benchtests/bench-timing.h

   1 /* Define timing macros.
   2    Copyright (C) 2013-2014 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <hp-timing.h>
  20 #include <stdint.h>
  21
  22 #if HP_TIMING_AVAIL && !defined USE_CLOCK_GETTIME
  23 # define GL(x) _##x
  24 # define GLRO(x) _##x
  25 hp_timing_t _dl_hp_timing_overhead;
  26 typedef hp_timing_t timing_t;
  27
  28 # define TIMING_INIT(res) \
  29 ({                                                                            \
  30   HP_TIMING_DIFF_INIT();                                                      \
  31   (res) = 1;                                                          \
  32 })
  33
  34 # define TIMING_NOW(var) HP_TIMING_NOW (var)
  35 # define TIMING_DIFF(diff, start, end) HP_TIMING_DIFF ((diff), (start), (end))
  36 # define TIMING_ACCUM(sum, diff) HP_TIMING_ACCUM_NT ((sum), (diff))
  37
  38 # define TIMING_PRINT_STATS(func, d_total_s, d_iters, d_total_i, max, min) \
  39   printf ("%s: ITERS:%g: TOTAL:%gMcy, MAX:%gcy, MIN:%gcy, %g calls/Mcy\n",    \
  40           (func), (d_total_i), (d_total_s) * 1e-6, (max) / (d_iters),         \
  41           (min) / (d_iters), 1e6 * (d_total_i) / (d_total_s));
  42
  43 #else
  44
  45 #include <time.h>
  46 typedef uint64_t timing_t;
  47
  48 /* Measure the resolution of the clock so we can scale the number of
  49    benchmark iterations by this value.  */
  50 # define TIMING_INIT(res) \
  51 ({                                                                            \
  52   struct timespec start;                                                      \
  53   clock_getres (CLOCK_PROCESS_CPUTIME_ID, &start);                            \
  54   (res) = start.tv_nsec;                                              \
  55 })
  56
  57 # define TIMING_NOW(var) \
  58 ({                                                                            \
  59   struct timespec tv;                                                         \
  60   clock_gettime (CLOCK_PROCESS_CPUTIME_ID, &tv);                              \
  61   (var) = (uint64_t) (tv.tv_nsec + (uint64_t) 1000000000 * tv.tv_sec);        \
  62 })
  63
  64 # define TIMING_DIFF(diff, start, end) (diff) = (end) - (start)
  65 # define TIMING_ACCUM(sum, diff) (sum) += (diff)
  66
  67 # define TIMING_PRINT_STATS(func, d_total_s, d_iters, d_total_i, max, min) \
  68   printf ("%s: ITERS:%g: TOTAL:%gs, MAX:%gns, MIN:%gns, %g iter/s\n",         \
  69           (func), (d_total_i), (d_total_s) * 1e-9, (max) / (d_iters),                 \
  70           (min) / (d_iters), 1e9 * (d_total_i) / (d_total_s))
  71
  72 #endif
  73
  74 #define TIMING_PRINT_MEAN(d_total_s, d_iters) \
  75   printf ("\t%g", (d_total_s) / (d_iters))