Обсуждение: Where in the source code does postgres write to disk?

On Fri, Apr 19, 2013 at 11:26 PM, Mike Levine <michael.levine@yale.edu> wrote:
> According to
> http://www.postgresql.org/docs/9.2/static/storage-file-layout.html
>
> "When a table or index exceeds 1 GB, it is divided into gigabyte-sized
> segments. The first segment's file name is the same as the filenode;
> subsequent segments are named filenode.1, filenode.2, etc."
>
> I was wondering where in the source code this is dealt with. I have been
> searching for the last few hours but have had no luck
>
>
> Any help guiding me to the location in the source code where postgres writes
> the buffer to disk would be greatly appreciated.

postgres disk writing mostly happens in md.c.  reason why you probably
had trouble finding it is that disk i/o (as with memory allocation) is
hidden behind a function pointer interface.

merlin