Re: file cloning in pg_upgrade and CREATE DATABASE

On 3/21/18 22:38, Michael Paquier wrote:
> At least on Linux it is possible to rely on sync_file_range which is
> called via pg_flush_data, so it seems to me that we ought to roughly
> keep the loop working on FLUSH_DISTANCE, and replace the calls of
> read/write by copy_file_range.  copyfile is only able to do a complete
> file copy, so we would also lose this property as well on Linux.

I have shown earlier in the thread that copy_file_range in one go is
still better than doing it in pieces.

-- 
Peter Eisentraut              http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services