From b4bfb642b3a3f38e7e4fa1464a344fde8efc006f Mon Sep 17 00:00:00 2001
From: momjian <momjian>
Date: Thu, 18 Dec 2008 17:03:09 +0000
Subject: [PATCH] Update documentation table describing how shared memory is
 used by various facilities.

---
 doc/src/sgml/runtime.sgml | 42 ++++++++++++++++++------------------------
 1 file changed, 18 insertions(+), 24 deletions(-)

diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index f07f69343f..417d0f56e7 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -1080,41 +1080,45 @@ set semsys:seminfo_semmsl=32
 
 
    <table id="shared-memory-parameters">
-    <title>Configuration parameters affecting
-    <productname>PostgreSQL</productname>'s shared memory usage</>
+    <title><productname>PostgreSQL</productname> shared memory usage</>
 
     <tgroup cols="2">
      <thead>
       <row>
-       <entry>Name</>
-       <entry>Approximate multiplier (bytes per increment) as of 8.3</>
+       <entry>Usage</>
+       <entry>Approximate shared memory bytes required (as of 8.3)</>
       </row>
      </thead>
 
      <tbody>
       <row>
-       <entry><xref linkend="guc-max-connections"></>
-       <entry>1800 + 270 * <xref linkend="guc-max-locks-per-transaction"></entry>
+       <entry>Connections</>
+       <entry>(1800 + 270 * <xref
+       linkend="guc-max-locks-per-transaction">) * <xref
+       linkend="guc-max-connections"></entry>
       </row>
 
       <row>
-       <entry><xref linkend="guc-autovacuum-max-workers"></>
-       <entry>1800 + 270 * <xref linkend="guc-max-locks-per-transaction"></entry>
+       <entry>Autovacuum workers</>
+       <entry>(1800 + 270 * <xref
+       linkend="guc-max-locks-per-transaction">) * <xref
+       linkend="guc-autovacuum-max-workers"></entry>
       </row>
 
       <row>
-       <entry><xref linkend="guc-max-prepared-transactions"></>
-       <entry>770 + 270 * <xref linkend="guc-max-locks-per-transaction"></entry>
+       <entry>Prepared transactions</>
+       <entry>(770 + 270 * <xref
+       linkend="guc-max-locks-per-transaction">) * <xref linkend="guc-max-prepared-transactions"></entry>
       </row>
 
       <row>
-       <entry><xref linkend="guc-shared-buffers"></>
-       <entry>8400 (assuming 8 kB <symbol>BLCKSZ</>)</entry>
+       <entry>Shared disk buffers</>
+       <entry>(<xref linkend="guc-block-size"> + 208) * <xref linkend="guc-shared-buffers"></entry>
       </row>
 
       <row>
-       <entry><xref linkend="guc-wal-buffers"></>
-       <entry>8200 (assuming 8 kB <symbol>XLOG_BLCKSZ</>)</entry>
+       <entry>WAL buffers</>
+       <entry>(<xref linkend="guc-wal-block-size"> + 8) * <xref linkend="guc-wal-buffers"></entry>
       </row>
 
       <row>
@@ -1125,18 +1129,8 @@ set semsys:seminfo_semmsl=32
     </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>
 
-
   <sect2>
    <title>Resource Limits</title>
 
-- 
2.11.4.GIT