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• CUDA Driver API vs. CUDA runtime

  - by Morten Christiansen

  When writing CUDA applications, you can either work at the driver level or at the runtime level as illustrated on this image (The libraries are CUFFT and CUBLAS for advanced math): I assume the tradeoff between the two are increased performance for the low-evel API but at the cost of increased complexity of code. What are the concrete differences and are there any significant things which you cannot do with the high-level API? I am using CUDA.net for interop with C# and it is built as a copy of the driver API. This encourages writing a lot of rather complex code in C# while the C++ equivalent would be more simple using the runtime API. Is there anything to win by doing it this way? The one benefit I can see is that it is easier to integrate intelligent error handling with the rest of the C# code.

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• Is SiteCore slow and buggy?

  - by Larsenal

  I've seen plenty of negative comments regarding performance and general bugginess. However, to be fair, most of these look like they were within the v5.3 timeframe. Have they fixed all of those issues in v6.0? Is it an excellent product? Some examples of the complaints: Maybe it’s just a case of user error, but this guy says, “some pages take as much as 20s to render…” Source Here, in the comments, one fellow remaks, “Sitecore backend is incredible slow. Sitecore developement is really pain, it takes from 2 minutes to start sitecore and many many seconds to do small backend operations. They claim to have a quick client, but that is a BIG LIE. All developers in my company really hate sitecore for being so slow.” Source Another search yielded, “Sitecore’s users listed three issues as number one: licensing, the server as a resource hog, and the site’s slow responsiveness.” Source

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• ASP.NET AJAX ToolkitScriptManager Issue With Combining Scripts

  - by Kumar

  I have an ASP.NET 3.5 web application in which i am using the ToolkitScriptManager as below: <ajaxToolkit:ToolkitScriptManager ID="ToolkitScriptManager1" EnablePageMethods="true" ScriptMode="Release" LoadScriptsBeforeUI="false" runat="server" CombineScripts="false"> <CompositeScript> <Scripts> <asp:ScriptReference Path="~/JavaScript/jquery-1.4.1.min.js" /> <asp:ScriptReference Path="~/JavaScript/Validators.js" /> </Scripts> </CompositeScript> </ajaxToolkit:ToolkitScriptManager> This works fine but from a performance standpoint this is not good as the pages are making a lot of requests to the webresources.axd and scriptresource.axd files. When I changed the CombineScripts property to true my ASP.NET AJAX control extenders are no longer working. What is the reason for this weired behavior and is there a fix for this?

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• JSR-299 CDI / Weld vs. Google Guice

  - by deamon

  Weld, the JSR-299 Contexts and Dependency Injection reference implementation, considers itself as a kind of successor of Spring and Guice. CDI was influenced by a number of existing Java frameworks, including Seam, Guice and Spring. However, CDI has its own, very distinct, character: more typesafe than Seam, more stateful and less XML-centric than Spring, more web and enterprise-application capable than Guice. But it couldn't have been any of these without inspiration from the frameworks mentioned and lots of collaboration and hard work by the JSR-299 Expert Group (EG). http://docs.jboss.org/weld/reference/latest/en-US/html/1.html What makes Weld more capable for enterprise application compared to Guice? Are there any advantages or disadvantages compared to Guice? What do you think about Guice AOP compared to Weld interceptors? What about performance?

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• Compiled Linq & String.Contains

  - by sharru

  i'm using linq-to-sql and i'm use complied linq for better performance. I have a users table with a INT field called "LookingFor" that can have the following values.1,2,3,12,123,13,23. I wrote a query to return the users based on the "lookingFor" column i want to return all users that contains the "lookingFor" value (not only those equal to it). In example if user.LookingFor = 12 , and query paramter is 1 this user should be selected. private static Func<NeDataContext, int, IQueryable<int>> MainSearchQuery = CompiledQuery.Compile((NeDataContext db, int lookingFor) => (from u in db.Users where (lookingFor == -1 ? true : u.LookingFor.ToString().Contains(lookingFor) select u.username); This WORKS on non complied linq but throws error when using complied. How do i fix it to work using complied linq? I get this error: Only arguments that can be evaluated on the client are supported for the String.Contains method.

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• Search algorithm (with a sort algorithm already implemented)

  - by msr

  Hello, Im doing a Java application and Im facing some doubts in which concerns performance. I have a PriorityQueue which guarantees me the element removed is the one with greater priority. That PriorityQueue has instances of class Event (which implements Comparable interface). Each Event is associated with a Entity. The size of that priorityqueue could be huge and very frequently I will have to remove events associated to an entity. Right now Im using an iterator to run all the priorityqueue. However Im finding it heavy and I wonder if there are better alternatives to search and remove events associated with an entity "xpto". Any suggestions? Thanks!

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• ListView items not clickable with HorizontalScrollView inside

  - by Felix

  I have quite a complicated ListView. Each item looks something like this: > LinearLayout (vertical) > LinearLayout (horizontal) > include (horizontal LinearLayout with two TextViews) > include (ditto) > include (ditto) > TextView > HorizontalScrollView (this guy is my problem) > LinearLayout (horizontal) In my activity, when an item is created (getView() is called) I add dynamic TextViews to the LinearLayout inside the HorizontalScrollView (besides filling the other, simpler stuff out). Amazingly, performance is pretty good. My problem is that when I added the HorizontalScrollView, my list items became unclickable. They don't get the orange background when clicked and they don't fire the OnItemClickedListener I have set up (to do a simple Log.d call). How can I make my list items clickable again?

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• Method 'SingleOrDefault' not supported by Linq to Entities

  - by user300992

  I read other posts on similar problem on using SingleOfDefault on Linq-To-Entity, some suggested using "First()" and some others suggested using "Extension" method to implement the Single(). This code throws exception: Movie movie = (from a in movies where a.MovieID == '12345' select a).SingleOrDefault(); If I convert the object query to a List using .ToList(), "SingleOrDefault()" actually works perfectly without throwing any error. My question is: Is it not good to convert to List? Is it going to be performance issue for more complicated queries? What does it get translated in SQL? Movie movie = (from a in movies.ToList() where a.MovieID == '12345' select a).SingleOrDefault();

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• C# - Recursive / Reflection Property Values

  - by tyndall

  What is the best way to go about this in C#? string propPath = "ShippingInfo.Address.Street"; I'll have a property path like the one above read from a mapping file. I need to be able to ask the Order object what the value of the code below will be. this.ShippingInfo.Address.Street Balancing performance with elegance. All object graph relationships should be one-to-one. Part 2: how hard would it be to add in the capability for it to grab the first one if its a List< or something like it.

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• Erlang: 2 database on 2 webserver ??

  - by xRobot

  I have created a blogging system with php+postgresql. Now I want to add a web chat ( in REAL TIME for Million of users simultaneously ) where every message is saved in database. I am thinking to use Erlang+Mnesia on a different webserver for this issue. Message's table will be like this: message_id, user_id, message, date user_id should be related with users table in Postgresql database in another webserver. How can I do that without lose performance ? If you have any other creative solutions tell me please ;).

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• Silverlight local storage

  - by IMHO

  As you may know Silverlight has support for local storage. We are looking at creating Sl application that will work in off line mode. This application may require quite a bit of data to be cached on the client side. Obvious solution - use local storage with some sort of XMl based structure won't work as our PoC showed due to performance issues. We are looking at several 3rd party solutions that implement light database engines on top of SL local storage. If you have solved this problem in the past or have any ideas - I would appreciate some pointers and ideas.

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• Delphi 2010 Professional and remote database access

  - by Kico Lobo

  Hi, When looking for which version of Delphi 2010 to buy, we found the following limitation on the professional one: Delphi 2010 Professional is designed for developers building high-performance desktop GUI and touch-screen applications with (or without) embedded and local database persistence. What does this really mean? Does this mean that we'll only face this restriction if we choose to use the native vcl components for database access we'll face this restriction. And what if we choose to use ADO components instead of those? In this case, how can Delphi avoid us to access remote database servers? Did anyone here ever tried this? Going even further: if we choose to use a database like Firebird, which is just one file, and used a network mapped drive. Could we be facing the same limitation? Supposing we opt for ADO, what will be the main consequences?

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• c# Network Programming - HTTPWebRequest Scraping

  - by masterguru

  Hi, I am building a web scraping application. It should scrape a complex web site with concurrent HttpWebRequests from a single host to a single target web server. The application should run on Windows server 2008. One single HttpWebRequest for data could take from 1 minute to 4 minutes to complete (because of long running db operations) I should have at least 100 parallel requests to the target web server, but i have noticed that when i use more then 2-3 long-running requests i have big performance issues (request timeouts/hanging). How many concurrent requests can i have in this scenario from a single host to a single target web server? can i use Thread Pools in the application to run parallel HttpWebRequests to the server? will i have any issues with the default outbound HTTP connection/requests limits? what about Request timeouts when i reach outbound connection limits? what would be the best setup for my scenario? Any help would be appreciated. Thanks

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• Collision Detection - Java - Rectangle

  - by Trizicus

  I would like to know if this is a good idea that conforms to best practices that does not lead to obscenely confusing code or major performance hit(s): Make my own Collision detection class that extends Rectangle class. Then when instantiating that object doing something such as Collision col = new Rectangle(); <- Should I do that or is that something that should be avoided? I am aware that I 'can' but should I? I want to extend Rectangle class because of the contains() and intersects() methods; should I be doing that or should I be doing something else for 2D collision detection in Java?

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• OutOfMemoryException - out of ideas II

  - by Captain Comic

  Hello, This question is related to my previous question. The storyline: I have an application which consumes a lot of memory if you look at task manager VMSize. I am trying to find out what consumes this amount of memory. You see in the picture below that VM size is 2,46 GB Ok now I am looking at .net performance counters Committed and reserved bytes add up to only 1,2 GB Now lets look at windb sos debugging. Let's run eeheap -gc command The heap size used by GC is only 340 MB. Where is the rest of used memory? I need to discover why WM size in TaskManager is 2.4 GB

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• Why not port Linux kernel to Common Lisp?

  - by rplevy

  Conventional wisdom states that OS kernels must be written in C in order to achieve the necessary levels of performance. This has been the justification for not using more expressive high level languages. However, for a few years now implementations of Common Lisp such as SBCL have proven to be just as performant as C. What then are the arguments against redoing the kernel in a powerfully expressive language, namely Common Lisp? I don't think anyone (at least anyone who knows what they are talking about) could argue against the fact that the benefits in transparency and readability would be tremendous, not to mention all the things that can't be done in C that can be done in Lisp, but there may be implementation details that would make this a bad idea.

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• SPWeb ProcessBatchData

  - by BeraCim

  Hi all: I'm currently using SPWeb's ProcessBatchData to update a lot of list items/folders into Sharepoint database. For example, in one batch update I have ~1200 objects to update. I also run it numerous times during different phases in my app. I found that it is generally faster and more efficient in updating large amount of items. But lately the performance of the app has decreased as more processes get added to the app (and also more batch updates). I was wondering whether the ProcessBatchData would be a suspect in slowing down the app? E.g. temporarily locking up db, draining resources, lagging network, etc. Thanks.

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• AccountManagement.UserPrincipal.Current takes 5 seconds

  - by Adel Hazzah

  I'm using the new .NET 3.5 System.DirectoryServices.AccountManagement API. In my code, I need to determine the current System.DirectoryServices.AccountManagement.UserPrincipal. My naive approach was to do this: using AccountManagement = System.DirectoryServices.AccountManagement; ... // Determine current UserPrincipal. // (On my machine, this blocks for 5 seconds) // AccountManagement.UserPrincipal principal = AccountManagement.UserPrincipal.Current; My computer is a stand-alone machine running Vista. I am not part of any domain, etc. Any ideas on how to improve the performance?

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• C# [Mono]: MPAPI vs MPI.NET vs ?

  - by Olexandr

  Hi. I'm working on college project. I have to develop distributed computing system. And i decided to do some research to make this task fun :) I've found MPAPI and MPI.NET libraries. Yes, they are .NET libraries(Mono, in my case). Why .NET ? I'm choosing between Ada, C++ and C# so to i've choosed C# because of lower development time. I have two goals: Simplicity; Performance; Cluster computing. So, what to choose - MPAPI or MPI.NET or something else ?

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• Too late to become a programmer?

  - by Tomas

  Hi, Working in IT for 5 years, I focused on system integration - testing, performance tests and analysis, automation etc. Altough I am working for one of the biggest IT companies, I have the possibility to come up with my own ideas and realize them - for example I have written C# (with SQL backend) bugtracker application with management elements...and I really liked it. I am very creative person but being 25 y/o, I am wondering whether it is too late. I understand the logic of programming but as I was never very good in math I assume I have no chance to become professional programmer in this age. What do you think? Thanks

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• WebLogic plugin within Eclipse

  - by Vani

  I am trying to start WebLogic within Eclipse When it starts it complains like this. Unable to load performance pack. Using Java I/O instead. Please ensure that wlntio.dll is in: 'C:\bea81\jdk142_04\bin;.;C:\WINDOWS\system32;C:\WINDOWS;C:\bea81\jdk142_04\jre\bin;C:\Program Files\Java\jre1.6.0\bin\client;C:\Program Files\Java\jre1.6.0\bin;C:\sybase\JS-12_5\bin;C:\sybase\OCS-12_5\lib3p;C:\sybase\OCS-12_5\dll;C:\sybase\OCS-12_5\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\Program Files\Common Files\Roxio Shared\DLLShared\;C:\Program Files\Common Files\Roxio Shared\DLLShared\;C:\Program Files\Common Files\Roxio Shared\9.0\DLLShared\;C:\Program Files\cvsnt;C:\Program Files\Executive Software\DiskeeperWorkstation\;'

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• How can I stop SQL Server Reporting Services 2008 going to sleep?

  - by Nick

  I have SSRS 2008 set-up on a server. All works fine except that if left inactive for a length of time the next time a request is made to the server it takes a long time for it to service it. I think this is to do with the worker process being shutdown after being idle for a certain length of time. However, as SSRS 2008 isn't managed through IIS I can't find any settings that I can adjust to stop this from happening. In IIS I'd go to the Performance tab of the Application Pool Properties and choose not to shutdown the worker process. How can I do this for SSRS 2008?

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• profiling WCF services with visual studio profiler

  - by ashish.s

  I am trying to profile a WCF service using visual studio profiler. So i created a profile by choosing asp.net application, and gave it the url of the web service. When i launch the session, it launches a web page to the site. I then run my unit test using another visual studio client, but the test always fails with with communication exception, and the process that performance analyze is attached to exits out. if i run the test again, it attached the process again, but the tests still fails with communication exception. This is throwing my report off since its only accounting for the startup work that the application is supposed to do. can someone point out what i am doing wrong ?

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• Difference between Thread.Sleep(0) and Thread.Yield()

  - by Xose Lluis

  As Java has had Sleep and Yield from long ago, I've found answers for that platform, but not for .Net .Net 4 includes the new Thread.Yield() static method. Previously the common way to hand over the CPU to other process was Thread.Sleep(0). Apart from Thread.Yield() returning a boolean, are there other performance, OS internals differences? For example, I'm not sure if Thread.Sleep(0) checks if other thread is ready to run before changing the current Thread to waiting state... if that's not the case, when no other threads are ready, Thread.Sleep(0) would seem rather worse that Thread.Yield().

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• SFML SetFramerateLimit Not Limiting Frame Rate

  - by Person

  Compiler: Visual C++ OS: Windows 7 Enterprise For some reason, Window::SetFramerateLimit isn't limiting the frame rate in the app I'm working on, but it works fine for others. The framerate is capped to 60, but mine jumps around at 100-99 and then goes down to 50 sometimes. It actually causes serious issues. For example, if I create many objects on screen, I'll see a heavy performance hit, whereas others report no change. Any ideas regarding why this is happening? If you need more information, I'd be happy to oblige. Thanks. P.S. I have strong reasons to believe that it is not simply a case of "their hardware is just more powerful than yours."

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