On Thu, 7 Aug 2008, Cyril SCETBON wrote:
What's the way to count the read/write bytes of the checkpoint process before 8.3 (no pg_stat_bgwriter view :-[ ) I want to distinguish bytes written by checkpoints and others written by the background process
The reason that view was added was because it's really hard to figure that out in earlier versions. Theoretically you could have some operating system level program that tracked I/O on a per-process basis, noting which one was the background writer process and counting those separately. I found it easier to work on adding the counters instead.
It's not really complete, but I did have a functional prototype of a pg_stat_bgwriter implementation that worked against 8.2 if that helps you any: http://www.westnet.com/~gsmith/content/postgresql/perfmon82.htm
-- * Greg Smith gsmith@xxxxxxxxxxxxx http://www.gregsmith.com Baltimore, MD
