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To perform stress testing, you are likely to use as reference one or more of the following items: Results from previous stress tests Application usage characteristics (scenarios) Concerns about those scenarios under extreme conditions Workload profile characteristics Current peak load capacity (obtained from load testing) Hardware and network architecture and data Disaster-risk assessment (e.g., likelihood of blackouts, earthquakes, etc.)
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Output from a stress test may include: Measures of the application under stressful conditions Symptoms of the application under stress Information the team can use to address robustness, availability, and reliability
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Approach for Stress Testing
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The following steps are involved in stress-testing a Web application: 1. Step1 - Identify test objectives. Identify the objectives of stress testing in terms of the desired outcomes of the testing activity. 2. Step 2 - Identify key scenario(s). Identify the application scenario or cases that need to be stress-tested to identify potential problems. 3. Step 3 - Identify the workload. Identify the workload that you want to apply to the scenarios identified during the Identify objectives step. This is based on the workload and peak load capacity inputs. 4. Step 4 - Identify metrics. Identify the metrics that you want to collect about the application s performance. Base these metrics on the potential problems identified for the scenarios you identified during the Identify objectives step.
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5. Step 5 - Create test cases. Create the test cases in which you define steps for running a single test, as well as your expected results. 6. Step 6 - Simulate load. Use test tools to simulate the required load for each test case and capture the metric data results. 7. Step 7 - Analyze results. Analyze the metric data captured during the test. These steps are graphically represented below; the following sections discuss each step in detail.
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Figure 18.1 Stress Testing Steps
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Step 1 - Identify Test Objectives
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Asking yourself or others the following questions can help in identifying the desired outcomes of your stress testing: 1. Is the purpose of the test to identify the ways the system can possibly fail catastrophically in production 2. Is it to provide information to the team in order to build defenses against catastrophic failures 3. Is it to identify how the application behaves when system resources such as memory, disk space, network bandwidth, or processor cycles are depleted
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4. Is it to ensure that functionality does not break under stress For example, there may be cases where operational performance metrics meet the objectives, but the functionality of the application is failing to meet them orders are not inserted in the database, the application is not returning the complete product information in searches, form controls are not being populated properly, redirects to custom error pages are occurring during the stress testing, and so on.
Step 2 - Identify Key Scenario(s)
To get the most value out of a stress test, the test needs to focus on the behavior of the usage scenario or scenarios that matter most to the overall success of the application. To identify these scenarios, you generally start by defining a single scenario that you want to stress-test in order to identify a potential performance issue. Consider these guidelines when choosing appropriate scenarios: Select scenarios based on how critical they are to overall application performance. Try to test those operations that are most likely to affect performance. These might include operations that perform intensive locking and synchronization, long transactions, and disk-intensive input/output (I/O) operations. Base your scenario selection on the specific areas of your application identified as potential bottlenecks by load-testing data. Although you should have fine-tuned and removed the bottlenecks after load testing, you should still stress-test the system in these areas to verify how well your changes handle extreme stress levels. Examples of scenarios that may need to be stress tested separately from other usage scenarios for a typical e-commerce application include the following: An order-processing scenario that updates the inventory for a particular product. This functionality has the potential to exhibit locking and synchronization problems. A scenario that pages through search results based on user queries. If a user specifies a particularly wide query, there could be a large impact on memory utilization. For example, memory utilization could be affected if a query returns an entire data table.
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