1a3458b6d8
This patch adds an option, huge_tlb_pages, which allows requesting the shared memory segment to be allocated using huge pages, by using the MAP_HUGETLB flag in mmap(). This can improve performance. The default is 'try', which means that we will attempt using huge pages, and fall back to non-huge pages if it doesn't work. Currently, only Linux has MAP_HUGETLB. On other platforms, the default 'try' behaves the same as 'off'. In the passing, don't try to round the mmap() size to a multiple of pagesize. mmap() doesn't require that, and there's no particular reason for PostgreSQL to do that either. When using MAP_HUGETLB, however, round the request size up to nearest 2MB boundary. This is to work around a bug in some Linux kernel versions, but also to avoid wasting memory, because the kernel will round the size up anyway. Many people were involved in writing this patch, including Christian Kruse, Richard Poole, Abhijit Menon-Sen, reviewed by Peter Geoghegan, Andres Freund and me. |
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| README.git | ||
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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: 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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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/.