Aligned blocks management: obsolete?

[Dmitry Antipov <dmantipov@yandex.ru>]

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Is it still required to maintain the cache of aligned blocks
to workaround poor malloc behavior? I believe an attached
example should perform well (i.e. allocate ~4K blocks without
~4K holes between them) on top of any non-ancient glibc (no
ideas about other system malloc implementations, BTW).

Dmitry

[-- Attachment #2: aligned-alloc.c --]
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#include <stdio.h>
#include <stdlib.h>

#define BLOCKSZ 4096

int
main (int argc, char *argv[])
{
  int i, j;
  void *p;

  /* make some chaos in the heap */
  for (i = 0; i < 1000; i++)
    for (j = 0; j < 1024; j++)
      {
	p = malloc (j);
	if (((i + j) & 7) == 0)
	  free (p);
      }

  /* test */
  for (i = 0; i < 16; i++)
    if (!posix_memalign (&p, BLOCKSZ, BLOCKSZ - sizeof (long)))
      printf ("%p\n", p);
  printf ("--\n");

  /* make even more chaos with larger chunks */
  for (i = 0; i < 1000; i++)
    {
      p = malloc (i * 1000);
      if ((i & 7) == 0)
	free (p);
    }

  /* test again */
  for (i = 0; i < 16; i++)
    if (!posix_memalign (&p, BLOCKSZ, BLOCKSZ - sizeof (long)))
      printf ("%p\n", p);

  return 0;
}