summary refs log tree commit diff
path: root/benchtests/bench-skeleton.c
blob: 09eb78df1bce2d9f5e410e3e82821eb9b271e70d (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
/* Skeleton for benchmark programs.
   Copyright (C) 2013-2017 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <string.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
#include <time.h>
#include <inttypes.h>
#include "bench-timing.h"
#include "json-lib.h"
#include "bench-util.h"

#include "bench-util.c"

#define TIMESPEC_AFTER(a, b) \
  (((a).tv_sec == (b).tv_sec) ?						      \
     ((a).tv_nsec > (b).tv_nsec) :					      \
	((a).tv_sec > (b).tv_sec))
int
main (int argc, char **argv)
{
  unsigned long i, k;
  struct timespec runtime;
  timing_t start, end;
  bool detailed = false;
  json_ctx_t json_ctx;

  if (argc == 2 && !strcmp (argv[1], "-d"))
    detailed = true;

  bench_start ();

  memset (&runtime, 0, sizeof (runtime));

  unsigned long iters, res;

#ifdef BENCH_INIT
  BENCH_INIT ();
#endif
  TIMING_INIT (res);

  iters = 1000 * res;

  json_init (&json_ctx, 2, stdout);

  /* Begin function.  */
  json_attr_object_begin (&json_ctx, FUNCNAME);

  for (int v = 0; v < NUM_VARIANTS; v++)
    {
      /* Run for approximately DURATION seconds.  */
      clock_gettime (CLOCK_MONOTONIC_RAW, &runtime);
      runtime.tv_sec += DURATION;

      double d_total_i = 0;
      timing_t total = 0, max = 0, min = 0x7fffffffffffffff;
      int64_t c = 0;
      while (1)
	{
	  for (i = 0; i < NUM_SAMPLES (v); i++)
	    {
	      uint64_t cur;
	      TIMING_NOW (start);
	      for (k = 0; k < iters; k++)
		BENCH_FUNC (v, i);
	      TIMING_NOW (end);

	      TIMING_DIFF (cur, start, end);

	      if (cur > max)
		max = cur;

	      if (cur < min)
		min = cur;

	      TIMING_ACCUM (total, cur);
	      /* Accumulate timings for the value.  In the end we will divide
	         by the total iterations.  */
	      RESULT_ACCUM (cur, v, i, c * iters, (c + 1) * iters);

	      d_total_i += iters;
	    }
	  c++;
	  struct timespec curtime;

	  memset (&curtime, 0, sizeof (curtime));
	  clock_gettime (CLOCK_MONOTONIC_RAW, &curtime);
	  if (TIMESPEC_AFTER (curtime, runtime))
	    goto done;
	}

      double d_total_s;
      double d_iters;

    done:
      d_total_s = total;
      d_iters = iters;

      /* Begin variant.  */
      json_attr_object_begin (&json_ctx, VARIANT (v));

      json_attr_double (&json_ctx, "duration", d_total_s);
      json_attr_double (&json_ctx, "iterations", d_total_i);
      json_attr_double (&json_ctx, "max", max / d_iters);
      json_attr_double (&json_ctx, "min", min / d_iters);
      json_attr_double (&json_ctx, "mean", d_total_s / d_total_i);

      if (detailed)
	{
	  json_array_begin (&json_ctx, "timings");

	  for (int i = 0; i < NUM_SAMPLES (v); i++)
	    json_element_double (&json_ctx, RESULT (v, i));

	  json_array_end (&json_ctx);
	}

      /* End variant.  */
      json_attr_object_end (&json_ctx);
    }

  /* End function.  */
  json_attr_object_end (&json_ctx);

  return 0;
}