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aio: Add io_method=io_uring

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Performing AIO using io_uring can be considerably faster than
io_method=worker, particularly when lots of small IOs are issued, as
a) the context-switch overhead for worker based AIO becomes more significant
b) the number of IO workers can become limiting

io_uring, however, is linux specific and requires an additional compile-time
dependency (liburing).

This implementation is fairly simple and there are substantial optimization
opportunities.

The description of the existing AIO_IO_COMPLETION wait event is updated to
make the difference between it and the new AIO_IO_URING_EXECUTION clearer.

Reviewed-by: Noah Misch <noah@leadboat.com>
Reviewed-by: Jakub Wartak <jakub.wartak@enterprisedb.com>
Discussion: https://postgr.es/m/uvrtrknj4kdytuboidbhwclo4gxhswwcpgadptsjvjqcluzmah%40brqs62irg4dt
Discussion: https://postgr.es/m/20210223100344.llw5an2aklengrmn@alap3.anarazel.de
Discussion: https://postgr.es/m/stj36ea6yyhoxtqkhpieia2z4krnam7qyetc57rfezgk4zgapf@gcnactj4z56m
This commit is contained in:
Andres Freund
2025-03-18 14:40:05 -04:00
parent 8eadd5c73c
commit c325a7633f
14 changed files with 589 additions and 2 deletions
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4
src/backend/utils/activity/wait_event_names.txt
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@@ -192,7 +192,9 @@ ABI_compatibility:
Section: ClassName - WaitEventIO
AIO_IO_COMPLETION "Waiting for IO completion."
AIO_IO_COMPLETION "Waiting for another process to complete IO."
AIO_IO_URING_SUBMIT "Waiting for IO submission via io_uring."
AIO_IO_URING_EXECUTION "Waiting for IO execution via io_uring."
BASEBACKUP_READ "Waiting for base backup to read from a file."
BASEBACKUP_SYNC "Waiting for data written by a base backup to reach durable storage."
BASEBACKUP_WRITE "Waiting for base backup to write to a file."

3
src/backend/utils/misc/postgresql.conf.sample
View File

@@ -204,7 +204,8 @@
# (change requires restart)
#io_combine_limit = 128kB # usually 1-128 blocks (depends on OS)
#io_method = worker # worker, sync (change requires restart)
#io_method = worker # worker, io_uring, sync
# (change requires restart)
#io_max_concurrency = -1 # Max number of IOs that one process
# can execute simultaneously
# -1 sets based on shared_buffers