Java Performance on POWER7

Best Practice

Out of the box AIX is a robust, solid and scalable operating system. However, some changes to the default settings may be necessary in order for customers to realize the best possible performance for their applications based on the applications’ specific characteristics and needs.

This document describes performance considerations, tuning options, existing tools, and diagnostic options that can be used to guide tuning decisions to maximize performance for a given application or workload.

The following performance considerations will be discussed: 32-bit versus 64-bit Java, memory and various page sizes, application scaling, affinity, consolidation, and Java Garbage Collection tuning.

Data has been collected to illustrate the benefits of the following scenarios: 32-bit and 64-bit Java, various page sizes, affinity, and scaling along with existing tools that can be used to guide tuning decisions.

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Next generation applications for big data and analytics and cognitive computing are providing unprecedented insights into opportunities, threats and efficiencies. IBM Power Systems is at the forefront of delivering solutions to gain faster insights from analyzing both structured information and unstructured big data. With the secure, flexible and open platform of IBM Power Systems plus solutions and software, organizations can outpace their competitors by delivering faster services, providing differentiated offerings and turning operational cost into investment opportunity.

IBM Power Systems hardware is at the heart of enabling major business and industry transformations fueled by the explosive growth of big data and analytics. Power Systems help organizations drive faster business insights with industry leading performance, scalability and virtualization flexibility.

IBM Power Systems deliver flexibility and choice of operating systems to enable your business to support the next generation applications for big data and analytics and cognitive computing that are transforming how organizations work today. Whether running 1, 2, or all 3 - coupled with PowerVM, they maximize the benefit of Power Systems in your business.

IBM's integrated approach to developing Systems and Systems Software stacks together delivers a platform that supports next generation applications for big data and analytics and cognitive computing on an open platform for choice while providing maximum utilization, availability, and flexibility to help you deliver new advantages to your business.

IBM and IBM Business Partner solutions exploit key benefits in IBM Power Systems’ unique design combined with systems software to provide support for next generation applications for big data and analytics and cognitive computing to providing unprecedented insights into opportunities, threats and efficiencies to your organization.


Over the last five years thousands of clients have migrated to IBM Power Systems. Learn how Power Systems has helped them support next generation applications for big data and analytics and cognitive computing on an open platform for choice while improving business performance, reducing risk, and establishing a platform for growth.

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