my benchmark script ☞ http://gist.github.com/268512, couchdb is 5x(read)~10x(write) slower than mongodb :(
I think the conclusion is wrong as it is based on comparing the real-time figures (wall time elapsed between invocation and termination). I’d say comparing total times (user + sys) would be more correct.
Update: @codemonkeyism has pointed out yet another reason for this benchmark being wrong:
“As far as I know CouchDB data is durable, but MongoDB is primarily memory and then stored and corruptable - are those comparable?”.