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The point of this change is to increase the potential for parallelism while running the core regression tests. Most people these days are using parallel testing modes on multi-core machines, so we might as well try a bit harder to keep multiple cores busy. Hence, a test that runs much longer than others in its parallel group is a candidate to be sub-divided. In this patch, create_index.sql and join.sql are split up. I haven't changed the content of the tests in any way, just moved them. I moved create_index.sql's SP-GiST-related tests into a new script create_index_spgist, and moved its btree multilevel page deletion test over to the existing script btree_index. (btree_index is a more natural home for that test, and it's shorter than others in its parallel group, so this doesn't hurt total runtime of that group.) There might be room for more aggressive splitting of create_index, but this is enough to improve matters considerably. Likewise, I moved join.sql's "exercises for the hash join code" into a new file join_hash. Those exercises contributed three-quarters of the script's runtime. Which might well be excessive ... but for the moment, I'm satisfied with shoving them into a different parallel group, where they can share runtime with the roughly-equally-lengthy gist test. (Note for anybody following along at home: there are interesting interactions between the runtimes of create_index and anything running in parallel with it, because the tests of CREATE INDEX CONCURRENTLY in that file will repeatedly block waiting for concurrent transactions to commit. As committed in this patch, create_index and create_index_spgist have roughly equal runtimes, but that's mostly an artifact of forced synchronization of the CONCURRENTLY tests; when run serially, create_index is much faster. A followup patch will reduce the runtime of create_index_spgist and thereby also create_index.) Discussion: https://postgr.es/m/735.1554935715@sss.pgh.pa.us |
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README
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/.