681daed931
Allows collecting details about AIO / prefetch for scan nodes backed by a ReadStream. This may be enabled by a new "IO" option in EXPLAIN, and it shows information about the prefetch distance and I/O requests. As of this commit this applies only to BitmapHeapScan, because that's the only scan node using a ReadStream and collecting instrumentation from workers in a parallel query. Support for SeqScan and TidRangeScan, the other scan nodes using ReadStream, will be added in subsequent commits. The stats are collected only when required by EXPLAIN ANALYZE, with the IO option (disabled by default). The amount of collected statistics is very limited, but we don't want to clutter EXPLAIN with too much data. The IOStats struct is stored in the scan descriptor as a field, next to other fields used by table AMs. A pointer to the field is passed to the ReadStream, and updated directly. It's the responsibility of the table AM to allocate the struct (e.g. in ambeginscan) whenever the flag SO_SCAN_INSTRUMENT flag is passed to the scan, so that the executor and ReadStream has access to it. The collected stats are designed for ReadStream, but are meant to be reasonably generic in case a TAM manages I/Os in different ways. Author: Tomas Vondra <tomas@vondra.me> Reviewed-by: Melanie Plageman <melanieplageman@gmail.com> Reviewed-by: Lukas Fittl <lukas@fittl.com> Reviewed-by: Andres Freund <andres@anarazel.de> Discussion: https://postgr.es/m/flat/a177a6dd-240b-455a-8f25-aca0b1c08c6e%40vondra.me |
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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.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.