gh-108416: Mark slow test methods with @requires_resource('cpu') (GH-108421)
Only mark tests which spend significant system or user time,
by itself or in subprocesses.
(cherry picked from commit f3ba0a74cd)
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
Also while there, clarify a few things about why we reduce the hash to 32 bits.
Co-authored-by: Eli Libman <eli@hyro.ai>
Co-authored-by: Yury Selivanov <yury@edgedb.com>
Co-authored-by: Łukasz Langa <lukasz@langa.pl>