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Thank you very much for sharing this, very insightful.

• ryao 2y ago
  Thank you for posting your original comment. The process of writing my reply gave me a flash of inspiration: https://github.com/openzfs/zfs/pull/16896 https://github.com/openzfs/zfs/pull/16896 I doubt that this will make us as fast as ext4 at unlinking files in a single thread, but it should narrow the gap somewhat. It also should make many other common operations slightly faster. I had looked into range lock overhead years ago, but when I saw the majority of time entering range locks was spent in an “unavoidable” memory allocation, I did not feel that making the operations outside the memory allocation faster would make much difference, so I put this down. I imagine many others profiling the code came to the same conclusion. Now that the memory allocation overhead will soon be gone, additional profiling might yield further improvements. :)