3d48654017
The regexes used in 102_vacuumdb_stages.pl to check the postmaster log for expected output contained several places with ".*.*", which is underdetermined and can cause exponential runtime growth in Perl's regex matcher (since it's not bright enough not to waste time seeing whether different splits of the same substring would allow a match). We were fortunate that the amount of text in the postmaster log was generally not enough to make the runtime go to the moon; although commit 6271fceb8 had been on the hairy edge of an obvious problem, thanks to its increasing the default log verbosity to DEBUG1. Experimentation shows that anyone who tried to run this test case with an even higher log verbosity would have been in for serious pain. But even at default logging level, fixing this saves several hundred ms on my workstation, more on slower buildfarm members. Remove the extra ".*"s, restoring more-or-less-linear matching speed. Back-patch to 9.4 where the test case was added, mostly in case anyone tries to do related debugging in a back branch. Discussion: https://postgr.es/m/32459.1525657786@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/.