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Optimizing HPC Applications with Intel® Cluster Tools by Christopher Dahnken, Michael Klemm, Andrey Semin, Alexander Supalov

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CHAPTER 7

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Addressing Application Bottlenecks: Microarchitecture

Microarchitectural performance tuning is one of the most difficult parts of the performance tuning process. In contrast to other tuning activities, it is not immediately clear what the bottlenecks are. Usually, discovering them requires studying processor manuals, which provide the details of the execution flow. Furthermore, a certain understanding of assembly language is needed to reflect the findings back onto the original source code. Each processor model will also have its own microarchitectural characteristics that have to be considered when writing efficient software.

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