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The pgbench regression test supposed that srandom() with a specific value would result in deterministic output from random(), as required by POSIX. It emerges however that OpenBSD is too smart to be constrained by mere standards, so their random() emits nondeterministic output anyway. While a workaround does exist, what seems like a better fix is to stop relying on the platform's srandom()/random() altogether, so that what you get from --random-seed=N is not merely deterministic but platform independent. Hence, use a separate pg_jrand48() random sequence in place of random(). Also adjust the regression test case that's supposed to detect nondeterminism so that it's more likely to detect it; the original choice of random_zipfian parameter tended to produce the same output all the time even if the underlying behavior wasn't deterministic. In passing, improve pgbench's docs about random_zipfian(). Back-patch to v11 where this code was introduced. Fabien Coelho and Tom Lane Discussion: https://postgr.es/m/4615.1547792324@sss.pgh.pa.us |
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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: 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/.