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The previous coding would allow requests up to half of maxBlockSize to be treated as "chunks", but when that actually did happen, we'd waste nearly half of the space in the malloc block containing the chunk, if no smaller requests came along to fill it. Avoid this scenario by limiting the maximum size of a chunk to 1/8th maxBlockSize, so that we can waste no more than 1/8th of the allocated space. This will not change the behavior at all for the default context size parameters (with large maxBlockSize), but it will change the behavior when using ALLOCSET_SMALL_MAXSIZE. In particular, there's no longer a need for spell.c to be overly concerned about the request size parameters it uses, so remove a rather unhelpful comment about that. Merlin Moncure, per an idea of Tom Lane's |
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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: http://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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.