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The point of this loop is to insert 1000 rows into the test table and consume 1000 XIDs. I can't see any good reason why it's useful to launch 1000 psqls and 1000 backend processes to accomplish that. Pushing the looping into a plpgsql DO block shaves about 10 seconds off the runtime of the src/test/recovery TAP tests on my machine; that's over 10% of the runtime of that test suite. It is, in fact, sufficiently more efficient that we now demonstrably need wait_slot_xmins() afterwards, or the slaves' xmins may not have moved yet. |
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README.git |
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/.