# Systems Performance

Brendan Gregg's catalog (2nd ed. 2020) of Linux performance methodology: USE method, RED method, on-CPU vs off-CPU flame graphs, eBPF-based tracers, the whole BCC/bpftrace toolbox. Reference rather than narrative — but a reference that defines the working vocabulary for any post-2015 performance investigation. Read by the [[eatonphil-bookclub]] in 2024: [cohort page](https://eatonphil.com/2024-systems-performance.html).

Related concepts: [[ebpf-sock-ops]], [[spinlock]], [[linux-preemption-models]].