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Implement prefetching via posix_fadvise() for bitmap index scans. A new

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GUC variable effective_io_concurrency controls how many concurrent block
prefetch requests will be issued.

(The best way to handle this for plain index scans is still under debate,
so that part is not applied yet --- tgl)

Greg Stark
This commit is contained in:
Tom Lane
2009-01-12 05:10:45 +00:00
parent 1a37056a74
commit b7b8f0b609
15 changed files with 422 additions and 17 deletions
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5
src/include/storage/bufmgr.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.119 2009/01/01 17:24:01 momjian Exp $
* $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.120 2009/01/12 05:10:45 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -47,6 +47,7 @@ extern PGDLLIMPORT int NBuffers;
extern bool zero_damaged_pages;
extern int bgwriter_lru_maxpages;
extern double bgwriter_lru_multiplier;
extern int target_prefetch_pages;
/* in buf_init.c */
extern PGDLLIMPORT char *BufferBlocks;
@@ -152,6 +153,8 @@ extern PGDLLIMPORT int32 *LocalRefCount;
/*
* prototypes for functions in bufmgr.c
*/
extern void PrefetchBuffer(Relation reln, ForkNumber forkNum,
BlockNumber blockNum);
extern Buffer ReadBuffer(Relation reln, BlockNumber blockNum);
extern Buffer ReadBufferExtended(Relation reln, ForkNumber forkNum,
BlockNumber blockNum, ReadBufferMode mode,