postgres.git / summary / log / commit / refs

commit    2e92b5872faeb01f1865bb00556ec7be0ef006ee
Author:   Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date:     Fri Jan 27 07:09:50 2012 +0000
First released in: 9.2.0

    Mention in the docs that bgwriter now sleeps longer when it has no work to do.


 doc/src/sgml/config.sgml | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 309b6a54615..3a843217602 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1322,12 +1322,14 @@ SET ENABLE_SEQSCAN TO OFF;
          background writer.  In each round the writer issues writes
          for some number of dirty buffers (controllable by the
          following parameters).  It then sleeps for <varname>bgwriter_delay</>
-         milliseconds, and repeats.  The default value is 200 milliseconds
-         (<literal>200ms</>). Note that on many systems, the effective
-         resolution of sleep delays is 10 milliseconds; setting
-         <varname>bgwriter_delay</> to a value that is not a multiple of
-         10 might have the same results as setting it to the next higher
-         multiple of 10.  This parameter can only be set in the
+         milliseconds, and repeats.  When there are no dirty buffers in the
+         buffer pool, though, it goes into a longer sleep regardless of
+         <varname>bgwriter_delay</>.  The default value is 200
+         milliseconds (<literal>200ms</>). Note that on many systems, the
+         effective resolution of sleep delays is 10 milliseconds; setting
+         <varname>bgwriter_delay</> to a value that is not a multiple of 10
+         might have the same results as setting it to the next higher multiple
+         of 10.  This parameter can only be set in the
          <filename>postgresql.conf</> file or on the server command line.
         </para>
        </listitem>


[parent: 3946c281613e]