> CouchDB is smart enough to collect writes from multiple concurrent clients into a "group commit" and
> issue only one fsync to durably store all of them in one go.  It's a bit like generating a _bulk_docs request under the hood.
> That's the main reason you see the jump from 10/sec to 300/sec.

Hmm... sounds reasonable.
Thank you.

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Konstantin Cherkasoff