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Step 8 - Analyze the Results
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You can analyze the test results to find performance bottlenecks between each test run or after all testing has been completed. Analyzing the results correctly requires training and experience with graphing correlated response time and system data. The following are the steps for analyzing the data: 1. Analyze the captured data and compare the results against the metric s accepted level to determine whether the performance of the application being tested shows a trend toward or away from the performance objectives. 2. Analyze the measured metrics to diagnose potential bottlenecks. Based on the analysis, if required, capture additional metrics in subsequent test cycles. For example, suppose that during the first iteration of load tests, the process shows a marked increase in memory consumption, indicating a possible memory leak. In the subsequent iterations, additional memory counters related to generations can be captured to study the memory allocation pattern for the application.
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Load testing helps to identify the maximum operating capacity of the application and any bottlenecks that might be degrading performance. The basic methodology for performing load testing on a Web application is to identify the performance-critical key scenarios; identify the workload profile for distributing all the load among the key scenarios; identify metrics that you want to collect in order to verify them against your performance objectives; create test cases that will be used to simulate the load test; use tools to simulate the load according to the test cases and capture the metrics; and finally, analyze the metrics data captured during the tests.
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18 Stress Testing Web Applications Objectives
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Understand the key concepts of stress testing. Learn how to stress-test a Web application.
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Stress testing is a type of performance testing focused on determining an application s robustness, availability, and reliability under extreme conditions. The goal of stress testing is to identify application issues that arise or become apparent only under extreme conditions. These conditions can include heavy loads, high concurrency, or limited computational resources. Proper stress testing is useful in finding synchronization and timing bugs, interlock problems, priority problems, and resource loss bugs. The idea is to stress a system to the breaking point in order to find bugs that will make that break potentially harmful. The system is not expected to process the overload without adequate resources, but to behave (e.g., fail) in an acceptable manner (e.g., not corrupting or losing data). Stress tests typically involve simulating one or more key production scenarios under a variety of stressful conditions. For example, you might deploy your application on a server that is already running a processor-intensive application; in this way, your application is immediately starved of processor resources and must compete with the other application for processor cycles. You can also stress-test a single Web page or even a single item such as a stored procedure or class. This chapter presents a high-level introduction to stress-testing a Web application. Stress testing can help you identify application issues that surface only under extreme conditions.
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Examples of Stress Conditions
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Examples of stress conditions include: Excessive volume in terms of either users or data; examples might include a denial of service (DoS) attack or a situation where a widely viewed news item prompts a large number of users to visit a Web site during a three-minute period. Resource reduction such as a disk drive failure. Unexpected sequencing. Unexpected outages/outage recovery.
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Examples of Stress-Related Symptoms
Examples of stress-related symptoms include: Data is lost or corrupted. Resource utilization remains unacceptably high after the stress is removed. Application components fail to respond.
Unhandled exceptions are presented to the end user.
How to Use This
Use this chapter to understand the key concepts of stress testing and the steps involved in stress-testing a Web application. To get the most from this chapter: Use the Input and Output sections to understand the key inputs for stress-testing a Web application and the key outcomes of this type of testing. Use the Approach for Stress Testing section to get an overview of the approach for stress-testing a Web application, and as quick reference guide for you and your team. Use the various steps sections to understand the details of each step involved in stress-testing a Web application. Use the Usage Scenario for Stress Testing section to understand various real-world scenarios where stress testing is employed.
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