Обсуждение: [BUGS] backend_flush_after bytes/pages
Hello, doc/src/smgl/config.sgml: line 2049 for postgres 9.6 states: "Whenever more than backend_flush_after bytes have been written...",which suggests that the data is interpreted as bytes. However the by initdb generated postgresql.conf file mentionsthat backend_flush_after is in pages, and pg_settings says the unit is 8kB. Please rephrase doc/src/smgl/config.sgml to state, that the unit for backend_flush_after is not bytes, but pages. Kind regards Dilian -- Sent via pgsql-bugs mailing list (pgsql-bugs@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-bugs
Hi, On 2017-02-07 19:40:45 +0100, Дилян Палаузов wrote: > doc/src/smgl/config.sgml: line 2049 for postgres 9.6 states: "Whenever more than backend_flush_after bytes have been written...",which suggests that the data is interpreted as bytes. However the by initdb generated postgresql.conf file mentionsthat backend_flush_after is in pages, and pg_settings says the unit is 8kB. > Please rephrase doc/src/smgl/config.sgml to state, that the unit for > backend_flush_after is not bytes, but pages. You can configure it in bytes though, so I don't really think that matters? Regards, Andres -- Sent via pgsql-bugs mailing list (pgsql-bugs@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-bugs
Hello, does backend_flush_after = 7 mean 7 bytes or seven pages? https://www.postgresql.org/docs/9.6/static/runtime-config-resource.html#GUC-BACKEND-FLUSH-AFTERsuggests it means 7 bytes,which is not the reality. The documentation is misleading. Greetings Dilian On 02/07/17 19:57, Andres Freund wrote: > Hi, > > On 2017-02-07 19:40:45 +0100, Дилян Палаузов wrote: >> doc/src/smgl/config.sgml: line 2049 for postgres 9.6 states: "Whenever more than backend_flush_after bytes have been written...",which suggests that the data is interpreted as bytes. However the by initdb generated postgresql.conf file mentionsthat backend_flush_after is in pages, and pg_settings says the unit is 8kB. > >> Please rephrase doc/src/smgl/config.sgml to state, that the unit for >> backend_flush_after is not bytes, but pages. > > You can configure it in bytes though, so I don't really think that > matters? > > Regards, > > Andres > > -- Sent via pgsql-bugs mailing list (pgsql-bugs@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-bugs
Hi, (please don't top-quote on this list) On 2017-02-07 20:21:58 +0100, Дилян Палаузов wrote: > does > backend_flush_after = 7 > mean 7 bytes or seven pages? https://www.postgresql.org/docs/9.6/static/runtime-config-resource.html#GUC-BACKEND-FLUSH-AFTERsuggests it means 7 bytes,which is not the reality. The documentation is misleading. 7 pages. But if you write '700kB' it'll be taken as bytes (with 8kB granularity). shared_buffers also is computed based on page-size and documented in bytes. Regards, Andres -- Sent via pgsql-bugs mailing list (pgsql-bugs@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-bugs