It's been over two years(!) since the last release of the #IOR and #mdtest #HPC I/O benchmarks, so we just cut a candidate for 4.0.0 based on the version used for the #SC22 #IO500 here: https://github.com/hpc/ior/releases/tag/4.0.0rc1

PLEASE kick the tires since there have been huge changes since 3.3.0 came out.