Branko Čibej wrote: > Paul Hammant wrote: >> I still think it would be good for sha1's to be calculated for directories >> *too*. Better still if those obeyed user permissions too. > > Server CPU is a limited resource. File content hashes are not affected > by user permissions, so they can be computed once and reused. A hash of > a user-specific view of directory contents would have to be recalculated > at every access.
It would only have to be recalculated when the user's access has changed. More precisely, when the user's access doesn't match that of any already-cached result. That can be more efficient. And server network IO is a limited resource too. Any server-side calculation required might in any case be preferable to sending all the data out so that each client can calculate the result itself. - Julian
