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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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11
src/include/pg_config_manual.h
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@@ -6,7 +6,7 @@
* for developers. If you edit any of these, be sure to do a *full*
* rebuild (and an initdb if noted).
*
* $PostgreSQL: pgsql/src/include/pg_config_manual.h,v 1.36 2009/01/11 18:02:17 tgl Exp $
* $PostgreSQL: pgsql/src/include/pg_config_manual.h,v 1.37 2009/01/12 05:10:45 tgl Exp $
*------------------------------------------------------------------------
*/
@@ -135,6 +135,15 @@
#define USE_POSIX_FADVISE
#endif
/*
* USE_PREFETCH code should be compiled only if we have a way to implement
* prefetching. (This is decoupled from USE_POSIX_FADVISE because there
* might in future be support for alternative low-level prefetch APIs.)
*/
#ifdef USE_POSIX_FADVISE
#define USE_PREFETCH
#endif
/*
* This is the default directory in which AF_UNIX socket files are
* placed. Caution: changing this risks breaking your existing client