本文是Brendan Gregg的《Systems Performance: Enterprise and the Cloud》第一章读书笔记，涵盖了系统性能的定义，性能分析活动的理想执行顺序，以及性能分析的两个视角——工作负载分析和资源分析。此外，还探讨了性能分析的挑战，包括主观性、系统复杂性和可能存在的多个性能问题。
最近开始读Brendan Gregg这本《Systems Performance: Enterprise and the Cloud》（http://www.brendangregg.com/sysperfbook.html）。为了防止像以前一样，读完一遍没有任何印象，我决定开始记读书笔记，以下就是第一章的笔记：
1. System performance is the study of the entire system, including all physical components and thf full software stack. Anything in the data path, software or hardware, is included, as it can affect performance.
2. The field of performance includes the following activities, listed in an ideal order of execution:
(1) Setting performance objectives and performance modeling;
(2) Performance characterization of the prototype software or hardware;
(3) Performance analysis of development code, pre-integration;
(4) Performing non-regression testing for software builds, pre- or post-release;
(5) Benchmarking/Benchmarketing for software
1. System performance is the study of the entire system, including all physical components and thf full software stack. Anything in the data path, software or hardware, is included, as it can affect performance.
2. The field of performance includes the following activities, listed in an ideal order of execution:
(1) Setting performance objectives and performance modeling;
(2) Performance characterization of the prototype software or hardware;
(3) Performance analysis of development code, pre-integration;
(4) Performing non-regression testing for software builds, pre- or post-release;
(5) Benchmarking/Benchmarketing for software
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