tests/benchmark/helpers.h

   1 #ifndef BENCHMARK_PERF_HELPERS_H
   2 #define BENCHMARK_PERF_HELPERS_H
   3
   4 /*
   5  * Utility functions and constants used by perf tests.
   6  */
   7 #include <inttypes.h>
   8 #include <time.h>
   9 #include <stdbool.h>
  10
  11 /*
  12  * mmap an anonymous chunk of memory.
  13  */
  14 unsigned char *mmap_buffer(size_t size);
  15 /*
  16  * Returns a - b in microseconds.
  17  * NB: a must be >= b
  18  */
  19 uint64_t timespec_difference_us(const struct timespec* a, const struct timespec* b);
  20 /*
  21  * Print the message to stdout along with the current time.
  22  * Also flushes stdout so that the log can help detect hangs. Don't call
  23  * this function from within the measured portion of the benchmark as it will
  24  * pollute your measurement.
  25  *
  26  * NB: Will only log if verbose == true.
  27  */
  28 void benchmark_log(bool verbose, const char *restrict fmt, ...) __attribute__((format(printf, 2, 3)));
  29
  30 static const uint64_t kNumMicrosecondsInSecond = 1000UL * 1000;
  31 static const uint64_t kNumNanosecondsInMicrosecond = 1000UL;
  32 static const uint64_t kNumNanosecondsInSecond = kNumNanosecondsInMicrosecond * kNumMicrosecondsInSecond;
  33 /* Get a (wall-time) timestamp in nanoseconds */
  34 #define current_timestamp_ns() (clock_gettime_nsec_np(CLOCK_MONOTONIC_RAW));
  35
  36 int get_ncpu(void);
  37
  38 #endif /* !defined(BENCHMARK_PERF_HELPERS_H) */