Robert Clausecker
fb16871572
libcpucycles is a 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, s390x, 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. When the program first calls cpucycles(), libcpucycles automatically benchmarks the available mechanisms and selects the mechanism that does the best job. Subsequent cpucycles() calls are thread-safe and very fast. An accompanying cpucycles-info program prints a summary of cycle-counter accuracy. WWW: https://cpucycles.cr.yp.to/ Tested by: jhibbits
8 lines
165 B
Plaintext
8 lines
165 B
Plaintext
bin/cpucycles-info
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include/cpucycles.h
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lib/libcpucycles.a
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lib/libcpucycles.so
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lib/libcpucycles.so.1
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share/man/man1/cpucycles-info.1.gz
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share/man/man3/cpucycles.3.gz
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