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Rework temp_tablespaces patch so that temp tablespaces are assigned separately

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for each temp file, rather than once per sort or hashjoin; this allows
spreading the data of a large sort or join across multiple tablespaces.
(I remain dubious that this will make any difference in practice, but certain
people insisted.)  Arrange to cache the results of parsing the GUC variable
instead of recomputing from scratch on every demand, and push usage of the
cache down to the bottommost fd.c level.
This commit is contained in:
Tom Lane
2007-06-07 19:19:57 +00:00
parent 2d9d7a6bf5
commit 24ee8af573
14 changed files with 284 additions and 169 deletions
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4
src/include/storage/buffile.h
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@@ -18,7 +18,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/buffile.h,v 1.21 2007/06/03 17:08:32 tgl Exp $
* $PostgreSQL: pgsql/src/include/storage/buffile.h,v 1.22 2007/06/07 19:19:57 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -34,7 +34,7 @@ typedef struct BufFile BufFile;
* prototypes for functions in buffile.c
*/
extern BufFile *BufFileCreateTemp(bool interXact, Oid tblspcOid);
extern BufFile *BufFileCreateTemp(bool interXact);
extern void BufFileClose(BufFile *file);
extern size_t BufFileRead(BufFile *file, void *ptr, size_t size);
extern size_t BufFileWrite(BufFile *file, void *ptr, size_t size);