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Tuning a memory-bound system requires analysis of performance data and knowledge of the application I/O patterns; if the application I/O patterns are not known, then additional data, such as trace data, can be gathered to determine this. Note that improper system tuning can sometimes result in unexpected system behavior, such as performance degradation. Therefore, changes need to be applied only when a bottleneck has been identified. The AIX 5L operating system provides a lot of very useful performance tools and features that can be used to monitor, identify, and remedy the memory bottleneck. The AIX 5L tuning techniques discussed in this paper have been proven to be effective on memory-bound systems in various IBM solution provider and enterprise environments.
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