| From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
|---|---|
| To: | Merlin Moncure <mmoncure(at)gmail(dot)com> |
| Cc: | Jeff Davis <pgsql(at)j-davis(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Atri Sharma <atri(dot)jiit(at)gmail(dot)com> |
| Subject: | Re: WIP patch for hint bit i/o mitigation |
| Date: | 2012-11-28 21:07:50 |
| Message-ID: | 20121128210749.GE4333@alvh.no-ip.org |
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| Lists: | pgsql-hackers |
Merlin Moncure escribió:
> Maybe abstracting 'last xid cache' along with hint bit management out
> of both transam.c and tqual.c into something like 'hints.c' is
> appropriate, but that's a more invasive change.
It would be good to have such a patch to measure/compare performance of
both approaches. It does seem like the more invasive change might be
more expensive for both the transam.c and the tqual.c uses, though; and
it's not clear that there's anything to be gained by having them be
together in a single module.
--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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