Introduction to Performance Testing
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Performance testing determines how responsive and stable a system is under different workloads. It tests for speed, scalability, stability, and ensures a positive user experience. Types of performance testing include load testing to evaluate behavior under expected loads, and stress testing to find upper capacity limits. Key metrics measured are response time, throughput, and resource utilization. Performance testing involves planning test goals, methodology, implementation, validation of results, and interpreting results. Common tools used for performance testing are JMeter, LoadRunner, and Webload.
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Introduction to Performance Testing
- 1. Performance Testing By Tharinda Liyanage
- 2. What is Performance Testing Testing to determine how a system performs in terms of responsiveness and stability under a particular workload. It can also serve to investigate scalability, reliability and resource usage.
- 3. Why we do performance testing To demonstrate that the system meets performance criteria. To compare two systems to find which performs better. To measure what parts of the system or workload causes the system to perform badly. Speed - Does the application respond quickly enough for the intended users? Scalability Will the application handle the expected user load and beyond? (AKA Capacity) Stability Is the application stable under expected and unexpected user loads? (AKA Robustness) Confidence Are you sure that users will have a positive experience on go-live day?
- 4. Types of testing Load Testing behavior of the system under a specific expected load Concurrency Speed/Throughput Stress Testing the upper limits of capacity within the system Scalability/Stability
- 5. Types of testing Benchmark testing Compare competitive product Check performance with previous builds
- 6. What we measure Response time User concerns Throughput Business concerns Resource utilizations System concerns
- 7. Phases of Performance Testing Project assessment Goals/Scoping: What do you want to achieve? Methodology/Planning How do you plan to achieve it? Implementation/Execution Doing what you planned Validation/Evaluation Did you achieve your goals? Results/Interpretation What does the output of the testing mean?
- 8. Tools Free/Open source tools Other useful tools JMeter Httpwatch Commercial tools YSlow Load Runner Webload
Editor's Notes
- #4: To check compliance with requirementsTo evaluate release readinessTo asses user satisfactionTo assist performance tuningTo estimate capacityTo validate assumptionsTo generate marketing statements
- #5: Load testingLoad testing is the simplest form of performance testing. A load test is usually conducted to understand the behaviour of the system under a specific expected load. This load can be the expected concurrent number of users on the application performing a specific number of transactions within the set duration. This test will give out the response times of all the important business critical transactions. If the database, application server, etc. are also monitored, then this simple test can itself point towards any bottlenecks in the application software.Stress testingStress testing is normally used to understand the upper limits of capacity within the system. This kind of test is done to determine the system's robustness in terms of extreme load and helps application administrators to determine if the system will perform sufficiently if the current load goes well above the expected maximum.
- #6: A performance benchmark test will give a repeatable set of quantifiable results from which present and future releases for specific functionality can be reliably compared or baselined against.
- #8: What must be achieved? (Business problem to solve)Number of usersAcceptable response timesBusiness processes to testBaselinesData volumesArchitecture / Platform Are you familiar with the architecture?Do you have experience with thearchitecture?System components (Hardware &Software)Test environment Suitable for performance testing?HardwareSoftwareWhich tool will be used? Are you familiar with the tool?Is the tool compatible with the architecture?Hardware & software requirements for toolinstallation and use