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While ereport() and elog() themselves are quite cheap when the error message level is too low to be printed, some places need to do substantial work before they can call those macros at all. To allow optimizing away such setup work when nothing is to be printed, make elog.c export a new function message_level_is_interesting(elevel) that reports whether ereport/elog will do anything. Make use of that in various places that had ad-hoc direct tests of log_min_messages etc. Also teach ProcSleep to use it to avoid some work. (There may well be other places that could usefully use this; I didn't search hard.) Within elog.c, refactor a little bit to avoid having duplicate copies of the policy-setting logic. When that code was written, we weren't relying on the availability of inline functions; so it had some duplications in the name of efficiency, which I got rid of. Alvaro Herrera and Tom Lane Discussion: https://postgr.es/m/129515.1606166429@sss.pgh.pa.us
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/.