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Prior to the introduction of the compression API in e9960732a9, pg_dump would use the ZLIB_IN_SIZE/ZLIB_OUT_SIZE to size input/output buffers. Commit 0da243fed0 introduced similar constants for LZ4, but while gzip defined both buffers to be 4kB, LZ4 used 4kB and 16kB without any clear reasoning why that's desirable. Furthermore, parts of the code unaware of which compression is used (e.g. pg_backup_directory.c) continued to use ZLIB_OUT_SIZE directly. Simplify by replacing the various constants with DEFAULT_IO_BUFFER_SIZE, set to 4kB. The compression implementations still have an option to use a custom value, but considering 4kB was fine for 20+ years, I find that unlikely (and we'd probably just increase the default buffer size). Author: Georgios Kokolatos Reviewed-by: Tomas Vondra, Justin Pryzby Discussion: https://postgr.es/m/33496f7c-3449-1426-d568-63f6bca2ac1f@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. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.