/* GLIB sliced memory - fast threaded memory chunk allocator

 * Copyright (C) 2005 Tim Janik

 * Portion Copyright © 2008-09 Nokia Corporation and/or its subsidiary(-ies). All rights reserved.

 * 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 <stdio.h>

#include <string.h>

#include <sys/time.h> // gettimeofday

#define quick_rand32()  (rand_accu = 1664525 * rand_accu + 1013904223, rand_accu)

static guint    prime_size = 1021; // 769; // 509

static gboolean clean_memchunks = FALSE;

static guint    number_of_blocks = 10000;          /* total number of blocks allocated */

static guint    number_of_repetitions = 10000;     /* number of alloc+free repetitions */

/* --- old memchunk prototypes (memchunks.c) --- */

void            old_mem_chunks_init     (void);

GMemChunk*      old_mem_chunk_new       (const gchar  *name,

                                         gint          atom_size,

                                         gulong        area_size,

                                         gint          type);

void            old_mem_chunk_destroy   (GMemChunk *mem_chunk);

gpointer        old_mem_chunk_alloc     (GMemChunk *mem_chunk);

gpointer        old_mem_chunk_alloc0    (GMemChunk *mem_chunk);

void            old_mem_chunk_free      (GMemChunk *mem_chunk,

                                         gpointer   mem);

void            old_mem_chunk_clean     (GMemChunk *mem_chunk);

void            old_mem_chunk_reset     (GMemChunk *mem_chunk);

void            old_mem_chunk_print     (GMemChunk *mem_chunk);

void            old_mem_chunk_info      (void);

#ifndef G_ALLOC_AND_FREE

#define G_ALLOC_AND_FREE  2

#endif

/* --- functions --- */

static inline gpointer

memchunk_alloc (GMemChunk **memchunkp,

                guint       size)

{

  size = MAX (size, 1);

  if (G_UNLIKELY (!*memchunkp))

    *memchunkp = old_mem_chunk_new ("", size, 4096, G_ALLOC_AND_FREE);

  return old_mem_chunk_alloc (*memchunkp);

}

static inline void

memchunk_free (GMemChunk *memchunk,

               gpointer   chunk)

{

  old_mem_chunk_free (memchunk, chunk);

  if (clean_memchunks)

    old_mem_chunk_clean (memchunk);

}

static gpointer

test_memchunk_thread (gpointer data)

{

  GMemChunk **memchunks;

  guint i, j;

  guint8 **ps;

  guint   *ss;

  guint32 rand_accu = 2147483563;

  /* initialize random numbers */

  if (data)

    rand_accu = *(guint32*) data;

  else

    {

      struct timeval rand_tv;

      gettimeofday (&rand_tv, NULL);

      rand_accu = rand_tv.tv_usec + (rand_tv.tv_sec << 16);

    }

  /* prepare for memchunk creation */

  memchunks = g_alloca (sizeof (memchunks[0]) * prime_size);

  memset (memchunks, 0, sizeof (memchunks[0]) * prime_size);

  ps = g_new (guint8*, number_of_blocks);

  ss = g_new (guint, number_of_blocks);

  /* create number_of_blocks random sizes */

  for (i = 0; i < number_of_blocks; i++)

    ss[i] = quick_rand32() % prime_size;

  /* allocate number_of_blocks blocks */

  for (i = 0; i < number_of_blocks; i++)

    ps[i] = memchunk_alloc (&memchunks[ss[i]], ss[i]);

  for (j = 0; j < number_of_repetitions; j++)

    {

      /* free number_of_blocks/2 blocks */

      for (i = 0; i < number_of_blocks; i += 2)

        memchunk_free (memchunks[ss[i]], ps[i]);

      /* allocate number_of_blocks/2 blocks with new sizes */

      for (i = 0; i < number_of_blocks; i += 2)

        {

          ss[i] = quick_rand32() % prime_size;

          ps[i] = memchunk_alloc (&memchunks[ss[i]], ss[i]);

        }

    }

  /* free number_of_blocks blocks */

  for (i = 0; i < number_of_blocks; i++)

    memchunk_free (memchunks[ss[i]], ps[i]);

  /* alloc and free many equally sized chunks in a row */

  for (i = 0; i < number_of_repetitions; i++)

    {

      guint sz = quick_rand32() % prime_size;

      guint k = number_of_blocks / 100;

      for (j = 0; j < k; j++)

        ps[j] = memchunk_alloc (&memchunks[sz], sz);

      for (j = 0; j < k; j++)

        memchunk_free (memchunks[sz], ps[j]);

    }

  /* cleanout memchunks */

  for (i = 0; i < prime_size; i++)

    if (memchunks[i])

      old_mem_chunk_destroy (memchunks[i]);

  g_free (ps);

  g_free (ss);

  return NULL;

}

static gpointer

test_sliced_mem_thread (gpointer data)

{

guint i, j;

guint   *ss; 

guint8 **ps;

  guint32 rand_accu = 2147483563;

  /* initialize random numbers */

  if (data)

    rand_accu = *(guint32*) data;

  else

    {

      struct timeval rand_tv;

      gettimeofday (&rand_tv, NULL);

      rand_accu = rand_tv.tv_usec + (rand_tv.tv_sec << 16);

    }

//guint i,j;

/* guint8*/ ps = g_new (guint8*, number_of_blocks);

/* guint*/  ss = g_new (guint, number_of_blocks);

  /* create number_of_blocks random sizes */

  for (i = 0; i < number_of_blocks; i++)

    ss[i] = quick_rand32() % prime_size;

  /* allocate number_of_blocks blocks */

  for (i = 0; i < number_of_blocks; i++)

    ps[i] = g_slice_alloc (ss[i]);

  for (j = 0; j < number_of_repetitions; j++)

    {

      /* free number_of_blocks/2 blocks */

      for (i = 0; i < number_of_blocks; i += 2)

        g_slice_free1 (ss[i], ps[i]);

      /* allocate number_of_blocks/2 blocks with new sizes */

      for (i = 0; i < number_of_blocks; i += 2)

        {

          ss[i] = quick_rand32() % prime_size;

          ps[i] = g_slice_alloc (ss[i]);

        }

    }

  /* free number_of_blocks blocks */

  for (i = 0; i < number_of_blocks; i++)

    g_slice_free1 (ss[i], ps[i]);

  /* alloc and free many equally sized chunks in a row */

  for (i = 0; i < number_of_repetitions; i++)

    {

      guint sz = quick_rand32() % prime_size;

      guint k = number_of_blocks / 100;

      for (j = 0; j < k; j++)

        ps[j] = g_slice_alloc (sz);

      for (j = 0; j < k; j++)

        g_slice_free1 (sz, ps[j]);

    }

  g_free (ps);

  g_free (ss);

  return NULL;

}

static void

usage (void)

{

  g_print ("Usage: slice-test [n_threads] [G|S|M|O][f][c] [maxblocksize] [seed]\n");

}

int

main (int   argc,

      char *argv[])

{

  gchar strseed[64] = "<random>";

  guint seed32, *seedp = NULL;

  gboolean ccounters = FALSE, use_memchunks = FALSE;

  guint n_threads = 1;

  guint i;

  GThread *threads[1];

  const gchar *mode = "slab allocator + magazine cache", *emode = " ";

  if (argc > 1)

    n_threads = g_ascii_strtoull (argv[1], NULL, 10);

  if (argc > 2)

    {

      guint i, l = strlen (argv[2]);

      for (i = 0; i < l; i++)

        switch (argv[2][i])

          {

          case 'G': /* GLib mode */

            g_slice_set_config (G_SLICE_CONFIG_ALWAYS_MALLOC, FALSE);

            g_slice_set_config (G_SLICE_CONFIG_BYPASS_MAGAZINES, FALSE);

            mode = "slab allocator + magazine cache";

            break;

          case 'S': /* slab mode */

            g_slice_set_config (G_SLICE_CONFIG_ALWAYS_MALLOC, FALSE);

            g_slice_set_config (G_SLICE_CONFIG_BYPASS_MAGAZINES, TRUE);

            mode = "slab allocator";

            break;

          case 'M': /* malloc mode */

            g_slice_set_config (G_SLICE_CONFIG_ALWAYS_MALLOC, TRUE);

            mode = "system malloc";

            break;

          case 'O': /* old memchunks */

            use_memchunks = TRUE;

            mode = "old memchunks";

            break;

          case 'f': /* eager freeing */

            g_slice_set_config (G_SLICE_CONFIG_WORKING_SET_MSECS, 0);

            clean_memchunks = TRUE;

            emode = " with eager freeing";

            break;

          case 'c': /* print contention counters */

            ccounters = TRUE;

            break;

          default:

            usage();

            return 1;

          }

    }

  if (argc > 3)

    prime_size = g_ascii_strtoull (argv[3], NULL, 10);

  if (argc > 4)

    {

      seed32 = g_ascii_strtoull (argv[4], NULL, 10);

      seedp = &seed32;

    }

  g_thread_init (NULL);

  if (argc <= 1)

    usage();

 // gchar strseed[64] = "<random>";

  if (seedp)

    g_snprintf (strseed, 64, "%u", *seedp);

  g_print ("Starting %d threads allocating random blocks <= %u bytes with seed=%s using %s%s\n", n_threads, prime_size, strseed, mode, emode);

//  GThread *threads[n_threads];

//  guint i;

  if (!use_memchunks)

    for (i = 0; i < n_threads; i++)

      threads[i] = g_thread_create_full (test_sliced_mem_thread, seedp, 0, TRUE, FALSE, 0, NULL);

  else

    {

      old_mem_chunks_init();

      for (i = 0; i < n_threads; i++)

        threads[i] = g_thread_create_full (test_memchunk_thread, seedp, 0, TRUE, FALSE, 0, NULL);

    }

  for (i = 0; i < n_threads; i++)

    g_thread_join (threads[i]);

  if (ccounters)

    {

      guint n, n_chunks = g_slice_get_config (G_SLICE_CONFIG_CHUNK_SIZES);

      g_print ("    ChunkSize | MagazineSize | Contention\n");

      for (i = 0; i < n_chunks; i++)

        {

          gint64 *vals = g_slice_get_config_state (G_SLICE_CONFIG_CONTENTION_COUNTER, i, &n);

          g_print ("  %9llu   |  %9llu   |  %9llu\n", vals[0], vals[2], vals[1]);

          g_free (vals);

        }

    }

  else

    g_print ("Done.\n");

  return 0;

}