On Fri, 1 Aug 2008, Alvaro Herrera wrote:
> Sounds like the thing to do would be to pass CheckpointStats into the
> DONE probe.
I thought it would be more useful to demarcate where the two phases of the
checkpoint process were at clearly--the actual times themselves are
helpful but dtrace can do more than that. The write and sync phases have
very different I/O characteristics, and it really should be easy for
people to analyze them independantly. I'm not familiar enough with dtrace
to know if that's easy with the patch as it stands, I think there needs to
be another probe in the middle there to make that straightforward.
--
* Greg Smith gsmith@gregsmith.com http://www.gregsmith.com Baltimore, MD