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Since gtrgm_penalty() is usually called many times in a row with the same "newval" (to determine which item on an index page newval fits into best), the makesign() calculation is repetitious. It's expensive enough to make it worth caching the result, so do so. On my machine this is good for more than a 40% savings in the time needed to build a trigram index on /usr/share/dict/words. This is all per a suggestion of Heikki's. In passing, make some mostly-cosmetic improvements in the caching logic in the other functions in this file that rely on caching info in fn_extra.
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/.