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Add some stats collection in debugging mode. 

No good way to extract output yet.
This commit is contained in:
Jeremy Hylton 2006-02-28 19:57:06 +00:00
parent dfc240450c
commit 56820c2bab
1 changed files with 41 additions and 3 deletions
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44
Python/pyarena.c
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@ -1,8 +1,12 @@
#include "Python.h"
#include "pyarena.h"
/* A simple arena block structure */
/* TODO(jhylton): Measurement to justify block size. */
/* A simple arena block structure
Measurements with standard library modules suggest the average
allocation is about 20 bytes and that most compiles use a single
block.
*/
#define DEFAULT_BLOCK_SIZE 8192
typedef struct _block {
@ -21,6 +25,14 @@ struct _arena {
block *a_head;
block *a_cur;
PyObject *a_objects;
#if defined(Py_DEBUG)
/* Debug output */
size_t total_allocs;
size_t total_size;
size_t total_blocks;
size_t total_block_size;
size_t total_big_blocks;
#endif
};
static block *
@ -86,12 +98,19 @@ PyArena_New()
free((void *)arena);
return NULL;
}
arena->a_objects = PyList_New(16);
arena->a_objects = PyList_New(0);
if (!arena->a_objects) {
block_free(arena->a_head);
free((void *)arena);
return NULL;
}
#if defined(Py_DEBUG)
arena->total_allocs = 0;
arena->total_size = 0;
arena->total_blocks = 1;
arena->total_block_size = DEFAULT_BLOCK_SIZE;
arena->total_big_blocks = 0;
#endif
return arena;
}
@ -99,6 +118,15 @@ void
PyArena_Free(PyArena *arena)
{
assert(arena);
#if defined(Py_DEBUG)
/*
fprintf(stderr,
"alloc=%d size=%d blocks=%d block_size=%d big=%d objects=%d\n",
arena->total_allocs, arena->total_size, arena->total_blocks,
arena->total_block_size, arena->total_big_blocks,
PyList_Size(arena->a_objects));
*/
#endif
block_free(arena->a_head);
assert(arena->a_objects->ob_refcnt == 1);
Py_DECREF(arena->a_objects);
@ -111,9 +139,19 @@ PyArena_Malloc(PyArena *arena, size_t size)
void *p = block_alloc(arena->a_cur, size);
if (!p)
return NULL;
#if defined(Py_DEBUG)
arena->total_allocs++;
arena->total_size += size;
#endif
/* Reset cur if we allocated a new block. */
if (arena->a_cur->ab_next) {
arena->a_cur = arena->a_cur->ab_next;
#if defined(Py_DEBUG)
arena->total_blocks++;
arena->total_block_size += arena->a_cur->ab_size;
if (arena->a_cur->ab_size > DEFAULT_BLOCK_SIZE)
arena->total_big_blocks++;
#endif
}
return p;
}