Tag Archive | "Network Emulation"
Getting Accurate Results from Scalability Testing
None of us want our sites to crash like the Chase site outage in mid September. I’m not privy to the details of that site crash, but I can tell you that many sites degrade under peak user traffic unexpectedly and eventually crash. Why? It’s often incorrectly performed scalability tests. Over the years, I’ve met [...]
Continue reading...LoadRunner and the Cloud – It’s here!!
Wednesday, May 19, 2010
HP today announced an agreement with Amazon Web Services that enables you to run HP LoadRunner v9.5 in Amazon EC2. The project is currently in beta, so it’s limited to the East US EC2 region, but does already include pre-built AMIs for your Controller (250 VUs) and any size of Load generator (32 or 64 [...]
Continue reading...WAN Emulation vs WAN Simulation
Wednesday, December 30, 2009
One of the topics we are frequently asked is to explain or clarify the difference between WAN Emulation and WAN Simulation. WAN Simulation methodology is a set of theoretical algorithms which are usually applied on a trace file. These algorithms aim to predict applications response times with different conditions and then applied to the captured [...]
Continue reading...Improving the Quality for the End User
Monday, December 21, 2009
One student at a time… Recently, I visited a company that develops and distributes software for Independent School District’s across USA. Their main product, originally developed for challenged kids, centers around dynamic computerized teaching and testing programs. This product proved to be so successful among this population that the company adapted it for other kids [...]
Continue reading...Impact of Latency on Cloud Computing
Tuesday, December 8, 2009
The new buzzword around the IT block is “Cloud Computing”, the ability to avoid deploying costly infrastructure on each location by contracting a “virtual” infrastructure environment from dedicated vendors. Need to expand? Just call your provider and double your server capacity and triple your storage. However, we may need to apply a sobriety test, where [...]
Continue reading...Building Applications for a Remote Datacenter Part 2 Application Efficiency Metrics
Thursday, November 5, 2009
In the previous post we identified the Wide Area Network and the impairments that it introduces as a key reason for why a local user (let’s say in NYC) experiences a faster application than a user that is remote to his datacenter (let’s say in Tokyo). I also presented a question to the group: “We [...]
Continue reading...Hosted Load Testing II
Friday, October 30, 2009
My friend Mark Tomlinson from HP recently wrote an informative blog about “Understanding the language of hosted load testing.” The blog touched on two competing approaches to application performance testing that were referenced as “behind the firewall” and “outside the firewall”. Behind the firewall testing usually means testing in a lab environment such as a [...]
Continue reading...Building Applications for a Remote Datacenter Part 1. The network impact
Tuesday, October 13, 2009
This series of posts is about the day after a data center move. Now that the data center is remote, how does this paradigm shift impact the way we should develop, test, deploy, monitor and troubleshoot applications. I will try to cover as many topics as possible, but the main focus is still going to be around the role application performance management plays in this new paradigm.
Continue reading...Analyzing and remediating latency sensitive applications part 2 Oracle Clinical
Thursday, September 17, 2009
In the previous post http://www.shunra.com/shunrablog/index.php/2009/08/14/data-center-relocation-questions-and-answers-part-1/ I presented an example of a common performance problem with applications that host executables on a remote shared drive. As common as that problem is, it is usually a legacy problem, most new applications follow a more best practices architecture usually involving a web based front end for the application. [...]
Continue reading...Is Microsoft Quietly Providing an Alternative to WAN Acceleration
Friday, September 4, 2009
As part of our service offerings at Shunra’s professional services, we help our clients analyze the performance ROI of WAN acceleration. We also wrote a best practices paper about it here http://www.shunra.com/uploads/pdf/WAN-acceleration-whitepaper-031909.pdf. Which is why I was very interested in learning about 2 new developments from Microsoft. These developments provide improved performance for branch office [...]
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Thursday, October 21, 2010
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