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/* 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 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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#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;
guint **mema = g_new (guint*, n);
for (j = 0; j < n; j++)
mema[j] = g_slice_alloc (block_size);
guint **memb = g_new (guint*, n);
for (j = 0; j < n; j++)
memb[j] = g_slice_alloc (block_size);
guint **memc = g_new (guint*, n);
for (j = 0; j < n; j++)
memc[j] = g_slice_alloc (block_size);
GTimer *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=%llu memory-size=%llu\n", block_size, area_size);
usage();
return 1;
}
g_printerr ("Will allocate and touch %llu blocks of %llu bytes (= %llu bytes) %llu times with color increment: 0x%08llx\n",
n_blocks, block_size, n_blocks * block_size, repeats, 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;
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;
gchar *derr = NULL;
gdouble 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;
}
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