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Added GUC variable bgwriter_flush_method controlling the action

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done by the background writer between writing dirty blocks and
napping.

    none (default)   no action
	sync             bgwriter calls smgrsync() causing a sync(2)

A global sync() is only good on dedicated database servers, so
more flush methods should be added in the future.

Jan
This commit is contained in:
Jan Wieck
2004-01-24 20:00:46 +00:00
parent 610d33c194
commit d77b63b17c
4 changed files with 68 additions and 5 deletions
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6
src/include/storage/bufmgr.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.73 2003/12/14 00:34:47 neilc Exp $
* $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.74 2004/01/24 20:00:46 wieck Exp $
*
*-------------------------------------------------------------------------
*/
@@ -31,6 +31,8 @@ extern bool zero_damaged_pages;
extern int BgWriterDelay;
extern int BgWriterPercent;
extern int BgWriterMaxpages;
extern char *BgWriterFlushMethod_str;
extern const char BgWriterFlushMethod_default[];
/* in buf_init.c */
@@ -180,8 +182,6 @@ extern void AbortBufferIO(void);
extern void BufmgrCommit(void);
extern int BufferSync(int percent, int maxpages);
extern void BufferBackgroundWriter(void);
extern const char *BgWriterAssignSyncMethod(const char *method,
bool doid, bool interactive);
extern void InitLocalBuffer(void);