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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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13
src/backend/utils/misc/guc.c
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@ -10,7 +10,7 @@
* Written by Peter Eisentraut <peter_e@gmx.net>.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.179 2004/01/23 23:54:21 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.180 2004/01/24 20:00:45 wieck Exp $
*
*--------------------------------------------------------------------
*/
@ -95,6 +95,8 @@ static const char *assign_msglvl(int *var, const char *newval,
static const char *assign_log_error_verbosity(const char *newval, bool doit,
GucSource source);
static bool assign_phony_autocommit(bool newval, bool doit, GucSource source);
extern const char *BgWriterAssignSyncMethod(const char *method,
bool doit, GucSource source);
/*
@ -1689,6 +1691,15 @@ static struct config_string ConfigureNamesString[] =
XLOG_sync_method_default, assign_xlog_sync_method, NULL
},
{
{"bgwriter_flush_method", PGC_SIGHUP, RESOURCES,
gettext_noop("Selects the method used by the bgwriter for forcing writes out to disk."),
NULL
},
&BgWriterFlushMethod_str,
BgWriterFlushMethod_default, BgWriterAssignSyncMethod, NULL
},
/* End-of-list marker */
{
{NULL, 0, 0, NULL, NULL}, NULL, NULL, NULL, NULL