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| author | Stephen Frost <sfrost@snowman.net> | 2021-03-16 14:46:48 -0400 |
|---|---|---|
| committer | Stephen Frost <sfrost@snowman.net> | 2021-03-16 14:46:48 -0400 |
| commit | c6fc50cb40285141fad401321ae21becbaea1c59 (patch) | |
| tree | bd46171aa6e6880f86fc8f977891bdff933149d7 /src/backend/executor/nodeHash.c | |
| parent | 94d13d474dc61800e8a17cc1959c55815b050ecd (diff) | |
| download | postgresql-c6fc50cb40285141fad401321ae21becbaea1c59.tar.gz postgresql-c6fc50cb40285141fad401321ae21becbaea1c59.zip | |
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
Diffstat (limited to 'src/backend/executor/nodeHash.c')
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