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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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6
src/include/storage/buf_internals.h
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@@ -8,7 +8,7 @@
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/buf_internals.h,v 1.100 2009/01/01 17:24:01 momjian Exp $
* $PostgreSQL: pgsql/src/include/storage/buf_internals.h,v 1.101 2009/01/12 05:10:45 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -208,7 +208,9 @@ extern int BufTableInsert(BufferTag *tagPtr, uint32 hashcode, int buf_id);
extern void BufTableDelete(BufferTag *tagPtr, uint32 hashcode);
/* localbuf.c */
extern BufferDesc *LocalBufferAlloc(SMgrRelation reln, ForkNumber forkNum,
extern void LocalPrefetchBuffer(SMgrRelation smgr, ForkNumber forkNum,
BlockNumber blockNum);
extern BufferDesc *LocalBufferAlloc(SMgrRelation smgr, ForkNumber forkNum,
BlockNumber blockNum, bool *foundPtr);
extern void MarkLocalBufferDirty(Buffer buffer);
extern void DropRelFileNodeLocalBuffers(RelFileNode rnode, ForkNumber forkNum,