Melanie Plageman ff79b5b2ab Increase default effective_io_concurrency to 16 ... The default effective_io_concurrency has been 1 since it was introduced in b7b8f0b609. Referencing the associated discussion [1], it seems 1 was chosen as a conservative value that seemed unlikely to cause regressions. Experimentation on high latency cloud storage as well as fast, local nvme storage (see Discussion link) shows that even slightly higher values improve query timings substantially. 1 actually performs worse than 0 [2]. With effective_io_concurrency 1, we are not prefetching enough to avoid I/O stalls, but we are issuing extra syscalls. The new default is 16, which should be more appropriate for common hardware while still avoiding flooding low IOPs devices with I/O requests. [1] https://www.postgresql.org/message-id/flat/FDDBA24E-FF4D-4654-BA75-692B3BA71B97%40enterprisedb.com [2] https://www.postgresql.org/message-id/CAAKRu_Zv08Cic%3DqdCfzrQabpEXGrd9Z9UOW5svEVkCM6%3DFXA9g%40mail.gmail.com Reviewed-by: Andres Freund <andres@anarazel.de> Discussion: https://postgr.es/m/CAAKRu_Z%2BJa-mwXebOoOERMMUMvJeRhzTjad4dSThxG0JLXESxw%40mail.gmail.com		2025-03-12 15:57:44 -04:00
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backend	Increase default effective_io_concurrency to 16	2025-03-12 15:57:44 -04:00
bin	Don't convert to and from floats in pg_dump.	2025-03-08 11:25:36 -08:00
common	Change relpath() et al to return path by value	2025-02-25 09:02:07 -05:00
fe_utils	Get rid of O(N^2) script-parsing overhead in pgbench.	2025-02-27 10:53:38 -05:00
include	Increase default effective_io_concurrency to 16	2025-03-12 15:57:44 -04:00
interfaces	Update nls.mk for newly added file	2025-03-11 13:48:14 +01:00
makefiles	Add support for OAUTHBEARER SASL mechanism	2025-02-20 16:25:17 +01:00
pl	Prepare for Python "Limited API" in PL/Python	2025-03-12 08:53:54 +01:00
port	Assert that wrapper_handler()'s argument is within expected range.	2025-03-07 15:23:09 -06:00
template	thread-safety: gmtime_r(), localtime_r()	2024-08-23 07:43:04 +02:00
test	Build whole-row Vars the same way during parsing and planning.	2025-03-12 11:47:38 -04:00
timezone	Update time zone data files to tzdata release 2025a.	2025-01-20 16:49:15 -05:00
tools	Add connection establishment duration logging	2025-03-12 11:35:27 -04:00
tutorial	Doc: simplify the tutorial's window-function examples.	2025-01-21 14:43:21 -05:00
.gitignore
DEVELOPERS
Makefile	Remove distprep	2023-11-06 15:18:04 +01:00
Makefile.global.in	Add support for OAUTHBEARER SASL mechanism	2025-02-20 16:25:17 +01:00
Makefile.shlib	Remove AIX support	2024-02-28 15:17:23 +04:00
meson.build	Update copyright for 2025	2025-01-01 11:21:55 -05:00
nls-global.mk	Remove distprep	2023-11-06 15:18:04 +01:00