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Background writer process

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This first part of the background writer does no syncing at all.
It's only purpose is to keep the LRU heads clean so that regular
backends seldom to never have to call write().

Jan
This commit is contained in:
Jan Wieck
2003-11-19 15:55:08 +00:00
parent 5032f83082
commit cfeca62148
12 changed files with 271 additions and 42 deletions
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30
src/backend/utils/misc/guc.c
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@@ -10,7 +10,7 @@
* Written by Peter Eisentraut <peter_e@gmx.net>.
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.170 2003/11/16 16:41:01 wieck Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.171 2003/11/19 15:55:08 wieck Exp $
*
*--------------------------------------------------------------------
*/
@@ -44,6 +44,7 @@
#include "optimizer/prep.h"
#include "parser/parse_expr.h"
#include "parser/parse_relation.h"
#include "storage/bufmgr.h"
#include "storage/fd.h"
#include "storage/freespace.h"
#include "storage/lock.h"
@@ -1200,6 +1201,33 @@ static struct config_int ConfigureNamesInt[] =
0, 0, 600, NULL, NULL
},
{
{"bgwriter_delay", PGC_SIGHUP, RESOURCES,
gettext_noop("Background writer sleep time between rounds in milliseconds"),
NULL
},
&BgWriterDelay,
200, 10, 5000, NULL, NULL
},
{
{"bgwriter_percent", PGC_SIGHUP, RESOURCES,
gettext_noop("Background writer percentage of dirty buffers to flush per round"),
NULL
},
&BgWriterPercent,
1, 0, 100, NULL, NULL
},
{
{"bgwriter_maxpages", PGC_SIGHUP, RESOURCES,
gettext_noop("Background writer maximum number of pages to flush per round"),
NULL
},
&BgWriterMaxpages,
100, 1, 1000, NULL, NULL
},
/* End-of-list marker */
{
{NULL, 0, 0, NULL, NULL}, NULL, 0, 0, 0, NULL, NULL

5
src/backend/utils/misc/postgresql.conf.sample
View File

@@ -60,6 +60,11 @@
#vacuum_mem = 8192 # min 1024, size in KB
#debug_shared_buffers = 0 # 0-600 seconds
# - Background writer -
#bgwriter_delay = 200 # 10-5000 milliseconds
#bgwriter_percent = 1 # 0-100% of dirty buffers
#bgwriter_maxpages = 100 # 1-1000 buffers max at once
# - Free Space Map -
#max_fsm_pages = 20000 # min max_fsm_relations*16, 6 bytes each