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Confused about the subtle differences between a stress test, performance test or a load test? Don’t get lost in the technobabble! Altentee uses the following terminology to help describe the different types of tests we conduct: Shakeout – single script, single user, low volume scenarios whose main purpose is to confirm a correctly configured test harness [...] On a basic level, the honeybee’s dilemma is a tale of two flower patches. If one patch is yielding better nectar than the other, how can the hive use its workforce most efficiently to retrieve the best supply at the moment? The solution, which earned Austrian zoologist Karl von Frisch a Nobel Prize, is a [...] This video is a play on Pascal’s Wager which really gets you thinking on possible outcomes for a given scenario being climate change … Is it a better bet to accept doomsday predictions for climate changes, or rest on our haunches and let the world pass by? If you haven’t thought about it yet, get [...] Recently I have been trying to determine what the impact of using MQ message persistence is on disk subsystem performance. There is alot of literature from IBM recommending ideal configurations to support MQ persistence, so I won’t turn this into a post that recommends ideal settings. What I did want to achieve though, was to [...] So I spent the best part of a day assisting our sys admin and developer resolve MQ errors that a COBOL client was throwing when opening more than one concurrent connection to a clustered queue manager. Because the architecture had recently changed to a cluster, and my load harness was no longer getting the desired response [...] Statistics (and the ability to gather/present) are an essential tool for performance testing. At the time of learning basic stats in high school and university I was plagued with the problem of not seeing the real life application of these tools. Sure, exercises and scenarios conducted simulated real life, but in reality, the meaning of [...] Once again on the topic of performance testing Business Objects, when executing a benchmark for a web intelligence report with goal being to see how many concurrent users it could support, the following error mesage was being generated in the vuser log: Connection failed. The server has reached the maximum number of simultaneous connections. (Error: RWI [...] Recently I wrote a test harness that had a “discovery” mode. That is, given a target service level agreement (SLA), what transaction pacing or throughput did the load harness have to apply in order to achieve the SLA response times. Now my maths is a tad scratchy, but I knew that I could somehow figure out the equation to determine how much the load balancer should adjust throughput in order to achieve the desired response time. In my mind I pictured a horizontal line that is the target, and a sinusoidal line that is the actual response time that varies according to load. If I could just figure out how to dampen that curve, I would have the magic [...] |
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