Rational Performance Tester | Top Q&A

What is Rational Performance Tester?

Contents

IBM Rational Performance Tester (RPT) is a performance testing tool that measures the performance of an IT system by putting a load on it and measuring its response time under load. RPT generates load by simulating the actions on the system of many concurrent users. The key performance metrics are transaction response times and throughput. Transaction response time is the time it takes the system to respond to a user action, such as navigating from one page to another in a web application. Throughput is the number of transactions (such as navigation) that the system can perform in a given time. RPT is one of the tools our software lifecycle experts use to automate the entire software lifecycle.Read: what is a reasonable performance checker

What does Rational Performance Tester do?

Read more: Vigilant Volumes: What They Are and Where They Come From RPT creates load on the system by simulating the actions of multiple concurrent users. Each user is emulated by a thread that runs a simple program called a script. In RPT, scripts created by recording user actions are tested. At the end of the recording, the script is generated automatically. Unlike other load testing tools (including Micro Focus LoadRunner), an RPT script is not displayed as a block of code, but as a sequence of graphical symbols. The script can then be run by multiple threads to simulate the actions of multiple users. The commands to be measured are specified in the script. While the test is running, RPT also measures the throughput and metrics of the servers of the system under test, such as CPU usage, memory usage, and disk I/O. To generate high loads, RPT can use multiple machines to run simulated users (load generators or load injectors). More than one script can be run concurrently during the test. For example, in an experiment with 1000 users simulated, 500 users can run script A, 300 users can run script B, and 200 users can run script C. The three scripts will simulate simulate different user activities on the system, and the ratio of each script run by the simulated user will be designed to reflect the observed usage of real users on the system. of users) and total throughput peaked. RPTs can measure loads at which response times reach unacceptably high levels.

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Benefit

The main benefits of Rational Performance Tester are as follows.

  • Consistent performance is an important part of the usability of an IT system. If a system is too slow, user productivity may suffer, and if the system is customer-oriented, users may switch to competing systems. In both cases there is a direct adverse financial effect on the system owner. RPT helps prevent this.
  • Certain errors appear only on load, for example a memory leak. A memory leak occurs if memory is allocated in a program but not all memory is freed when it is no longer needed. Under load, the system will gradually run out of memory and crash. RPT can help detect and resolve memory leaks.
  • Other system resources, such as database connections, can also be exhausted and similarly cause the system to fail. Memory leaks and other resource exhaustion problems often show up in soak tests (also known as stability tests). A water immersion test is a performance test performed over an extended period of time, usually from a few hours to a few days.
  • Performance testing is useful for future capacity planning. Even when the system is fully operational at expected loads, it can be useful to know at what load the system will eventually fail, so that it can be planned to increase its capacity as usage increases. usage increased. This is determined in a stress test, a test in which the load is gradually increased until the system fails.

Featured

Rational Performance Tester includes the following features: Read more: What do limits mean in football

  • RPT is implemented in Eclipse, IBM’s highly extensible integrated development environment.RPT RunningTest
  • In common with most other performance testing tools, RPT works by recording network traffic between client and server and replaying this traffic in multiple concurrent threads during testing.
  • RPT is used primarily on web-based systems (whether internet or intranet) and also includes other protocols such as Sockets and IBM 3270. RPT also allows users to have the necessary skills to develop develop their own plugins to test other protocols.
  • RPT is particularly strong at the correlation level. Correlation is the process of identifying and storing variables sent by the server, such as session IDs, and reusing them later during testing. Failure to correlate causes scripts to fail through invalid session IDs or similar errors. In RPT, the tester needs to do very little manual correlation. In many tests, no manual correlation is required.
  • The scripts are represented as a sequence of graphical objects (shown in the screenshot), each representing a step of the script. User modifications are made by changing the properties of the relevant object. This should be enough for most situations, but when more complex processing is required, it is possible to write a code module and call it from an object in the script. These code modules are written in Java.
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