File: slice-color.c

package info (click to toggle)
glib2.0 2.58.3-2
  • links: PTS, VCS
  • area: main
  • in suites: buster, buster-proposed-updates
  • size: 48,744 kB
  • sloc: ansic: 452,196; xml: 16,781; python: 6,149; makefile: 3,776; sh: 1,499; perl: 1,140; cpp: 9
file content (177 lines) | stat: -rw-r--r-- 4,924 bytes parent folder | download | duplicates (4)
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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
/* GLIB sliced memory - fast threaded memory chunk allocator
 * Copyright (C) 2005 Tim Janik
 *
 * This 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.
 *
 * This 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 this library; if not, see <http://www.gnu.org/licenses/>.
 */
#include <glib.h>
#include <string.h>

#define ALIGN(size, base)       ((base) * (gsize) (((size) + (base) - 1) / (base)))

static gdouble parse_memsize (const gchar *cstring);
static void    usage         (void);

static void
fill_memory (guint **mem,
             guint   n,
             guint   val)
{
  guint j, o = 0;
  for (j = 0; j < n; j++)
    mem[j][o] = val;
}

static guint64
access_memory3 (guint  **mema,
                guint  **memb,
                guint  **memd,
                guint    n,
                guint64  repeats)
{
  guint64 accu = 0, i, j;
  const guint o = 0;
  for (i = 0; i < repeats; i++)
    {
      for (j = 1; j < n; j += 2)
        memd[j][o] = mema[j][o] + memb[j][o];
    }
  for (i = 0; i < repeats; i++)
    for (j = 0; j < n; j++)
      accu += memd[j][o];
  return accu;
}

static void
touch_mem (guint64 block_size,
           guint64 n_blocks,
           guint64 repeats)
{
  guint64 j, accu, n = n_blocks;
  GTimer *timer;
  guint **memc;
  guint **memb;
  guint **mema = g_new (guint*, n);
  for (j = 0; j < n; j++)
    mema[j] = g_slice_alloc (block_size);
  memb = g_new (guint*, n);
  for (j = 0; j < n; j++)
    memb[j] = g_slice_alloc (block_size);
  memc = g_new (guint*, n);
  for (j = 0; j < n; j++)
    memc[j] = g_slice_alloc (block_size);

  timer = g_timer_new();
  fill_memory (mema, n, 2);
  fill_memory (memb, n, 3);
  fill_memory (memc, n, 4);
  access_memory3 (mema, memb, memc, n, 3);
  g_timer_start (timer);
  accu = access_memory3 (mema, memb, memc, n, repeats);
  g_timer_stop (timer);

  g_print ("Access-time = %fs\n", g_timer_elapsed (timer, NULL));
  g_assert (accu / repeats == (2 + 3) * n / 2 + 4 * n / 2);

  for (j = 0; j < n; j++)
    {
      g_slice_free1 (block_size, mema[j]);
      g_slice_free1 (block_size, memb[j]);
      g_slice_free1 (block_size, memc[j]);
    }
  g_timer_destroy (timer);
  g_free (mema);
  g_free (memb);
  g_free (memc);
}

static void
usage (void)
{
  g_print ("Usage: slice-color <block-size> [memory-size] [repeats] [colorization]\n");
}

int
main (int   argc,
      char *argv[])
{
  guint64 block_size = 512, area_size = 1024 * 1024, n_blocks, repeats = 1000000;

  if (argc > 1)
    block_size = parse_memsize (argv[1]);
  else
    {
      usage();
      block_size = 512;
    }
  if (argc > 2)
    area_size = parse_memsize (argv[2]);
  if (argc > 3)
    repeats = parse_memsize (argv[3]);
  if (argc > 4)
    g_slice_set_config (G_SLICE_CONFIG_COLOR_INCREMENT, parse_memsize (argv[4]));

  /* figure number of blocks from block and area size.
   * divide area by 3 because touch_mem() allocates 3 areas
   */
  n_blocks = area_size / 3 / ALIGN (block_size, sizeof (gsize) * 2);

  /* basic sanity checks */
  if (!block_size || !n_blocks || block_size >= area_size)
    {
      g_printerr ("Invalid arguments: block-size=%" G_GUINT64_FORMAT " memory-size=%" G_GUINT64_FORMAT "\n", block_size, area_size);
      usage();
      return 1;
    }

  g_printerr ("Will allocate and touch %" G_GUINT64_FORMAT " blocks of %" G_GUINT64_FORMAT " bytes (= %" G_GUINT64_FORMAT " bytes) %" G_GUINT64_FORMAT " times with color increment: 0x%08" G_GINT64_MODIFIER "x\n",
              n_blocks, block_size, n_blocks * block_size, repeats,
	      (guint64)g_slice_get_config (G_SLICE_CONFIG_COLOR_INCREMENT));

  touch_mem (block_size, n_blocks, repeats);
  
  return 0;
}

static gdouble
parse_memsize (const gchar *cstring)
{
  gchar *mem = g_strdup (cstring);
  gchar *string = g_strstrip (mem);
  guint l = strlen (string);
  gdouble f = 0;
  gchar *derr = NULL;
  gdouble msize;

  switch (l ? string[l - 1] : 0)
    {
    case 'k':   f = 1000;               break;
    case 'K':   f = 1024;               break;
    case 'm':   f = 1000000;            break;
    case 'M':   f = 1024 * 1024;        break;
    case 'g':   f = 1000000000;         break;
    case 'G':   f = 1024 * 1024 * 1024; break;
    }
  if (f)
    string[l - 1] = 0;
  msize = g_ascii_strtod (string, &derr);
  g_free (mem);
  if (derr && *derr)
    {
      g_printerr ("failed to parse number at: %s\n", derr);
      msize = 0;
    }
  if (f)
    msize *= f;
  return msize;
}