, HBase, Mongo, Mysql... I just can't decide.....

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  • Page won't load on IE9 unless developer tools are started first

    - by RoyHB
    One of my pages (with very extensive javascript) won't load on IE9. It loads ok in Mozilla, Chrome, Safari and Opera. If IE9 Developer tools are running it loads fine. If I load IE9, load the developer tools (F12) then kill the developer tools it still loads fine. If developer tools are running then sometimes (but not always) the first message in the console is: HTML1113: Document mode restart from Quirks to IE9 Standards Doctype is: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> If I change doctype to and remove the xmlns nothing changes. I'm stumped. Any suggestions appreciated.

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  • Segmentation fault when accessing a PHP page

    - by Justin Ethier
    Sometimes when one of our Apache web servers is restarted, we experience segmentation faults when any PHP page is subsequently accessed. The following line is printed in the httpd error_log: [Wed Jun 16 10:59:33 2010] [notice] child pid 31513 exit signal Segmentation fault (11) There will be one of these lines for each PHP page that is accessed. This appears to happen randomly - the "workaround" to-date is to restart httpd, which eventually fixes the problem (almost always after a single restart). Although we only see this happen rarely, it still happens frequently enough to be of concern. So my question is, why is this happening in the first place? Is this a known bug with the version of Apache / PHP / Linux / etc that we are using? Any ideas? The environment is: Fedora 11 Apache 2.2.15 (Default settings) PHP 5.2.13 I can provide more information if that would help narrow things down, since this error message is rather generic... Any help is appreciated.

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  • "Order By" in LINQ-to-SQL Causes performance issues

    - by panamack
    I've set out to write a method in my C# application which can return an ordered subset of names from a table containing about 2000 names starting at the 100th name and returning the next 20 names. I'm doing this so I can populate a WPF DataGrid in my UI and do some custom paging. I've been using LINQ to SQL but hit a snag with this long executing query so I'm examining the SQL the LINQ query is using (Query B below). Query A runs well: SELECT TOP (20) [t0].[subject_id] AS [Subject_id], [t0].[session_id] AS [Session_id], [t0].[name] AS [Name] FROM [Subjects] AS [t0] WHERE (NOT (EXISTS( SELECT NULL AS [EMPTY] FROM ( SELECT TOP (100) [t1].[subject_id] FROM [Subjects] AS [t1] WHERE [t1].[session_id] = 1 ORDER BY [t1].[name] ) AS [t2] WHERE [t0].[subject_id] = [t2].[subject_id] ))) AND ([t0].[session_id] = 1) Query B takes 40 seconds: SELECT TOP (20) [t0].[subject_id] AS [Subject_id], [t0].[session_id] AS [Session_id], [t0].[name] AS [Name] FROM [Subjects] AS [t0] WHERE (NOT (EXISTS( SELECT NULL AS [EMPTY] FROM ( SELECT TOP (100) [t1].[subject_id] FROM [Subjects] AS [t1] WHERE [t1].[session_id] = 1 ORDER BY [t1].[name] ) AS [t2] WHERE [t0].[subject_id] = [t2].[subject_id] ))) AND ([t0].[session_id] = 1) ORDER BY [t0].[name] When I add the ORDER BY [t0].[name] to the outer query it slows down the query. How can I improve the second query? This was my LINQ stuff Nick int sessionId = 1; int start = 100; int count = 20; // Query subjects with the shoot's session id var subjects = cldb.Subjects.Where<Subject>(s => s.Session_id == sessionId); // Filter as per params var orderedSubjects = subjects .OrderBy<Subject, string>( s => s.Col_zero ); var filteredSubjects = orderedSubjects .Skip<Subject>(start) .Take<Subject>(count);

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  • Magento: Customer Comment on order page required field

    - by Shamim Ahmed
    I am using whiteOrderComment module for customer comment on order review page. but in this section text-area field required option not working. I did little bit change on /checkout-onepage-review-button.phtml like this <script type="text/javascript"> function validate(){ if(document.getElementById("whiteOrderComment").value == ""){ alert('Required'); }else{ review.save(); } </script> <button type="submit" title="<?php echo $this->__('Place Order') ?>" class="button btn-checkout" onclick="validate();"><span><span><?php echo $this->__('Place Order') ?></span></span></button> but in this page javascript not working. can you please give any better idea, how can i make this text-area field required. thanks

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  • How to index a table with a Type 2 slowly changing dimension for optimal performance

    - by The Lazy DBA
    Suppose you have a table with a Type 2 slowly-changing dimension. Let's express this table as follows, with the following columns: * [Key] * [Value1] * ... * [ValueN] * [StartDate] * [ExpiryDate] In this example, let's suppose that [StartDate] is effectively the date in which the values for a given [Key] become known to the system. So our primary key would be composed of both [StartDate] and [Key]. When a new set of values arrives for a given [Key], we assign [ExpiryDate] to some pre-defined high surrogate value such as '12/31/9999'. We then set the existing "most recent" records for that [Key] to have an [ExpiryDate] that is equal to the [StartDate] of the new value. A simple update based on a join. So if we always wanted to get the most recent records for a given [Key], we know we could create a clustered index that is: * [ExpiryDate] ASC * [Key] ASC Although the keyspace may be very wide (say, a million keys), we can minimize the number of pages between reads by initially ordering them by [ExpiryDate]. And since we know the most recent record for a given key will always have an [ExpiryDate] of '12/31/9999', we can use that to our advantage. However... what if we want to get a point-in-time snapshot of all [Key]s at a given time? Theoretically, the entirety of the keyspace isn't all being updated at the same time. Therefore for a given point-in-time, the window between [StartDate] and [ExpiryDate] is variable, so ordering by either [StartDate] or [ExpiryDate] would never yield a result in which all the records you're looking for are contiguous. Granted, you can immediately throw out all records in which the [StartDate] is greater than your defined point-in-time. In essence, in a typical RDBMS, what indexing strategy affords the best way to minimize the number of reads to retrieve the values for all keys for a given point-in-time? I realize I can at least maximize IO by partitioning the table by [Key], however this certainly isn't ideal. Alternatively, is there a different type of slowly-changing-dimension that solves this problem in a more performant manner?

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  • Page content bleeding past footer, dynamic resize?

    - by Spider
    Hey all im learning as i go with editing CSS and PHP and ive manage to put together a layout, looks fine on the main page, but I noticed the content is not stretching properly height wise when i goto click on the 3D gallery. Here is the a link to the page that has the issue: http://www.idreamfx.com/wp/?page_id=36&album=1&gallery=2 as you can see its bleeding past the footer, and the content section is not resizing properly. What steps do i take to allow it to be dynamically resized with the content in it? Doing some searching i came across the code: but i'm not sure if how or rather, where to apply such a code or what it really does?

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  • Cant set drop down list selected value in page load

    - by Ben
    Hi, I'm trying to set the selected value of a ddl during page load ie. before databind. This causes "selected value does not exist" errors. So I force a databind, and add a new element if it does not exist in the data source. However it looks like when the databind is performed later in the page lifecycle that my added element(s) are removed/overwritten. Am I setting the values in the wrong part of the life cycle? what I'm doing seems rather hackish and I think im going about this the wrong way... is there a better way to do this?

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  • jquery hasClass "active" on ul#navigation li on page load not working

    - by Ross
    $(document).ready(function(){ $("li").click(function(){ if ($(this).hasClass("active") ) $(this).fadeTo("slow", 1.0); }); }); I have a navigation bar made and am using this code to add a transparency effect on hover: $(document).ready(function(){ $(".thumbs").fadeTo("slow", 0.6); $(".thumbs").hover(function(){ $(this).fadeTo("slow", 1.0); },function(){ $(this).fadeTo("slow", 0.4); }); }); I'm also using hoverIntent. The opacity rollover works a treat, but I'd like my "active" page to have 100% opacity, but I can't seem to get it to work..what am I doing wrong? the link in questions HTML is: <ul id="navigation"> <li class="active"><a href="page.htm"></a></li> </ul> the nav works perfect minus my "active" class so I think I provided all the necessary code. thank you.

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  • Can Symfony simply reload a page request?

    - by Rob Wilkerson
    I have an app that receives a request from another app. It detects a value on the query string, checks that value against a cached value and, if they don't match, it needs to clear its cache and reload the page (establishing a new cache). Unfortunately, I can't find a way to tell Symfony to redirect to the current page in exactly the same format (protocol, URI path, query string, etc.). What am I missing? This is all happening in a filter on isFirstCall(). Thanks.

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  • MonoTouch - foreach vs for loops (performance)

    - by ifwdev
    Normally I'm well aware that a consideration like this is premature optimization. Right now I have some event handlers being attached inside a foreach loop. I am wondering if this style might be prone to leaks or inefficient memory use due to closures being created. Is there any validity to this thinking?

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  • Apache Bench reports different result with same page

    - by Aspis
    I'm running into a little problem base-lining an Apache2/fcgi/php-fpm server I am setting up. 1) If I run: ab -n 15000 http://mysite.com/index.php. Apache Bench returns Time per request: 41ms but document length: 0 bytes and html transferred: 0 bytes. The Transfer rate: 7.9Kb/s. 2) If I run: ab -n 15000 http://mysite.com/ Apache Bench returns Time per request: 83ms along with the accurate document length and html transferred total. The APC cache status reports identical hit counts from both test. Also Apache Bench reports no errors in either case. Overall, no errors on any test sites and all logs are clean, etc. DocumentRoot is set to index.php so I would expect both of these test runs to produced a similar result. My 2 question(s) are: 1) why the discrepancy? 2) which is the correct result? I've seen plenty of results like test 1 posted (with out question) but frankly from my own experience and those of others, accurate testing is hard to come by. Even with out goofy issues like this.

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  • Performance issues with testing on an ADP2

    - by Stuart
    I have an Android Developer Phone with Android 1.6 installed, sometimes it will take 30 seconds for the home screen to appear after a call or exiting from an application. Why is my phone so slow? Should I replace the memory card? Also, when is the 2.0 coming out for the ADP2? How do I install it?

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  • Horrible eclipse performance on macbook pro running 10.5.8

    - by user246114
    Hi I am using eclipse galileo on my macbook pro. After a few minutes it starts dragging really badly, like it takes 8 seconds to open a file. I don't have many files open at all. I already modified the config file to increase ram and all that stuff. Is there something wrong with this version of eclipse, never had it run so poorly on here, Thanks

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  • Horrible eclipse performance on macbook pro running 10.5.8

    - by user246114
    Hi I am using eclipse galileo on my macbook pro. After a few minutes it starts dragging really badly, like it takes 8 seconds to open a file. I don't have many files open at all. I already modified the config file to increase ram and all that stuff. Is there something wrong with this version of eclipse, never had it run so poorly on here, Thanks

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  • Can't re-open "Group My Tabs" page after killing Firefox

    - by isomorphismes
    Due to memory problems I closed Firefox whilst the Group My Tabs (Ctrl+e) feature was displaying the multiple tab groups. After 20 minutes the process still hadn't finished so killall firefoxed it. When I restart Firefox, there is a Javascript process called tabview.js that hangs unless I click Stop at the warning screen. If I do hit Stop then I can no longer open the tabview, so I can't get to any of the tabs except in the subgroup I was last looking at. Any suggestions?

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