bfa3c4f106
This commit refactors hashbulkdelete() to use streaming reads, improving
the efficiency of the operation by prefetching upcoming buckets while
processing a current bucket. There are some specific changes required
to make sure that the cleanup work happens in accordance to the data
pushed to the stream read callback. When the cached metadata page is
refreshed to be able to process the next set of buckets, the stream is
reset and the data fed to the stream read callback has to be updated.
The reset needs to happen in two code paths, when _hash_getcachedmetap()
is called.
The author has seen better performance numbers than myself on this one
(with tweaks similar to 6c228755ad). The numbers are good enough for
both of us that this change is worth doing, in terms of IO and runtime.
Author: Xuneng Zhou <xunengzhou@gmail.com>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Reviewed-by: Nazir Bilal Yavuz <byavuz81@gmail.com>
Discussion: https://postgr.es/m/CABPTF7VrqfbcDXqGrdLQ2xaQ=K0RzExNuw6U_GGqzSJu32wfdQ@mail.gmail.com
PostgreSQL Database Management System
This directory contains the source code distribution of the PostgreSQL database management system.
PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.