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Enable IO concurrency on all systems

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Previously effective_io_concurrency and maintenance_io_concurrency could not
be set above 0 on machines without fadvise support. AIO enables IO concurrency
without such support, via io_method=worker.

Currently only subsystems using the read stream API will take advantage of
this. Other users of maintenance_io_concurrency (like recovery prefetching)
which leverage OS advice directly will not benefit from this change. In those
cases, maintenance_io_concurrency will have no effect on I/O behavior.

Author: Melanie Plageman <melanieplageman@gmail.com>
Reviewed-by: Noah Misch <noah@leadboat.com>
Discussion: https://postgr.es/m/CAAKRu_atGgZePo=_g6T3cNtfMf0QxpvoUh5OUqa_cnPdhLd=gw@mail.gmail.com
This commit is contained in:
Andres Freund
2025-03-30 19:14:55 -04:00
parent ae3df4b341
commit 2a5e709e72
10 changed files with 14 additions and 67 deletions
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4
src/backend/utils/misc/postgresql.conf.sample
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@ -198,8 +198,8 @@
# - I/O -
#backend_flush_after = 0 # measured in pages, 0 disables
#effective_io_concurrency = 16 # 1-1000; 0 disables prefetching
#maintenance_io_concurrency = 16 # 1-1000; 0 disables prefetching
#effective_io_concurrency = 16 # 1-1000; 0 disables issuing multiple simultaneous IO requests
#maintenance_io_concurrency = 16 # 1-1000; same as effective_io_concurrency
#io_max_combine_limit = 128kB # usually 1-128 blocks (depends on OS)
# (change requires restart)
#io_combine_limit = 128kB # usually 1-128 blocks (depends on OS)