Salvatore Dipietro of Amazon/AWS reported a throughput and latency regression for PostgreSQL. They found Linux 7.0 in its near-final form delivering around 0.51x the throughputof prior kernels on a Graviton4 server due to now much more time being spent in a user-space spinlock.
AWS Engineer Reports PostgreSQL Performance Halved By Linux 7.0, But A Fix May Not Be Easy
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Nik and Michael are joined by Bruce Momjian to discuss his new talk "What’s Missing in Postgres?" Here are some links to things they mentioned: Bruce Momjian https://postgres.fm/people/bruce-momjianEDB https://www.enterprisedb.comWhat’s Missing in Postgres? (Bruce’s slides)...
#PostgreSQL has relied on the OS to handle text sorting for most of its history. When glibc 2.28 shipped in 2018 with a major Unicode collation overhaul, every existing text index built under the old rules became invalid... but without warnings or errors.
#Postgres 17 added a builtin locale provider that removes the external dependency entirely:
initdb --locale-provider=builtin --locale=C.UTF-8
More details in this week's PG Phriday: https://www.pgedge.com/blog/what-is-a-collation-and-why-is-my-data-corrupt
The GNU C Library (glibc) version 2.28 entered the world on August 1st, 2018 and Postgres hasn't been the same since. Among its many changes was a massive update to locale collation data, bringing it in line with the 2016 Edition 4 release of the ISO 14651 standard and Unicode 9.0.0. This was not a subtle tweak. It was the culmination of roughly 18 years of accumulated locale modifications, all merged in a single release.
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