| From: | Greg Smith <gsmith(at)gregsmith(dot)com> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
| Cc: | Robert Lor <Robert(dot)Lor(at)Sun(dot)COM>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Zdenek Kotala <Zdenek(dot)Kotala(at)Sun(dot)COM>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Robert Treat <xzilla(at)users(dot)sourceforge(dot)net>, jesus(at)omniti(dot)com |
| Subject: | Re: Review: DTrace probes (merged version) ver_03 |
| Date: | 2008-08-02 20:00:51 |
| Message-ID: | Pine.GSO.4.64.0808021554140.12209@westnet.com |
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| Lists: | pgsql-hackers |
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(at)gregsmith(dot)com http://www.gregsmith.com Baltimore, MD
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