Part IV
Reasoning
Do not read so much, look about you and think of what you see there.
—Richard P. Feynman
In Part I of this book, we learned how to do careful measurements of four of the fundamental shared computer resources: CPU, memory, disk/SSD, and network. In Part II, we looked at existing tools and techniques for observing the behavior of complex software: logs, counters, profiles, and traces. In Part III, we learned how to build and use the KUtrace tool. By simply recording every transition between kernel-mode execution and user-mode execution, users of KUtrace can observe all the execution and non-execution that occurs across all programs and all transactions running on all CPU cores.
This Part IV explores reasoning from the observations ...
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