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It should be clear that the physical architecture of the environment that is, the actual hardware that runs the software is at least as important as the logical architecture. Many teams refer to the actual hardware as the environment or the network architecture, but neither term actually encompasses everything of interest to a performance tester. What concerns the tester is generally represented in diagrams where actual, physical computers are shown and labeled with the roles they play, along with the other actual, physical computers with which they communicate. The following diagram shows an example of one such physical architecture diagram.
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Figure 8.3 Physical Architecture
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The system architecture is actually just a consolidation of the logical and physical architectures. The diagram below is an example depiction of system architecture. Obviously, it does not include every aspect of the architecture, but it does serve to highlight some points of interest for performance testing, in this case: Authentication and application tiers can be served by two servers. The mapping will allow information to better design performance tests. Performance tests can be targeted at the application tier directly, for example. Putting these two pieces of the puzzle together adds the most value to the performance-testing effort. Having this information at your fingertips, along with the more detailed code architecture of what functions or activities are handled on which tiers, allows you to design tests that can determine and isolate bottlenecks.
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Figure 8.4 System Architecture
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Consider the following key points when capturing the system s logical and physical architecture: Some teams view testing as a black-box activity; that is, it reminds and educates the team of the necessity to design performance tests well and maintain knowledge of the entire system from the load-balancing scheme to the thread-sharing model of code objects. Doing so allows the performance tester to identify high risk areas early in the project.
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To test a Web farm, it is necessary to use Internet Protocol (IP) switching techniques to correctly simulate production because of server affinity for IP addresses. Application servers and Web servers are frequently multi-homed (that is, having more than one network interface card), with one facing the clients/Web server and another facing the Web server/database back end. This is done for security reasons and also to avoid network utilization on one network interface card for both types of traffic. Characteristics such as this can have a significant impact on performance test design, execution, and analysis. The performance tester will not be as effective if he or she is not accepted by the development team as a technical resource. By determining the system architecture, the performance tester can establish him or herself as a technical resource with the developers and architects.
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Although system evaluation is an ongoing process throughout the performance-testing effort, it provides the most value when conducted early in the performance-testing project. During the system evaluation process, collect information about the project as a whole, the functions of the system and/or business processes, the expected user activities, the system architecture, and any other details that are helpful in guiding performance testing in order to achieve the project s specific needs. This information helps in defining the performance goals and requirements, characterizing the workload, creating performance test strategies and plans, and assessing project and system risks.
PART IV Identify Performance Acceptance Criteria
In This Part:
Determining Performance Testing Objective Quantifying End-User Response Time Goals Consolidating Various Types of Performance Acceptance Criteria
9 Determining Performance Testing Objectives Objectives
Learn how to identify and capture performance-testing objectives. Learn how to capture or estimate resource usage targets and thresholds. Learn how to capture or estimate resource budgets or allocations. Learn how to review and update various types of performance-testing objectives and communicate the updates to the team throughout the project as more information becomes available.
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