A collection of the most of the well known single-threaded (or very poorly threaded) benchmarks available via the Phoronix Test Suite.
Phoronix Test Suite. It's as easy as running the phoronix-test-suite benchmark single-threaded command..
pts/single-threaded-1.0.0 08 Apr 2020 12:21 EDT
Add known single-threaded tests to this test suite to complement the multicore test suite.