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Andres Freund: The path to using AIO in postgres (PGConf.EU 2023)
Discover the benefits of using Asynchronous I/O (AIO) in PostgreSQL, including improved performance, scalability, and practical applications in sequential scans, vacuuming, and crash recovery.
- Asynchronous I/O (AIO) in Postgres is beneficial, especially for large shared buffers.
- Direct AIO is required for wall writes, as the operating system’s buffer management is not suitable.
- AO in POSIX provides a standardized way to do asynchronous I/O.
- Using AIO for sequential scans can lead to significant performance improvements.
- Vacuuming and crash recovery can also benefit from AIO.
- AO in PostgreSQL is a project that has been ongoing for a few years.
- The developer has been working on it since 2015, and it’s mostly complete.
- There are many benefits to using AIO, such as increased performance and scalability.
- The biggest issue is that the operating system does not have a good implementation of AO.
- Direct AIO can be much faster than buffered AIO, especially for sequential scans.
- The developer is planning to add more features to PostgreSQL to support AIO.
- There are no specific constraints or prerequisites to using AO in PostgreSQL, but developers should consider the size of shared buffers and the type of workload.
- AO in PostgreSQL is currently mostly done using the streaming interface.
- The developer has been working with several colleagues on this project, and it is mostly complete.
- The main issues with AIO are the operating system’s buffer management and the limited write concurrency.
- AO is planned to be used in many areas of PostgreSQL, including sequential scans, vacuuming, and crash recovery.
- The developer is planning to add more features to support AO, such as relation extension and bulk modification.