diff options
| -rw-r--r-- | doc/src/sgml/runtime.sgml | 44 |
1 files changed, 19 insertions, 25 deletions
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml index c48ffa57afa..13731a318cd 100644 --- a/doc/src/sgml/runtime.sgml +++ b/doc/src/sgml/runtime.sgml @@ -1,4 +1,4 @@ -<!-- $PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.423 2008/12/16 19:30:43 alvherre Exp $ --> +<!-- $PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.424 2008/12/18 17:03:09 momjian Exp $ --> <chapter Id="runtime"> <title>Operating System Environment</title> @@ -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> |