We're building a few tools to test various new filesystems + fileservers against. We thought we'd put them out there, partially in case anyone else finds them useful, but mostly in the hope that someone will come along and say "You idiots! You're doing it all wrong! And besides, the perfect tool for this already exists, it has done since the 70s, here's a link".
Or something. Contributions and suggestions welcome.
The PythonAnywhere gang
There is one tool called "multiprocess-reader-writer", which spaws lots of processes that read and write to a given directory. Some parameters in the command-line, some as constants in the file.