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Commitd77b63b

Browse files
Jan WieckJan Wieck
Jan Wieck
authored and
Jan Wieck
committed
Added GUC variable bgwriter_flush_method controlling the action
done by the background writer between writing dirty blocks andnapping. none (default) no actionsync bgwriter calls smgrsync() causing a sync(2)A global sync() is only good on dedicated database servers, somore flush methods should be added in the future.Jan
1 parent610d33c commitd77b63b

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4 files changed

+68
-5
lines changed

4 files changed

+68
-5
lines changed

‎src/backend/storage/buffer/bufmgr.c‎

Lines changed: 50 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.152 2004/01/09 21:08:49 momjian Exp $
11+
* $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.153 2004/01/24 20:00:45 wieck Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -55,6 +55,7 @@
5555
#include"storage/proc.h"
5656
#include"storage/smgr.h"
5757
#include"utils/relcache.h"
58+
#include"utils/guc.h"
5859

5960
#include"pgstat.h"
6061

@@ -65,9 +66,23 @@
6566
/* GUC variable */
6667
boolzero_damaged_pages= false;
6768

69+
#defineBGWRITER_FLUSH_NONE0
70+
#defineBGWRITER_FLUSH_NONE_STR"none"
71+
#defineBGWRITER_FLUSH_SYNC1
72+
#defineBGWRITER_FLUSH_SYNC_STR"sync"
73+
74+
#defineBGWRITER_FLUSH_DEFAULTBGWRITER_FLUSH_NONE
75+
#defineBGWRITER_FLUSH_DEFAULT_STRBGWRITER_FLUSH_NONE_STR
76+
6877
intBgWriterDelay=200;
6978
intBgWriterPercent=1;
7079
intBgWriterMaxpages=100;
80+
intBgWriterFlushMethod=BGWRITER_FLUSH_NONE;
81+
char*BgWriterFlushMethod_str=NULL;
82+
constcharBgWriterFlushMethod_default[]=BGWRITER_FLUSH_DEFAULT_STR;
83+
84+
constchar*BgWriterAssignSyncMethod(constchar*method,
85+
booldoit,GucSourcesource);
7186

7287
staticvoidWaitIO(BufferDesc*buf);
7388
staticvoidStartBufferIO(BufferDesc*buf,boolforInput);
@@ -1026,6 +1041,19 @@ BufferBackgroundWriter(void)
10261041
if (InterruptPending)
10271042
return;
10281043

1044+
/*
1045+
* Perform the configured buffer flush method
1046+
*/
1047+
switch (BgWriterFlushMethod)
1048+
{
1049+
caseBGWRITER_FLUSH_NONE:
1050+
break;
1051+
1052+
caseBGWRITER_FLUSH_SYNC:
1053+
smgrsync();
1054+
break;
1055+
}
1056+
10291057
/*
10301058
* Nap for the configured time or sleep for 10 seconds if
10311059
* there was nothing to do at all.
@@ -1037,6 +1065,27 @@ BufferBackgroundWriter(void)
10371065
}
10381066
}
10391067

1068+
constchar*
1069+
BgWriterAssignSyncMethod(constchar*method,booldoit,GucSourcesource)
1070+
{
1071+
intnew_flush_method;
1072+
1073+
if (strcasecmp(method,BGWRITER_FLUSH_NONE_STR)==0)
1074+
new_flush_method=BGWRITER_FLUSH_NONE;
1075+
else
1076+
if (strcasecmp(method,BGWRITER_FLUSH_SYNC_STR)==0)
1077+
new_flush_method=BGWRITER_FLUSH_SYNC;
1078+
else
1079+
returnNULL;
1080+
1081+
if (!doit)
1082+
returnmethod;
1083+
1084+
BgWriterFlushMethod=new_flush_method;
1085+
returnmethod;
1086+
}
1087+
1088+
10401089
/*
10411090
* Do whatever is needed to prepare for commit at the bufmgr and smgr levels
10421091
*/

‎src/backend/utils/misc/guc.c‎

Lines changed: 12 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -10,7 +10,7 @@
1010
* Written by Peter Eisentraut <peter_e@gmx.net>.
1111
*
1212
* IDENTIFICATION
13-
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.179 2004/01/23 23:54:21 tgl Exp $
13+
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.180 2004/01/24 20:00:45 wieck Exp $
1414
*
1515
*--------------------------------------------------------------------
1616
*/
@@ -95,6 +95,8 @@ static const char *assign_msglvl(int *var, const char *newval,
9595
staticconstchar*assign_log_error_verbosity(constchar*newval,booldoit,
9696
GucSourcesource);
9797
staticboolassign_phony_autocommit(boolnewval,booldoit,GucSourcesource);
98+
externconstchar*BgWriterAssignSyncMethod(constchar*method,
99+
booldoit,GucSourcesource);
98100

99101

100102
/*
@@ -1689,6 +1691,15 @@ static struct config_string ConfigureNamesString[] =
16891691
XLOG_sync_method_default,assign_xlog_sync_method,NULL
16901692
},
16911693

1694+
{
1695+
{"bgwriter_flush_method",PGC_SIGHUP,RESOURCES,
1696+
gettext_noop("Selects the method used by the bgwriter for forcing writes out to disk."),
1697+
NULL
1698+
},
1699+
&BgWriterFlushMethod_str,
1700+
BgWriterFlushMethod_default,BgWriterAssignSyncMethod,NULL
1701+
},
1702+
16921703
/* End-of-list marker */
16931704
{
16941705
{NULL,0,0,NULL,NULL},NULL,NULL,NULL,NULL

‎src/backend/utils/misc/postgresql.conf.sample‎

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -61,9 +61,12 @@
6161
#debug_shared_buffers = 0# 0-600 seconds
6262

6363
# - Background writer -
64+
#debug_shared_buffers = 0# 0-600 seconds interval (0 = off)
6465
#bgwriter_delay = 200# 10-5000 milliseconds
6566
#bgwriter_percent = 1# 0-100% of dirty buffers
6667
#bgwriter_maxpages = 100# 1-1000 buffers max at once
68+
#bgwriter_flush_method = none # how the bgwriter flushes kernel buffers
69+
# one of: none or sync
6770

6871
# - Free Space Map -
6972

‎src/include/storage/bufmgr.h‎

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
88
* Portions Copyright (c) 1994, Regents of the University of California
99
*
10-
* $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.73 2003/12/1400:34:47 neilc Exp $
10+
* $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.74 2004/01/24 20:00:46 wieck Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -31,6 +31,8 @@ extern bool zero_damaged_pages;
3131
externintBgWriterDelay;
3232
externintBgWriterPercent;
3333
externintBgWriterMaxpages;
34+
externchar*BgWriterFlushMethod_str;
35+
externconstcharBgWriterFlushMethod_default[];
3436

3537

3638
/* in buf_init.c */
@@ -180,8 +182,6 @@ extern void AbortBufferIO(void);
180182
externvoidBufmgrCommit(void);
181183
externintBufferSync(intpercent,intmaxpages);
182184
externvoidBufferBackgroundWriter(void);
183-
externconstchar*BgWriterAssignSyncMethod(constchar*method,
184-
booldoid,boolinteractive);
185185

186186
externvoidInitLocalBuffer(void);
187187

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