Описание тега perf
Perf is a profiler tool for Linux 2.6+ based systems.
Perf is a profiling tool for Linux 2.6+ based systems that uses the perf_events kernel interface to provide a command-line interface to underlying hardware, software and kernel performance counters. It abstracts away differences in performance counters implemented across different CPU architectures, allowing consistency across different hardware.
See also the perf wiki.