Wiki / Configuration Parameters
io_max_concurrency
Controls the maximum number of I/O operations that one process can execute simultaneously. The default setting of -1 selects a number based on shared_buffers and the maximum number of processes (max_connections, autovacuum_worker_slots, max_worker_processes and max_wal_senders), but not more than 64. This parameter can only be set at server start.
English manual coverage begins with PostgreSQL 7.4. Source history and runtime observations have their own recorded version boundaries.
Reading PG 18·Select a recorded version
- boot val
- -1
- category
- Resource Usage / I/O
- context
- postmaster
- documented
- true
- enumvals
- Unknown
- extra desc
- Unknown
- lang
- en
- max val
- 1024
- metadata version
- 18
- min val
- -1
- name
- io_max_concurrency
- short desc
- Max number of IOs that one process can execute simultaneously.
- source
- pg-settings-source-snapshot
- unit
- Unknown
- vartype
- integer
Definition PG 18
Controls the maximum number of I/O operations that one process can execute simultaneously. The default setting of -1 selects a number based on shared_buffers and the maximum number of processes (max_connections, autovacuum_worker_slots, max_worker_processes and max_wal_senders), but not more than 64. This parameter can only be set at server start.
Compare versions
Source references
Full definition and evidence JSON
Definition sources
center · PostgreSQL 18 · wiki-repair-20261023:fa313c2652d076bcb1c4024e3614b58c5c449ead9f7044052831d552f984226e
Text language: en · wiki-repair-20261023:fa313c2652d076bcb1c4024e3614b58c5c449ead9f7044052831d552f984226e