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Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/config.sgml | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml index 427947cf496..994155ca00e 100644 --- a/doc/src/sgml/config.sgml +++ b/doc/src/sgml/config.sgml @@ -1906,6 +1906,30 @@ include_dir 'conf.d' </listitem> </varlistentry> + <varlistentry id="guc-min-dynamic-shared-memory" xreflabel="min_dynamic_shared_memory"> + <term><varname>min_dynamic_shared_memory</varname> (<type>integer</type>) + <indexterm> + <primary><varname>min_dynamic_shared_memory</varname> configuration parameter</primary> + </indexterm> + </term> + <listitem> + <para> + Specifies the amount of memory that should be allocated at server + startup time for use by parallel queries. When this memory region is + insufficient or exhausted by concurrent queries, new parallel queries + try to allocate extra shared memory temporarily from the operating + system using the method configured with + <varname>dynamic_shared_memory_type</varname>, which may be slower due + to memory management overheads. Memory that is allocated at startup + time with <varname>min_dynamic_shared_memory</varname> is affected by + the <varname>huge_pages</varname> setting on operating systems where + that is supported, and may be more likely to benefit from larger pages + on operating systems where that is managed automatically. + The default value is <literal>0</literal> (none). + </para> + </listitem> + </varlistentry> + </variablelist> </sect2> |