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> not sure why all the existing crates have gone so far out of date.

Pure speculation on my part: maybe people are choosing Rust-based embedded key value stores like sled or redb?

Only slightly off topic, but any of these support fast concurrent writes? LMDB really slows down for me when I'm trying to write a lot to it and locking means i cant use concurrency to speed it up.

Batching helps, and if you can avoid syncing after every write that helps too. In practice I get great throughout, but then I’m OK with losing a small amount of data if my server dies during writes, as long as that doesn’t lead to corruption, which it doesn’t with MDB_NOSYNC and kernel guided fsyncing

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