Re: Review: DTrace probes (merged version) ver_03

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