1213cb4753
The parallel GIN builds perform "freezing" of TID lists when merging chunks built earlier. This means determining what part of the list can no longer change, depending on the last received chunk. The frozen part can be evicted from memory and written out. The code attempted to freeze items right before merging the old and new TID list, after already attempting to trim the current buffer. That means part of the data may get frozen based on the new TID list, but will be trimmed later (on next loop). This increases memory usage. This inverts the order, so that we freeze data first (before trimming). The benefits are likely relatively small, but it's also virtually free with no other downsides. Discussion: https://postgr.es/m/CAHLJuCWDwn-PE2BMZE4Kux7x5wWt_6RoWtA0mUQffEDLeZ6sfA@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/.