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| -rw-r--r-- | doc/src/sgml/config.sgml | 14 |
1 files 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> |