May turn useful, or not.
This is mostly a testbed for a few containers, especially hashmap.zig which ended up in the standard library.
A couple benchmarks are available (and can be tinkered with):
zig build bench -Drelease-fast
and more interestingly, a simplified implementation in Zig of this one which ended up in gotta go fast.
zig build martinus -Drelease-fast
The martinus benchmark directly uses the standard library’s hashmap, and supports -Doverride-lib-dir=path/to/lib for in-place testing.