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Reduce memory consumption during VACUUM of large relations, by using

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FSMPageData (6 bytes) instead of PageFreeSpaceInfo (8 or 16 bytes)
for the temporary array of page-free-space information.

Itagaki Takahiro
This commit is contained in:
Tom Lane
2008-03-10 02:04:10 +00:00
parent 9537739f7f
commit 3fcc7e8e18
4 changed files with 48 additions and 60 deletions
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14
src/include/storage/freespace.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/freespace.h,v 1.27 2008/01/01 19:45:59 momjian Exp $
* $PostgreSQL: pgsql/src/include/storage/freespace.h,v 1.28 2008/03/10 02:04:10 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -18,16 +18,6 @@
#include "storage/itemptr.h"
/*
* exported types
*/
typedef struct PageFreeSpaceInfo
{
BlockNumber blkno; /* which page in relation */
Size avail; /* space available on this page */
} PageFreeSpaceInfo;
/* Initial value for average-request moving average */
#define INITIAL_AVERAGE ((Size) (BLCKSZ / 32))
@@ -144,7 +134,7 @@ extern Size GetAvgFSMRequestSize(RelFileNode *rel);
extern void RecordRelationFreeSpace(RelFileNode *rel,
BlockNumber interestingPages,
int nPages,
PageFreeSpaceInfo *pageSpaces);
FSMPageData *pageSpaces);
extern BlockNumber GetFreeIndexPage(RelFileNode *rel);
extern void RecordIndexFreeSpace(RelFileNode *rel,