Application Performance Evaluator and Resource Allocation Tool

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What is Application Performance Evaluator and Resource Allocation Tool (APERA)?

APERA is a tool for performance modeling and evaluation, resource allocation, and capacity planning. APERA helps to build performance models for J2EE applications, solve the models, and choose the right configurations for the applications. It is a plug-in in Eclipse or WebSphere Studio.

Features supported by the performance models include the following:

• the software building blocks of a J2EE application: objects and containers
• topologies, workloads, and performance requirements
• multiple scenarios.

How does it work?

The performance model is an XML file and the performance measures (response time, "throughput," etc.) found by solving the model are contained in an XML file as well. As result of solving the performance model, the user gets information about the following:

• response times and throughput for each scenario
• worst response times across workload mixes
• CPU and DISK utilization
• quantitative information about the recommended number of threads or processes
• a suggested list of architectures, including the best one, obtained by re-allocating the objects across containers and nodes.

To solve the performance model, APERA builds a Queuing Network Model (QNM) that is solved using Mean Value Analysis (MVA). Maximum object utilization, worst-case response times, and architecture optimization are done by applying optimization techniques on top of performance models.