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The following are useful inputs for load-testing a Web application: Performance-critical usage scenarios Workload models Performance acceptance criteria Performance metrics associated with the acceptance criteria Interview feedback from the designer or developer of the Web application Interview feedback from end users of the application Interview feedback from the operations personnel who will maintain and manage the application
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The main outcomes that load testing helps you to accomplish are: Updated test plans and test designs for load and performance testing Various performance measures such as throughput, response time, and resource utilization Potential bottlenecks that need to be analyzed in the white-box testing phase The behavior of the application at various load levels
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Approach for Load Testing
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The following steps are involved in load-testing a Web application: 1. Step 1 - Identify performance acceptance criteria 2. Step 2 - Identify key scenarios 3. Step 3 - Create a workload model 4. Step 4 - Identify the target load levels 5. Step 5 - Identify metrics 6. Step 6 - Design specific tests 7. Step 7 - Run tests 8. Step 8 - Analyze the results These steps are graphically represented below. The sections that follow discuss each step in detail.
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Figure 17.1 Load Testing Steps
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Step 1 - Identify Performance Acceptance Criteria
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Identifying performance acceptance criteria is most valuable when initiated early in the application s development life cycle. It is frequently valuable to record the acceptance criteria for your application and store them in a place and format that is available to the entire team for review and comment. Criteria are typically determined by balancing your business, industry, technology, competitive, and user requirements. Test objectives frequently include the following: Response time. For example, the product catalog must be displayed in less than 3 seconds. Throughput. For example, the system must support 100 transactions per second. Resource utilization. A frequently overlooked aspect is the amount of resources your application is consuming, in terms of processor, memory, disk input output (I/O), and network I/O.
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Maximum user load. This test objective determines how many users can run on a specific hardware configuration. Business related metrics. This objective is mapped to business volume at normal and peak values; for example, the number of orders or Help desk calls handled at a given time.
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Step 2 - Identify Key Scenarios
Scenarios are anticipated user paths that generally incorporate multiple application activities. Key scenarios are those for which you have specific performance goals, those considered to be high-risk, those that are most commonly used, or those with a significant performance impact. The basic steps for identifying key scenarios are. 1. Identify all the scenarios for a Web application. For example, even the most basic ecommerce application must support the following user scenarios: o Browse catalog o Search for a product o Place an order 2. Identify the activities involved in each of the scenarios. For example, a Place an Order scenario will include the following activities: o Log on to the application. o Browse the product catalog. o Search for a specific product. o Add items to the shopping cart. o Validate credit card details and place an order. 3. Identify the scenarios that are most commonly executed or most resource-intensive; these will be the key scenarios used for load testing. For example, in an e-commerce application, browsing a catalog may be the most commonly executed scenario, whereas placing an order may be the most resource-intensive scenario because it accesses the database. o The most commonly executed scenarios for an existing Web application can be determined by examining the log files. o The most commonly executed scenarios for a new Web application can be obtained from market research, historical data, market trends, and so on. o Resource-intensive scenarios can be identified by using design documents or the actual code implementation. The primary resources are: Processor Memory Disk I/O Network I/O Once they have been identified, you will use these key scenarios to create workload profiles and to design load tests.
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