PostgreSQL14previewanalyze支持prefetch加速IO(maintenance_io_concurrency)

作者

digoal

日期

2021-03-17

标签

PostgreSQL , analyze , prefetch

背景

https://git.postgresql.org/gitweb/?p=postgresql.git;a=commit;h=c6fc50cb40285141fad401321ae21becbaea1c59

```

Use pre-fetching for ANALYZE

author Stephen Frost &＃115;&＃102;&＃114;&＃111;&＃115;&＃116;&＃64;&＃115;&＃110;&＃111;&＃119;&＃109;&＃97;&＃110;&＃46;&＃110;&＃101;&＃116;

Tue, 16 Mar 2021 18:46:48 +0000 (14:46 -0400)

committer Stephen Frost &＃115;&＃102;&＃114;&＃111;&＃115;&＃116;&＃64;&＃115;&＃110;&＃111;&＃119;&＃109;&＃97;&＃110;&＃46;&＃110;&＃101;&＃116;

Tue, 16 Mar 2021 18:46:48 +0000 (14:46 -0400)

commit c6fc50cb40285141fad401321ae21becbaea1c59

tree bd46171aa6e6880f86fc8f977891bdff933149d7 tree

parent 94d13d474dc61800e8a17cc1959c55815b050ecd commit | diff

Use pre-fetching for ANALYZE

When we have posix_fadvise() available, we can improve the performance

of an ANALYZE by quite a bit by using it to inform the kernel of the

blocks that we're going to be asking for. Similar to bitmap index

scans, the number of buffers pre-fetched is based off of the

maintenance_io_concurrency setting (for the particular tablespace or,

if not set, globally, via get_tablespace_maintenance_io_concurrency()).

Reviewed-By: Heikki Linnakangas, Tomas Vondra

Discussion: https://www.postgresql.org/message-id/VI1PR0701MB69603A433348EDCF783C6ECBF6EF0%40VI1PR0701MB6960.eurprd07.prod.outlook.com

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