libcpucycles – count CPU cycles on several architectures #Programming
libcpucycles is a public-domain microlibrary for counting CPU cycles. Cycle counts are not as detailed as Falk diagrams but are the most precise timers available to typical software; they are central tools used in understanding and improving software performance.
The libcpucycles API is simple: include <cpucycles.h>, call cpucycles() to receive a long long whenever desired, and link with -lcpucycles.
Internally, libcpucycles understands machine-level cycle counters for amd64 (both PMC and TSC), arm32, arm64 (both PMC and VCT), mips64, ppc32, ppc64, riscv32, riscv64, sparc64, and x86. libcpucycles also understands four OS-level mechanisms, which give varying levels of accuracy: mach_absolute_time, perf_event, CLOCK_MONOTONIC, and, as a fallback, microsecond-resolution gettimeofday.
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