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• Question about WinForms TrackBar control in .Net

  - by Jules

  Does anyone know the millisecond interval, used by the framework trackbar, between calling the ValueChanged event when moving the grip with a mouse? I've implemented my own trackbar and I'd like the behaviour to be consistent with what the user expects. I've had a look in reflector but it's one of those controls where most of the implementation is not viewable. ETA: Actually, thinking about it, it's not as simple as that. For small changes, the TrackBar is raising the event for every change. However, if you make a large fast change with the grip, it will not raise the event for every step. Just wondering exactly how the framework does this? Thanks

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• Multiple rows with a single INSERT in SQLServer 2008

  - by Todd

  I am testing the speed of inserting multiple rows with a single INSERT statement. For example: INSERT INTO [MyTable] VALUES (5, 'dog'), (6, 'cat'), (3, 'fish) This is very fast until I pass 50 rows on a single statement, then the speed drops significantly. Inserting 10000 rows with batches of 50 take 0.9 seconds. Inserting 10000 rows with batches of 51 take 5.7 seconds. My question has two parts: Why is there such a hard performance drop at 50? Can I rely on this behavior and code my application to never send batches larger than 50? My tests were done in c++ and ADO.

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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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• Mapping of memory addresses to physical modules in Windows XP

  - by Josef Grahn

  I plan to run 32-bit Windows XP on a workstation with dual processors, based on Intel's Nehalem microarchitecture, and triple channel RAM. Even though XP is limited to 4 GB of RAM, my understanding is that it will function with more than 4 GB installed, but will only expose 4 GB (or slightly less). My question is: Assuming that 6 GB of RAM is installed in six 1 GB modules, which physical 4 GB will Windows actually map into its address space? In particular: Will it use all six 1 GB modules, taking advantage of all memory channels? (My guess is yes, and that the mapping to individual modules within a group happens in hardware.) Will it map 2 GB of address space to each of the two NUMA nodes (as each processor has it's own memory interface), or will one processor get fast access to 3 GB of RAM, while the other only has 1 GB? Thanks!

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• Using VB6 + WSH with Windows Compression

  - by OneNerd

  Having trouble with WSH and Windows Compression. My goal is to be able to zip up files (not folders, but individual files from various locations, which I have stored in an array) using the built-in Windows Compression. I am using VB6. Here is my routine (vb6 code): Dim objShell Dim objFolder Set objShell = CreateObject("Shell.Application") Set objFolder = objShell.namespace(savePath & "\export.zip") ' -- ' loop through array holding files to zip For i = 0 To filePointer objFolder.CopyHere (filesToZip(i)) Next ' -- Set objShell = Nothing Set objFolder = Nothing It works, but issues arise when there are more than a few files. I start getting errors from Windows (presumably, its calling the compression too fast, and the zip file is locked). I cant seem to figure out how to WAIT until the COPYHERE function completes before calling the next one to avoid issues. Does anyone have any experience with this? Thanks -

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• Performance analysis strategies

  - by Bernd

  I am assigned to a performance-tuning-debugging-troubleshooting task. Scenario: a multi-application environment running on several networked machines using databases. OS is Unix, DB is Oracle. Business logic is implemented across applications using synchronous/asynchronous communication. Applications are multi-user with several hundred call center users at peak time. User interfaces are web-based. Applications are third party, I can get access to developers and source code. I only have the production system and a functional test environment, no load test environment. Problem: bad performance! I need fast results. Management is going crazy. I got symptom examples like these: user interface actions taking minutes to complete. Seaching for a customer usually takes 6 seconds but an immediate subsequent search with same parameters may take 6 minutes. What would be your strategy for finding root causes?

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• Frequent Netbeans freezes

  - by danilo

  I'm using Netbeans 6.8 for PHP projects located on network drives in a Windows network. Frequently, the IDE gets really slow (like a temporary freeze) to a point where it's totally unusable. At first it seems like a total crash, but after some time (might be sevaral minutes) the IDE works again as before. This happens with Netbeans 6.7 as well as 6.8 on my Windows XP 32-bit installation. I'm using Java 1.6.0_13. This is a fresh Netbeans installation, so it can't have to do with too many temp files. I assume it has to do with the frequent code checks that Netbeans does. It's probably not very fast when doing this over the network connection. But it can't be that this feature renders the IDE useless... This thread deals with the same issue http://forums.netbeans.org/viewtopic.php?t=5548. Does anyone know a solution to this problem?

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• how to profile silverlight mvvm application with a lot of custom controls

  - by tomo

  There is a quite big LOB silverlight application and we wrote a lot of custom controls which are rather heavy in drawing. All data is loaded by RIA service, processed and bound (using INofityPropertyChanged interface) to the view. The problem is that first drawing takes a lot time. Following calls to the service (server) and redrawing is quite fast. I used Equatec profiler to track the problem. I saw that processing takes a couple of miliseconds only so my idea is that the drawing by SL engine is slow. I'm wondering if it is possible to profile somehow processes inside SL to check which drawing operations are taking too much time. Are there any guidelines how to implement faster drawing of complex custom controls?

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• cygwin slow file open

  - by Erdem

  My application uses fopen to open a lot of files. While in linux opening and reading thousand of files doesn't even take a second; in cygwin it takes more than 5 seconds. I think it is because path conversion functions in cygwin dlls. 'open' function is a bit faster. If I use -mno-cygwin it becomes very fast but I can't use it. Is there an easy way to make cygwin dlls just open files; without any linux-windows conversion?

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• How do I pass W3 validation for Google checkout url?

  - by Dinesh

  When I do validate the page in W3 validation, I got few errors with below code, <input type="image" name="Google Checkout" alt="Fast checkout through Google" src="https://sandbox.google.com/checkout/buttons/checkout.gif?merchant_id=xxxxxxxxx&w=168&h=44&style=white&variant=text&loc=en_US" / Errors are as follows, 1.cannot generate system identifier for general entity "w" 2.reference to entity "w" for which no system identifier could be generated 3.general entity "h" not defined and no default entity 4.reference to entity "h" for which no system identifier could be generated 5.general entity "style" not defined and no default entity 6.reference to entity "style" for which no system identifier could be generated 7.general entity "variant" not defined and no default entity 8.reference to entity "variant" for which no system identifier could be generated 9.general entity "loc" not defined and no default entity 10.reference to entity "loc" for which no system identifier could be generated This is the only errors comes from the URL; is there way to pass W3 validation for this URL.

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• OpenLayers, Layers: Tiled vs. single tile

  - by Chau

  Each time we add a new layer to our OpenLayers based website (data provided primarily by a GeoServer server), we discuss whether to use a single-tile or a tiled approach. Some of the parameters we evaluate are the following: Using the tiled approach we get: Slow but continuous buildup of the viewport Lots of small images Client side caching possibilities Blocking of the loading pipeline (6 requests at a time) Jerky feeling when navigating during load Using the single-tile approach we get: Smoother feeling when navigating during load Time delay before layer is loaded One large image for each layer No caching of the single tile We have a lot of data editing in the layers, thus a tile-cache might not be that efficient. Are there any best-practices when it comes to tiling? Progressing towards infinitely fast hardware and unlimited data connections, the discussion becomes irrelevant, but what configuration do you percieve as the most user-pleasing?

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• GTK+ (GTKSharp) poor performance in Windows

  - by nubela

  Hi, In my Mono (C#) project that is meant to be cross-platform, I am using the GTK for the UI. However one thing I noticed is, on my netbook in Archlinux, the performance is really speedy, so events such as mouse hover, and redrawing of widgets, etc, are really fast. Compared to windows (7) on dual core CPUs, the performance is really really weak. Which perplexes me. Am I doing something wrong that is warranting this difference in performance between OSes? What are some ways I can do to optimize GTK on Windows? Its really bad to take around 0.5 secs for a hover event to kick in whereas its almost immediate on a weak(er) netbook with Linux. My code is here for the GUI layer: http://code.google.com/p/subsynct/source/browse/branches/dev/subsync#subsync/GUI Thanks!

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• Tomcat 5.5, Is there a max upload speed per request?

  - by maclema

  I am having an issue when uploading files to tomcat. It seems that tomcat (or something else?) will not handle the upload as fast as I can send it. When uploading multiple files concurrently I can max out my local connection upload speed (2.1MB/s). However, when uploading only one file at a time, no matter how small or large the file, the upload will max out around 400KB/s. I have tried setting the appReadBufSize higher but it makes no difference. Is there something else that would be limiting the upload speed per request? Proxy Server: CentOS 4 Apache 2 SSL Tomcat Server: CentOS 4 Tomcat 5.5.25 (Tomcat Native Library Is Installed) Java 6 Thanks! Matt

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• Eager loading vs. many queries with PHP, SQLite

  - by Mike

  I have an application that has an n+1 query problem, but when I implemented a way to load the data eagerly, I found absolutely no performance gain. I do use an identity map, so objects are only created once. Here's a benchmark of ~3000 objects. first query + first object creation: 0.00636100769043 sec. memory usage: 190008 bytes iterate through all objects (queries + objects creation): 1.98003697395 sec. memory usage: 7717116 bytes And here's one when I use eager loading. query: 0.0881109237671 sec. memory usage: 6948004 bytes object creation: 1.91053009033 sec. memory usage: 12650368 bytes iterate through all objects: 1.96605396271 sec. memory usage: 12686836 bytes So my questions are Is SQLite just magically lightning fast when it comes to small queries? (I'm used to working with MySQL.) Does this just seem wrong to anyone? Shouldn't eager loading have given much better performance?

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• Unit Testing in ASP.NET MVC: Minimising the number of asserts per test

  - by Neil Barnwell

  I'm trying out TDD on a greenfield hobby app in ASP.NET MVC, and have started to get test methods such as the following: [Test] public void Index_GetRequest_ShouldReturnPopulatedIndexViewModel() { var controller = new EmployeeController(); controller.EmployeeService = GetPrePopulatedEmployeeService(); var actionResult = (ViewResult)controller.Index(); var employeeIndexViewModel = (EmployeeIndexViewModel)actionResult.ViewData.Model; EmployeeDetailsViewModel employeeViewModel = employeeIndexViewModel.Items[0]; Assert.AreEqual(1, employeeViewModel.ID); Assert.AreEqual("Neil Barnwell", employeeViewModel.Name); Assert.AreEqual("ABC123", employeeViewModel.PayrollNumber); } Now I'm aware that ideally tests will only have one Assert.xxx() call, but does that mean I should refactor the above to separate tests with names such as: Index_GetRequest_ShouldReturnPopulatedIndexViewModelWithCorrectID Index_GetRequest_ShouldReturnPopulatedIndexViewModelWithCorrectName Index_GetRequest_ShouldReturnPopulatedIndexViewModelWithCorrectPayrollNumber ...where the majority of the test is duplicated code (which therefore is being tested more than once and violates the "keep tests fast" advice)? That seems to be taking it to the extreme to me, so if I'm right as I am, what is the real-world meaning of the "one assert per test" advice?

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• Visual Studio 2008 freezing when editing aspx/master pages

  - by jayrdub

  Visual Studio freezes up continually when I'm editing master pages or aspx files. Here's what I've tried that have not helped: restarting VS only working with few files open at a time Disabled all addins (resharper etc.) deleted .suo and .user files changed default editor from Web Form Editor and Master Page Editor to HTML Editor installed SP1 I don't have tons of files - 3 Master pages and maybe 30 aspx files. It is a asp.net mvc project. All I have to do to get VS to freeze is type a little text or even just paste. The freezing lasts a good 5-10 seconds. My machine has 4GB of RAM and fast disks. Could it have anything to do with asp.net mvc? Would the amount and size of other projects in the solution affect the editor?

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• Suggest Cassandra data model for an existing schema

  - by Andriy Bohdan

  Hello guys! I hope there's someone who can help me suggest a suitable data model to be implemented using nosql database Apache Cassandra. More of than I need it to work under high loads and large amounts of data. Simplified I have 3 types of objects: Product Tag ProductTag Product: key - string key name - string .... - some other fields Tag: key - string key name - unique tag words ProductTag: product_key - foreign key referring to product tag_key - foreign key referring to tag rating - this is rating of tag for this product Each product may have 0 or many tags. Tag may be assigned to 1 or many products. Means relation between products and tags is many-to-many in terms of relational databases. Value of "rating" is updated "very" often. I need to be run the following queries Select objects by keys Select tags for product ordered by rating Select products by tag order by rating Update rating by product_key and tag_key The most important is to make these queries really fast on large amounts of data, considering that rating is constantly updated.

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• MGTwitterEngine - Using getImageAtURL on iPhone

  - by Andrew Malchow

  Essentially, I'm working on asynchronously downloading images and adding them to specific UITableView cells (twitter profile images using MGTwitterEngine from Matt Gemmell). I've looked at general asynchronous download code and must admit, I'm still too much of a noob to understand it well enough to adapt it to my purposes. Instead, I'm attempting to use Gemmell's included getImageAtUrl method to add the images. I have it working to the point that -imageReceived: receives the images for visible cells, however, I'm stuck as to how to include them into the appropriate cells at that point. - (void)imageReceived:(UIImage *)image forRequest:(NSString *)identifier { NSLog(@"Got an image:%@",image); // What goes here? Or elsewhere? } This method is within my main view controller, I also have a custom cell controller where I'm drawing the cell content using Loren Brichter's fast scrolling code. Any help with this MGTwitterEngine method in particular, or with dynamically adding these images to my table cells would be greatly appreciated.

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• how to optimize illustrator artwork in flash?

  - by sasi

  I'm working on a flash project that incorporates a lot of artwork done in Illustrator CS4. I've been copy-pasting directly from Illustrator into Flash, and I add some animations as well. Final file is going to be a one single swf file which will be a part of UI for an application and .net will be the core for this. But now flash becomes unusable slow to respond for actions. My machine is a fast i7 with 6gb of RAM, so I don't think that's the issue. We are going to use this file with dual core atom processors. Does anyone have ideas for alternative importing techniques, optimizations within illustrator, anything at all that will make this more manageable? Thanks

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• Disabling scoring in Lucene(.NET)

  - by user72185

  Hi, When searching, is there a way to disable scoring for any query? The scenario is that the user refines his query by trying different combinations of words, phrases etc., and needs realtime (well, reasonably fast at least) responses on the number of hits. Search time slows down a lot when there are millions of hits due to scoring, but the user really doesn't care about all these documents. As soon as he sees there are 1M+ hits he will start adding additional words to the query. A "Sort by relevance" option would allow him to do this quickly, while turning scoring back on when the number of hits is reasonable. Is this possible? I'm using Lucene.NET 2.9.2 but AFAIK it is identical to the Java version.

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• Huge dataset point in polygon in .net (collision detection)

  - by Rickard Liljeberg

  I have a pretty big mesh with polygons, usually triangles but sometimes rectangles. Each point in my mesh has a value (value has nothing to do with coordinates). Now I am creating a second mesh in the same coordinate-space as the old mesh. I now want to interpolate out values for all points (vertices) in the new mesh using the values from the old mesh. Now I could loop each polygon in the new mesh and detect which old vertices are in each polygon by making 2d collision detection (altho even this I don't get to function properly so if anyone has simple and fast code for 2d collision detection (triangle is enough) I would gladly see it). However to my main point again. looping each old vertice for each new polygon seems less than efficient. is there a better way?

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• Safe non-tamperable URL component in Perl using symmetric encryption?

  - by Randal Schwartz

  OK, I'm probably just having a bad Monday, but I have the following need and I'm seeing lots of partial solutions but I'm sure I'm not the first person to need this, so I'm wondering if I'm missing the obvious. $client has 50 to 500 bytes worth of binary data that must be inserted into the middle of a URL and roundtrip to their customer's browser. Since it's part of the URL, we're up against the 1K "theoretical" limit of a GET URL. Also, $client doesn't want their customer decoding the data, or tampering with it without detection. $client would also prefer not to store anything server-side, so this must be completely standalone. Must be Perl code, and fast, in both encoding and decoding. I think the last step can be base64. But what are the steps for encryption and hashing that make the most sense?

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• Cannot install Curb gem on Netbeans 6.9 R2

  - by Zeck

  Hi guys, I'm trying to install feedzirra. When i install curb on my netbeans i get following errors. Building native extensions. This could take a while... ERROR: Error installing curb-0.7.6.gem: ERROR: Failed to build gem native extension. "C:/Program Files/NetBeans 6.9 RC2/ruby/jruby-1.5.0/bin/jruby.bat.exe" extconf.rb '"C:/Program Files/NetBeans 6.9 RC2/ruby/jruby-1.5.0/bin/jruby.bat.exe"' is not recognized as an internal or external command, operable program or batch file. Gem files will remain installed in C:/Program Files/NetBeans 6.9 RC2/ruby/jruby-1.5.0/lib/ruby/gems/1.8/gems/curb-0.7.6 for inspection. Results logged to C:/Program Files/NetBeans 6.9 RC2/ruby/jruby-1.5.0/lib/ruby/gems/1.8/gems/curb-0.7.6/ext/gem_make.out Any ideas how I can get this to work? Or did you know very fast feed parser gem?

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• Jquery - Get all other menus to slide up

  - by Jova

  I have a drop down menu made with Jquery. Right now, if you hover over all the menu items, their submenus will all show at the same time. I would like that if I hover over one menu, then go to the next, that the previous menu's submenu will slide back up. As it is now, I have to hover out of the submenus for them to slide up. To put it simpler, when hovering over a parent menu, slide up all other parent menu's submenus if they're open. $("#DropDownMenu li.parent").hover(function() { $(this).find(".subMenu").slideDown('fast').show(); $(this).parent().find(".subMenu").hover(function() { }, function() { $(this).parent().find(".subMenu").slideUp('slow'); }); });

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• How to Uncheck A radio button

  - by user281867

  Hi, I have two forms, one with a radio button that users must select to edit. [form name="A"] [input type="radio" name="BookItem" value="1" /] [input type="radio" name="BookItem" value="2" /] [input type="radio" name="BookItem" value="3" /] [form] After "BookItem" is selected from form (A) I call the $("#EditFormWrapper").load("callEditData.cfm? ID="+ID); function to load the second form (B) [form id="editForm" name="B"] 2 Hours AM 2 Hours PM 2 Hours AM 2 Hours PM [input type="image" src="images/submit-btn.gif" id="addBTN" name="addBTN" class="buttons" alt="SubmitRrequest" /] [input type="image" src="images/cancel-btn.gif" id="editBTNcancel" name="editBTNcancel" class="buttons" alt="Cancel Request" /] [/form] I want to uncheck the radio button on form (A) when user click on cancel button (editBTNcancel) in form(B). Here s my script: $("#editBTNcancel").live("click", function(event){ event.preventDefault(); $("#EditFormWrapper").slideUp("fast").empty(); //$('.TOR2Hours').removeAttr('checked'); $('.TOR2Hours').attr('checked', false); }); I hope I clearly state my problem, any suggestion would be greatly appreciated!

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