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Modify aset.c logic so that blocks requested from malloc get

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bigger the more space is used in an allocset.  This reduces the malloc
overhead very substantially on queries that need lots of memory.
This commit is contained in:
Tom Lane
1999-05-22 23:19:37 +00:00
parent f9f90b21b2
commit d52a91a5d8
2 changed files with 122 additions and 36 deletions
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13
src/include/utils/memutils.h
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@ -15,7 +15,7 @@
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: memutils.h,v 1.23 1999/03/25 19:05:19 tgl Exp $
* $Id: memutils.h,v 1.24 1999/05/22 23:19:36 tgl Exp $
*
* NOTES
* some of the information in this file will be moved to
@ -96,7 +96,7 @@ extern void OrderedElemPushInto(OrderedElem elem, OrderedSet Set);
* an allocation is requested for a set, memory is allocated and a
* pointer is returned. Subsequently, this memory may be freed or
* reallocated. In addition, an allocation set may be reset which
* will cause all allocated memory to be freed.
* will cause all memory allocated within it to be freed.
*
* Allocations may occur in four different modes. The mode of
* allocation does not affect the behavior of allocations except in
@ -109,7 +109,7 @@ extern void OrderedElemPushInto(OrderedElem elem, OrderedSet Set);
* and freed very frequently. This is a good choice when allocation
* characteristics are unknown. This is the default mode.
*
* "Static" mode attemts to allocate space as efficiently as possible
* "Static" mode attempts to allocate space as efficiently as possible
* without regard to freeing memory. This mode should be chosen only
* when it is known that many allocations will occur but that very
* little of the allocated memory will be explicitly freed.
@ -129,7 +129,7 @@ extern void OrderedElemPushInto(OrderedElem elem, OrderedSet Set);
* Allocation sets are not automatically reset on a system reset.
* Higher level code is responsible for cleaning up.
*
* There may other modes in the future.
* There may be other modes in the future.
*/
/*
@ -176,7 +176,9 @@ typedef AllocBlockData *AllocBlock;
* The prefix of each piece of memory in an AllocBlock
*/
typedef struct AllocChunkData {
/* aset is the owning aset if allocated, or the freelist link if free */
void *aset;
/* size is always the chunk size */
Size size;
} AllocChunkData;
@ -189,7 +191,8 @@ typedef AllocChunkData *AllocChunk;
typedef struct AllocSetData
{
struct AllocBlockData *blocks;
struct AllocChunkData *freelist[8];
#define ALLOCSET_NUM_FREELISTS 8
struct AllocChunkData *freelist[ALLOCSET_NUM_FREELISTS];
/* Note: this will change in the future to support other modes */
} AllocSetData;