Add checkpoint_warning to warn of excessive checkpoints caused by too
few WAL files.
This commit is contained in:
Bruce Momjian
parent
3779f7fd9f
commit
2986aa6a66
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@ -1,5 +1,5 @@
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<!--
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$Header: /cvsroot/pgsql/doc/src/sgml/runtime.sgml,v 1.154 2002/11/15 01:57:25 momjian Exp $
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$Header: /cvsroot/pgsql/doc/src/sgml/runtime.sgml,v 1.155 2002/11/15 02:44:50 momjian Exp $
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-->
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<Chapter Id="runtime">
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@ -2081,6 +2081,18 @@ dynamic_library_path = '/usr/local/lib/postgresql:/home/my_project/lib:$libdir'
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</listitem>
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</varlistentry>
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<variablelist>
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<varlistentry>
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<term><varname>CHECKPOINT_WARNING</varname> (<type>integer</type>)</term>
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<listitem>
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<para>
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Send a message to the server logs if checkpoints caused by the
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filling of checkpoint segment files happens more frequently than
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this number of seconds. Zero turns off the warning.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>COMMIT_DELAY</varname> (<type>integer</type>)</term>
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<listitem>
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@ -1,4 +1,4 @@
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<!-- $Header: /cvsroot/pgsql/doc/src/sgml/wal.sgml,v 1.21 2002/11/02 22:23:01 tgl Exp $ -->
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<!-- $Header: /cvsroot/pgsql/doc/src/sgml/wal.sgml,v 1.22 2002/11/15 02:44:54 momjian Exp $ -->
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<chapter id="wal">
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<title>Write-Ahead Logging (<acronym>WAL</acronym>)</title>
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@ -300,6 +300,16 @@
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correspondingly increase shared memory usage.
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</para>
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<para>
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Checkpoints are fairly expensive because they force all dirty kernel
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buffers to disk using the operating system <literal>sync()</> call.
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Busy servers may fill checkpoint segment files too quickly,
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causing excessive checkpointing. If such forced checkpoints happen
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more frequently than <varname>CHECKPOINT_WARNING</varname> seconds,
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a message, will be output to the server logs recommending increasing
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<varname>CHECKPOINT_SEGMENTS</varname>.
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</para>
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<para>
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The <varname>COMMIT_DELAY</varname> parameter defines for how many
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microseconds the backend will sleep after writing a commit
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@ -37,7 +37,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.296 2002/11/15 01:57:26 momjian Exp $
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* $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.297 2002/11/15 02:44:55 momjian Exp $
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*
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* NOTES
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*
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@ -198,6 +198,8 @@ bool SilentMode = false; /* silent mode (-S) */
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int PreAuthDelay = 0;
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int AuthenticationTimeout = 60;
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int CheckPointTimeout = 300;
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int CheckPointWarning = 30;
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time_t LastSignalledCheckpoint = 0;
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bool log_hostname; /* for ps display */
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bool LogSourcePort;
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@ -2329,6 +2331,22 @@ sigusr1_handler(SIGNAL_ARGS)
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if (CheckPostmasterSignal(PMSIGNAL_DO_CHECKPOINT))
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{
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if (CheckPointWarning != 0)
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{
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/*
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* This only times checkpoints forced by running out of
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* segment files. Other checkpoints could reduce
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* the frequency of forced checkpoints.
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*/
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time_t now = time(NULL);
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if (now - LastSignalledCheckpoint < CheckPointWarning)
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elog(LOG, "Checkpoint segments are being created too frequently (%d secs)\n
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Consider increasing CHECKPOINT_SEGMENTS",
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now - LastSignalledCheckpoint);
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LastSignalledCheckpoint = now;
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}
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/*
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* Request to schedule a checkpoint
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*
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@ -5,7 +5,7 @@
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* command, configuration file, and command line options.
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* See src/backend/utils/misc/README for more information.
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*
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* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.105 2002/11/15 01:57:27 momjian Exp $
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* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.106 2002/11/15 02:44:57 momjian Exp $
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*
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* Copyright 2000 by PostgreSQL Global Development Group
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* Written by Peter Eisentraut <peter_e@gmx.net>.
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@ -660,6 +660,11 @@ static struct config_int
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300, 30, 3600, NULL, NULL
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},
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{
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{"checkpoint_warning", PGC_SIGHUP}, &CheckPointWarning,
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30, 0, INT_MAX, NULL, NULL
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},
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{
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{"wal_buffers", PGC_POSTMASTER}, &XLOGbuffers,
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8, 4, INT_MAX, NULL, NULL
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@ -65,6 +65,7 @@
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#
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#checkpoint_segments = 3 # in logfile segments, min 1, 16MB each
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#checkpoint_timeout = 300 # range 30-3600, in seconds
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#checkpoint_warning = 30 # 0 is off, in seconds
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#
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#commit_delay = 0 # range 0-100000, in microseconds
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#commit_siblings = 5 # range 1-1000
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@ -6,7 +6,7 @@
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* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: xlog.h,v 1.39 2002/09/26 22:58:34 tgl Exp $
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* $Id: xlog.h,v 1.40 2002/11/15 02:44:57 momjian Exp $
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*/
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#ifndef XLOG_H
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#define XLOG_H
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@ -184,6 +184,7 @@ extern XLogRecPtr ProcLastRecEnd;
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/* these variables are GUC parameters related to XLOG */
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extern int CheckPointSegments;
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extern int CheckPointWarning;
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extern int XLOGbuffers;
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extern int XLOG_DEBUG;
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extern char *XLOG_sync_method;
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