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Performance Requirements

performance requirements riskThe aim of this post is to outline how to determine and prioritise the key performance requirements within a project. I’ve already covered how important it is to have good performance requirements. These are the items that drive and determine the quality of the performance testing - but actually how do we best manage, assess and identify performance requirements?

Managing Performance Requirements

Lets take a step back first. I’ve often found that the person that best defines the performance requirements is usually the performance tester. This is in contrast to the business analysis or the stakeholders defining them. Why? A number of reasons - the main being time and accuracy.

Here’s a typical conversation:

Web Server Performance Benchmarks

G-WAN Rules in Static Benchmark Test Battery

Over at his blog Spoot!, Nicolas Bonvin recently posted two summaries of the great work he's done benchmarking how well various open-source and free Web servers dish up static content under high loads. Bonvin, a PhD. student at the …cole polytechnique fÈdÈrale de Lausanne (EPFL in Switzerland, specializes in high-volume distributed data systems, and brings considerable expertise and real-world experience to bear in designing his tests.

First Round of Performance Testing

In his first post, Bonvin laid out the evidence he'd accumulated by running benchmark tests against six Web servers: Apache MPM-worker, Apache MPM-event, Nginx, Varnish, G-WAN, and Cherokee, all running on a 64-bit Ubuntu build. (All Web servers used, save for G-WAN, were 64-bit.) This first set of benchmarks was run without any server optimization; each server was deployed with its default settings. Bonvin measured minimum, maximum, and average requests per second (RPS) for each server. All tests were performed locally, eliminating network latency from the equation.

On this initial test battery, G-WAN was the clear winner on every conceivable benchmark, with Cherokee placing second, Nginx and Varnish close to tied, and both strains of Apache coming in dead last. As Bonvin notes, it wasn't even close. G-WAN, a small Web server built for high performance, completed 2.25 more requests per second than Cherokee (its closest competitor), and served a whopping 9 to 13.5 more requests per second than the two versions of Apache.

Web Performance Tuning = 10% Profit Increase

Your website is a little slow - so what? Well, it is probably costing you money. I have been researching published facts about web performance because we are always trying to understand our industry better. This post should help you realize that improving your web application performance can directly impact your bottom line by 10% or more. Don't believe me? Read on...

Response Over 6 Seconds is the Top of Your List?!

I read an article today on the E-commerce Times site Web Performance Metrics That Matter. It was the first result in a Google search on "web performance metrics", and the title sounded like a perfect hit. My intent was to see what other people think are the best performance metrics.

Here is a paragraph that really surprised me:

Performance Testing Kills GM?

There are some excellent stats gathered about performance testing at this resource site.

I especially like the one that states 5 second response time is the cutoff point for the business doing well. If the app takes longer than 5 sec to respond, the company employees start to get frustrated. It makes sense to me that productivity will go down. That not only leads to unhappy employees, it invariably leads to lost customers and lost profits.

Web Performance - 15 Tips from NETTUTS

An article caught my attention because I follow the author on Twitter. Two days ago, Jeffery Way published 15+ Tips to Speed Up Your Website, and Optimize Your Code!

Optimizing MSSQL Queries

For most developers, worrying about optimization when writing SQL queries is not an issue until performance becomes a problem with an application. Although SQL query optimization is important, it can be seen as a tedious process that some programmers fail to follow thoroughly. Some best practices can be observed during the development process that will help maximize performance for future application scalability.

Use SELECT Instead of Using SELECT *

MSSQL Performance Tuning, the Hardware

engine performanceSQL Server performance tuning is usually left until problems arise. Most of the time developers and even database administrators only focus on the tuning elements of their MSSQL servers when performance starts to become slow and adversely affects users. Although the typical reason for slow issues is configuration or development issues (poor stored procedure design), occasionally hardware can be an issue.

Improve Your Site Performance with YSlow for Firefox

Measuring performanceEven with the most bandwidth possibly available, an inefficient content delivery design can bring a Web 2.0 application to its knees. Nothing turns off potential users like a page that loads too slowly. This is a critical concern when designing any application, but it is a requirement that must be carefully balanced against the need to provide a content rich environment. The two goals are often opposed, but with careful design, both requirements can be successfully met.

Performance Test Tools

This is quite a list of open source performance testing tools. While there are definitely some excellent products on this list, there are also many (perhaps most) which fall into the category of poor to mediocre. As is the case with any open source category, these were developed by programmers who generally develop something for their own use, without documentation and very specific application. The most popular according to this page are:

  • Apache JMeter
  • OpenSTA
  • WebLOAD

Load Balancing in ASP.NET

For large companies, load balancing is an important feature to use to increase performance. Large companies with the available resources will use web farms. Web farms give your applications the ability to use multiple servers for resources more commonly known as pooling resources. Load balancing helps distribute user requests through a dispatch application that redirects to the different web farm servers.

balancing load

.NET Load Balancing and Windows 2003

If your web server is starting to lose performance and resources are lacking, it may be time to implement a web farm. A web farm will pool sources and allow your web server to share its resources with another high powered machine. It can greatly increase web form performance and rid some of the end user frustration of timeouts and slow responses.

Microsoft SQL and Load Balancing

Microsoft SQL Server 2000 and Microsoft SQL Server 2005 do not inherently support load balancing out of the box like most information technology experts might think. They have intrinsic tools that allow for scalability and load balancing, however, they do not have the defined load balancing functions that are commonly known among network administrators. Instead, Microsoft SQL Server 2005 comes with some tools to help with scalability and performance for your enterprise organization.

Microsoft Clustering Services (MSCS)

Software Testing with LoadRunner

HP LoadRunnerLoadRunner (now called HP LoadRunner, since HP bought Mercury Interactive) is one of the most popular software automation and testing programs on the market. It is a comprehensive testing program that gives webmasters and developers the ability to test the functionality and load managing ability of their website. There are many reasons why LoadRunner is so popular and why it is a good choice as a software testing tool for your website.

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"LoadStorm I love you and I am gladly going to pay for your services!" - Bernardo Rivas Carillo, Software Development Engineer in Test, Wirestone

"Excellent product – quick and easy to set up, great analytics tools, and affordable." - Mislav Kos, Application Developer, Soliant Consulting

"I’m finding this a great tool overall." - Nick Taliadoros, QA Manager, Cellectivity

"We can only wish that more of our vendors would be so responsive and accommodating as LoadStorm." - Miguel Picornell, VP Operations, Optaros, Inc.

"Great load testing tool! It's exactly what we need. I think the world of the service!" - Rafael Santander, Performance Engineer, OffandAway.com

"LoadStorm...awesome product!" - Kaine Escott, CEO, Harvey Norman Big Buys

"Thank you alot! LoadStorm is essential for us to ensure the best performance & scalability." Claudio Bianchi, CEO, FreeSharewareDepot

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