On 5/28/13 11:36 AM, Greg Smith wrote: > Outside of the run for performance testing, I think it would be good at > this point to validate that there is really a 16MB file full of zeroes > resulting from these operations. I am not really concerned that > posix_fallocate might be slower in some cases; that seems unlikely. I > am concerned that it might result in a file that isn't structurally the > same as the 16MB of zero writes implementation used now.
I see nothing in the posix_fallocate() man pages that says that the allocated space is filled with any kind of data or zeroes. It will likely be garbage data, but that should be fine for a new WAL file. -- Sent via pgsql-hackers mailing list (firstname.lastname@example.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers