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Add note to the shared memory sizing table about needing to use page count in

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shared_buffers and wal_buffers, not size in bytes.  Per discussion.
This commit is contained in:
Alvaro Herrera 2008-12-16 19:30:43 +00:00
parent fc3297d828
commit 5434e46986
1 changed files with 11 additions and 1 deletions
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12
doc/src/sgml/runtime.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.422 2008/11/20 11:48:26 mha Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.423 2008/12/16 19:30:43 alvherre Exp $ -->
<chapter Id="runtime">
<title>Operating System Environment</title>
@ -1124,6 +1124,16 @@ set semsys:seminfo_semmsl=32
</tbody>
</tgroup>
</table>
<note>
<para>
The multipliers for <varname>shared_buffers</> and
<varname>wal_buffers</> should be the number of buffers, not the
amount in bytes. To find out the number of shared or wal buffers, divide
the amount in bytes by <xref linkend="guc-block-size"> and
<xref linkend="guc-wal-block-size">, respectively.
</para>
</note>
</sect2>