Performance tool for MySQL
Ciao, I'm looking for performance tool for testing of load in terms of data and number of users,better if they are open source Thanks Andrea ...
performance
jQuery UI Sortable connectWith Load Time Performance on a Calendar
jQuery UI Sortable + Draggable 1.6rc5 WHAT I AM DOING: Creating a calendar with varying date ranges (ex: could be 1 week displayed, could be 20 weeks displayed). This calendar has events in each day, and the events are sortable within the day itself, as well as between all other days on the visible calendar. My average calendar date r...
Why can't this be optimized?
I have a function that I use to add vectors, like this: public static Vector AddVector(Vector v1, Vector v2) { return new Vector( v1.X + v2.X, v1.Y + v2.Y, v1.Z + v2.Z); } Not very interesting. However, I overload the '+' operator for vectors and in the overload I call the AddVector function to avoid code duplica...
Caching Lucene.net search results
I've used Lucene.net to implement search functionality (for both database content and uploaded documents) on several small websites with no problem. Now I've got a site where I'm indexing 5000+ documents (mainly PDFs) and the querying is becoming a bit slow. I'm assuming the best way to speed it up would be to implement caching of some ...
Why is IronPython faster than the Official Python Interpreter
According to this: http://www.codeplex.com/IronPython/Wiki/View.aspx?title=IP20VsCPy25Perf&referringTitle=IronPython%20Performance IronPython (Python for .Net) is faster than regular Python (cPython) on the same machine. Why is this? I would think compiled C code would always be faster than the equivalent CLI bytecode. ...
Has anyone actually implemented a Fibonacci-Heap efficiently?
Has anyone of you ever implemented a Fibonacci-Heap? I did so a few years back, but it was several orders of magnitude slower than using array-based BinHeaps. Back then, I thought of it as a valuable lesson in how research is not always as good as it claims to be. However, a lot of research papers claim the running times of their algori...
Escape HTML to PHP or Use Echo? Which is better?
In terms of performance , what would be better. Using PHP to echo all the HTML output so I can pepper it with the various bits of working code and variables or escape HTML to php periodically throughout the documents. I know there may be some readability issues but I'm not to worried about that. Thanks all! Example 1 echo '<html>', ...
What free, low-overhead (statistical) profilers one can use under Linux?
Preferably from Ubuntu repositories. ...
How to accurately measure clock cycles used by a c++ function?
I know that I have to use: rdtsc. The measured function is deterministic but the result is far from being repeatable (I get 5% oscillations from run to run). Possible causes are: context switching cache misses Do you know any other causes? How to eliminate them? ...
Working around UDF Performance Issues - Manual caching
My system does some pretty heavy processing, and I've been attacking the performance in order to give me the ability to run more test runs in shorter times. I have quite a few cases where a UDF has to get called on say, 5 million rows (and I pretty much thought there was no way around it). Well, it turns out, there is a way to work aro...
Why is thread local storage so slow?
I'm working on a custom mark-release style memory allocator for the D programming language that works by allocating from thread-local regions. It seems that the thread local storage bottleneck is causing a huge (~50%) slowdown in allocating memory from these regions compared to an otherwise identical single threaded version of the code,...
Why is float division slow?
What are the steps in the algorithm to do floating point division? Why is the result slower than say, multiplication? Is it done the same way we do division by hand? By repeatedly dividing by the divisor, subtracting the result to obtain a remainder, aligning the number again and continuing till the remainder is less than a particular ...
Software performance (MCPS and Power consumed) in a Embedded system
Assume an embedded environment which has either a DSP core(any other processor core). If i have a code for some application/functionality which is optimized to be one of the best from point of view of Cycles consumed(MCPS) , will it also be a code, best from the point of view of Power consumed by that code in a real hardware system? ...
Is there any guarantee of alignment of address return by C++'s new operation?
Hi, Most of experienced programmer knows data alignment is important for program's performance. I have seen some programmer wrote program that allocate bigger size of buffer than they need, and use the aligned pointer as begin. I am wondering should I do that in my program, I have no idea is there any guarantee of alignment of address r...
multithread performance problem for web service call
Hello everyone, Here is my sample program for web service server side and client side. I met with a strnage performance problem, which is, even if I increase the number of threads to call web services, the performance is not improved. At the same time, the CPU/memory/network consumption from performance panel of task manager is low. I a...
Does Foreign Key improve query performance?
Suppose I have 2 tables, Products and ProductCategories. Both tables have relationship on CategoryId. And this is the query. select p.ProductId, p.Name, c.CategoryId, c.Name AS Category from Products p inner join ProductCategories c on p.CategoryId = c.CategoryId where c.CategoryId = 1; When I create execution plan, table ProductCateg...
open source Tool for stress testing, load testing and performance testing
Possible Duplicate: How do you stress test a web application? Currently I have configured a project with cc.net, watin and nunit and now I want to do stress, load, and performance testing of my .net projects. Any idea which opensource tool should I use or cani achive it with same working tools and if yes then how? ...
Overhead for native interop using only primitive types
I am considering porting a small portion of the code in a C# project of mine to C/ASM for performance benefits. (This section of code uses many bitwise operations and is one of the few places where there may exist a real performance increase by using native code.) I then plan to simply call the native function in the separate DLL via P/I...
A backup persistence store. What are my options ?
I have a service that accepts callbacks from a provider. Motivation: I do not want to EVER lose any callbacks (unless of course my network becomes unreachable). Let's suppose the impossible happens and my mysql server becomes unreachable for some time, I want to fallback to a secondary persistence store once I've retried several times ...
Something faster than HttpHandlers?
What is the fastest way to execute a method on an ASP.NET website? The scenario is pretty simple: I have a method which should be executed when a web page is hit. Nothing else is happening on the page, the only rendered output is a "done" message. I want the processing to be as fast as possible. Every single hit is unique, so caching i...