Asynchronous I/O (AIO)
Recorded source states and original language descriptions. Missing version evidence stays unknown.
The source snapshot records transitions for PostgreSQL 8.1–18. The historical matrix records independent cells for 7.4–18. Neither records support for PostgreSQL 19 or 20; newer versions remain unknown. These source claims are distinct from runtime measurements.
Performance
Description
New I/O subsystem PostgreSQL issue multiple I/O requests concurrently instead of waiting for each to finish in sequence. This expands existing readahead and improves overall throughput. AIO supported in PostgreSQL 18 include sequential scans, bitmap heap scans, and vacuum. For more information see io_method.
Selected version: PostgreSQL 18
Yes
Compare versions
Original documentation links
Complete source facts and provenance
yaml · center · 1dd22bf9a7f3ec325b894e2836fda535a25529f246a94dd41d6abbfe9997f7fd
{
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"SourceKey": "Asynchronous I/O (AIO)",
"SourceHash": "1dd22bf9a7f3ec325b894e2836fda535a25529f246a94dd41d6abbfe9997f7fd",
"Name": "Asynchronous I/O (AIO)",
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"name": "Asynchronous I/O (AIO)",
"versions": {
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}
},
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"versions": {
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}
},
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{
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{
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{
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},
{
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},
{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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},
{
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}
],
"Texts": [
{
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"Title": "Asynchronous I/O (AIO)",
"BodyHTML": "\u003cp\u003eNew I/O subsystem PostgreSQL issue multiple I/O requests concurrently instead of waiting for each to finish in sequence. This expands existing readahead and improves overall throughput. AIO supported in PostgreSQL 18 include sequential scans, bitmap heap scans, and vacuum. For more information see \u003ca href=\"https://www.postgresql.org/docs/18/runtime-config-resource.html#GUC-IO-METHOD\" rel=\"nofollow\"\u003e\u003ccode\u003eio_method\u003c/code\u003e\u003c/a\u003e.\u003c/p\u003e\n",
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"name": "Asynchronous I/O (AIO)",
"versions": {
"18": "Yes"
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{
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"Title": "异步 I/O (AIO)",
"BodyHTML": "\u003cp\u003e新的 I/O 子系统允许 PostgreSQL 并发发出多个 I/O 请求，而不必顺序等待每个请求完成，从而扩展预读并提升 I/O 吞吐。\u003c/p\u003e\n",
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"name": "异步 I/O (AIO)"
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],
"GroupTitles": {
"en": "Performance",
"zh-Hans": "性能"
}
}