I wrote about this earlier...
I need in the near future a new file format for our measurement
instruments, and I consider hdf5 and sqlite.
A "must have" for my project is swmr (single writer multiple users) concurrency.
My favorite is hdf5 especially for performance reasons, but the swmr
feature is only announced in older messages for the version 1.10...
and I still don't find any development version in the downloads.
Since last version (3.7) sqlite implements this kind of concurrency
(wal mode), so I'm at a point where I have to reconsider my options...
Is there a more recent estimation about it? Or even better, is it
possible to get a version for testing/evaluating?