From 2e92b5872faeb01f1865bb00556ec7be0ef006ee Mon Sep 17 00:00:00 2001
From: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: Fri, 27 Jan 2012 09:09:50 +0200
Subject: [PATCH] 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>
--
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