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Add checkpoint_warning to warn of excessive checkpoints caused by too

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few WAL files.
This commit is contained in:
Bruce Momjian 2002-11-15 02:44:57 +00:00
parent 3779f7fd9f
commit 2986aa6a66
6 changed files with 52 additions and 5 deletions
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14
doc/src/sgml/runtime.sgml
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@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/runtime.sgml,v 1.154 2002/11/15 01:57:25 momjian Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/runtime.sgml,v 1.155 2002/11/15 02:44:50 momjian Exp $
-->
<Chapter Id="runtime">
@ -2081,6 +2081,18 @@ dynamic_library_path = '/usr/local/lib/postgresql:/home/my_project/lib:$libdir'
</listitem>
</varlistentry>
<variablelist>
<varlistentry>
<term><varname>CHECKPOINT_WARNING</varname> (<type>integer</type>)</term>
<listitem>
<para>
Send a message to the server logs if checkpoints caused by the
filling of checkpoint segment files happens more frequently than
this number of seconds. Zero turns off the warning.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>COMMIT_DELAY</varname> (<type>integer</type>)</term>
<listitem>

12
doc/src/sgml/wal.sgml
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@ -1,4 +1,4 @@
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/wal.sgml,v 1.21 2002/11/02 22:23:01 tgl Exp $ -->
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/wal.sgml,v 1.22 2002/11/15 02:44:54 momjian Exp $ -->
<chapter id="wal">
<title>Write-Ahead Logging (<acronym>WAL</acronym>)</title>
@ -300,6 +300,16 @@
correspondingly increase shared memory usage.
</para>
<para>
Checkpoints are fairly expensive because they force all dirty kernel
buffers to disk using the operating system <literal>sync()</> call.
Busy servers may fill checkpoint segment files too quickly,
causing excessive checkpointing. If such forced checkpoints happen
more frequently than <varname>CHECKPOINT_WARNING</varname> seconds,
a message, will be output to the server logs recommending increasing
<varname>CHECKPOINT_SEGMENTS</varname>.
</para>
<para>
The <varname>COMMIT_DELAY</varname> parameter defines for how many
microseconds the backend will sleep after writing a commit

20
src/backend/postmaster/postmaster.c
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@ -37,7 +37,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.296 2002/11/15 01:57:26 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.297 2002/11/15 02:44:55 momjian Exp $
*
* NOTES
*
@ -198,6 +198,8 @@ bool SilentMode = false; /* silent mode (-S) */
int PreAuthDelay = 0;
int AuthenticationTimeout = 60;
int CheckPointTimeout = 300;
int CheckPointWarning = 30;
time_t LastSignalledCheckpoint = 0;
bool log_hostname; /* for ps display */
bool LogSourcePort;
@ -2329,6 +2331,22 @@ sigusr1_handler(SIGNAL_ARGS)
if (CheckPostmasterSignal(PMSIGNAL_DO_CHECKPOINT))
{
if (CheckPointWarning != 0)
{
/*
* This only times checkpoints forced by running out of
* segment files. Other checkpoints could reduce
* the frequency of forced checkpoints.
*/
time_t now = time(NULL);
if (now - LastSignalledCheckpoint < CheckPointWarning)
elog(LOG, "Checkpoint segments are being created too frequently (%d secs)\n
Consider increasing CHECKPOINT_SEGMENTS",
now - LastSignalledCheckpoint);
LastSignalledCheckpoint = now;
}
/*
* Request to schedule a checkpoint
*

7
src/backend/utils/misc/guc.c
View File

@ -5,7 +5,7 @@
* command, configuration file, and command line options.
* See src/backend/utils/misc/README for more information.
*
* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.105 2002/11/15 01:57:27 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.106 2002/11/15 02:44:57 momjian Exp $
*
* Copyright 2000 by PostgreSQL Global Development Group
* Written by Peter Eisentraut <peter_e@gmx.net>.
@ -660,6 +660,11 @@ static struct config_int
300, 30, 3600, NULL, NULL
},
{
{"checkpoint_warning", PGC_SIGHUP}, &CheckPointWarning,
30, 0, INT_MAX, NULL, NULL
},
{
{"wal_buffers", PGC_POSTMASTER}, &XLOGbuffers,
8, 4, INT_MAX, NULL, NULL

1
src/backend/utils/misc/postgresql.conf.sample
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@ -65,6 +65,7 @@
#
#checkpoint_segments = 3 # in logfile segments, min 1, 16MB each
#checkpoint_timeout = 300 # range 30-3600, in seconds
#checkpoint_warning = 30 # 0 is off, in seconds
#
#commit_delay = 0 # range 0-100000, in microseconds
#commit_siblings = 5 # range 1-1000

3
src/include/access/xlog.h
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@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: xlog.h,v 1.39 2002/09/26 22:58:34 tgl Exp $
* $Id: xlog.h,v 1.40 2002/11/15 02:44:57 momjian Exp $
*/
#ifndef XLOG_H
#define XLOG_H
@ -184,6 +184,7 @@ extern XLogRecPtr ProcLastRecEnd;
/* these variables are GUC parameters related to XLOG */
extern int CheckPointSegments;
extern int CheckPointWarning;
extern int XLOGbuffers;
extern int XLOG_DEBUG;
extern char *XLOG_sync_method;