9ebe1c4f2c
Replace the separate init and max size options with a single size option. We didn't make much use of the feature, all callers except the ones in wait_event.c already used the same size for both, and the hash tables in wait_event.c are small so there's little harm in just allocating them to the max size. The only reason why you might want to not reserve the max size upfront is to make the memory available for other hash tables to grow beyond their max size. Letting hash tables grow much beyond their max size is bad for performance, however, because we cannot resize the directory, and we never had very much "wiggle room" to grow to anyway so you couldn't really rely on it. We recently marked the LOCK and PROCLOCK tables with HAS_FIXED_SIZE, so there's nothing left in core that would benefit from more unallocated shared memory. Reviewed-by: Tomas Vondra <tomas@vondra.me> Discussion: https://www.postgresql.org/message-id/01ab1d41-3eda-4705-8bbd-af898f5007f1@iki.fi
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/.