| From: | Florian Weimer <fweimer(at)bfk(dot)de> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Jim Nasby <jim(at)nasby(dot)net>, Jeff Davis <pgsql(at)j-davis(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: crash-safe visibility map, take three |
| Date: | 2010-12-03 14:25:20 |
| Message-ID: | 82oc93q6gf.fsf@mid.bfk.de |
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| Lists: | pgsql-hackers |
* Robert Haas:
> Those hint bit tests are a single machine instruction. It's tough
> to beat that. It's tough to get within two orders of magnitude.
> I'd like to, but I don't see how.
For some scans, it might be possible to hoist the checks out of inner
loops. (At least in principle, I'm not sure how much that would
interfere with the executor architecture.)
--
Florian Weimer <fweimer(at)bfk(dot)de>
BFK edv-consulting GmbH http://www.bfk.de/
Kriegsstraße 100 tel: +49-721-96201-1
D-76133 Karlsruhe fax: +49-721-96201-99
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