Perf
Perf is a performance analysis tool for Linux systems, part of the Linux kernel's performance monitoring subsystem (perf_events). It provides a suite of commands to profile and trace system and application performance, including CPU usage, cache misses, hardware events, and software events. It is widely used for performance tuning, debugging bottlenecks, and optimizing code in Linux environments.
Developers should learn Perf when working on performance-critical applications on Linux, such as high-throughput servers, real-time systems, or resource-constrained embedded devices. It is essential for identifying CPU hotspots, memory access patterns, and hardware-level inefficiencies, enabling data-driven optimizations to improve application speed and efficiency.