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In our B-tree implementation appropriate leaf page for new tuple insertion is acquired using _bt_search() function. This function always returns leaf page locked in shared mode. In order to obtain exclusive lock, caller have to relock the page. This commit makes _bt_search() function lock leaf page immediately in exclusive mode when needed. That removes unnecessary relock and, in turn reduces lock contention for B-tree leaf pages. Our experiments on multi-core systems showed acceleration up to 4.5 times in corner case. Discussion: https://postgr.es/m/CAPpHfduAMDFMNYTCN7VMBsFg_hsf0GqiqXnt%2BbSeaJworwFoig%40mail.gmail.com Author: Alexander Korotkov Reviewed-by: Yoshikazu Imai, Simon Riggs, Peter Geoghegan
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/.