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Increase amount of shared buffers initdb tries to allocate to 4000,

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and add logic to try max_fsm_pages up to 200000, plus accompanying minor
docs changes.
This commit is contained in:
Andrew Dunstan
2005-12-27 23:54:01 +00:00
parent a598385f3b
commit a37422e042
2 changed files with 38 additions and 11 deletions
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10
doc/src/sgml/config.sgml
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@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.40 2005/12/23 00:38:03 momjian Exp $
$PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.41 2005/12/27 23:54:01 adunstan Exp $
-->
<chapter Id="runtime-config">
<title>Server Configuration</title>
@ -672,7 +672,7 @@ SET ENABLE_SEQSCAN TO OFF;
<listitem>
<para>
Sets the number of shared memory buffers used by the database
server. The default is typically 1000, but may be less if your
server. The default is typically 4000, but may be less if your
kernel settings will not support it (as determined during
<application>initdb</>). Each buffer is 8192 bytes, unless a
different value of <symbol>BLCKSZ</symbol> was chosen when building
@ -867,8 +867,10 @@ SET ENABLE_SEQSCAN TO OFF;
Sets the maximum number of disk pages for which free space will
be tracked in the shared free-space map. Six bytes of shared memory
are consumed for each page slot. This setting must be more than
16 * <varname>max_fsm_relations</varname>. The default is 20000.
This option can only be set at server start.
16 * <varname>max_fsm_relations</varname>. The default is 20000,
but <application>initdb</> will try to set it as close as possible
to 200000, depending on the amount of available memory.
This option can only be set at server start.
</para>
</listitem>
</varlistentry>