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Benchmarking has shown that the current number of clog buffers limits scalability. We've previously increased the number in 33aaa139, but that's not sufficient with a large number of clients. We've benchmarked the cost of increasing the limit by benchmarking worst case scenarios; testing showed that 128 buffers don't cause a regression, even in contrived scenarios, whereas 256 does There are a number of more complex patches flying around to address various clog scalability problems, but this is simple enough that we can get it into 9.6; and is beneficial even after those patches have been applied. It is a bit unsatisfactory to increase this in small steps every few releases, but a better solution seems to require a rewrite of slru.c; not something done quickly. Author: Amit Kapila and Andres Freund Discussion: CAA4eK1+-=18HOrdqtLXqOMwZDbC_15WTyHiFruz7BvVArZPaAw@mail.gmail.com
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: http://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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.