When displaying images on our website, we check if the file exists with a call to file_exists(). We fall back to a dummy image if the file was missing. However, profiling has shown that this is the slowest part of generating our pages with file_exists() taking up to 1/2 ms per file. We are only testing 40 or so files, but this still pus...
Hi, In my recent project which is using Asp.net Mvc 2, we found that the DisplayFor has performance issue. I'm not so sure whether it is the real issue or did I miss something? I hope some Asp.net Mvc Guru can explain it to me. :) Model. public class Customer { public int CustomerId { get; set; } public string Name { get; set;...
Given a straightforward user-driven, high traffic web application (no fancy reporting/BI): If my utmost goal is performance (not ease of maintainability, ease of queryability, etc) I would surmise that in most cases, a roll-yourown DAL would be the best choice. However, if i were to choose Linq2SQL or NHibernate, roughly what kind of ...
I am writing a game in AS3 and have, as an example, around 40 objects on screen. Let's say they are clouds. I'm wondering which of the two paths would be less a strain on system resources: a) Put an eventListener on each object and have it update itself, or b) Loop through the array and manually update each object Or is the performanc...
Optimizing SQLite is tricky. Bulk-insert performance of a C application can vary from 85 inserts-per-second to over 96 000 inserts-per-second! Background: We are using SQLite as part of a desktop application. We have large amounts of configuration data stored in XML files that are parsed and loaded into an SQLite database for further p...
I know there are several questions asking the same question "Why should I use release mode". The problem I have with the answers is that they simply state, quite strongly, that you should always use release mode when a website is in production. Why? I understand that the code is optimised in the assemblies, but to what level? Is it go...
Hi folks, I need to store a 2d matrix containing zip codes and the distance in km between each one of them. My client has an application that calculates the distances which are then stored in an Excel file. Currently, there are 952 places. So the matrix would have 952x952 = 906304 entries. I tried to map this into a HashMap[Integer, Fl...
Does anyone know of a tool that can help me figure out why we are seeing runaway CPU in a managed app? What I am not looking for: Process explorer, it has this awesome feature that lets you see CPU per thread, but you do not get managed stack traces. Also, it requires a fairly proficient user. Windbg + SOS, it could probably be used ...
I have a project using Javascript parse json string and put data into div content. In this case, all of itemname variables is the same div's id. If variable i about 900, I run this code in Firefox 3 for <10ms, but it run on IE 7 for >9s, IE process this code slower 100 times than Firefox I don't know what happen with IE ? If I remove...
We are experiencing performance issues when using windows 2008 r2 to serve our web site. It seems to consume more than twice the % processor time and serves requests half as fast as a windows 2008 32bit server on the equivalent 64 bit compatible hardware (HP Blade BL465c). To further examine the performance issue, we wrote a very simp...
Hi, could anyone tell me if it makes a difference to Oracle 10g whether I use: SELECT col1 FROM myTable WHERE col2 = 'someval' AND col3 = "someotherval" or SELECT col1 FROM SELECT col1, col2, col3 FROM ( SELECT * FROM myTable ) WHERE col2 = 'someval' ) WHERE col3 = "someotherval" According to the explain plan, the...
Hello everyone, For the life of my, I can't figure out this performance hit in my code. I have a container object where I measure how long it takes to run the constructor (object below), timing code in the public constructor public class WorkUnit : IWorkUnit { private JobInformation m_JobInfo; private MetaInfo m_MetaInfo; ...
I have been tasked with looking for a performance testing solution for one of our Java applications running on a Weblogic server. The requirement is to record production requests (both GET and POST including POST data) and then run these requests in a performance test environment with a copy of the production database. The reasons for u...
I was wondering if there is any difference in performance when you compare/contrast A) Allocating objects on the heap, putting pointers to those objects in a container, operating on the container elsewhere in the code Ex: std::list<SomeObject*> someList; // Somewhere else in the code SomeObject* foo = new SomeObject(param1, param2); ...
I have a few 3D meshes in my WPF application, and I need to add some animations to them, not the typical animations, but rather a sequence of PNG images for creating a graphical animation. Think of it like I need to add a cartoon animation to the side of a Cube. I know very well about the Viewport2DVisual3D, but when I replace my norma...
Hi everyone! I have to develop one program that consists Data manipulation (Retrieve data, Update Data and New insert data) to multiple tables. Which will be suitable approach and faster in performance using DataSet Object and Storeprocedure with CURSOR object? Please point me out. Thanks you all! ...
I'm using the c++ STL heap algorithms, and I wrote a wrapper class around it so I could do some other stuff. When I tried to use the code below, for example: //! Min-heap wrapper class. class FMMHeap{ public: FMMHeap(Vector &phi) : _phi(phi) {} bool operator()(unsigned p1, unsigned p2) {return fabs(_phi(p1)) > fabs(_phi(p2)); }...
Hi guys I need your opinion.I am in a situation where I need to use ajax so I need to query users info every 30 seconds.....which is more efficient query the server first(say check a text file first) and if there is an update for a user info, do a full blown database query or just directly query the database directly every 30 seconds.Ple...
Hi Given that I have the appropriate rights, how can I get performance data (ie. 'Pages/Sec', 'Avg. Disk Queue' and so on) from a remote computer? Basically I want to write a function like this: function GetPerformanceData(aComputerName, aPerformanceIndicator: string): variant; It is preferably (of course) to work out of the box on ...
I have to use Hibernate and retrieve data from Oracle but the problem is, that the number of parameters passed to the query is not always the same. For the sake of simplicity let's consider the following query: select COL_1, COL_2, ..., COL_N from TAB_1 where COL_1 in (?, ?, ... ?) The number of parameters passed to in clause is betwe...